JPH0773376B2 - Call control system with transparent connection between two buses - Google Patents

Description

The present invention relates to a home network system (home bus).
In the above, the present invention relates to a control system for a telephone connected to different transmission paths in a bus shape.

2. Description of the Related Art As a connection form of a conventional bus-type connection telephone, the configuration shown in FIG. 4 is often used. That is, the main unit 38 of FIG. 4 accommodates the telephone line 1 and has functions such as an incoming call detection, an outgoing / incoming collision detection, a polarity reversal detection, a dial selection signal transmission and a DC loop closure for the telephone line 1. In addition to the information signal lines 4, 5 and 6 which form a bus in the house and the closed telephones 34 and 35 which are connected to the control signal line 3 in the same transmission line system by the control signal line 3, Device 3
8 controlled by sending and receiving control information. FIG. 5 shows control information such as commands using the control signal line 3 when the telephones 34 and 35 connected to the same transmission line like the bus in the configuration of FIG. FIG. 6 is a diagram showing a communication sequence between the main device 38 and telephones 34, 35 of FIG. In the telephone 34, when the CPU control unit 16 detects the off-hook of the transmitting / receiving unit 15, the CPU control unit 16 transmits the control signal to the main device 38 via the transceiver 13 to notify the off-hook. Further, when the telephone line is selected by the telephone 34, the CPU control unit 16 notifies the main unit 38 of the telephone line designation with the selected station line NO, and the main unit 38 informs the telephone line 1 which is the central line and the information signal. Lines 4, 5 and 6 are seized and use of the requested telephone line is designated and information signal lines for which seizure and use are permitted are transmitted from the main unit 38 to the telephone 34, and then the telephone line built in the main unit 38 1 controls the switching circuit of the information signal lines 4, 5 and 6 to connect the telephone line 1 to the information signal lines permitted to be used. When the telephone 34 receives the information signal line connection notification shown in FIG. 5, the CPU control unit 16 of the telephone 3 connects the information signal line permitted to be used by the main unit 38, and the loop closing unit 31 makes a telephone line connection. By closing the DC loop with respect to 1, the telephone 34 is connected to the central office line and the selection signal can be transmitted. Therefore, when a dial notification is transmitted from the telephone set 34 to the main device 38, the main device 38 sends a selection signal to the telephone line 1 by controlling a selection signal transmitting section incorporated in the main device 38 for a selection signal corresponding to the dial notification. As a result, the telephone set 34 is in a talking state via the telephone line 1. Thus, main device 38 and telephones 34,3
A method of connecting 5 to the same control signal line and transmitting / receiving control information according to a predetermined communication sequence was used. It should be noted that some of the components that are common to the embodiments of the present invention will not be described.

Problems to be Solved by the Invention In such a conventional method, the main device 38 can control the closed telephones 34 and 35 in the same transmission line system connected to the bus, but is connected to different transmission lines. It has the disadvantage that the main unit 38 cannot simultaneously control the telephone set. Also, for extension telephone calls between telephones connected to different transmission lines, the connection method is complicated and largely different due to the difference in the type of transmission medium that transmits information (for example, metal line and power line), and the control of the telephone by the main unit 38 However, it also has the drawback of being complicated.

The present invention has been made in view of the above point, and efficiently controls the telephones connected to different transmission lines with a simple hardware configuration and connected to the respective transmission lines by the same main device. It is intended to provide a control method of a bus-type connected telephone by controlling without being aware that the telephone is connected to a different transmission line when viewed.

Means for Solving the Problems In order to solve the above problems, the first aspect of the present invention uses at least one information signal line for transmitting an information signal and a control signal line for transmitting a control signal as a logical coupling unit. The transmission line system and at least one subscriber telephone line are accommodated, one circuit is exchanged between the subscriber telephone line and the information signal line, and one main device for centrally controlling the call to the telephone; Of the first transmission line system, which is connected to the transmission line system in the form of a bus and is controlled by the main device using the control signal line, and a second transmission line whose medium is different from that of the first transmission line system. A second telephone connected to the system in the form of a bus and provided with the same call control function as the call control function provided by the main device to the first telephone; and the first transmission line system. And the second transmission line system In addition to being physically and logically coupled, a control signal having the address of the first or second telephone is received from the main unit, and an information signal is transparently transmitted between the first and second transmission line systems. And a gateway for performing exchange control, wherein the gateway has a loop closure unit capable of forming a DC loop with respect to the information signal line connected to the subscriber telephone line by the main device, Further, the gateway and the second telephone are bus-type connected telephone control systems configured to have a modulator / demodulator for modulating and demodulating a baseband information signal.

