JPH02153661A - Plural subscriber units housing system - Google Patents

Abstract

PURPOSE:To rapidly perform the communication of a significant subscriber by housing in duplicate the significant subscriber in a subscriber exchange in advance, and switching the significant subscriber to the subscriber exchange of a duplicate housing destination when a fault occurs in the subscriber exchange. CONSTITUTION:The significant subscribers 4a-4n of the subscriber exchanges 1a-1n are housed in duplicate in another subscriber exchanges in advance. When the fault occurs in either the subscriber exchanges 1a-1n, the outgoing/incoming connection of the significant subscriber of the subscriber exchange in which the fault occurs can rapidly be performed by switching means 6a-6n, a means to inform the occurrence of the fault to a required part, and a switching or process change means for connection destination exchange via the subscriber exchange of the duplicate housing exchange. Thereby, it is possible to secure the communication of the significant subscribers 4a-4n without performing the change of the housing of the significant subscribers 4a-4n, the generation of station data and the change of the station data of a related exchange, etc., when the fault occurs.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to a method for securing communications for important subscribers in the event of a failure of a subscriber exchange. The purpose of this system is to quickly enable communications for important subscribers by switching the important subscriber to a subscriber exchange that is accommodating redundant customers in the event of a failure of an exchange. A communication network in which the final connection route between exchanges and between a subscriber exchange and a toll exchange is via a relay exchange, or where a plurality of digital subscriber exchanges are installed and all connections with other stations are through the plurality of subscriber exchanges. In a central office switching system that uses common line signal processing equipment and synchronous terminal equipment, some of the subscribers accommodated in one subscriber exchange are redundantly accommodated in other subscriber exchanges. means for normally performing connection processing in one of the subscriber exchanges, and for switching the subscriber to a subscriber exchange that accommodates the subscriber in the event of a failure in the subscriber exchange; a notification means for notifying the common line signal processing device and the synchronization terminal device of the occurrence of a failure; and a subscriber exchange that accommodates duplicate incoming connections to the subscriber in the relay exchange or the common line signal processing device and the synchronization terminal device. The system is provided with means for switching connection destination exchanges or route change means for switching over to a subscriber exchange, and is configured to perform connection processing for some of the accommodated subscribers via the subscriber exchange that is the duplicate destination when a subscriber exchange breaks down.

[Industrial application field]

The present invention relates to a method for securing communications for important subscribers when a subscriber exchange breaks down.

In recent years, the impact of failures in communication systems on society has become extremely large, so various measures have been taken to prevent a complete disruption of communication in the event of a failure that disrupts communication in switching equipment or transmission lines. It is taken. However, these countermeasures focus on the relay tiers in the communication network where measures such as detour connections can be taken, and it is difficult to take measures against failures at the end subscriber tiers where detours are not possible. In the event of a breakdown in a subscriber exchange that disrupts service, a common measure is to relocate some socially important subscribers from the failed exchange to another, but line switching work requires a large amount of work. In addition, it is difficult to respond quickly because it is necessary to convey connection information not only to the exchange that is to be replaced, but also to the many exchanges involved in the connection.

[Conventional technology]

FIG. 5 shows a block diagram of an embodiment of a conventional technique for securing communications for important subscribers when a subscriber exchange breaks down. In FIG. 5, 41a and 41b are local exchanges, 42 is a relay exchange or toll exchange having a connection line to the local exchange, and 43 is an important subscriber of the local exchange 41a.

Now, because the subscriber exchange 41a is out of service due to a failure,
In order to secure the communication of the important subscriber 43, the important subscriber 4
The main parts of the means for accommodating 3 in another subscriber exchange 41b will be explained.

First, in order to accommodate the important subscriber 43 in the subscriber exchange 41b, a line is connected from the important subscriber 43 to the subscriber exchange 41b. In parallel with this, work is performed to add subscriber data for accommodating the important subscriber 43 to the subscriber exchange 41b. Further, in another exchange 42, data creation work is performed to switch the connection to the important subscriber 43 from the subscriber exchange 41a to the subscriber exchange 41b. Only when all of these are completed can the important subscriber 43 make or receive calls, but the above work requires a considerable amount of time and effort, and has the disadvantage that it is difficult to respond quickly.

