JP6561558B2 - Telephone system, wireless telephone terminal, and communication system - Google Patents

Description

  The present invention relates to a wireless communication technique, and more particularly, to a synchronization control technique for synchronizing processing operations executed in each terminal based on synchronization pulse signals distributed through a plurality of cascade-connected hubs.

  In a telephone system such as a business phone used in an office, office, or store, a plurality of extensions are connected to a telephone control device (main device) connected to a line from a telephone network via a wired extension transmission line such as a LAN. Telephone terminals are accommodated, and these extension telephone terminals are exchanged and connected to a line by a telephone control device.

  In such a telephone system, as an extension telephone terminal, in addition to a general wired telephone terminal, a wireless telephone terminal in which a wireless slave unit (handset) is wirelessly connected to a wireless master unit (terminal body) connected to an extension transmission path May be accommodated. Since it is assumed that a plurality of these wireless telephone terminals are installed at close positions where the wireless areas overlap each other, each wireless telephone terminal has one carrier (wireless transmission) so as not to compete with other wireless telephone terminals. A time-division wireless system that uses (path) in time division is used.

  As a general wireless system used in a telephone system, there is a DECT (Digital Enhanced Cordless Telecommunications) system (see, for example, Patent Document 1). This DECT system is an autonomous distributed multi-channel access radio system of TDMA (Time Division Multiple Access) -TDD (Time Division Duplex) system.

  Specifically, five carriers are arranged in the 1.9 GHz band, one frame of 10 ms length formed for each carrier is time-divided, and 24 time slots having a length of 416.7 μs are provided as standard. Therefore, in general, a downlink time slot used when wirelessly transmitting from a wireless master unit to a wireless slave unit and an uplink used when transmitting wirelessly from the wireless slave unit to the wireless master unit for one wireless telephone terminal. A time slot pair consisting of time slots is arbitrarily selected from these time slots and assigned as a channel used by the radio telephone terminal.

JP 2001-510972 A JP 2009-077338 A

  When a time division multiple access wireless system represented by the DECT system is used in the telephone system, as described above, each wireless telephone terminal and the wireless master unit are wirelessly connected to the time slot assigned to the wireless system. It is necessary to perform wireless communication with the slave unit. For this reason, in the telephone system, a synchronization pulse signal for time slot synchronization is distributed from the telephone control device to the wireless master unit of each wireless telephone terminal via the extension transmission line, and the wireless master unit uses this synchronization pulse signal as a reference time. As the position, the start timing of its own time slot is specified.

  On the other hand, in the telephone system, when an IP telephone terminal is used as an extension telephone terminal, the telephone control device and each extension telephone terminal are connected by an extension transmission line using a LAN, and power supply to each extension telephone terminal is performed by the PoE method. Power is supplied from a pub (hub) provided in the middle of the extension transmission line based on (IEEE 802.3af). Also, in the telephone system, the power supply line in the LAN cable is used, and the pulse control pulse signal from the telephone controller is repeatedly superimposed on the power supply line in accordance with the frame head timing to synchronize with each wireless telephone terminal. Delivering pulse signals.

  Conventionally, in such a telephone system, hubs are cascade-connected in response to an increase in the number of extension telephone terminals or extension of an extension transmission line (for example, see Patent Document 2). According to such a connection form, the feed line in the LAN cable is terminated at the hub. For this reason, the hub detects the synchronization pulse signal distributed from the power supply line on the telephone control device side, and reproduces and outputs it to the power supply line on the terminal side.

  However, in such a conventional technique, since the synchronization pulse signal is superimposed and distributed on the power supply line in the LAN cable, the propagation time of the synchronization pulse signal is increased in accordance with the extension of the extension transmission line. This causes a delay in the time slot synchronization timing in the telephone terminal. Further, since the sync pulse signal is reproduced and output by the hub, a delay is inevitably caused by the reproduction operation of the sync pulse signal. Therefore, when the number of cascade connection stages of the hub increases, the time required for reproducing the synchronization pulse signal increases, which causes a delay in the time slot synchronization timing in the radio telephone terminal.

  When the time slot synchronization timing in the radio telephone terminal is delayed due to such a delay of the synchronization pulse signal, data transmission is started later than the original time slot assigned to itself. For this reason, data transmission is carried in until the next time slot, interference between these time slots occurs, and this interferes with radio communication in other radio telephone terminals.

  At this time, the delay of the time slot synchronization timing is not a problem as long as it is within a slot deviation allowable range set in the time slot of the wireless system. Therefore, conventionally, in order to suppress the delay of the synchronization pulse signal so as to satisfy this slot deviation allowable range, the number of hubs and extension transmission paths that can be cascade-connected with the telephone control device at the position where the radio telephone terminal is connected It was necessary to limit the track length. For this reason, when installing a radio telephone terminal, there has been a problem that an extension transmission path cannot be freely configured.

  In the above, the problem due to the delay of the time slot synchronization timing has been described by taking the case where a radio system is applied to the telephone system as an example, but the present invention is not limited to this. For example, in the telephone system, when synchronizing processing operations at each extension telephone terminal, such as blinking start / stop operation of incoming LED and ringing tone output start / stop operation at the time of incoming call display, the same sync pulse signal as described above is used. It can also be used. This is because if the operation timing is shifted, the user may feel uncomfortable or uncomfortable.

  At this time, if the extension transmission line is extended or the number of cascade connection stages of the hub is increased due to the system change, the arrival time of the synchronization pulse signal varies depending on the connection position on the extension transmission line. Occurs. For this reason, a difference in operation timing occurs between these extension telephone terminals. In particular, people are sensitive to deviations in visual display and audible display, and even a slight deviation may cause the user to feel uncomfortable or uncomfortable, resulting in a decrease in quality evaluation.

  Such problems are not limited to the telephone system. In a communication system in which a plurality of terminals are connected to a management apparatus via a plurality of cascade-connected hubs, a synchronization pulse signal is distributed from the management apparatus to each terminal via the hub, and each terminal receives the synchronization pulse. Even when the operation timing of each operation is synchronized based on the signal, the same problem as described above occurs.

  The present invention is for solving such problems, and even if the arrival of the synchronization pulse signal varies depending on the number of hubs connected in cascade and the line length of the transmission path, the operation timing is appropriately set in each terminal. The purpose is to provide a synchronization control technology that can be specified in a specific manner.

  In order to achieve such an object, a telephone system according to the present invention includes a plurality of cascade-connected hubs and a plurality of wireless communications based on a time-division multi-dimensional connection method connected via the hubs. A radio telephone terminal and a telephone control device that exchanges and connects these radio telephone terminals to a telephone network, and the telephone control device generates a synchronization pulse signal indicating a reference time position of each time slot used for the radio communication. A telephone system that distributes to each radiotelephone terminal via the hub, and performs radio communication by specifying slot synchronization timing related to a time slot assigned to each radiotelephone terminal based on the synchronization pulse signal The hub confirms each connected device connected to the hub, and notifies the telephone control device of the obtained route information. And a line length measurement unit for measuring the line length between each connected device connected to itself and notifying the obtained telephone length information to the telephone control device, the telephone control device, Based on the route information and the line length information notified from each hub, a terminal delay correction value for correcting the delay time of the synchronization pulse signal in the radio telephone terminal is calculated for each radio telephone terminal. A synchronization control unit for notifying the wireless telephone terminal of the obtained terminal delay correction value, the wireless telephone terminal specifying the slot synchronization timing based on the synchronization pulse signal and the terminal delay correction A timing specifying unit that corrects the slot synchronization timing based on the value is provided.