The present invention has the above-described configuration, and in the communication processing in the case where the only main device controls the extension call between the first telephone and the second telephone, the flow of the control signal relating to the call control processing of the extension telephone is Although it is transmitted via all of the second telephone, the gateway, the main unit and the first telephone, the information signal such as voice does not need to pass through the main unit, and is directly transmitted to the second telephone. A call path is established between the gateway and the same telephone as the gateway. Therefore, in the present invention, it is possible to omit the control of the communication path of the information signal during the extension call control of the main device, so that it is possible to simplify the configuration of the main device and reduce the load of the call control process. , Only one information signal line needs to be used (rather than two information signal lines for the route from the first telephone to the main device and the route from the main device to the second telephone). It is possible to improve the efficiency of line usage.

Practical Example FIG. 1 is a diagram showing a configuration for realizing a bus-type connected telephone control system in an embodiment of the present invention. FIG. 2 is a diagram showing a communication sequence for controlling the bus-type connected telephone in FIG.

In FIG. 1, 1 is a telephone line, 4 and 5 and 6 are information signal lines of balanced type pair cables used for transmission of digital information data, extension line calls and station line calls with the telephone line 1, and 3 is the information signal line. A control signal line for transmitting control information for performing exchange control between the telephone lines 1 and 4 and the telephone line 1, control of the central line to the telephone line 1, and state control of the telephone. Each line of the control signal line 3 is terminated by a terminator 7. Reference numeral 2 is a main device, which is a circuit switch between the telephone line 1 and the information signal lines 4, 5, 6 and an incoming call detection, outgoing / incoming collision detection, polarity reversal detection, selection signal detection, DC loop closure and control signal line for the telephone line 1. Three
It has various functions such as sending and receiving control information from and interpreting. 33 is the control signal line 3 and the information signal lines 4,5,6
A transceiver which is connected to the main unit 2 and can be controlled by control information transmitted / received to / from the main unit 2 and which transmits / receives control information to / from a control signal line;
Exchange circuit 14, loop closing unit 31 forming a DC loop, handset transmitter / receiver unit 15 that enables handset communication such as a speaker and a microphone, and key input control of telephone, state control, transmission / interpretation and interpretation of control information, exchange circuit 14 And a CPU control unit 16 for controlling the transmission / reception 15. Reference numeral 13 is a transmission line of a medium different from that of the information signal lines 4, 5 and 6 such as coaxial or power destination and the control signal line 3, and 36 and 37 are the transmission lines 13
Is a telephone set as a second telephone set which is connected to and whose state is controlled by control information from the main unit 2. Reference numerals 22 and 27 are transceivers having a driver and a receiver for transmitting and receiving the control information transmitted via the transmission line 13 between the transmission line 13 and the CPU control units 11, 23 and 28. 20, 25 and 10 are transmission lines 13
A communication circuit for modulating the information signal to be transmitted when transmitting the information signal to the transmission signal, and demodulating the modulated information signal when transmitting it from the transmission line 13.
In the illustrated embodiment, there are two pairs of communication paths, one each for upstream and one for downstream. 21 and 26 are exchange circuits for selectively exchanging call circuits 20 and 25 of telephones 36 and 37, 24 and 29 are earpieces that enable handset conversation such as speaker and microphone, and 23 and 28 are CPU control of telephones 36 and 37. Units 23 and 28 control transmission / reception circuits 21 and 26 with transceivers 22 and 27, transmission / reception units 24 and 29, and communication circuits 20 and 25. 32 is one of the information signal circuits 4, 5 and 6 and each line of the control signal line 3, that is, the information signal and control information transmitted by the first transmission line system, and the transmission line 13, that is, the second line. Is a gateway that transparently relays control information and information signals that are modulated and transmitted by the transmission path system. 8 is a transceiver composed of a driver and a receiver for transmitting / receiving to / from the control signal line 3, 12 is a driver and a receiver for transmitting / receiving to / from the transmission line 13, 9 is a switching circuit for exchanging the information signal lines 4, 5 and 6.
Reference numeral 0 is a loop closing portion for forming a direct current loop for the central office line by transformer coupling by further exchanging and connecting the telephone line and the information signal line connected by the exchange of the main unit 2 by the exchange circuit 9, and 11 is the communication circuit 10 And a control circuit for controlling the exchange circuit 9 for transmitting / receiving control information to / from the transceiver 8, managing the usage state of the communication path, and converting a transmission protocol such as a control information transmission format.

