JPH07105973B2 - Standby subscriber signal readout device in concentrator - Google Patents

Description

The present invention relates to an input device for a subscriber signal from each subscriber circuit in a concentrator of a duplexed digital exchange, and in particular, a subscriber signal can be input also on a standby concentrator side. With respect to the standby subscriber signal reading device as described above, the select signal output from the active line concentrator side is input to the standby line concentrator side in order to detect the subscriber signal indicating the state of the subscriber line. By synchronizing with the standby system, the subscriber signal, that is, the scan signal, can be taken into the standby system concentrator, and the subscriber lines from a plurality of subscriber circuits to which a plurality of telephones are connected are connected. By concentrating and controlling, and by sending a select signal to each of the subscriber circuits and returning the subscriber signal from each circuit accordingly. In a concentrator of a duplicated digital exchange that performs an operation of monitoring the status of the subscriber line and operates independently as an alternative, it is provided in each concentrator and serves as an alternative standby system. It operates on the concentrator side, and inputs the select signal output from the concentrator side which is the other operation system and synchronizes this with the operation timing of the standby system concentrator side to obtain the operation timing of the standby system concentrator side. A subscriber signal synchronizing means for pulling in the subscriber signal returned to the operation-system concentrator side in synchronization with the synchronized select signal to the standby-system concentrator side to monitor the state of the subscriber line is provided. To configure.

[Industrial application field]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber signal input device from each subscriber circuit in a concentrator of a duplexed digital exchange, and in particular, a standby join in which a subscriber signal can be input also on a standby concentrator side. Signal reading device.

[Conventional technology]

The concentrator part of the digital exchange is required to have a function of reliably performing backup in the event of a failure. The applicant of the present application, in a prior application (Japanese Patent Application No. Sho 61-182780), discloses a concentrator technology capable of reliably performing backup by duplicating the entire system of the concentrator control device and the subscriber concentrator. Disclosed.

FIG. 5 shows the configuration of the concentrator of the digital exchange.
First, the speech path (SP) 1 has subscriber circuits (SLC) 5-1 to 5-n to which a plurality of, for example, 120 telephones 4-1 to 4-n are connected in a one-to-one manner. , The same circuit is for each telephone 4-
The operation of converting an analog voice signal from 1 to 4-n into a digital voice signal or vice versa, and the call detection of each telephone are performed.

Next, the subscriber line concentrator (LC) 2 is a time division line concentrator switch (LTSW) 6, a subscriber circuit scanning memory device (SCNM) 7, a subscriber circuit control distribution memory device (SDM) 8, a line control memory (LCM). 9, a transmission / reception memory (SSM / RSM) 10, and a signal insertion / extraction circuit 11, which are “−1” and “−2” respectively.
It is duplicated as indicated by the number. Hereinafter, both are referred to unless otherwise specified.

LTSW6 is a subscriber line 18 from each SLC 5-1 to 5-n in SP1.
-1 to 18-n are concentrated, and the digital voice signal on the subscriber line is sent to a digital transmission line (highway) not shown in a time division manner (predetermined time slot) or received in reverse to receive each signal. It operates to distribute to subscriber lines.

SCNM7 sends each SLC5-1 through signal 16 to LTSW6 and signal 17.
Up-down (hook-on, hook-off) of the handset of telephones 4-1 to 4-n connected to ~ 5-n, dial information,
Also, the fault detection information and the like on the subscriber lines 18-1 to 18-n according to the present invention are monitored and notified to the line concentration control device (LPR) 3 (described later) via the processor bus 15.

The SDM8 is connected in the same manner as the SCNM7, and performs various controls of the SLCs 5-1 to 5-n according to the control from the LPR3.

The LCM9 receives information from the LPR3 which subscriber circuits 5-1 to 5-n are allocated to which time division time slot, and supplies the information to the LTSW6.

The SSM / RSM10 buffers various control information exchanged between the LTSW6 and the LPR3 via the D / I11.

Furthermore, the concentrator control device (LPR) 3 is a processor (MPU) 1
2, ROM memory 13, and RAM memory 14,
This part is also duplicated like each circuit of LC2.

MPU12 is LC2 via the concentration control program in ROM13.
Controls all circuits inside. At this time, various information with the LC2 is exchanged via the processor bus 15 and the RAM 14.

With the above configuration, all circuits of LC2 and LPR3 are duplicated, and either one of them operates independently by MPU 12-1 or 12-2 in LPR3. . Even if a failure occurs in one of the systems, it is possible to switch to the other system and continue the call service, thereby realizing a concentrator that can reliably perform backup.