  Also, one configuration example of the telephone system according to the present invention is a line correction value calculation table showing a correspondence relationship between the line length and a line delay correction value for correcting a delay due to the line length. And a hub delay correction value calculation table showing a correspondence relationship between the number of hub connection stages of the hub and a hub delay correction value for correcting a delay due to these hubs, and the synchronization control unit includes the terminal delay correction value When notifying, based on the line length information and the route information, for each radio telephone terminal, calculate the line length and the hub connection stage number to the radio telephone terminal, and obtained from the line correction value calculation table The terminal delay correction value including a line delay correction value corresponding to the line length and a hub delay correction value corresponding to the number of hub connection stages obtained from the hub delay correction value calculation table. In which it was to be known.

  Also, in one configuration example of the telephone system according to the present invention, the line delay correction value and the hub delay correction value are values obtained by indexing a correction time for correcting a delay. A line correction time calculation table showing a correspondence between the line delay correction value and the actual line correction time; and a hub correction time calculation table showing a correspondence between the hub delay correction value and the actual hub correction time. The timing specifying unit corrects the slot synchronization timing, a line correction time corresponding to the line delay correction value included in the terminal delay correction value obtained from the line correction time calculation table, and the hub correction time. The slot synchronization timing is corrected based on the hub correction time corresponding to the hub delay correction value obtained from the calculation table. That.

In addition, a wireless telephone terminal according to the present invention includes a plurality of cascade-connected hubs, a plurality of wireless telephone terminals that perform wireless communication based on a time-division multidimensional connection method connected through the hubs, and the wireless communication terminals. A telephone control device that exchanges and connects a telephone terminal to a telephone network, and the telephone control device generates a synchronization pulse signal indicating a reference time position of each time slot used for the wireless communication, and passes the hub through the hub. The radiotelephone terminal used in a telephone system that distributes to each radiotelephone terminal and uses each radiotelephone terminal to perform radio communication by specifying slot synchronization timing related to a time slot assigned to each radiotelephone terminal based on the synchronization pulse signal And identifying the slot synchronization timing based on the synchronization pulse signal, and by the telephone control device, Based on the path information and the line length information on the connection equipment of the hub that is notified from the hub, which is notified is computed, the terminal delay correction value for correcting the delay time of the synchronization pulse signal in the radio telephone terminal Based on this, a timing specifying unit for correcting the slot synchronization timing is provided.

  Another telephone system according to the present invention includes a plurality of cascade-connected hubs, a plurality of extension telephone terminals connected via the hubs, and a telephone control device that exchanges and connects these extension telephone terminals to a telephone network. And the telephone control device generates a synchronization pulse signal for synchronizing a specific processing operation executed by each extension telephone terminal between the extension telephone terminals, and the extension via the hub. A telephone system that distributes to a telephone terminal, and each of the extension telephone terminals synchronizes the operation timing of the processing operation based on the synchronization pulse signal, and the hub confirms each connected device connected to itself. Then, the line length information obtained by measuring the line length between the route confirmation unit for notifying the obtained route information to the telephone control device and each connected device connected to itself is obtained. A line length measuring unit for notifying the telephone control device, the telephone control device for each extension telephone terminal based on the route information and the line length information notified from each hub. A terminal control unit that calculates a terminal delay correction value for correcting a delay time of the synchronization pulse signal in the terminal, and includes a synchronization control unit that notifies the extension telephone terminal of the obtained terminal delay correction value; And a timing specifying unit for specifying the operation timing based on the synchronization pulse signal and correcting the operation timing based on the terminal delay correction value.

  The communication system according to the present invention includes a plurality of cascade-connected hubs, and a plurality of terminals and management devices connected via the hubs, and the management device executes each of the terminals. A synchronization pulse signal for synchronizing a specific processing operation between these terminals is generated and distributed to each of the terminals via the hub, and each terminal performs an operation timing of the processing operation based on the synchronization pulse signal. The hub is configured to check each connected device connected to itself, and to notify the management device of the obtained route information, and to each hub connected to the hub. A line length measuring unit that measures the line length between each connected device and notifies the management apparatus of the obtained line length information, and the management apparatus includes the route information notified from each hub. And based on the line length information, for each terminal, calculate a terminal delay correction value for correcting the delay time of the synchronization pulse signal in the terminal, the obtained terminal delay correction value for the terminal A synchronization control unit for notifying is provided, and the terminal includes a timing specifying unit for specifying the operation timing based on the synchronization pulse signal and correcting the operation timing based on the terminal delay correction value.

  According to the present invention, even if the arrival of the synchronization pulse signal varies depending on the number of hubs connected in cascade and the line length of the transmission path, the operation timing can be appropriately specified in each terminal.

It is a block diagram which shows the structure of the telephone system concerning 1st Embodiment. It is a structural example of route information. It is an example of composition of track length information. It is a block diagram which shows the structure of the hub concerning 1st Embodiment. It is a block diagram which shows the structure of the radio | wireless telephone terminal concerning 1st Embodiment. It is a sequence diagram which shows the synchronous control operation | movement concerning 1st Embodiment. It is a structural example of the correction value calculation table used for calculation of a terminal delay correction value. It is a structural example of the correction time calculation table used for calculation of correction time. It is explanatory drawing which shows the example of a calculation process of a terminal delay correction value. 6 is a timing chart illustrating an example of a slot synchronization timing correction operation according to the first embodiment. It is a block diagram which shows the structure of the extension telephone terminal concerning 2nd Embodiment. 10 is a timing chart illustrating an example of an operation timing correction operation according to the second embodiment.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, a telephone system 1 according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the telephone system according to the first embodiment.

  A telephone system 1 shown in FIG. 1 includes a telephone system such as a business phone, a button telephone device, and a PBX system used in an office, an office, and a store. A plurality of cascade-connected hubs (HUBs) 30 and these hubs 30 are used. A plurality of extension telephone terminals 20 connected via an extension transmission line, and a telephone control device 10 for exchanging and connecting these extension telephone terminals 20 to the telephone network NW.

  In addition to the general wired telephone terminal 21 in which the handset is connected to the terminal main body using a curled cord, the extension telephone terminal 20 is wirelessly connected to the terminal main body (wireless master unit). Wireless telephone terminal 22 is included. These wireless telephone terminals 22 have a function of performing wireless communication based on the DECT method, which is one of the time division multidimensional connection methods, and details will be described later. In this embodiment, the case where the radio system used in each radio telephone terminal 22 is the DECT system will be described. However, the present invention is not limited to the DECT system, and other general time division multiple access radio systems are used. There may be.

