JP3147464B2 - Line control method - Google Patents

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 office exchanges is controlled by a control base.

For example, in a disaster prevention communication system for each prefecture, a control center exchange installed in a prefectural office and a branch office exchange 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 exchange and each branch office exchange, but in the event of a disaster or the like, secure emergency communication between the control center exchange and each branch office exchange. Therefore, it is necessary to regulate the use of the communication line with respect to 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 center exchange 1 installed in a prefectural office and a branch office exchange 2 installed in each of a plurality of branches [each branch office exchange is referred to as 2-i (where i is 1 to n). [Similar]] is connected by the communication line 3.

In FIG. 3, only the structure of a specific branch office exchange 2-1 is shown, and the structures of other branch office exchanges (for example, 2-n) are omitted. The control exchange 1
In a state where the control information (tc) for restricting the use of the communication line 3 is not set in the main storage device (MM) 13, a call directed to an arbitrary branch office exchange 2-i occurring in the control office exchange 1 is performed. On the other hand, a call is set up using the communication line 3-i unconditionally.

[0005] Each branch office exchange 2 also has a main storage device (M
M) In the state where the control information (tc) is not set in 23 , the control station exchange 1 that occurs in the control station exchange 1
Alternatively, for a call addressed to another branch office exchange 2, a call is set up using the communication line 3 unconditionally.

In such a switching network, when it becomes necessary to secure emergency communication, a call is made from a control board (TCB) 14 installed in the control center exchange 1 and occurs in 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 office exchange 2. When detecting a call from the control board (TCB) 14, the central control unit (CC) 12 of the control center exchange 1 controls the network (NW) 11 to control the control board (TCB) 14 and the PB receiver (REC). 16 is received and analyzed via a PB receiver (REC) 16 through a PB receiver (REC) 16 to identify it as control information (tc).
M) The control information (tc) is stored in a predetermined area in 13.

Subsequently, the central control unit (CC) 12 captures the communication line 3-1 via a trunk (TRK) 15-1 accommodating the communication line 3-1 and sends it to the branch office exchange 2-1. Outgoing connection is established, and the network (NW) 11 is controlled to control the PB transmitter (SND) 17 and the trunk (TR).
K) 15-1 and connects the control information (tc) to the PB transmitter (SND) 17 to transmit the control information (tc).
c) is transmitted to the branch office exchange 2-1 via the communication line 3-1 by the PB signal.

In branch office exchange 2-1, when central control unit (CC) 22 detects an incoming call from communication line 3-1 via trunk (TRK) 24, it controls network (NW) 21. Trunk (TRK) 24 and PB
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 the control information is received. If identified as (tc), the control information (tc) is stored in a predetermined area in the main storage device (MM) 23.

When the control center exchange 1 completes the setting process of the control information (tc) for the branch office switch 2-1, the control information (tc) is also applied to the other branch office exchanges 2-i in the same procedure. Are sequentially set.

In the control center exchange 1, when the central control unit (CC) 12 detects a call addressed to an arbitrary branch office exchange 2-i, it analyzes the call type and identifies it as general communication.
Subsequently, referring to a predetermined area in the main storage device (MM) 13,
It is analyzed whether or not the control information (tc) has been set, and when it is detected that the control information (tc) has been set, capture of the communication line 3-i is prohibited, and the branch office exchange 2 for the call concerned is prohibited.
-Restrict calls to i.

In each branch exchange 2-i, when the central control unit (CC) 22 detects a call addressed to the control center exchange 1 or another branch exchange 2, the call type is analyzed and general communication is performed. , Then the main memory (MM)
23 , it is analyzed whether or not the control information (tc) is set. When it is detected that the control information (tc) is set, the acquisition of the communication line 3-i is prohibited. The control exchange 1 of the call or another branch exchange 2
Restrict calls to.

In any branch office exchange 2-i,
When the main storage device (MM) 23 is initialized and the stored control information (tc) disappears due to a failure occurring in the main storage device (MM) 23, etc., the branch office exchange 2-
The maintainer of i detects the disappearance of the control information (tc), and controls the control station (TCB) of the control center exchange 1 by some communication means.
14 is requested to reset the control information (tc).

The control board (TCB) 14 requested to reset the control information (tc) re-sets the control information (tc) for the control center exchange 1 and each branch office exchange 2 in the same procedure as described above. Execute.

[0015]

As is apparent from the above description, in a conventional switching network, the control center exchange 1 has control information (tc) input from a control board (TCB) 14.
Is transmitted to only one branch office exchange 2 at a time, and after the setting of the control information (tc) for one branch office exchange 2 is completed, the control information (tc) is transmitted to the next branch office exchange 2. ), It takes a long time to finish setting the control information (tc) for all the branch exchanges 2, while the communication line 3 is secured for emergency communication. When the control information (tc) already set in any branch exchange 2-i disappears due to a failure or the like, the maintenance person of the branch exchange 2-i detects the disappearance of the control information (tc). And the control board (TCB) 14 of the control center exchange 1
However, there is a problem that the communication line 3-i is regulated and progresses as long as the request is not made.