[Problems to be Solved by the Invention] As mentioned above, in the conventional technology, even if some preparations have been made in advance for failures, there are many operations that are carried out after the subscriber exchange has failed, so important subscribers' communications There was a problem in that it was not possible to secure the necessary information quickly.

According to the present invention, communication of important subscribers is quickly carried out by accommodating important subscribers redundantly in other subscriber exchanges in advance, and switching the important subscribers to the subscriber exchange where the subscriber exchange is duly accommodated when the subscriber exchange breaks down. The aim is to make it possible to

[Means to solve the problem]

FIG. 1 and FIG. 2 show the principle configuration diagram according to the present invention.

FIG. 1 shows a system in which some of the subscribers of a local exchange are redundantly accommodated in the local exchange of another telephone exchange and switched in the event of a failure. In FIG. 1, 1a to In are subscriber exchanges (LSA=LSA) installed at telephone stations A to N, respectively.
, ), 2 is the transit switch (MS) of the subscriber switching hierarchy, 3
4a to 4n are the toll exchanges (TS) of the toll exchange ladder, and 4a to 4n are some of the subscribers accommodated in the subscriber exchanges 1a to 1n, respectively, and are important subscribers (multiple) who should be quickly restored in the event of a switch failure. , 5a to 5n are each subscriber exchange 1a to 1n.
Other general subscribers 6a to 6n are changeover switches for switching subscriber lines, such as accommodating important subscribers to other subscriber exchanges.

The subscriber exchange ladder portion of the communication network shown in FIG. The network configuration is such that the final connection route between them is made through two relay exchanges. Furthermore, an important subscriber 4a accommodated in one subscriber exchange 1a is accommodated redundantly in another subscriber exchange 1b, and the station data of the subscriber 4a is also set in the subscriber exchange 1b.

Therefore, the subscriber exchange 1b always accommodates the important subscriber 4a of the subscriber exchange 1a in addition to the general subscriber 5b and the important subscriber 4b who are the original subscribers of the exchange. In the normal state, the important subscriber 4a is disconnected from the central office at the changeover switch 6a, and the connection process is performed only by the local exchange 1a, so the important subscriber 4a is simply disconnected from the local exchange 1b. The phone is treated as being on-hook. Similarly, for subscriber exchanges 1b-1n, each important subscriber 4b-4n is accommodated redundantly in other subscriber exchanges 1c-1a.

Now, in FIG. 1, if a failure occurs in the subscriber exchange 1a and the exchange becomes out of service, the important subscriber 4a accommodated in the exchange 1a can be transferred to the subscriber of central office B by switching the changeover switch 6a. It is transferred to the exchange 1b.

Since the station data of the important subscriber 4a is set in the subscriber exchange ib in advance as described above, the outgoing connection from the important subscriber 4a is possible at the same time as the switching. Furthermore, at the same time as described above, by notifying the trunk exchange 2 that the local exchange 1a is in a failure state, the trunk exchange 2 allows the incoming call connection to the important subscriber 4a to be connected to the subscriber exchange 1b accommodated in the local exchange 1b. Switch the connected exchange so that it is treated as a person. In this case as well, since the information for incoming call connection to the important subscriber 4a via the subscriber exchange 1b is set in advance as the station data of the transit exchange 2, the destination exchange can be quickly switched upon notification of a failure.

In FIG. 1, the important subscriber 4n of the subscriber exchange 1n of the telephone office N is accommodated in the subscriber exchange 1a of the telephone office A in duplicate, but the overlap is not necessarily such that they form a loop as shown in the figure. There is no need to accommodate multiple telephone exchanges, and the exchange that accommodates multiple telephone exchanges may be determined as appropriate, taking into consideration the geographical location of telephone offices, line configurations, traffic conditions, etc. In addition, in FIG. 1, each telephone office is equipped with l units of subscriber exchanges, and one telephone office, for example, the subscriber exchange 1a of telephone station A,
Important subscriber 4a is accommodated in duplicate in the local exchange 1b of telephone station B, but if two or more units of local exchange are installed in telephone station A and the network configuration meets the above conditions, It goes without saying that the same effect can be obtained even if multiple units are accommodated in other units within the same telephone office.