[Problems to be solved by the invention]

In the conventional example shown in FIG. 5, each subscriber line 18-1 to 18-
n and subscriber circuits 5-1 to 5-n, the detection of the fault is carried out by the subscriber circuit scanning memory device (SCNM) as described above.
7 monitors the signal 17 via the signal 16 and LTSW6 and notifies the LPR3. In this case, for example, if LTSW 6-1 is operating, that is, if it is an active system, SCNM 7-1 monitors the above fault via signal 16-1, and via processor bus 15-1. Notify MPU12-1 in LPR3.
When a failure occurs, it is necessary to quickly transfer control to the standby LTSW 6-2 that was not operating. For that purpose, it is necessary to monitor the signal 17 even in the standby SCNM 7-2.
In such a case, if the two duplicated systems operate in synchronization, the signal 17 detected by the control of the active system can be monitored even in the SCNM of the standby system. When the systems are not operating in synchronization (for example, when operated as a remote concentrator), there is a problem that the signal 17 cannot be read by the SCNM of the standby system.

In order to solve the above problems, the present invention inputs a select signal output from the active line concentrator side to the standby line concentrator side in order to detect the subscriber signal indicating the state of the subscriber line. An object of the present invention is to provide a standby subscriber signal reading device in a concentrator that allows a subscriber signal to be taken into the standby concentrator by synchronizing with the standby system.

[Means for solving problems]

The basic configuration of the present invention for solving the above problems is the first
This is illustrated by the block diagram in the figure. That is, the subscriber circuit 20 is provided for each of a plurality of, for example, 120 telephones 19-1 to 19-n.
-1 to 20-n are connected, and the subscriber line 25 from the circuit is 2
The line is concentrated by either the concentrated line concentrator 21-1 or 21-2.

One of the concentrators 21-1 and 21-2 operates as an active system, and the other is a standby system for backup in the event of a failure. In particular, by concentrating the subscriber line 25 as described above. In addition to the operation of connecting to a digital transmission line (not shown), the active system concentrator outputs a select signal 23 to each of the subscriber circuits 20-1 to 20-n, and the subscribers returned from the circuit in accordance therewith. By returning the signal 24, the operation of monitoring the state of the subscriber line 25 is performed. Therefore, the concentrator 21-1 or 21-2
Is, for example, a time-division concentrator switch for concentrating, subscriber signal
It is realized by a memory device for scanning, and a processor that controls these.

Subscriber signal synchronizing means 22-1 and 22-2 are installed in the line concentrators 21-1 and 21-2, respectively, and the circuit operates on the standby system side and the select output from the active system line concentrator side. By inputting the signal 23 and synchronizing it with the operation timing of the standby system, the subscriber signal 24 is drawn into the line concentrator of the standby system to monitor the state of the subscriber line 25. The circuits 22-1 and 22-2 are realized by, for example, a flip-flop for synchronizing the select signal 23 with a standby system clock, a register for inputting the subscriber signal 24 according to the synchronizing signal, and the like.

[Action]

With the above configuration, the standby line concentrator 21-1 or
21-2 synchronizes the select signal 23 output from the active system in the subscriber signal synchronizing means 22-1 or 22-2 with its own system, thereby performing an operation of pulling the subscriber signal 24 into its own system. .

As a result, the state of the subscriber line 25 is detected even in the standby system.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail.

First, since the overall configuration of the concentrator of the digital exchange according to the present invention has the same configuration as the conventional example shown in FIG. 5, its details are omitted.

The present invention is based on the time division line concentration switch (LTSW) 6-1,
Regarding part 6-2. FIG. 2 shows the LTSW6− according to the present invention.
1 and 6-2 are shown. It should be noted that this drawing shows only the connection portion between the subscriber circuit scanning memory devices 7-1 and 7-2 via the signals 17 and signals 16-1 and 16-2 of FIG. 5 according to the present invention. Since the other parts are not related to the present invention, the configuration thereof will be omitted. In Fig. 2, first, each LTSW6−
The SCNse1 signal 30 is sent to the subscriber circuit (SL
C) The drivers 27-1, 27-2 and the SCN PCB se1 signal 31 for outputting to 5-1 to 5-n (Fig. 5) are SLC5-1 to SLC5-1.
5-n for output to each driver 28-1 and 28-2, and each driver 27-1 or 27-2 and 28-1 or 28-
2 operates only with the LTSW of the active system by each ACT / SBY signal 29-1 or 29-2, and SCN se only from the active system.
1 signal 30 and SCN PCB se1 signal 31 are output.

