JPH05236137A - Line control system - Google Patents

Abstract

PURPOSE:To set simultaneously control informations to each branch station exchange, to allow each branch station exchange to quickly detect a fault of the control information and to set the exchange again with respect to the line control system in the exchange network in which the use of a communication line interconnecting a control station exchange with plural branch station exchanges, is regulated by a control board. CONSTITUTION:A control station exchange 1 is provided with a simultaneous transmission means 100 sending simultaneously control information tc regulating the use of a communication line 3 and applied from a control board 14 to all branch station exchanges 2 via each communication line 3, and each branch station exchange 2 is provided with a latch means 201 latching the control information tc sent from the control station exchange 1 in parallel with the branch station exchange 2 and with a collation means 202 collating the control information tc latched by the support station exchange 2 with the control information tc latched by the latch means 201 and making a request of retransmission of the control information tc to the control station exchange 1 via the communication line 3 when dissidence is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line control system in a switching network in which the use of a communication line connecting a control center exchange and a plurality of branch exchanges is controlled by a control stand.

[0002] For example, in a disaster prevention communication system on a prefecture basis, a control station switch installed in the prefectural office and a branch office switch installed in each branch in the prefecture are connected by a communication line,
Normally, each communication line is used for general communication between the control center switch and each branch office switch, but in the event of a disaster etc., ensure emergency communication between the control center switch and each branch office switch. Therefore, it becomes necessary to regulate the use of the communication line for general communication.

[0003]

2. Description of the Related Art FIG. 3 is a diagram showing an example of a conventional switching network. In FIG. 3, for example, a control station exchange 1 installed in a prefectural office and branch station exchanges 2 respectively installed in a plurality of branches (individual branch exchanges are referred to as 2-i (where i is 1 to n), The same] is connected by the communication line 3.

In FIG. 3, only the structure of a specific branch office switch 2-1 is shown, and the structures of other branch office switches (for example, 2-n) are omitted. The control station exchange 1
When the control information (tc) for restricting the use of the communication line 3 is not set in the main memory device (MM) 13, a call to any branch office switch 2-i occurring in the control office switch 1 is made. In contrast, the communication line 3-i is unconditionally used to set up the call.

Each branch office switch 2 also has a main memory (M
M) In the state where the control information (tc) is not set in the control station exchange 1, the control station exchange 1 addressed to the control station exchange 1,
Alternatively, for a call to another branch office switch 2, the communication line 3 is unconditionally used to set up the call.

When it is necessary to secure emergency communication in such a switching network, a call is made from the control base (TCB) 14 installed in the control center exchange 1, and the call is made to the control center exchange 1 and each branch office exchange 2. Communication line 3 for general communication
The control information (tc) for restricting the use of the control station is input to the control center exchange 1 by, for example, a push button dial signal (hereinafter referred to as a PB signal).

The control information (tc) input from the control board (TCB) 14 is shared by the control center exchange 1 and each branch exchange 2. When the central control unit (CC) 12 of the control center exchange 1 detects a call from the control console (TCB) 14, it controls the network (NW) 11 to control the control console (TCB) 14 and PB receiver (REC). 16 and the PB signal input from the control stand (TCB) 14 is subsequently received and analyzed via the PB receiver (REC) 16 and identified as control information (tc), the main memory (M)
M) Control information (tc) is stored in a predetermined area in 13.

Subsequently, the central controller (CC) 12 captures the communication line 3-1 via the trunk (TRK) 15-1 accommodating the communication line 3-1 to the branch office exchange 2-1. In addition to making an outgoing connection, it controls the network (NW) 11 to control the PB transmitter (SND) 17 and the trunk (TR).
K) 15-1 and the control information (tc) is transmitted to the PB transmitter (SND) 17 so that the control information (tc)
c) is transmitted by the PB signal to the branch office exchange 2-1 via the communication line 3-1.