  In the telephone system 1, the telephone control device 10 generates a synchronization pulse signal indicating a reference time position of each time slot used for wireless communication at each wireless telephone terminal 22, and transmits the synchronization pulse signal to each wireless telephone terminal 22 via the hub 30. Each wireless telephone terminal 22 has a function of performing wireless communication by specifying slot synchronization timing relating to a time slot assigned to each wireless telephone terminal 22 based on the synchronization pulse signal.

  In the present embodiment, the hub 30 confirms each connected device connected to itself, notifies the obtained route information to the telephone control device 10, and communicates with each connected device connected to itself. The line length information is measured and the obtained line length information is notified to the telephone control apparatus 10, and the telephone control apparatus 10 is based on the route information and the line length information notified from each hub 30. Every time, a terminal delay correction value for correcting the delay time of the synchronization pulse signal in the radio telephone terminal 22 is calculated, the obtained terminal delay correction value is notified to the radio telephone terminal 22, and the radio telephone terminal 22 specifies the slot synchronization timing based on the synchronization pulse signal distributed from the telephone control device 10 and also detects the slot based on the terminal delay correction value notified from the telephone control device 10. It is obtained so as to correct the synchronization timing.

[Telephone control device]
Next, the configuration of the telephone control device 10 according to the present embodiment will be described in detail.
As shown in FIG. 1, the telephone control apparatus 10 includes, as main functional units, a network I / F unit 11, a port I / F unit 12, a switch unit 13, a synchronization pulse signal generation unit 14, a storage unit 15, and A control unit 16 is provided.

  The network I / F unit 11 is composed of a general line I / F circuit, is connected to the communication line L1 from the telephone network NW, and sends various call control messages to the telephone network NW via the communication line L1. It has a function of exchanging and a function of exchanging voice via a telephone line formed with the telephone network NW. The telephone network NW includes a telephone network such as PSTN, IP telephone network, and ISDN, and the network I / F unit 11 may be configured in accordance with each network interface.

  The port I / F unit 12 comprises a general LAN connection port circuit, and exchanges various control messages by transmitting and receiving packets to and from the extension telephone terminal 20 under the hub 30 via the LAN cable L2. A function of exchanging voice data via a voice path formed with these extension telephone terminals 20 by transmitting and receiving the packet, and a synchronization pulse signal generated by the synchronization pulse signal generation unit This function has a function of delivering to each extension telephone terminal 20 by being superimposed on the power supply line.

  The switch unit 13 has a voice line formed between the telephone network NW via the network I / F unit 11 and a voice path formed between the extension telephone terminal 20 via the port I / F unit 12. It has a function to exchange and connect with each other.

  The synchronization pulse signal generation unit 14 has a function of generating a synchronization pulse signal for synchronizing the operations executed in each terminal between these terminals. The synchronization pulse signal may be composed of one rectangular pulse signal or a plurality of pulse trains. In the present embodiment, a case will be described as an example where the synchronization pulse signal is composed of a synchronization pulse signal indicating the reference time position of each time slot used for wireless communication at each wireless telephone terminal 22.

The storage unit 15 includes a storage device such as a semiconductor memory or a hard disk, and has a function of storing various processing information used by the control unit 16 and programs executed by the CPU of the control unit 16.
The main processing information stored in the storage unit 15 includes route information 15A and line length information 15B.

The route information 15 </ b> A is data indicating a connection route related to a connected device connected under the telephone control device 10.
FIG. 2 is a configuration example of route information. Here, for each hub ID, the connected device ID connected to the subordinate (downlink port) of the hub, for example, the MAC address of the extension telephone terminal 20 or the hub 30 is registered as a list.

The line length information 15 </ b> B is data indicating the line length between the connected devices connected to each hub 30.
FIG. 3 is a configuration example of the line length information. Here, for each combination of the hub 30 and connected devices, that is, the telephone control device 10, the extension telephone terminal 20, and the hub 30, the line length of the LAN cable connecting the two is registered.

The control unit 16 includes a CPU and its peripheral circuits, and has a function of controlling the entire telephone system 1 by various processing units realized by executing a program read from the storage unit 15 by the CPU.
The main processing units realized by the control unit 16 include a call control unit 16A and a synchronization control unit 16B.

  The call control unit 16A exchanges various call control messages with the telephone network NW via the network I / F unit 11, thereby making outgoing / incoming calls using the telephone network NW and connection / disconnection of the telephone line. Calls such as operation control of the extension telephone terminal 20 and voice bus connection / disconnection by exchanging various control messages between the function of performing line control and the extension telephone terminal 20 via the port I / F unit 12 And a function of controlling the switching connection between the telephone line from the telephone network NW and the voice path from the extension telephone terminal 20 by the switch unit 13.

  The synchronization control unit 16B is connected from the port I / F unit 12 to each hub 30 in response to a synchronization setting instruction from the administrator input from a personal computer connected to the telephone control device 10 or a specific extension telephone terminal 20. A function of notifying a control message indicating an information request instruction, a function of storing the route information and the line length information acquired from the hub 30 in the storage unit 15 as the route information 15A and the line length information 15B, respectively, and the route information 15A And a function for calculating a terminal delay correction value for correcting the delay time of the synchronization pulse signal in the extension telephone terminal 20 for each extension telephone terminal 20 based on the line length information 15B, and the obtained terminal delay correction value Is sent to the extension telephone terminal 20 via the port I / F unit 12 by a control message.

[Hub]
Next, the configuration of the hub 30 according to the present embodiment will be described in detail with reference to FIG. FIG. 4 is a block diagram illustrating a configuration of the hub according to the first embodiment.
The hub 30 is connected to the telephone control device 10 and the extension telephone terminal 20 via a LAN cable, and further cascaded between the hubs 30 via a LAN cable, so that the telephone control device 10 positioned at the highest level is connected to the hub 30. It has a function of forming an extension transmission path for mutually transferring packets exchanged with the extension telephone terminal 20 located at the lowest level.

  The hub 30 includes, as main functional units, an uplink port I / F unit 31, a downlink port I / F unit 32, a synchronization pulse signal regeneration unit 33, a transfer processing unit 34, a path confirmation unit 35, and a line length measurement. Part 36 is configured.

  The uplink port I / F unit 31 includes a general LAN connection port circuit. The uplink port I / F unit 31 has a function of exchanging packets with the higher-level telephone control device 10 and the hub 30 connected via the LAN cable L2, and these higher-level ports. It has a function of receiving the synchronization pulse signal distributed from the side connection device via the power supply line in the LAN cable and outputting it to the synchronization pulse signal regeneration unit 33.

  The downlink port I / F unit 32 includes a plurality of general LAN connection port circuits, and exchanges packets with the extension telephone terminal 20 and the hub 30 connected thereto via the LAN cable L3. It has a function of distributing the synchronization pulse signal output from the synchronization pulse signal regeneration unit 33 to these connected devices via a feeder line in the LAN cable.