Next, the processing operation by the above configuration will be shown.

In the system configuration shown in FIG. 1, when the telephone 37 originates an office line from the telephone line 1, control information is transferred between the CPU control unit 28 and the main unit 2 through the gateway 32 to transmit and receive information signals. Conversion control and communication path control of the transmission line are performed. FIG. 2 shows a communication sequence of control information between the telephone set 37 and the gateway 32 and between the gateway 32 and the main unit 2 and the processing contents of the telephone set 37, the gateway 32 and the main unit 2 in this case.

The control means of the telephone is shown below according to the communication sequence of FIG. When the telephone set 37 detects an off-hook by the CPU control unit 28, the CPU control unit 28 converts the control information into a signal format that defines in advance using a predefined command indicating the off-hook, and then transmits the transmission line via the transceiver 27. Send to 13. The signal format used at this time is common to both the transmission line 13 and the control signal line 3, and the format is shown in FIG. A command such as the off-hook command is stored in the CMD43 of FIG. 3 and transmitted / received as control information. 38 and 39 are a priority and a source address for controlling the conflict at the time of control information CSMA / CD etc., 40 is a control information destination address, 41 is a control code indicating a command definition classification, and 42 is A byte counter indicating the data byte length of the CMD43, and 44 is an error control code used for error control of control information. When transmitting to the transmission path 13 via the transceiver 27, the destination address is transmitted at the address of the gateway 32, and the gateway 32 which has received the control information identifies the telephone control command and then the other The CPU control unit performs protocol conversion or the like to the control signal line 3 which is a transmission line and sends it to the main unit 2 via the transceiver 8 to notify the off-hook. At this time, the CPU control unit 11 performs speed conversion processing in addition to protocol conversion if necessary.
When the main unit 2 receives an off-hook from the telephone set 37 as control information from the control signal line, the state control of the telephone set inside the main unit 2 is started and thereafter the gateway 32 is relayed between the telephone set 37 and the main unit 2. The state transition of the telephone set 37 managed by the main unit 2 is controlled by transmitting and receiving control information by the main unit 2. Next, control is performed by adding 1 byte as an operand next to the command of the station line NO (LNO) selected as the telephone line designation command indicating that the station line selection has been pressed as a key input of the CPU control unit 28 of the telephone 37. After generating the information transmission format, the main unit 2 is notified in the same procedure as the off-hook command. As shown in FIG. 2, when the main unit 2 receives a telephone line designation after off-hook, the main unit 2 checks the usage state of the station line (telephone line) and the information signal line managed by the main unit, and selects it by the telephone line designation operand. If the designated requested station line is unused and any one of the information signal lines is unused, the main unit 2 relays the gateway 32 to the station 37 and transmits the station line use permission as control information. . The telephone set that has received the permission to use the station line displays a message indicating that the station line is being used. Further, following the transmission of the command for permission to use the station line, the command of information signal line connection is added with JNO as an operand in order to notify the telephone 37 of the line NO (JNO) of the unused information signal line from the main unit 2. Then, after relaying the gateway 32 and sending a notification to the telephone 37, the conversion circuit of the telephone line 1 built in the main unit 2 and the information signal line corresponding to JNO is turned on (closed). At this time, when the gateway 32 receives the information signal line connection command from the main unit 2, the gateway 32 confirms the use condition of the communication path used in the transmission path 13 of the gateway 32, that is, the up / down modulation frequency, and then performs the second call. Unused call modulation frequency channel in the channel NO
Capture (FNO). The gateway 32 captures the speech path used in the transmission line 13, and then turns on (closes) the cross point corresponding to the operand JNO of the information signal line connection command of the exchange circuit 9 to open the DC loop at the loop closing unit 30. Form for telephone lines. Furthermore, call line 10FNO
After turning on the carrier transmission of the CPU control unit 11, the telephone 3
The CPU control unit 11 of the gateway 32 sends a call path connection command for notifying the connection of the use-allowed call abbreviation to the 7, with FNO added to the operand. When the telephone 37 receives this command, the CPU controller 28 controls the switching circuit 26 for connecting the speech path permitted to use to the transmitter / receiver 29. Further, the CPU controller controls the call circuit 25 to turn on the designated call path. In this state, the telephone set 37 is physically connected to the telephone line 1 and the dial tone from the office line can be heard from the handset 29. After this, CP of telephone 37
When the dial NO input from the key input unit of the U control unit 28 is notified to the main unit 2 through the gateway 32, the main unit 2
The selection signal transmitting section built in the device transmits the selection signal to the telephone line 1.