In the branch office switch 2-1, when the central controller (CC) 22 detects an incoming call from the communication line 3-1 via the trunk (TRK) 24, it controls the network (NW) 21. Trunk (TRK) 24 and PB
A receiver (REC) 25 is connected, and then a PB signal transmitted from the control center exchange 1 via the communication line 3-1 is received and analyzed via the PB receiver (REC) 25, and control information is received. When it is identified as (tc), the control information (tc) is stored in a predetermined area in the main storage device (MM) 23.

When the control station exchange 1 completes the control information (tc) setting process for the branch exchange 2-1 and the other branch office exchanges 2-i, the control information (tc) is set in the same procedure. Are set in sequence.

In the control center exchange 1, when the central control unit (CC) 12 detects a call to any branch office switch 2-i, it analyzes the call type and identifies it as a general communication.
Then, referring to a predetermined area in the main memory (MM) 13,
It is analyzed whether the control information (tc) is set, and when it is detected that the control information (tc) is set, the capture of the communication line 3-i is prohibited, and the branch office exchange 2 of the call concerned is prohibited.
-Control calls to i.

Also in each branch office switch 2-i, when the central controller (CC) 22 detects a call to the control center switch 1 or another branch office switch 2, the call type is analyzed and general communication is performed. Main memory (MM)
Reference is made to a predetermined area in 13 to analyze whether or not the control information (tc) is set. When it is detected that the control information (tc) is set, the capture of the communication line 3-i is prohibited. , The control center exchange 1 or another branch exchange 2 for the call
Restrict calls to the.

In any branch office switch 2-i,
When the main memory device (MM) 23 is initialized due to a failure of the main memory device (MM) 23 and the stored control information (tc) disappears, the branch office exchange 2-
The maintenance person of i detects the disappearance of the control information (tc), and by some communication means, the control console (TCB) of the control center exchange 1
14 is requested to reset the control information (tc).

The control console (TCB) 14 requested to reset the control information (tc) resets the control information (tc) to the control station exchange 1 and each branch office exchange 2 by the same procedure as described above. Run.

[0015]

As is clear from the above description, in the conventional switching network, the control information (tc) that the control station exchange 1 is input from the control console (TCB) 14 is provided.
Is transmitted to only one branch office exchange 2 at a time to set the control information, and after the control information (tc) for the one branch office exchange 2 is set, the control information (tc) is sent to the next branch office exchange 2. ) Has been executed, it takes a long time to finish setting the control information (tc) for all branch office exchanges 2, while the communication line 3 is secured for emergency communication. Even if the control information (tc) set in any branch office switch 2-i disappears due to a failure, etc., the maintenance person of the branch office switch 2-i detects the disappearance of the control information (tc). The control station (TCB) 14 of the control center exchange 1
If the user does not request the resetting, the communication line 3-i is restricted, and there is a problem that it will pass for a while.

An object of the present invention is to make it possible to set control information to all branch office exchanges at the same time, and to detect abnormalities in control information in each branch office exchange as quickly as possible and reset them. To do.

[0017]

FIG. 1 is a diagram showing the principle of the present invention. In FIG. 1, 1 is a control center exchange, 2 is a branch exchange, 3 is a communication line connecting the control exchange 1 and each branch exchange 2, and 14 is a control board installed in the control exchange 1.

Reference numeral 100 is a broadcasting means provided in the control center exchange 1 according to the present invention. 201 is a holding means provided in each branch exchange 2 according to the present invention. 20
Reference numeral 2 is a collating means provided in each branch office exchange 2 according to the present invention.

[0019]

The broadcasting means 100 sends control information tc, which is input from the control stand 14 and controls each branch office switch 2 to restrict the use of the communication line 3, to all branch office switches via each communication line 3. Send to 2 all at once.

The holding means 201 holds the control information tc transmitted from the control center exchange 1 in parallel with the branch office exchange 2. The collating means 202 has the control information tc held by the branch exchange 2 and the control information t held by the holding means 201.
When it is checked with c and a mismatch is detected in the check result, the control station exchange 1 is requested to retransmit the control information tc via the communication line 3.