The synchronization pulse signal regeneration unit 33 has a function of regenerating (retiming) the synchronization pulse signal output from the uplink port I / F unit 31 and outputting it to the downlink port I / F unit 32.
The transfer processing unit 34 has a function of transferring a packet between the uplink port I / F unit 31 and the downlink port I / F unit 32 based on the address of the packet.

  In response to a control message indicating an information request instruction received from the telephone control device 10 via the uplink port I / F unit 31, the route confirmation unit 35 receives the uplink port I / F unit 31 or the down link via the LAN cable. A function for confirming the connected device connected to the link port I / F unit 32 and path information including the MAC address list of the connected device whose connection has been confirmed is sent via the port I / F unit 23A by the control message to the telephone control device 10 And a function of notifying the user. As for the connection route acquisition method, a known method such as acquiring the MAC address of the connection device managed as a table by a general hub as described in Patent Document 2, for example, may be used.

  In response to a control message indicating an information request instruction received from the telephone control device 10 via the uplink port I / F unit 31, the line length measurement unit 36 transmits the uplink port I / F unit 31 or the like via the LAN cable. A function for measuring the line length between the connected devices connected to the downlink port I / F unit 32 and the telephone control via the uplink port I / F unit 31 using the control message for the obtained line length information. And a function of notifying the device 10. For the line length measurement method, for example, the line length of the LAN cable connected to the lower side connection device based on the round trip time and amplitude attenuation measured from the reflected wave of the measurement pulse transmitted to the connection device. A known method such as TDR (Time Domain Reflectometry) may be used.

[Wireless phone terminal]
Next, the configuration of the radio telephone terminal 22 will be described in detail with reference to FIG. FIG. 5 is a block diagram showing the configuration of the radiotelephone terminal according to the first embodiment.
The wireless telephone terminal 22 includes a wireless master device (terminal body) 23 connected to the extension transmission path and a wireless slave device (handset) 24 that performs wireless communication with the wireless master device 23 based on the DECT method. It is configured.
The wireless master unit 23 is provided with a port I / F unit 23A, a wireless I / F unit 23B, a timing specifying unit 23C, and a master unit processing unit 23D as main functional units.

  The port I / F unit 23A includes a LAN I / F port circuit as a whole. The port I / F unit 23A exchanges various control messages by transmitting and receiving packets to and from the hub 30 connected via the LAN cable L3. A function for exchanging voice data via a voice path formed with the telephone control device 10 and a synchronization pulse signal distributed from the hub 30 via a power supply line in the LAN cable L3, and a timing specifying unit And a function of outputting to 23C.

  The wireless I / F unit 23B performs wireless communication with the wireless slave device 24 that is paired by using a timelot assigned in advance based on the slot synchronization timing output from the timing specifying unit 23C. And has a function of exchanging various control messages and voice data.

  The timing specifying unit 23C specifies the slot synchronization timing related to the time lot assigned to the radio telephone terminal 22 in advance based on the synchronization pulse signal output from the port I / F unit 23A, and the radio I / F unit 23B, and a function of correcting the slot synchronization timing based on the terminal delay correction value output from the master processing unit 23D.

  The base unit processing unit 23D exchanges control messages with the telephone control device 10 via the port I / F unit 23A, thereby performing various visible / audible display controls on the wireless telephone terminal 22 and voice paths to the telephone control device 10. The function of performing connection / disconnection control and the exchange of control messages with the wireless slave unit 24 via the wireless I / F unit 23B allow various display controls in the wireless slave unit 24 and the voice path with the wireless slave unit 24 to be transmitted. A function for performing connection / disconnection control, a function for exchanging and connecting a voice path formed between the telephone control apparatus 10 and a voice path formed between the wireless slave units 24, and a control message from the telephone control apparatus 10 And a function of outputting the notified terminal delay correction value to the timing specifying unit 23C.

[Operation of First Embodiment]
Next, the operation of the telephone system 1 according to the present embodiment will be described with reference to FIG. FIG. 6 is a sequence diagram illustrating a synchronization control operation according to the first embodiment.
The synchronization control operation shown in FIG. 6 is executed in response to a synchronization setting instruction from the administrator input from a personal computer connected to the telephone control device 10 or a specific extension telephone terminal 20.

  First, the synchronization control unit 16B of the telephone control device 10 notifies a control message indicating an information request instruction from the port I / F unit 12 to each hub 30 (step 100).

The route confirmation unit 35 of each hub 30 confirms the connected device connected to itself via the LAN cable in response to the information request instruction notified from the telephone control device 10 (step 101), and the obtained route. Information is notified to the telephone control device 10 (step 102).
Further, the line length measuring unit 36 of each hub 30 measures the line length between the subordinate connected devices connected to itself via a LAN cable in response to an information request instruction from the telephone control device 10. (Step 103), the obtained line length information is notified to the telephone control device 10 (Step 104).

  The synchronization control unit 16B of the telephone control device 10 stores the route information and the line length information notified from each hub 30 in response to the information request instruction in the storage unit 15 as the route information 15A and the line length information 15B (Step 105). ) Based on the route information 15A and the line length information 15B, the synchronization pulse signal of the radio telephone terminal 22 is determined for each extension telephone terminal 20, and here, for each radio telephone terminal 22, since the slot synchronization timing is a synchronization target. A terminal delay correction value for correcting the delay time is calculated (step 106), and the obtained terminal delay correction value is notified to the wireless telephone terminal 22 via the port I / F unit 12 by a control message (step 107). ).

  The timing specifying unit 23C of each radiotelephone terminal 22 corrects the slot synchronization timing specified from the synchronization pulse signal output from the port I / F unit 23A based on the terminal delay correction value notified from the telephone control device 10. (Step 108). Thereafter, wireless communication is performed between the wireless master device 23 and the wireless slave device 24 of the wireless telephone terminal 22 based on the corrected slot synchronization timing.

[Terminal delay correction value calculation example]
Next, a calculation example of the terminal delay correction value in the telephone control device 10 will be described with reference to FIG. FIG. 7 is a configuration example of a correction value calculation table used for calculating the terminal delay correction value. FIG. 7A shows a line delay correction value calculation table, and FIG. 7B shows a hub delay correction value calculation table. Show.

  The delay related to the synchronization pulse signal delivered from the telephone control device 10 to any extension telephone terminal 20 is the line length L that forms the connection path from the telephone control device 10 to the extension telephone terminal 20 and the hub that forms the connection path. The line length and the hub connection stage number are influenced by the hub connection stage number H of 30, and delay the synchronization pulse signal independently of each other. The present invention pays attention to such delay characteristics of the synchronization pulse signal, and a line delay correction value RL for correcting a delay caused by the line length L and a hub for correcting a delay caused by the number H of hub connection stages. The delay correction value RH is calculated separately.