As described above, it is possible to efficiently perform telephone control such as station line transmission from a telephone connected to a transmission line system different from that of the main device.

Effects of the Invention The present invention has the following effects.

1) There is no need to newly provide a separate main device for each different transmission line system unit. Therefore, the call control service can be commonly provided to a plurality of telephones connected to each different transmission line system in a bus-like manner by only one main unit.

2) Since it is possible to omit the call path control of the information signal at the time of controlling the extension call in the main device, it is possible to simplify the configuration of the main device and reduce the load of the call control process, and at the same time, the information signal. Only one line is required,
The use efficiency of the information signal line can be improved.

3) Since the gateway and the second telephone of the present invention have a modulator / demodulator that modulates and demodulates a baseband information signal, an extension line between the first and second telephones connected to a transmission path of a different medium. You can make calls.

4) A second telephone connected to a transmission line system different from the information signal line to which the first telephone of the present invention is connected is a subscriber telephone via a gateway having a loop closure and the information signal line. Since it can be connected to a line, it is possible to provide an outgoing call and an incoming call to the subscriber telephone line equivalent to the first telephone.

5) The main device can process the same telephone control without distinguishing between the first telephone connected to the information signal line and the second telephone connected to a different transmission line via the gateway. Therefore, the internal processing of the main device can be easily realized.

[Brief description of drawings]

FIG. 1 is a block diagram of a bus-type connected telephone control system according to an embodiment of the present invention, FIG. 2 is a diagram showing a communication sequence of the system, and FIG. 3 is control information for transmitting the communication sequence of FIG. FIG. 4 is a diagram showing a format, FIG. 4 is a configuration diagram of a conventional bus-type connected telephone control system, and FIG. 5 is a diagram showing a communication sequence of the system. 1 ... telephone line, 2 ... main unit, 3 ... control signal line,
4 to 6 ... Information signal line, 32 ... Gateway, 33,36,
37 ... phone.

Claims (1)

[Claims] 1. A first transmission line system having at least one information signal line for transmitting an information signal and a control signal line for transmitting a control signal as a logical coupling unit (composed of at least two or more twisted pair lines). A main device that accommodates at least one subscriber telephone line, performs a circuit exchange between the subscriber telephone line and the information signal line, and centrally controls the telephone call to the telephone; and the first transmission line. A first telephone which is connected to the system in a bus-like manner and whose call is controlled by the main device using the control signal line; and a second transmission line system (power line) whose medium is different from that of the first transmission line system. A second telephone connected to the first telephone by the main device and having the same call control function as the call control function provided to the first telephone; first The transmission line system and the second transmission line system are physically and logically coupled to each other, and a control signal having an address of the first or second telephone is received from the main unit to receive an information signal, A gateway for transparently controlling exchange between the first and second transmission line systems, wherein the gateway of the first transmission line system is line-connected to the subscriber telephone line by the main unit. It has a loop closure unit capable of forming a DC loop with respect to the information signal line, and the gateway and the second telephone have a modulation / demodulation unit for modulating and demodulating a baseband information signal as a communication circuit. As a result, a telephone system in which the main device is connected to and accommodated in either the first transmission path system or the second transmission path system performs equivalent call control and call control. Transmission path between the transmission connection type call control system.