Therefore, all branch office exchanges receive and set the control information all at once, and the use of all communication lines in the exchange network is simultaneously restricted, and each branch office exchange also. Since an abnormality that occurs in the control information that has already been set up is automatically detected and the control station exchange is automatically requested to reset, emergency communication in the exchange network is surely secured.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a switching network according to an embodiment of the present invention. The same reference numerals denote the same objects throughout the drawings.

In FIG. 2, a control station control device (MTC) 18 is provided in the control station exchange 1 as the simultaneous transmission means 100 in FIG. 1, and a holding section (HLD) 271 is provided as the holding means 201 in FIG. Further, each branch office switch 2 is provided with a branch office controller (BTC) 27 having a matching part (MCH) 272 as the matching means 202 in FIG.

Also in FIG. 2, only the structure of a specific branch office switch 2-1 is shown, and the structures of other branch office switches (eg 2-n) are omitted. When it is necessary to secure emergency communication in the switching network shown in FIG. 2, a call is made from the control console (TCB) 14 installed in the control center exchange 1,
Control information (tc) for restricting the use of the communication line 3 for general communication occurring in the control center exchange 1 and each branch exchange 2 is input to the control center exchange 1 by a PB signal.

Central control unit (CC) 1 of the control center exchange 1
2 detects the call from the control console (TCB) 14,
Control station (TCB) by controlling network (NW) 11
14 and the PB receiver (REC) 16 are connected, and subsequently, the PB signal input from the control stand (TCB) 14 is received and analyzed via the PB receiver (REC) 16, and the control information (t
When identified as c), the control information (tc) is stored in a predetermined area in the main memory device (MM) 13.

Subsequently, the central controller (CC) 12 controls the network (NW) 11 to control the PB transmitter (SND).
17 and the control station control device (MTC) 18 are connected to each other, and the control information (tc) is transmitted to the PB transmitter (SND) 17, so that the control information (tc) is transmitted to the network (NW) 11 by the PB signal. Control station controller (MTC)
18 is transmitted.

When the control information (tc) transmitted from the PB transmitter (SND) 17 by the PB signal is received by the PB receiver (REC) 181, the control station control device (MTC) 18 receives all the communication lines. The central control unit (CC) 12 is requested to make outgoing connections to all the 3-1 to 3-n simultaneously.

The central control unit (CC) 12 which has received the outgoing connection request from the control station control unit (MTC) 18 has each trunk (TR) accommodating each communication line 3-1 to 3-n.
K) The communication lines 3-1 to 3-n are captured via 15-1 to 15-n, and outgoing connections are made to the branch exchanges 2-1 to 2-n, and the network (NW) 11 is connected. The control station controller (MTC) 18 is connected to each trunk (TRK) 15-1 to 15-n by controlling.

The control station control unit (MTC) 18 controls the control information (tc) transmitted from the central control unit (CC) 12.
Is converted into a PB signal by the PB transmitter (SND) 182, and is transmitted to all the communication lines 3-1 to 3-n connected via the network (NW) 11 all at once.

In the branch office switch 2-1, when the central controller (CC) 22 detects an incoming call from the communication line 3-1 via the trunk (TRK) 24, it controls the network (NW) 21. Trunk (TRK) 24 and PB
The receiver (REC) 25 is connected, and the trunk (TRK) 24 and the holding unit (HLD) 271 in the branch office controller (BTC) 27 are connected.

Subsequently, the central control unit (CC) 22 receives the P transmitted from the control center exchange 1 via the communication line 3-1.
The B signal is received and analyzed via the network (NW) 21 and the PB receiver (REC) 25, and the control information (t
When identified as c), the control information (tc) is stored in a predetermined area in the main memory device (MM) 23.

On the other hand, the holding unit (HLD) 271 has a PB signal receiving function similarly to the PB receiver (REC) 25, and is transmitted from the control center exchange 1 via the communication line 3-1. When the PB signal is received and analyzed via the network (NW) 21 and is discriminated from the control information (tc), it is held in the branch office controller (BTC) 27.

The central controller (CC) 22 monitors the control information (tc) stored in a predetermined area in the main memory (MM) 23 and controls the branch office via the signal distributor (SD) 26. The control setting information (c
Communicate as i).