  Therefore, first, the synchronization control unit 16B of the telephone control device 10 specifies a connection route from the telephone control device 10 to the wireless telephone terminal 22 for each wireless telephone terminal 22 based on the route information 15A of the storage unit 15. . At this time, by tracking the MAC address of the wireless telephone terminal 22 for each wireless telephone terminal 22 from the path information 15A indicating the correspondence relationship between the hub and the connected device, the telephone controller 10 to the wireless telephone terminal 22 What is necessary is just to specify the connection path of.

  Next, the synchronization control unit 16B calculates the line length L from the telephone control device 10 to the radio telephone terminal 22 based on the line length information 15B in the storage unit 15, and the line delay correction value in FIG. A line delay correction value RL corresponding to the line length L is calculated based on the calculation table. At this time, the line length between the hubs 30 located on the connection path and the distance between the lowest hub 30 and the radio telephone terminal 22 are obtained from the line length information 15B indicating the correspondence between the hubs and the connected devices and the line lengths. The line length L may be calculated by adding the line length.

  Further, the synchronization control unit 16B calculates the hub connection stage number H of each hub 30 constituting the connection path, and hub delay correction corresponding to the hub connection stage number H based on the hub delay correction value calculation table of FIG. The value RH is calculated. At this time, the hub 30 located on the connection path is extracted, and the hub connection stage number H may be calculated from the number of these hubs 30.

  The line length L and the hub connection stage number H may be obtained at the time of calculating the terminal delay correction value, but when the route information and the line length information are acquired from each hub 30, the line length L and the hub connection stage number H are obtained. May be obtained in advance and stored in the storage unit 15, and when the terminal delay correction value is calculated, the line length L and the hub connection stage number H may be read from the storage unit 15 and used.

  Thereafter, the synchronization control unit 16B notifies each radiotelephone terminal 22 of the terminal delay correction value composed of the line delay correction value RL and the hub delay correction value RH obtained in this way by a control message.

In the line delay correction value calculation table, a line delay correction value RL indicating a value to be corrected for the line length of the range section is registered for each range section of the line length L. This line delay correction value calculation table may be stored in the storage unit 15 in the form of a table showing the correspondence between the electrical characteristics of the LAN cable and the results obtained from the actual measurement.
In the hub delay correction value calculation table, a hub delay correction value RH indicating a value to be corrected when the hub connection stage number H in the range section is registered for each range section of the hub connection stage number H. The hub delay correction value calculation table may be stored in the storage unit 15 in the form of a correspondence relationship between the two calculated in advance from the operation characteristics of the hub 30.

  The timing specifying unit 23C of each radio telephone terminal 22 is a slot specified from the synchronization pulse signal based on the line delay correction value RL and the hub delay correction value RH included in the terminal delay correction value notified from the telephone control device 10. Correct the synchronization timing. At this time, the line delay correction value RL and the hub delay correction value RH are obtained by indexing the actual correction time. Accordingly, when correcting the slot synchronization timing in the radio telephone terminal 22, it is necessary to calculate the correction time from the line delay correction value RL and the hub delay correction value RH.

  FIG. 8 is a configuration example of a correction time calculation table used for calculating the correction time. FIG. 8A shows a line correction time calculation table, and FIG. 8B shows a hub correction time calculation table.

  In the line correction time calculation table, a line correction time ΔTL for correcting the slot synchronization timing is registered for each line delay correction value RL. This line correction time calculation table may be stored in a storage unit (not shown) of the radiotelephone terminal 22 by making a table showing the electrical characteristics of the LAN cable and the corresponding relationship obtained from actual measurement.

  In the hub correction time calculation table, the hub correction time ΔTH for which the slot synchronization timing is to be corrected is registered for each hub delay correction value RH. The hub correction time calculation table may be a table showing the correspondence between the operation characteristics of the hub 30 and the pre-calculated values based on actual measurement, and stored in a storage unit (not shown) of the radio telephone terminal 22.

The timing specifying unit 23C corrects the slot synchronization timing by the line correction time ΔTL and the hub correction time ΔTH calculated from the line correction time calculation table and the line correction time calculation table.
The case where the telephone control device 10 notifies the radio telephone terminal 22 of the line delay correction value RL and the hub delay correction value RH obtained by indexing the actual correction time has been described as an example, but the line correction time ΔTL is described. The telephone control device 10 may notify the radio telephone terminal 22 of the correction time ΔT obtained by adding the hub correction time ΔTH.

  In the above, the case where the line correction time ΔTL and the hub correction time ΔTH are calculated from the line length L and the hub connection stage number H using a table has been described as an example, but may be calculated using a function formula. FIG. 9 is an explanatory diagram illustrating a calculation process example of a terminal delay correction value. Note that FIG. 9 is an example of terminal delay correction value calculation processing, and the present invention is not limited to this.

  The unit line correction time TLs is a parameter indicating the correction time per unit line length, and the unit hub delay correction time THs is a parameter indicating the correction time per unit hub stage number. Any of these may be calculated in advance from the electrical characteristics of the LAN cable, the operating characteristics of the hub 30, or actual measurements.

Here, the line correction time ΔTL is calculated by multiplying the unit line correction time TLs by the line length L, and the hub correction time ΔTH is calculated by multiplying the unit hub delay correction time THs by the hub connection stage number H. By adding the line correction time ΔTL and the hub correction time ΔTH, a correction time ΔT for the slot synchronization timing corrected in the radio telephone terminal 22 is obtained as a terminal delay correction value for the radio telephone terminal 22.
Basically, these calculation processes are performed by the synchronization control unit 16B, but the line length L and the hub connection stage number H for an arbitrary radio telephone terminal 22 are notified from the synchronization control unit 16B to the radio telephone terminal 22, and the You may calculate in the timing specific | specification part 23C and the main | base station process part 23D of the terminal 22.

[Slot synchronization timing correction operation example]
FIG. 10 is a timing chart illustrating an example of the slot synchronization timing correction operation according to the first embodiment. Here, it is assumed that time slots # 1 and # 2 are assigned to two radio telephone terminals # 1 and # 2 having different connection paths, and the slot synchronization timing of radio telephone terminal # 2 is corrected. Will be described as an example. For ease of explanation, it is assumed that the delay of the synchronization pulse signal P # 1 from the telephone control device 10 to the radio telephone terminal # 1 is negligible.

  First, it is assumed that the time T1 is specified as the reference time position of each time slot based on the falling edge of the synchronization pulse signal P # 1 distributed from the telephone control device 10 in the radio telephone terminal # 1. At this time, since the time slot # 1 is assigned to the radio telephone terminal # 1, the number of time slots Tn from the first slot # 0 to the time slot # 1 is 1. Therefore, the time Ts1 delayed from the time T1 by the time obtained by multiplying Tn by the slot length ts is the slot synchronization timing of the radio telephone terminal # 1.