Next, a scan signal synchronizing circuit 26-1 or 26-2 is installed in each LTSW 6-1 or 6-2. Each circuit is AC
By inputting the T / SBY signal 29-1 or 29-2, in the case of an active system, the SCN signal 29 from SLC5-1 to 5-n (Fig. 5) is directly input to the signal 16-1 or 16-. 2 as subscriber circuit scanning memory device (SCNM) 7-1 or 7-2
Output to (Fig. 5), and in the case of standby system, input SCNse1 signal 30 and SCN PCB se1 signal 31 output from LTSW6-1 or 6-2 of active system and synchronize them with the clock of standby system. , By this, the SCN signal 29 is fetched in synchronization with the clock of the standby system, and the signal 16-1 or
Output as 16-2 to SCNM 7-1 or 7-2.

Next, FIG. 3 shows each scan signal synchronizing circuit 26-1 of FIG.
Or, it is a configuration diagram of 26-2 (both have the same configuration).
SCN output from active LTSW 6-1 or 6-2
se1 signal 30 and SCN PCB se1 signal 31 (see Fig. 3) are
Input to the input terminals D of flip-flops (hereinafter abbreviated as F / F) 32 and 35, respectively. Output a from output terminal Q of F / F32
Is input to the input terminal D of the F / F33, the output b from the output terminal Q of the F / F33 is input to the input terminal D of the F / F34, and the first input of the exclusive OR (EOR) 37 Input to the terminal. The output c from the output terminal Q of the F / F 34 is input to the second input terminal of the EOR 37. In addition, the standby terminal 2M (mega) Hz clock CLK2 is connected to the clock terminals CP of F / F32, 33, 34.
M to type. With these F / Fs 32 to 34, the SCN se1 signal 30 input from the active system is used as the standby system clock C.
Delayed after being synchronized to LK2M, EOR37, Inverter 3
A latch signal d having a width of 1 clock of the clock CLK2M is generated by 8.

The output from the output terminal Q of the F / F35 is input to the input terminal D of the F / F36. The clock CLK2M is input to the clock terminal CP of the F / F35, and the clock obtained by inverting the clock CLK2M by the inverter 39 is input to the clock terminal CP of the F / F36. The SCN PCB se1 signal 31 input from the active system by these F / Fs 35 and 36 is the standby system clock CLK2M.
Then, it is input to the clock terminal CP of the latch 41 as a latch signal f after being synchronized with the clock signal.

On the other hand, SCN signals 29 (second, fifth) from SLC5-1 to 5-n
Is input according to the latch signal d input from the input terminal D of the serial / parallel conversion circuit 40 to the block terminal CP of the circuit, and its 8-bit parallel output e is latched by the latch 41.
It is input and latched according to the latch signal f input from the input terminal PD of the same to the clock terminal CP of the same circuit. The 8-bit parallel output from the latch 41 is converted into serial data g according to the 512-KHz clock CLK512K of the standby system input from the input terminal PD of the parallel / serial conversion circuit 42 to the clock terminal CP of the circuit, and is output. By the serial / parallel conversion circuit 40, the latch 41, and the parallel / serial conversion circuit 42, the 8-bit unit SCN signal 29 is output as the output g after being synchronized with the standby system.

The selector 43 includes the scan signal synchronization circuit 26-1 or 26-2.
When the LTSW 6-1 or 6-2 (Figs. 2 and 5) that includes is included in the active system, the ACT / SBY signal 29-1 or 29-2 directly changes the SCN signal 29 to the signal 16-1 or 16-. 2 is output to SCNM 7-1 or 7-2 (Figs. 2 and 5), and in the case of standby system, ACT / SBY signal 29-1-1 or 29-
2, the output g obtained by synchronizing the SCN signal 29 with the standby system is output as the signal 16-1 or 16-2.

Regarding the operation of the scan signal synchronizing circuit shown in FIG.
This will be described with reference to the operation timing chart in the figure. First,
The SCN signal 29 from SLC5-1 to 5-n (Fig. 5) is the SCN se1 signal synchronized with the active system 2 MHz clock CLK2M.
The signals are input in 8-bit units of LP0 to LP7 in synchronization with the rising and falling edges of 30 (Figs. 4 (A) (B) (C)). At this time, the first 8 bits LPφ are input in synchronization with the rising edge of the SCN PCB se1 signal 31 in synchronization with the active system clock CLK2M. The SCN signal 29 input in this way is directly used as the signal 16-1 or 16-2 from the selector 43 (FIG. 3) in the active scan signal synchronizing circuit 26-1 or 26-2. 1 or 7-2
(Fig. 5).

On the other hand, the standby scan signal synchronization circuit 26
-1 or 26-2, the SCN se1 signal 30 is
Output a is obtained by synchronizing with standby system clock CLK2M by F / F32 in FIG. 3 ((C) and (D) in FIG. 4, t1).
(E)) Further, the output a is delayed by one clock by the F / F 33 ((F) in FIG. 4, t2). F / F32 and F / F33 are
This is a circuit for surely synchronizing the SCN se1 signal 30 with the standby system clock CLK2M.