The collating unit (MCH) 272 in the branch office control unit (BTC) 27 has the control information (tc) held by the holding unit (HLD) 271 and the central control unit (CC) 2.
3 is compared with the control setting information (ci) transmitted via the signal distribution device (SD) 26, and when it is determined that the two match, the data is stored in a predetermined area in the main memory device (MM) 23. Check the normality of the control information (tc) that has been set.

In the other branch office exchanges 2-2 to 2-n as well, in the same process as in the branch office exchange 2-1 the control information (t) transmitted from the control office exchange 1 simultaneously.
c) is stored in a predetermined area in the main memory (MM) 23 and is held in the branch office controller (BTC) 27,
In addition, the collation unit (MC) in the branch office controller (BTC) 27
H) 272 is control information (tc) held in the branch office controller (BTC) 27, and control setting information (ci) transmitted from the central controller (CC) 23 via the signal distributor (SD) 26. ) And the normality of the control information (tc) stored in the predetermined area in the main memory device (MM) 23.

As described above, the control information (tc) is stored in the predetermined area in the main memory device (MM) 13 in the control center exchange 1, and the control information (tc) is stored in each branch exchange 2-1 to 2-n. tc) are simultaneously stored in a predetermined area in each main memory device (MM) 13 and 23-1 to 23-n, the communication lines 3-1 to 3-n for general communication are processed by the same process as described above. The use of is regulated.

In such a state, an arbitrary branch office exchange 2-i
In the above, if the main memory device (MM) 23 is initialized and the stored control information (tc) disappears due to a failure of the main memory device (MM) 23 or the like, the central controller (CC) 22 The control setting information (ci) set in the branch office controller (BTC) 27 via the signal distributor (SD) 26 disappears.

Control information (tc) and control setting information (ci)
When the collation unit (MCH) 272 that collates with each other detects a mismatch in the collation result due to the disappearance of the control setting information (ci), it communicates with the central controller (CC) 22 via the communication line 3-i.
Requesting an outgoing connection to.

The central control unit (CC) 22 which has received the outgoing connection request from the branch office control unit (BTC) 27 connects the communication line 3-i via the trunk (TRK) 24 accommodating the communication line 3-i. It captures and makes outgoing connection to the control center exchange 1, and also controls the network (NW) 21 to control the branch office controller (BTC) 27 and the trunk (TRK) 2.
Connect with 4.

The collating unit (MCH) 272 in the branch office controller (BTC) 27 converts the control information (tc) reset request into a PB signal, and is connected via the network (NW) 21. Send to line 3-i.

In the control center exchange 1, when the central control device (CC) 12 detects an incoming call from the communication line 3-i via the trunk (TRK) 15-i, it controls the network (NW) 21. The trunk (TRK) 15-i and the PB receiver (REC) 16 are connected to each other, and then the PB signal arriving from the communication line 3-i is transferred to the PB receiver (REC).
If the control information (tc) is received and analyzed via 16 and is identified as a control information (tc) reset request, the control information (tc) reset processing for each branch office switch 2-1 to 2-n is performed by the same procedure as described above. To execute.

In the branch office exchange 2-i, normal control information (tc) is stored in a predetermined area in the main memory (MM) 23 by the control information reset processing executed by the control office exchange 1. It is stored again, and as a result, the normal control setting information (ci) is also transmitted to the branch office controller (BTC) 27, and the collating unit (MCH) 272 is held in the branch office controller (BTC) 27. The normality of the control information (tc) stored in the main memory device (MM) 23 is confirmed by collating the control information (tc) stored therein with the control setting information (ci).