  Further, it is assumed that the time T2 is specified as the reference time position of each time slot based on the falling edge of the synchronization pulse signal P # 2 distributed from the telephone control device 10 in the radio telephone terminal # 2. At this time, since the time slot # 2 is assigned to the radio telephone terminal # 2, the number of time slots Tn from the first slot # 0 to the time slot # 2 is 2. Therefore, the time Ts2 delayed from the time T2 by the time obtained by multiplying Tn by the slot length ts is the slot synchronization timing of the radio telephone terminal # 2.

  Here, when the connection route from the telephone control device 10 to the radio telephone terminal # 2 is long and the time T2 is delayed from the time range obtained by adding the slot shift allowable time te to the time T1, the synchronization result T # 2 indicates As described above, the time slot # 2 of the radio telephone terminal # 2 is shifted to the time slot # 3 of the radio telephone terminal # 1, and interference occurs between the both time slots, thereby hindering radio communication. The slot shift allowable time te is a time range in which interference between time slots is allowed.

On the other hand, when the correction time ΔT2 is notified from the telephone control device 10 to the radio telephone terminal # 2, the time T2 is corrected to the time T2 ′ earlier by the correction time ΔT2. This is the time when the synchronization pulse signal P # 2 is corrected to the time T2 ′ earlier by the correction time ΔT2, that is, the time delayed by the time obtained by multiplying Tn by the slot length ts from substantially the same time as the time T1. It corresponds to.
Therefore, the slot synchronization timing of the radio telephone terminal # 2 specified by the time T2 ′ is almost the same as the time slot # 2 of the radio telephone terminal # 1, so that the occurrence of interference between the time slots as described above is avoided. Is done.

[Effect of the first embodiment]
As described above, in the present embodiment, the hub 30 confirms each connected device connected to itself, notifies the obtained route information to the telephone control device 10, and each connected device connected to itself. The line length information between each of the hubs 30 is measured, the obtained line length information is notified to the telephone control device 10, and the telephone control device 10 is wireless based on the route information and the line length information notified from each hub 30 For each telephone terminal 22, calculate a terminal delay correction value for correcting the delay time of the synchronization pulse signal in the wireless telephone terminal 22, and notify the wireless telephone terminal 22 of the obtained terminal delay correction value, The radio telephone terminal 22 specifies the slot synchronization timing based on the synchronization pulse signal distributed from the telephone control device 10 and based on the terminal delay correction value notified from the telephone control device 10. It is obtained so as to correct the slot synchronization timing.

  Thereby, based on the terminal delay correction value corresponding to the connection path from the telephone control device 10 to the wireless telephone terminal 22, specifically the line length L and the hub connection stage number H, calculated for each wireless telephone terminal 22. The slot synchronization timing is corrected in each wireless telephone terminal 22. Therefore, even if the arrival of the synchronization pulse signal varies in each radio telephone terminal 22 due to the number of hubs connected in cascade and the line length of the connection path, the slot synchronization timing can be appropriately specified. It is possible to avoid the occurrence of interference between time slots used in the wireless telephone terminal 22.

  Therefore, there is no need to provide restrictions on the line length of the extension transmission path and the number of hubs that can be cascaded due to the slot deviation allowable range te, and the extension transmission path can be freely configured when the radio telephone terminal 22 is installed. be able to. Therefore, even if the layouts of offices, offices, and stores are wide or complicated, the radio telephone terminal 22 can be installed at a location corresponding to each layout, and the telephone is extremely flexible and flexible with respect to the layout. A system can be provided.

  Further, in the present embodiment, the telephone control device 10 has a line correction value calculation table showing the correspondence between the line length L and the line delay correction value RL for correcting the delay due to the line length L, A hub delay correction value calculation table showing a correspondence relationship between the hub connection stage number H and the hub delay correction value RH for correcting the delay caused by the hub 30 is provided, and the synchronization control unit 16B notifies the terminal delay correction value. Based on the line length information 15A and the route information 15B in the storage unit 15, for each radio telephone terminal 22, the line length L and the hub connection stage number H to the radio telephone terminal 22 are calculated and obtained from the line correction value calculation table. Terminal delay including a line delay correction value RL corresponding to the line length L and a hub delay correction value RH corresponding to the hub connection stage number H obtained from the hub delay correction value calculation table. It may be notified of the positive value.

  Thus, the terminal delay of the radio telephone terminal 22 is determined by referring to the line correction value calculation table and the hub delay correction value calculation table based on the line length L and the hub connection stage number H that are the main delay factors of the synchronization pulse signal. A line delay correction value RL and a hub delay correction value RH constituting the correction value are calculated. Therefore, an appropriate terminal delay correction value to be notified to the radio telephone terminal 22 can be calculated by an extremely simple process of referring to the table.

  Further, in this embodiment, the line delay correction value RL and the hub delay correction value RH are values obtained by indexing the correction time for correcting the delay, and the radio telephone terminal 22 receives the line delay correction value RL and the actual value. A line correction time calculation table showing a correspondence relationship with the line correction time ΔTL, and a hub correction time calculation table showing a correspondence relationship between the hub delay correction value RH and the actual hub correction time ΔTH. When correcting the slot synchronization timing, the line correction time ΔTL corresponding to the line delay correction value RL included in the terminal delay correction value obtained from the line correction time calculation table, and the hub delay correction value obtained from the hub correction time calculation table The slot synchronization timing may be corrected based on the hub correction time ΔTH corresponding to RH.

  Thus, when the actual slot synchronization timing is corrected by referring to the line correction time calculation table and the hub correction time calculation table based on the line delay correction value RL and the hub delay correction value RH obtained by indexing the correction time. The line correction time ΔTL and the hub correction time ΔTH necessary for the calculation are calculated. Therefore, an appropriate correction time ΔT to be used for correcting the slot synchronization timing can be calculated by an extremely simple process of referring to the table.

  In the present embodiment, the case where the present invention is applied to the telephone system 1 has been described as an example. However, the present invention is not limited to this. In a communication system in which a plurality of terminals are connected to a management apparatus via a plurality of cascade-connected hubs, a synchronization pulse signal is distributed from the management apparatus to each terminal via the hub, and each terminal receives the synchronization pulse. The present invention can be similarly applied to the case where the operation timing of each operation is synchronized based on a signal. At this time, the communication system, the hub, and the terminal correspond to the telephone system 1, the hub 30, and the wireless telephone terminal 22 of FIG.

[Second Embodiment]
Next, the telephone system 1 concerning the 2nd Embodiment of this invention is demonstrated.
In the first embodiment, the radio telephone terminal 22 specifies the slot synchronization timing related to the time slot allocated to each based on the synchronization pulse signal distributed from the telephone control apparatus 10 and notifies the telephone control apparatus 10 of the slot synchronization timing. The case where the slot synchronization timing is corrected based on the terminal delay correction value thus described has been described as an example. In the present embodiment, a case will be described in which the operation timing of a specific processing operation executed in each extension telephone terminal 20 is synchronized with the synchronization pulse signal instead of the slot synchronization timing.