Next, the output b is further delayed by one clock by the F / F 34, and the latch signal d is generated by the EOR 37 and the inverter 38 by the rising edge of the output b and the rising edge of the output c ((F) (G in FIG. 4, t2, t3). ) (H)).

As described above, the SCN se1 signal 30 of the active system is converted into the latch signal d synchronized with the clock CLK2M of the standby system, and the serial / parallel conversion circuit 40 which uses this as the clock converts the LP0 to LP7 of the SCN signal 29. 8 bits are fetched in synchronization with the standby system (Fig. 4, t3, t4, t5
Such).

Next, SCN PCB se1 signal indicating the beginning of active LP0
The latch signal f is generated by synchronizing and delaying 31 with the standby system clock CLK2M by the F / Fs 35 and 36 (FIG. 4 (J) (K)). As a result, as the output e, the signal L obtained by synchronizing the SCN signal 29 of the 7th bit
At the timing when P7 is obtained, the 8-bit parallel signal of LP0 to LP7 is latched by the latch 41 ((K) in FIG. 4 t7), and the parallel / serial conversion circuit 42 synchronizes with the rising of the standby system clock CLK512K. Output g
Is sequentially output from LP0 ((L) (M) at t8, t9, t10 in FIG. 4). As described above, the signal 16-1 or 16 output from the selector 43
The SCN signal obtained as -2 is synchronized with the standby system, and the standby system SCNM 7-1 or 7-2 in FIG.
It becomes possible to take in.

〔The invention's effect〕

According to the present invention, in a concentrator of a duplexed digital exchange that is not synchronized with each other, a subscriber signal (SCN signal) obtained by control of an active system can be taken in and monitored even in a standby system. Therefore, it is possible to detect the state of the subscriber line in the standby system, and it is possible to implement quick failure countermeasures.

[Brief description of drawings]

FIG. 1 is a block diagram of the present invention, FIG. 2 is a configuration diagram of a time division line concentrator switch according to the present invention, FIG. 3 is a configuration diagram of a scan signal synchronization circuit, and FIG. 4 is a scan signal synchronization circuit. An operation timing chart, FIG. 5 is an overall configuration diagram of a concentrator of the digital converter. 19-1 to 19-n ... Telephone, 20-1 to 20-n ... Subscriber circuit, 21-1, 21-2 ... Concentrator, 22-1, 22-2 ...
... subscriber signal synchronizing means, 23 ... select signal, 24 ... subscriber signal, 25 ... subscriber line.

Claims (5)

[Claims] A subscriber line (25) from a plurality of subscriber circuits (20-1 to n) to which a plurality of telephones (19-1 to n) are connected.
Operation for concentrating / controlling the subscriber line and each subscriber circuit (20-
1 to n) by sending a select signal (23) and returning the subscriber signal (24) from each circuit accordingly, the operation of monitoring the state of the subscriber line (25) is performed, and alternatively, In the concentrators (21-1, 2) of the duplexed digital exchange that operate independently, on the concentrator side that is provided in each of the concentrators (21-1, 2) and is alternatively a standby system It operates and synchronizes with the operation timing of the standby system concentrator by inputting the select signal (23) output from the concentrator of the other operation system and synchronizing it with the operation timing of the standby system concentrator. Subscriber signal synchronization for pulling in the subscriber signal (24) returned to the operation system concentrator side in synchronization with the selected signal to the standby system concentrator side and monitoring the state of the subscriber line (25) Characterized by having means (22-1, 2) Standby subscriber signal reading device in the concentrator. 2. The select signal input to the subscriber signal synchronizing means is a first select signal (30) for fetching the subscriber signal in 1-bit units and 8 bits of the subscriber signal. A standby subscriber signal reading device in a concentrator according to claim 1, characterized in that it comprises a second select signal (31) for identifying the fact. 3. The subscriber signal synchronizing means synchronizes the first select signal with a standby system clock by a flip-flop (32, 33, 34) and synchronizes the second select signal with the standby system clock. A standby subscriber signal reading device in a concentrator according to claim 2, characterized in that it has flip-flops (35, 36). 4. The subscriber signal synchronizing means comprises means (40, 41) for inputting a subscriber signal in 8-bit units in accordance with the first and second select signals synchronized with the standby system. A standby subscriber signal reading device in the concentrator according to claim 2. 5. The subscriber signal synchronizing means fetches the subscriber signal as it is on the concentrator side which is an operating system, and the output from the input means (40, 41) is a standby system on the concentrator side which is a standby system. 5. A waiting time in the concentrator according to claim 4, further comprising means (43) for switching so as to capture the output from the means (42) for converting into a subscriber signal synchronized with the operation timing on the side. Subscriber signal reading device.