JP3074129B2 - Remote line trunk device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote line trunk device installed at a location distant from the main unit of a private branch exchange, and more particularly, to a selection signal of a line corresponding unit housed in the remote line trunk device. It concerns control.

[0002]

[Prior Art] Private branch exchange ( Private Branch Excha)
nge ; PBX ), a remote line trunk device is installed . Far interval line trunk unit (RLTE)
It is, by dispersing established a line unit to a remote location, the remote line
The communication between the terminal housed in the trunk apparatus and the terminal housed in the private branch exchange body is realized. FIG.
It is a block diagram of a conventional private branch exchange main body and a remote line trunk device. 1 is a private branch exchange main body, 10 is an exchange main body central processing unit (hereinafter, referred to as CPU), 20 is a time-division switch (hereinafter, referred to as TSW), 30 is a line trunk device (hereinafter, referred to as a line trunk unit) accommodating a line-corresponding unit of the main unit. , LTE), 31 is a line trunk controller (hereinafter, referred to as HWC), 32-i (where i = 0 to n) is a line circuit,
Line interface, such as the trunk circuits (hereinafter, referred to as PP _i), 40 is a remote control device (hereinafter, referred to as CTL), 5
0 is a remote interface circuit (hereinafter referred to as INF). CPU10 has the function of performing allocation of time slots, control of the information, such as calling, closing processing of the failed PP _i 32-i and the like. TSW20 is CPU1
According to the time slot assigned by 0,
It has a function of connecting a communication path and transmitting transmission data to the communication paths 21 and 22. The HWC 31 has a function of performing polling control or the like of the PP _i 32-i in order to avoid contention for access. The CTL 40 has a function of notifying the CPU 10 of the failure information 41 and the like. INF50 is
It has a function of performing physical conversion for interfacing with the transmission path 60. 21 is HWC31 and TSW2
0, a communication path of 2 MHW × 5 in the uplink and downlink, 22 is a communication path of 2 MHW × 5 in the uplink and downlink, respectively, between the TSW 20 and the CTL 40, and 60 is a private branch exchange.
The transmission line 41 of 2 MTTC (TTC interface) × 5 between the main unit 1 and the remote line trunk device 70 in the upstream and downstream directions is failure information of the transmission line 60 transmitted from the CTL 40 to the CPU 10.

[0003] The control information such as the outgoing call of PP _i 32-i includes:
Between the CPU 10 and the HWC 31, transmission and reception are performed using a specific channel of the 2MHW 21, and the HWC 31 and the PP _i 32-i
Are transmitted by the control bus PPBUS in the LTE 30. The control method between the HWC and the PP is such that in order to avoid contention for access, the HWC 31 sends a selection signal PPSEL _i to each PP _i 32-i, and the PP _i 32-i given the selection signal PPSEL _i Control bus, data bus PPBU
Communication with the HWC 31 via S (for example, PP _i 32-
(i.e., access to a shared memory for transmission and reception provided for each i). By the selection signal PPSEL _i, HWC
In accordance with the control information sent from the CPU 10, the controller 31 selects PP _i 32-i at a fixed period to avoid contention,
When the selection signal PPSEL _i is received, the corresponding PP _i 32-
i, the failure is determined. If there is no response for a certain period of time, it is determined that PP _i 32-i has a failure.
Blocking processing in which no time slot is assigned to _Pi 32-i is performed. 70 is a remote line trunk device connected to the private branch exchange body 1 by a transmission line 60, 80 is INF, 90 is CTL, 100 is HWC,
110-i is line circuit housed in a remote in-line trunk unit, a PP _i such trunk circuit. The remote line trunk device 70 is provided between the CPU 10 and the HWC 31.
The MHW is configured to be directly extended, the CTL 90 functions as a layer 2 for transmitting / receiving a control signal (such as a transmission line failure) to / from the transmission line, and the INF 80 performs a physical signal conversion suitable for the interface in the layer 1 Serve as a function. For example, when the transmission path 60 is 2MTTC, 5 lines of 2MTTC are used and the remote line trunk is used.
HWC100, PP _{i 110-i} and the control information in the device,
Sends and receives communication data. With any one of the transmission lines 60
A certain first transmission line is connected to a plurality of arbitrary line corresponding units (for example,
_{If, PP i ~PP j) 110-} i~110-j ( where,
0 ≦ i, j <n).
Assigned to the first transmission line and different from the first transmission line.
The transmission line 2 is an arbitrary plurality of line corresponding units (for example, PP
_{k ~PP l) 110-k~110-} l ( however, i, j ≠
k, l, 0 ≦ k, l <n)
Is assigned in advance.