Fig. 2 is another principle configuration diagram of the present invention, in which when multiple units of digital subscriber exchanges are installed in the same telephone office, some subscribers of one unit are accommodated redundantly in other units, and in the event of a failure. The switching method is shown below. In Figure 2,
11a and 11b are two unit digital subscriber exchanges (A unit LS, B unit
unit LS, ), 12 is a common channel signal processing device (CSP) used in common by the subscriber exchanges 11a and 11b of the two units, 13 is a synchronous terminal device (MUX), L4a and 14b are important subscribers of subscriber exchanges 11a and 11b, 16a and 16, respectively.
b is a changeover switch for switching subscriber lines.

In FIG. 2, the lines between the destinations R and -R are divided into A and 8-car units by semi-fixed buses that are semi-fixedly set in the synchronous terminal device 13 for each destination, for example, The A unit and the B unit are connected to the ground R1 by buses 13a and 13b, and the ground R9 is connected by buses 13d and 13e, respectively. In addition, all signal transmission and reception with other stations is performed using the common line signaling system, and when receiving calls from other stations, A unit 11a and B unit) 1
Common line signal processing device 12 shared by both subscriber exchanges 1b
receives the called party number, and the called party is A.

B: Determine in which unit the called party number is accommodated, and send the called party number to the control device (not shown) of the corresponding unit.

Now, if the A unit 11a of the digital subscriber exchange is out of service due to a failure in FIG. It will be relocated to. As in FIG. 1, the B unit 11b includes
Since the station data of the important subscriber 14a is set more than usual, the outgoing connection from the important subscriber 14a becomes possible at the same time as the switching. At the same time as above, semi-fixed paths 13a, 1
3d etc. to B unit respectively 13c, 13f
Perform a route change means to change the route to, etc. Further, when the common line signal processing device 12 receives a failure notification of the A unit, it identifies the incoming connection from each destination to the important subscriber 14a of the A unit by the called party number, and changes the connection to the B unit.

As described above, by adopting the configuration and means shown in FIG. 1 or 2, important subscribers can be quickly switched to another exchange when a subscriber exchange breaks down, and the above-mentioned problems in the conventional system are solved. .

[For production,]

In the present invention, important subscribers of one subscriber exchange are accommodated redundantly in other exchanges in advance, and when a failure occurs in the exchange, the switching means is operated, and the occurrence of the failure is transferred to the necessary location. By notifying, the important subscriber accommodated in the faulty exchange is switched to the exchange that is double-accommodated, and the connection to the important subscriber is changed at the transit exchange etc. so that the connection to the important subscriber is via the subscriber exchange that is double-accommodated. Measures are taken to switch exchanges and change routes, allowing calls to be made and received quickly from important subscribers.

〔Example〕

FIG. 3 is a configuration diagram of an embodiment based on the principle configuration diagram of FIG. 1,
FIG. 4 is a block diagram of an embodiment based on the principle block diagram of FIG. 2.

In FIG. 3, the same symbols are used for the same parts as in FIG.
23a and 23b are switching control lines through which notifications or switching control signals from the maintenance console 23 are sent, and 24 is a control device for the relay exchange a2.