An object of the present invention is to make it possible to simultaneously set control information for each branch office exchange, and to detect an abnormality in the control information in each branch office exchange as quickly as possible and to enable resetting. I do.

[0017]

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

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

[0019]

The simultaneous transmission means 100 transmits the control information tc, which is input from the control board 14 and causes the respective branch office exchanges 2 to regulate the use of the communication lines 3, to all the branch office exchanges via the respective communication lines 3. Send to 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 switch 2. The collating means 202 stores the control information tc held by the local branch exchange 2 in the control information t
c, and when a mismatch is detected in the comparison result, a request is made to the control center exchange 1 via the communication line 3 to retransmit the control information tc.

Therefore, all the branch exchanges receive and set the control information all at once, so that the use of all communication lines in the switching network is regulated at the same time. An abnormality occurring in the control information already set is automatically detected, and resetting is automatically requested to the control center exchange, so that emergency communication in the switching network is reliably secured.

[0022]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram illustrating a switching network according to an embodiment of the present invention. The same reference numerals indicate 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 broadcast means 100 in FIG. 1, and a holding unit (HLD) 271 is used as the holding means 201 in FIG. Further, a branch office control device (BTC) 27 having a matching unit (MCH) 272 as the matching unit 202 in FIG.

FIG. 2 also shows only the structure of a specific branch office exchange 2-1 and omits the structures of other branch office exchanges (eg, 2-n). When it becomes necessary to secure emergency communication in the switching network shown in FIG. 2, a call is issued from a control board (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 switch 1 and each branch office switch 2 is input to the control center switch 1 as a PB signal.

Central control unit (CC) 1 of control center exchange 1
2 detects a call from the control board (TCB) 14,
Controls the network (NW) 11 and controls (TCB)
14 is connected to a PB receiver (REC) 16, and subsequently, a PB signal input from the control board (TCB) 14 is received and analyzed via the PB receiver (REC) 16, and control information (t
If identified as c), the control information (tc) is stored in a predetermined area in the main storage device (MM) 13.

Subsequently, the central controller (CC) 12 controls the network (NW) 11 to control the PB transmitter (SND).
By connecting the control information (tc) to the PB transmitter (SND) 17 by connecting the control information (tc) to the PB transmitter (SND) 17, the control information (tc) is transmitted to the network (NW) 11 by the PB signal. Control station control unit (MTC)
To 18.

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

The central control unit (CC) 12, which has received the outgoing connection request from the control center control unit (MTC) 18, transmits the trunk (TR) accommodating each of the communication lines 3-1 to 3-n.
K) Capture the communication lines 3-1 to 3-n via 15-1 to 15-n, make outgoing connections to the branch office exchanges 2-1 to 2-n, and establish the network (NW) 11 By controlling, the control station controller (MTC) 18 is connected to each of the trunks (TRK) 15-1 to 15-n.

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

In the branch office exchange 2-1, when the central control unit (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 a trunk (TRK) 24 and a holding unit (HLD) 271 in a branch office control unit (BTC) 27 are connected.

Subsequently, the central control unit (CC) 22 transmits 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
If identified as c), the control information (tc) is stored in a predetermined area in the main storage device (MM) 23.

On the other hand, the holding unit (HLD) 271 has a PB signal receiving function like 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 identified as the control information (tc), the PB signal is stored in the branch office control device (BTC) 27.

The central control unit (CC) 22 monitors the control information (tc) stored in a predetermined area in the main storage unit (MM) 23, and controls the branch office via a signal distribution unit (SD) 26. The control setting information (c) is stored in the device (BTC) 27.
i).

The collation unit (MCH) 272 in the branch office control unit (BTC) 27 includes 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 if it is determined that they match, the information is stored in a predetermined area in the main storage device (MM) 23. The normality of the control information (tc) is checked.

In the other branch office exchanges 2-2 to 2-n, control information (t) transmitted simultaneously from the control office exchange 1 in the same process as in the branch office exchange 2-1.
c) is stored in a predetermined area in the main storage device (MM) 23 and is held in the branch office control device (BTC) 27,
The collating unit (MC) in the branch office control unit (BTC) 27
H) 272 is the control information (tc) held in the branch office control device (BTC) 27 and the control setting information (ci) transmitted from the central control device (CC) 23 via the signal distribution device (SD) 26 ) Is checked, and the normality of the control information (tc) stored in a predetermined area in the main storage device (MM) 23 is confirmed.

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

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

Control information (tc) and control setting information (ci)
The collation unit (MCH) 272, which has collated the data with the central control unit (CC) 22, detects a mismatch in the collation result due to the disappearance of the control setting information (ci).
Requires an outgoing connection.

The central control unit (CC) 22 having 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 an outgoing connection to the control center exchange 1 and controls the network (NW) 21 to control the branch office control unit (BTC) 27 and the trunk (TRK) 2.
4 is connected.