[0004]

However, the conventional remote line trunk device 70 has the following problems. CPU 10 to HWC 100, PP _i 11
Communication of control data to 0-i is performed using a specific channel of 2 MHW because the amount of data is small, and communication data uses a channel other than control data of 2 MHW. For example, if the transmission path 60 is 2MTTC × 5, 2
Communication data on all channels of MTTC0-3, 2MT
Communication data on channels 1 to 23 of TC4, 2MTTC4
, Control data is allocated to the 24th to 31st channels. For communication data, 8 channels or 16 channels are allocated as one time slot for each PP _i 110-i. Here, of the 2MTTC × 5 transmission paths 60 , 2MTTC4 transmitting control data
When a transmission path other than the above fails, communication data of the PP _i to which a time slot corresponding to the transmission path is allocated is not transmitted, but control data is transmitted.

[0005] Control information such as calling, dialing, and terminating of a terminal of PP _i (for example, a subscriber circuit) is transmitted to the CPU 10 and H
It is transmitted to the PP _i via the WC 31 or 100.
In other words, even if the terminal of PP _i 110-i of the remote line trunk device a call, the transmission path of the communication data corresponding to the PP _i 110-i is a failure, dial tone (D
(T sound) is not. In addition, a ringing ring sounds at the terminal, and a response can be made. Conventionally, to prevent this,
The INF 50 checks whether or not a fault has occurred every 2MTTC × 5 (in both up and down directions), and notifies the CPU 10 of the fault information 41 via the CTL 40. Then, the CPU 10, to operate the dedicated software to respond to a transmission line fault, the corresponding PP _i
In order not to send the selection signal PPSEL _i to 110-i,
By controlling the H W C100, it has been performed the process for closing the PP _i software manner. That is, the CPU 10
In addition to blocking process of failure of _{PP i 32-i, 110-} i, when the transmission line 60 characteristic fails to remote line trunk unit 70, the remote line trunk for closing the corresponding PP _i 110-i It was necessary to prepare dedicated software specific to the device 70 to close the PP _i 110-i.

[0006]

To solve the previous SL problems SUMMARY OF THE INVENTION The present invention provides fault notified PP _i (where, i = 0 to
Private branch exchange having a CPU that performs blocking control for n)
The private branch exchange main unit is installed at a location away from the main unit.
Remote line connected to the first transmission line and the second transmission line.
The first transmission line and the second transmission line.
2 is connected to the second transmission line, and the failure of the first transmission line is detected.
Output first failure information when the second transmission
Outputs second fault information when a road fault is detected
An interface circuit and a circuit corresponding to the first transmission line.
From a plurality of the above-mentioned PP _j (where 0 ≦ j <n).
When the first selection signal is input, the PP _j itself is
A first line for outputting a first response signal when there is no failure
A corresponding unit group and a plurality of units provided corresponding to the second transmission path.
A number of said PP _k (where 0 ≦ k ≦ j or j <k <n)
When the second selection signal is input, the PP _k
A second response signal that outputs a second response signal when there is no failure in itself.
Line corresponding unit group and a case where the first failure information is input.
The first selection signal to the first line corresponding unit group
Is interrupted and the second fault information is input
The second selection signal to the second line corresponding unit group
CTL for cutting off the output and when the first response signal is constant
Input to the CPU when the first line pair
It is considered that the response group has a fault, and the
And the second response signal is not input for a certain period of time
In the case, the CPU has a fault in the second line corresponding unit group.
HWC that notifies the CPU of the failure assuming that there is
And

[0007]

According to the present invention, since the remote line trunk device is configured as described above, for example, a failure occurs in the first transmission line.
If there is no, the first selection signal enters the first line corresponding unit group.
The first line-corresponding module group itself has no fault.
, A first response signal is output and sent to the HWC. This
On the other hand, if a failure occurs in the first transmission line, this
Interface circuit, and outputs first fault information.
Sent to the CTL. In the CTL, the first line corresponding unit group
The output of the first selection signal to is shut off. Therefore, the first
The first response signal is not output from the
HWC considers that the first
A failure notification is sent to the CPU. This allows the CPU
Closes the first line corresponding unit group.

[0008]

FIG. 1 is a block diagram showing a private branch exchange main unit and a remote line trunk unit according to an embodiment of the present invention .
The elements common to those in 2 have been given common reference numerals
You. The difference between the remote line trunk device 70A of this embodiment and the conventional remote line trunk device 70 is that the HWC 13
0 to output a selection signal PPSEL _i to the CTL 120;
When a failure occurs in the transmission line 60 due to the CTL 120, the selection signal S is sent to the PP _i 110-i corresponding to the transmission line 60.
Gate control is performed so as not to output EL _i , and the selection signal SEL _i is closed by hardware, and PP _i 1
That is, the CPU 10 performs a normal blocking process at the time of failure of the PP _i 110-i by regarding the failure as 10-i itself. As shown in FIG. 1, the remote line trunk device 70A is connected to an INF 80 by a transmission line 60 of 2MTTC × 5 in each of uplink and downlink. INF
A communication path of 2 MHW × 5 is connected between 80 and the CTL 120. CTL120 has 2M more than INF80
Failure information HWALM for each transmission line of TTC is input, and H
Select signal PPSEL of PP _i 110-i from WC130
_i is entered. In the present embodiment, as an example, the transmission path 6
A 2MTTC × 5 of 0 is described as a configuration in which communication data is allocated to all channels of 2MTTC0 to 3 and communication data is allocated to channels 1 to 23 of 2MTTC4 and control data is allocated to channels 24 to 31 of 2MTTC4.