  In the present embodiment, the hub 30 confirms each connected device connected to itself, notifies the obtained route information to the telephone control device 10, and communicates with each connected device connected to itself. Each of the line lengths of the telephone lines is measured, and the obtained line length information is notified to the telephone control device 10, and the telephone control device 10 extends the extension telephone terminal 20 based on the route information and the line length information notified from each hub 30. Every time, a terminal delay correction value for correcting the delay time of the synchronization pulse signal in the extension telephone terminal 20 is calculated, the obtained terminal delay correction value is notified to the extension telephone terminal 20, and the extension telephone terminal 20 specifies the operation timing based on the synchronization pulse signal distributed from the telephone control device 10, and the operation timing based on the terminal delay correction value notified from the telephone control device 10. It is obtained so as to correct.

  In the present embodiment, the synchronization pulse signal generated by the synchronization pulse signal generation unit 14 of the telephone control device 10 is not a signal indicating the reference time position of each time slot used for wireless communication at each wireless telephone terminal 22, The point which consists of the signal which shows the reference time position used for the specific processing operation in each extension telephone terminal 20 differs from a 1st embodiment. Other configurations in the telephone control device 10 are the same as those in the first embodiment. In the present embodiment, the configuration of the hub 30 is the same as that of the first embodiment.

FIG. 11 is a block diagram showing a configuration of the extension telephone terminal according to the second embodiment.
In the present embodiment, the extension telephone terminal 20 is provided with a port I / F unit 20A, a timing specifying unit 20B, a display unit 20C, a voice processing unit 20D, and a terminal processing unit 20E as main functional units. .

  The port I / F unit 20A includes a general LAN connection port circuit, and transmits and receives packets to and from the hub 30 connected via the LAN cable L3. A function of exchanging voice data via a voice path formed with the telephone control device 10 by transmission / reception, and a synchronization pulse signal distributed from the hub 30 via a power supply line in the LAN cable L3, and receiving timing And a function of outputting to the specifying unit 20B.

  The timing specifying unit 20B specifies the operation timing of the processing operation to be executed by the extension telephone terminal 20 based on the synchronization pulse signal output from the port I / F unit 20A, and outputs the operation timing to the terminal processing unit 20E. And a function of correcting the operation timing based on the terminal delay correction value output from the terminal processing unit 20E.

The display unit 20C includes a display device such as an LED or an LCD, and has a function of performing various visible display processing operations such as incoming call display in accordance with control from the terminal processing unit 20E.
The voice processing unit 20D includes a voice input / output device such as a microphone, a speaker, and a buzzer. And has a function of performing various audible display processing operations such as ringtone output.

  The terminal processing unit 20E exchanges control messages with the telephone control device 10 via the port I / F unit 20A, thereby performing various visible / audible display controls in the display unit 20C and the voice processing unit 20D and the telephone control device 10. A function for performing voice path connection / disconnection control, a function for connecting a voice path formed with the telephone control device 10 and the voice processing unit 20D, and terminal delay correction notified from the telephone control device 10 by a control message And a function of outputting a value to the timing specifying unit 20B.

[Operation of Second Embodiment]
Next, the operation of the telephone system 1 according to the present embodiment will be described with reference to FIG. FIG. 12 is a timing chart illustrating an operation timing correction operation example according to the second embodiment. Here, it is assumed that the cycle of the blinking display operation for the incoming LEDs D # 1 and D # 2 is synchronized in two wireless telephone terminals # 1 and # 2 having different connection paths, and the operation timing of the wireless telephone terminal # 2 is corrected. This will be described as an example. For ease of explanation, it is assumed that the delay of the synchronization pulse signal P # 1 from the telephone control device 10 to the radio telephone terminal # 1 is negligible.

  First, it is assumed that the time T1 is specified as the operation timing in the radio telephone terminal # 1 based on the falling edge of the synchronization pulse signal P # 1 distributed from the telephone control device 10. At this time, the blinking time of the incoming LEDs D # 1, D # 2 is ta, and the extinguishing time is tb. Therefore, in the wireless telephone terminal # 1, the incoming LEDD # 1 is blinked for the time ta from the time T1, and then the incoming LEDD # 1 is turned off for the time tb, and then the blinking display and the light extinction are periodically repeated. .

  Further, it is assumed that the time T2 is specified as the operation timing in the radio telephone terminal # 2 based on the falling edge of the synchronization pulse signal P # 2 distributed from the telephone control device 10. At this time, in the wireless telephone terminal # 2, the incoming LEDD # 2 is blinked and displayed for the time ta from the time T2, and then the incoming LEDD # 2 is extinguished for the time tb. Become.

  Here, when the connection path from the telephone control device 10 to the wireless telephone terminal # 2 is long and the time T2 is delayed from the time T1, the incoming LEDD # 2 of the wireless telephone terminal # 2 is received by the wireless telephone terminal # 1. Blinking display and extinguishing are periodically repeated with a delay from LEDD # 1. For this reason, if a deviation occurs in these operation timings, the user may feel uncomfortable or uncomfortable.

On the other hand, when the correction time ΔT2 is notified from the telephone control device 10 to the radio telephone terminal # 2, a time T2 ′ that is substantially equal to the time T1 from this ΔT2 is specified as an operation timing, and this time T2 ′ is used as a reference. The display operation of the incoming LEDD # 2 at the time position is started.
Accordingly, the incoming LEDD # 2 of the wireless telephone terminal # 2 performs a display operation almost synchronously with the incoming LEDD # 1 of the wireless telephone terminal # 1, and the user feels uncomfortable or uncomfortable due to a difference in operation timing. It can be avoided.

[Effect of the second embodiment]
As described above, according to the present embodiment, the hub 30 confirms each connected device connected to itself, notifies the obtained route information to the telephone control device 10, and each connection connected to itself. The line length between the devices is measured, the obtained line length information is notified to the telephone control device 10, and the telephone control device 10 is based on the route information and the line length information notified from each hub 30, For each extension telephone terminal 20, a terminal delay correction value for correcting the delay time of the synchronization pulse signal in the extension telephone terminal 20 is calculated, and the obtained terminal delay correction value is notified to the extension telephone terminal 20. The extension telephone terminal 20 specifies the operation timing based on the synchronization pulse signal distributed from the telephone control device 10 and also operates based on the terminal delay correction value notified from the telephone control device 10. It is obtained so as to correct the timing.

  Thereby, based on the terminal delay correction value according to the connection path from the telephone control device 10 to the extension telephone terminal 20, specifically the line length L and the hub connection stage number H, calculated for each extension telephone terminal 20. The operation timing is corrected in each extension telephone terminal 20. For this reason, even if variations in the arrival of the synchronization pulse signal occur in each radio telephone terminal 22 due to the number of hubs connected in cascade and the line length of the connection path, processing operation deviation occurs between the radio telephone terminals 22. Can be avoided.

  Therefore, it is not necessary to provide restrictions on the length of the extension transmission line and the number of hubs that can be cascaded in order to suppress a shift in processing operation, and the extension transmission line can be freely configured when installing the extension telephone terminal 20. Can do. Therefore, even if the layout of offices, offices, and stores is wide or complicated, the extension telephone terminal 20 can be installed in a place corresponding to each layout, and the telephone is extremely flexible and flexible with respect to the layout. A system can be provided.