As is clear from the above description, according to this embodiment, the control information (tc) input from the control console (TCB) 14 is transferred from the control station control device (MTC) 18 to each communication line 3-1. Through 3-n all branch office switches 2
-1 to 2-n are sent to all branch office switches 2-
Main memory device (MM) 23 in parallel in 1 to 2-n
Since it is stored in a predetermined area in the branch office, the branch office exchanges 2-1 to 2-n simultaneously start restricting the use of the communication lines 3-1 to 3-n for general communication. Will be ensured. In addition, each branch office switch 2-
The normality of the control information (tc) stored in the main memory device (MM) 23 of i is constantly monitored by the collating unit (MCH) 272, and when an abnormality occurs in the control information (tc), the control information is immediately controlled. Since the control information (tc) reset request is transmitted to the central office exchange 1, and the control information (tc) reset processing is immediately executed from the central office exchange 1, the control information (tc) in which the abnormality has occurred is detected. It will be repaired automatically and quickly.

It is to be noted that FIG. 2 is merely an embodiment of the present invention, and the control information (tc) is not limited to the one for uniformly controlling general communication, and the general communication is given priority. Many other modifications are considered, such as limiting the regulation range, but the effect of the present invention does not change in any case. The broadcast means 100 is not limited to the control station control unit (MTC) 18 shown in the figure. For example, when the control station exchange 1 is a time division exchange, the distribution function of the network (NW) 11 is used. Each branch office switch 2-
Send control information (tc) to 1 to 2-n all at once,
Many other modifications can be considered, but in any case, the effect of the present invention does not change. Further, the control station exchange 1 that has received the control information (tc) reset request from any branch station exchange 2-i resets the control information (tc) for each of the branch station exchanges 2-1 to 2-n. The processing is not limited to the one that executes the processing, and many other modifications may be considered, such as executing the resetting processing only for the branch exchange 2 -i that is the source of the resetting request. In either case However, the effect of the present invention does not change.
Further, it goes without saying that the configurations of the control center exchange 1, the branch exchange 2, and the exchange network which are the subject of the present invention are not limited to those shown in the drawings.

[0045]

As described above, according to the present invention, all branch office switches in the switching network receive and set the control information all at once, and all the communication lines in the switching network can be used. Since it will be regulated all at once, and abnormalities that occur in the control information already set in each branch office exchange will be automatically detected, and the control station exchange will be automatically requested to reconfigure. Communication will be reliably ensured.

[Brief description of drawings]

FIG. 1 is a diagram showing the principle of the present invention.

FIG. 2 is a diagram showing a switching network according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a conventional switching network.

[Explanation of symbols]

 1 Control station switch 2 Branch office switch 3 Communication line 11, 21 Network (NW) 12, 22 Central control unit (CC) 13, 23 Main storage device (MM) 14 Control console (TCB) 15, 24 Trunk (TRK) 16 , 25,181 PB receiver (REC) 17,182 PB transmitter (SND) 18 Control station controller (MTC) 26 Signal distribution device (SD) 27 Branch office controller (BTC) 100 Broadcasting means 201 Holding means 202 Collating means 271 Holding unit (HLD) 272 Collating unit (MCH)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor ▲ Yoshi ▼ Ao Ii 3-9-18 Shin-Yokohama, Kohoku Ward, Yokohama City, Kanagawa Prefecture Fujitsu Communication Systems Limited (72) Inventor Noriko Akiwa Yokohama City, Kanagawa Prefecture 3-9-18 Shin-Yokohama, Kohoku-ku, Fujitsu Communication Systems Limited (72) Terufumi Watanabe, 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited

Claims (1)

[Claims] 1. A control center exchange (1) and a plurality of branch exchanges (2) are connected by a communication line (3), and the control center exchange (1) restricts the use of each communication line (3). In a switching network in which a control stand (14) is installed, use of the communication line (3) in each of the branch exchanges (2) inserted from the control stand (14) into the control center exchange (1). Broadcasting means (100) for simultaneously transmitting the control information (tc) for restricting the transmission to all the branch office exchanges (2) via the respective communication lines (3) is provided. In (2), the control station exchange (1)
Holding means (201) for holding the control information (tc) transmitted from the branch office exchange (2) in parallel, and the control information (t) held by the branch exchange (2).
c) is collated with the control information (tc) held by the holding means (201), and when a mismatch is detected in the collation result, the control station exchange (1) is sent via the communication line (3). ) Is provided with collating means (202) for requesting retransmission of the control information (tc).