[0009] Figure 3 is a circuit diagram for gating the selection signal in CTL120 in FIG. As shown in FIG. 3, this circuit includes switch circuits SW ₀ -0 to SW ₀ -i ₀ , S
W ₁ −0 to SW ₁ −i ₁ , SW ₂ −0 to SW ₂ −i ₂ ,
Has a SW ₃ -0~SW ₃ -i _3. Each of the switch circuits SW _j -0~SW _j -i _j (where, j = 0 to 3), the
2MTTCi of the transmission line 60 (where, i = 0 to 3) each provided for the corresponding PP _i 110-i, the ON / OFF control control electrode for inputting a control signal to the first electrode second Electrodes. Switch circuit SW _j −
Each control electrode of 0~SW _j -i _j, 2MT for each transmission path
The fault information HWALM _i ( where i = 0 to 3) of TC i is input, and the selection signal P is applied to the first electrode.
PSEL _i is input, and the selection signal SEL is input from the second electrode.
_i is output to PP _i 110-i .
For 2MTTC4 used to transmit control information for the PP _i 110-i corresponding to the transmission path 60, the selection signal PPSEL _i after being entered once CTL120, it selects signal PP _i 110-i SE
It has a configuration which is output as L _i.

The operations (a) and (b) of the private branch exchange main unit 1 and the remote line trunk device 70A shown in FIG. 1 will be described below.
You. (A) When arriving at the remote line trunk unit 70A side of PP _i 32-i of the PBX body 1, the control information of the calling and dialing, HWC3 1, TSW20, CPU
10 is transmitted. The CPU 10 performs processing for the calling side and the receiving side, and transmits the control information to the calling side and the receiving side. For the called party, the PP for which the incoming call was specified
_i 110-i blockage (clogging due to blockage or failure of the PP _i 110-i itself due to the failure of the transmission line to be described later)
If Re cry is, the control information from the CPU10 is transmitted, control information is TSW20, CTL40, INF5
0, transmission line 60, I in remote line trunk device 70A
It is received by the HWC 130 via the NF 80 and the CTL 120. HW in remote line trunk device 70A
In C130, based on an instruction from the CPU 10, and outputs a selection signal PPSEL _i periodically to CTL120. On the other hand, in the INF 80, the monitoring circuit constantly monitors whether a predetermined code of the 2MTTC interface received from the transmission line 60 is set at a predetermined position (for example, SMF is set to time slots 0 and 16). And 2MTTC0 to 2MT for each of the uplink and downlink.
For TC3, the fault information HWALM _i is stored in CTL120.
Output to The switch circuit SW _j -0~SW _j -i _j in FIG. 3 in CTL120, therefore the fault information HWALM _i input to the control electrode, 2M
If there is a fault in TTC i , the switch turns off, and if there is no fault, it turns on. Therefore, when the corresponding 2MTTC i is <br/> disorders not output the selection signal SEL _i is the PP _i 110-i, if there is no fault, the switch circuit SW _j -0
To SW _j -i _j respectively.
L _i is output from the second electrode, the selection signal SEL _i is output to the PP _{i 110-i.} Faulty transmission path 2
The PP _i 110-i corresponding to MTTC i, not output the selection signal SEL _i, in HWC130, PP _i 11
Since there is no response from 0-i for a certain period of time, the PP _i 110-
The i determines that failed, using a channel for transmitting control information 2MTTC4, relative to CPU 10, and notifies the PP _i failure <br/>.