[Extended embodiment]
The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention. In addition, each embodiment can be implemented in any combination within a consistent range.

  DESCRIPTION OF SYMBOLS 1 ... Telephone system, 10 ... Telephone control apparatus, 11 ... Network I / F part, 12 ... Port I / F part, 13 ... Switch part, 14 ... Synchronization pulse signal generation part, 15 ... Memory | storage part, 16 ... Control part, DESCRIPTION OF SYMBOLS 20 ... Extension telephone terminal, 20A ... Port I / F part, 20B ... Timing identification part, 20C ... Display part, 20D ... Voice processing part, 20E ... Terminal processing part, 21 ... Wired telephone terminal, 22 ... Wireless telephone terminal, 23 ... Wireless base unit, 23A ... Port I / F unit, 23B ... Wireless I / F unit, 23C ... Timing specifying unit, 23D ... Base unit processing unit, 24 ... Wireless slave unit, 30 ... Hub, 31 ... Uplink port I / F unit, 32 ... downlink port I / F unit, 33 ... synchronization pulse signal regeneration unit, 34 ... transfer processing unit, 35 ... path confirmation unit, 36 ... line length measurement unit, NW ... telephone network, L1 ... communication line , L2, L3 ... LAN cable.

Claims (6)

Cascade-connected multiple hubs, multiple wireless telephone terminals that perform wireless communication based on the time-division multi-dimensional connection method connected via these hubs, and telephone control that exchanges and connects these wireless telephone terminals to the telephone network And the telephone control device generates a synchronization pulse signal indicating a reference time position of each time slot used for the wireless communication, distributes the signal to each wireless phone terminal via the hub, and A telephone system for performing wireless communication by specifying slot synchronization timings related to time slots assigned to respective telephone terminals based on the synchronization pulse signal,
The hub confirms each connected device connected to itself, and notifies the obtained route information to the telephone control device, and a line length between each connected device connected to the hub. A line length measuring unit for measuring the obtained line length information and notifying the telephone control device of the obtained line length information,
The telephone control device is a terminal for correcting a delay time of the synchronization pulse signal in the radio telephone terminal for each radio telephone terminal based on the route information and the line length information notified from each hub. A delay control value is calculated, and a synchronization control unit is provided for notifying the wireless telephone terminal of the obtained terminal delay correction value.
The radio telephone terminal includes a timing specifying unit that specifies the slot synchronization timing based on the synchronization pulse signal and corrects the slot synchronization timing based on the terminal delay correction value. The telephone system according to claim 1, wherein
The telephone control device includes a line correction value calculation table showing a correspondence relationship between the line length and a line delay correction value for correcting a delay due to the line length, the number of hub connection stages of the hub, and a delay due to the hub. A hub delay correction value calculation table showing a correspondence relationship with the hub delay correction value for
When notifying the terminal delay correction value, the synchronization control unit calculates a line length and a hub connection stage number to the radio telephone terminal for each radio telephone terminal based on the line length information and the path information. The terminal delay correction including a line delay correction value corresponding to the line length obtained from the line correction value calculation table, and a hub delay correction value corresponding to the hub connection stage number obtained from the hub delay correction value calculation table. A telephone system characterized by notifying a value. The telephone system according to claim 2, wherein
The line delay correction value and the hub delay correction value consist of values obtained by indexing the correction time for correcting the delay,
The radio telephone terminal includes a line correction time calculation table showing a correspondence relationship between the line delay correction value and an actual line correction time, and a hub correction time showing a correspondence relationship between the hub delay correction value and an actual hub correction time. A calculation table,
The timing specifying unit, when correcting the slot synchronization timing, a line correction time corresponding to the line delay correction value included in the terminal delay correction value obtained from the line correction time calculation table, and the hub correction time calculation The telephone system, wherein the slot synchronization timing is corrected based on a hub correction time corresponding to the hub delay correction value obtained from a table. Cascade-connected multiple hubs, multiple wireless telephone terminals that perform wireless communication based on the time-division multi-dimensional connection method connected via these hubs, and telephone control that exchanges and connects these wireless telephone terminals to the telephone network And the telephone control device generates a synchronization pulse signal indicating a reference time position of each time slot used for the wireless communication, distributes the signal to each wireless phone terminal via the hub, and The wireless telephone terminal used in a telephone system for performing wireless communication by specifying slot synchronization timing related to a time slot assigned to each telephone terminal based on the synchronization pulse signal,
The slot synchronization timing is specified based on the synchronization pulse signal, and calculated and notified by the telephone control device based on the route information and line length information regarding the connected device of the hub notified from each hub. A wireless telephone terminal comprising: a timing specifying unit that corrects the slot synchronization timing based on a terminal delay correction value for correcting a delay time of the synchronization pulse signal in the wireless telephone terminal. A plurality of cascade-connected hubs, a plurality of extension telephone terminals connected via the hubs, and a telephone control device for switching and connecting the extension telephone terminals to a telephone network, A synchronization pulse signal for synchronizing a specific processing operation executed by each extension telephone terminal is generated between the extension telephone terminals, and is delivered to each extension telephone terminal via the hub, and each extension telephone terminal A telephone system for synchronizing the operation timing of the processing operation based on the synchronization pulse signal,
The hub confirms each connected device connected to itself, and notifies the obtained route information to the telephone control device, and a line length between each connected device connected to the hub. A line length measuring unit for measuring the obtained line length information and notifying the telephone control device of the obtained line length information,
The telephone control device is a terminal for correcting a delay time of the synchronization pulse signal in the extension telephone terminal for each extension telephone terminal based on the route information and the line length information notified from each hub. A delay control value is calculated, and a synchronization control unit that notifies the extension telephone terminal of the obtained terminal delay correction value is provided.
The extension telephone terminal includes a timing specifying unit that specifies the operation timing based on the synchronization pulse signal and corrects the operation timing based on the terminal delay correction value. A plurality of cascade-connected hubs, and a plurality of terminals and management devices connected via these hubs, and the management device synchronizes specific processing operations executed by each of the terminals. Generating a synchronization pulse signal for distribution to each terminal via the hub, each terminal is a communication system that synchronizes the operation timing of the processing operation based on the synchronization pulse signal,
The hub confirms each connected device connected to the hub, and determines the line length between the route confirming unit for notifying the management device of the obtained route information and each connected device connected to the hub. Each comprises a line length measurement unit that measures and notifies the management device of the obtained line length information,
The management device calculates a terminal delay correction value for correcting a delay time of the synchronization pulse signal in the terminal for each terminal based on the route information and the line length information notified from each hub. A synchronization control unit for notifying the terminal of the obtained terminal delay correction value,
The said terminal is provided with the timing specific part which correct | amends the said operation timing based on the said terminal delay correction value while specifying the said operation timing based on the said synchronous pulse signal. The communication system characterized by the above-mentioned.

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