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

In the control center exchange 1, when the central control unit (CC) 12 detects an incoming call from the communication line 3-i via the trunk (TRK) 15-i, the network
(NW) 11 to connect the trunk (TRK) 15-i to the PB receiver (REC) 16, and then to transmit the PB signal arriving from the communication line 3-i to the PB receiver (REC).
When the received information is analyzed via the communication line 16 and identified as a request for resetting the control information (tc), the control information (tc) is reset for each of the branch office exchanges 2-1 to 2-n in the same procedure as described above. Execute

In the local branch exchange 2-i, the normal control information (tc) is stored in a predetermined area in the main storage (MM) 23 by the resetting processing of the control information (tc) executed by the control central exchange 1. It is stored again, and as a result, normal control setting information (ci) is also transmitted to the branch office control unit (BTC) 27, and the collation unit (MCH) 272 is held in the branch office control unit (BTC) 27. The normality of the control information (tc) stored in the main storage device (MM) 23 is confirmed by comparing the existing control information (tc) 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 board (TCB) 14 is transmitted from the control station control device (MTC) 18 to each communication line 3-1. To all branch office exchanges 2 through 3-n
-1 to 2-n are simultaneously transmitted to each branch office exchange 2-
Main memory (MM) 23 in parallel with 1 to 2-n
The branch office exchanges 2-1 to 2-n start restricting the use of the communication lines 3-1 to 3-n for general communication at the same time, and the emergency communication is started. Is surely secured. Each branch office exchange 2-
The normality of the control information (tc) stored in the main storage device (MM) 23 of i is constantly monitored by the matching unit (MCH) 272, and when an abnormality occurs in the control information (tc), the control is immediately performed. A request for resetting the control information (tc) is transmitted to the central office switch 1, and the control information (tc) is immediately reset from the control center exchange 1. Therefore, the control information (tc) in which the abnormality has occurred is lost. It will be repaired automatically and quickly.

FIG. 2 is merely an embodiment of the present invention. For example, the control information (tc) is not limited to one that uniformly regulates general communication, and priority is given to general communication. Although many other variations are considered, such as limiting the regulation range, the effect of the present invention does not change in any case. The broadcasting means 100 is not limited to the control center control device (MTC) 18 shown in the figure. For example, when the control center exchange 1 is a time division exchange, the distribution function of the network (NW) 11 is used. Each branch office exchange 2-
The control information (tc) is simultaneously transmitted to 1 to 2-n,
Many other variations are considered, but the effect of the invention remains the same in any case. Further, the control center exchange 1 receiving the request for resetting the control information (tc) from any branch office exchange 2-i resets the control information (tc) for each of the branch office exchanges 2-1 to 2-n. It is not limited to the one that executes the processing, and many other modifications are considered, such as executing the resetting processing only for the branch office exchange 2-i that is the resetting request source. 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 office exchange 2, and the exchange network to which the present invention is applied are not limited to those shown in the drawings.

[0045]

As described above, according to the present invention, in the switching network, all branch exchanges receive and set control information at the same time, so that all communication lines in the switching network can be used. Regulations will be enforced all at once, and abnormalities that occur in the control information that has been set in each branch office exchange will be automatically detected, and resetting will be automatically requested to the control office exchange. Communication can be reliably ensured.

[Brief description of the drawings]

FIG. 1 illustrates 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 shows an example of a conventional switching network.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control center exchange 2 Branch office exchange 3 Communication line 11, 21 Network (NW) 12, 22 Central control unit (CC) 13, 23 Main storage unit (MM) 14 Control stand (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 station controller (BTC) 100 Broadcasting means 201 Holding means 202 Checking means 271 Holder (HLD) 272 Checker (MCH)

Continuation of the front page (72) Inventor ▲ Yoshi ▼ Ao Ii 3-9-18 Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Fujitsu Communication Systems Limited (72) Inventor Noriko Akiwa Shin-Yokohama, Kohoku-ku, Yokohama-shi, Kanagawa 3-9-18 Fujitsu Communication Systems Co., Ltd. (72) Inventor Terufumi Watanabe 1015 Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Within Fujitsu Co., Ltd. (58) Field surveyed (Int.Cl. ⁷ , DB Name) H04M 3/00 H04M 3/38 H04M 7/00-7/16 H04Q 3/54-3/545

Claims (1)

(57) [Claims] 1. A control station exchange and a plurality of branch office exchanges are connected by a communication line, and each of said communication is connected to said control station exchange.
In a switching network in which a control board for instructing the use of a line is installed, control information (tc) input from the control board and used by the branch office switches to control the use of the communication line is provided to the control center switch. Providing simultaneous transmission means for simultaneously transmitting to all of the branch office exchanges via the respective communication lines, the control information (tc) transmitted from the control office exchange to each of the branch office exchanges, Holding means for holding the branch office exchange in parallel, and the control information (tc) held by the branch office exchange,
The control information is compared with the control information (tc) held by the holding means, and when a mismatch is detected in the check result, the control information (tc) is sent to the control center exchange via the communication line.
c) a collation means for requesting retransmission in (c).