[0011] In CPU 10, by operating the same application as in the case of PP _i disorders ordinary LTE30 mounted, fixed time, the select signal P relative to the PP _i 110-i
Blocking processing such as not giving PSEL _i is performed by software. Therefore, the ringer does not ring at the PP _i 110-i . On the other hand, for the PP _i 110-i that uses the transmission line 60 having no failure, the selection signal SEL is used.
Given _i, the incoming signal received by the HWC 130 is received, and ringing of the incoming ringer, a telephone call, and the like are performed.
Further, the CPU 10, to failure of the PP _i 110-i to check whether it has been restored for HWC130, after a certain time after the occlusion, an instruction to output a selection signal SEL _i. In HWC130, in accordance with instructions from the CPU 10, the selection signal PPSEL _i CTL1
Output to 20. Then, if the transmission path 60 corresponding is restored, the selection signal SEL _i is PP _i 110-i
Is output to the terminal and a call can be made. Also, 2MTTC4
For the corresponding PP _i 110-i, the not a switch circuit, 2MTTC4 because the channel is assigned to transmit control information to, 2MTTC4
If a failure occurs, the remote line trunk device 70
A needs to be occluded, so each PP _i 110-i
This is because there is no need to close the. By the way, CPU1
0, the fault information 41 of the transmission path 60 is transmitted from the CTL 40 as in the conventional case, and this fault information 41 is notified to the user (for example, output to a screen, a printer, etc.), and Used to promote recovery, individual PP
Not used for occlusion of _i 110-i.

(B) Calling with PP _i 110-i on remote line trunk device 70A side Remote line trunk device
When trying to place a call on PP _i 110-i on the side of device 70A ,
As described above, if there is a failure in the transmission line 60 corresponding to the PP _i 110-i , the switch circuit is turned off.
The selection signal SEL _i is not applied to PP _i 110-i,
_i 110-i is closed. Therefore, even if an attempt is made to make a call, the call cannot be made and a DT sound does not occur. When the failure of the transmission path 60 is recovered, PP _i 1
Selection signal SEL _i to 10-i becomes Ataeraru so, P
At _Pi 110-i, a call becomes possible. As described above, according to the present embodiment, the remote line trunk device 70
Subscriber terminal according to transmission line fault specific to A, closing processing trunk, by closing the hard-selection signal PPSEL _i, the same application and PP _i disorders LTE30 mounting of conventional PBX body 1 Therefore, the blocking process can be performed without preparing dedicated application software specific to the remote line trunk device 70A . The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, there are the following modifications.

(1) Although the case where the transmission line 60 is a 2MTTC interface has been described as an example, another interface may be used, and the number of transmission lines 60 may be two or more instead of five. (2) selection signal PPSEL _i from HWC130 CT
L120, and the CTL 120 outputs a selection signal PPS.
Although the gate control of EL _i is performed, the gate control may be performed by outputting the selection signal PPSEL _i to another circuit (for example, to the INF 80). (3) If the switch circuit SW _j -0~SW _j -i _j intended to be gated, the relay switch, MOS,
It may be any material such as a bipolar transistor, or may be gate circuit Tsu Der.

[0014]

As described [Effect Invention above in detail, according to the present invention, the CTL, the selection No.択信in response to a failure of the transmission path
Since so as to cut off the output is not output selection No.択信the met line interface unit of transmission line fault, normal private branch exchange
Implemented using PP _i disorder same and application of LTE mounted in the machine body. Therefore , the closing process can be performed without preparing dedicated application software specific to the remote line trunk device .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a private branch exchange main unit and a remote line trunk device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional private branch exchange main body and a remote line trunk device.

FIG. 3 is a circuit diagram for gate-controlling a selection signal in a CTL 120 of FIG. 1 ;

DESCRIPTION OF SYMBOLS 1 configuration
Internal exchange body 10 C
PU 20 T
SW 30 L
TE 31,130 H
WC 32-i, 110-i P
P _i 40,120 C
TL 50,80 I
N F 6 0 transmission line 70A far
Remote line trunk device HWALM failure
Harm information PPSEL _i , SEL _i selection signal

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04Q 3/42-3/42 107 H04Q 3/58-3/62 H04M 3/22-3/36

Claims (1)

(57) [Claims] 1. Blocking of a line responding unit notified of a failure
Move away from the private branch exchange that has the central processing unit that controls
And the first transfer to the private branch exchange body.
Remote line trunk connected by transmission line and second transmission line
An apparatus connected to the first transmission path and the second transmission path,
When a failure in the first transmission line is detected, the first failure information
Information is output, and a failure in the second transmission path is detected.
An interface circuit for outputting second failure information, and a plurality of lines provided corresponding to the first transmission line.
The first selection signal is inputted,
Outputs the first response signal when there is no failure in the line handling unit itself.
And a plurality of lines provided corresponding to the second transmission line.
The second selection signal is inputted when the second selection signal is inputted.
Outputs a second response signal when there is no failure in the line handling unit itself.
When the second failure handling information is input and the first failure information is input, the first
Shuts off the output of the first selection signal to the line corresponding unit group,
When the second fault information is input, the second line
A remote unit that cuts off the output of the second selection signal to the corresponding unit group
If the control device and the first response signal are not input for a certain period of time,
The central processing unit has a fault in the first line corresponding unit group.
The central processing unit is notified of the failure and
If the second response signal is not input for a certain period of time,
If there is a failure in the second line corresponding unit group to the central processing unit
A line for notifying the central processing unit of the failure notification
And a trunk control device.