The important subscriber 4a of the subscriber exchange 1a is the subscriber circuit 21a.
is accommodated in the subscriber exchange 1a through the changeover switch 6a of the subscriber circuit 21a and the subscriber circuit 2.
It is also accommodated in the subscriber exchange 1b via 1b. The subscriber exchange 1b also has station data set for the important subscriber 4a, but normally the important subscriber 4a is turned off at the changeover switch 6a, so the subscriber exchange is in the same state as the on-footer. When 1a becomes disconnected due to a failure, the maintenance person switches the selector switch 6a and notifies the relay exchange 2, and the relay exchange 2 switches the destination exchange for the important subscriber 4a from 18 to 1b. FIG. 3 shows an example in which the notification and switching means are performed remotely from the maintenance console 23 of the centralized maintenance station. That is, by operating the maintenance console 23, a control signal is sent through the switching control L'A 23a,
In the subscriber exchange 1a, subscriber circuits 21a and 21
The changeover switches 6a and 6c of C are switched, and as a result, the important subscriber 4a is connected to the subscriber circuit 21 by the subscriber exchange 1b.
b, and an outgoing connection is immediately possible. Further, when the general subscriber 5a tries to make a call by switching the selector switch 6C of the subscriber circuit 21c, the caller 5a is connected to the talkie device 22, and a talk message indicating that the exchange is out of order will be heard. On the other hand, a control signal is sent to the trunk exchange 2 through the switching control line 23b, and the control device 24 of the exchange
The station data for making the incoming call connection to subscriber exchange 1b is now used, and the destination exchange is switched. As a result of the above, important subscriber 4a of subscriber exchange 1a
can make and receive calls via the subscriber exchange 11b.

In addition, although we have explained the switching means etc. by remote control from the central maintenance station above, each exchange etc. automatically receives failure notification of the subscriber exchange and performs the switching means etc., and each telephone office or relay Of course, the same effect can be obtained by having the maintenance personnel of the switching center intervene and perform the notification, accommodation switching, and connected switching equipment switching means.

FIG. 4 shows the configuration of an embodiment based on the principle configuration diagram of FIG. 2. In the diagram, the same parts as in FIG. Common line signal transmitting/receiving device (CS), 33 is a maintenance console, 33a
- 33d are switching control lines from the maintenance console 33, 34a,
34b is a channel control device (CH) of the subscriber exchange.

When the A unit 11a of the subscriber exchange is out of service due to a failure, the important subscriber 14a is transferred to the B unit 11b via the subscriber circuit 31c by operating the changeover switch 16a, using the same procedure as in the principle configuration shown in FIG. Accommodation will be switched. On the other hand, the synchronous terminal device 13 consists of a time switch, and as mentioned above, the line for each destination is set as a semi-fixed path to both units A and 8, but the A unit 11a
If there is a failure, the route change means in the synchronous terminal device 13 switches the semi-fixed path from each destination to the A unit 11a to (13) from the B unit, but the A unit subscribers accommodated in the B unit 11b Since the important subscriber 14a is only a part of all the subscribers of unit A, all lines are not switched, and only some lines are switched to unit B.
Unit) Switch to I1b. For example, a part of the path 13a to the ground R5 is changed to the path 13c and switched to the B unit 11b. The occurrence of an invalid call to the A unit which cannot be connected even if an incoming call is received is prevented by sending a blocking signal from the common line signal processing device 12 to the other party's destination via the common line signal transmitting/receiving device 32.

In addition, the common line signal processing device 12 has a built-in high-speed processor, and even under normal conditions, it receives the called party numbers of incoming calls to both units A and 8 all at once, and stores them in either unit A or B based on the number. The called party number is sent to the control device of the subscriber exchange through the channel control device 34a or 34b of the accommodating exchange. While the key subscriber 14a is being switched to the B unit, the accommodating exchange is determined based on the table indicating that the important subscriber 14a is being accommodated in the B unit, and in response to an incoming call to the important subscriber 14a, the called party number is sent to the B unit. . Therefore, even if an important subscriber is relocated, it is possible to quickly deal with the situation.

In the above, operation of the changeover switch 16a or notification of failure to the common line signal processing device 12, etc. is performed through the changeover control lines 33a to 33d by operation of the maintenance console 33, but the maintenance person manually operates each device. Of course, the same result can be obtained even if the operation is performed manually or automatically without the intervention of a maintenance person. Also,
Although the above example has been explained in which only two units A and B are installed, it is of course possible to perform similar processing even if more units are installed.

As described above, even if one subscriber exchange breaks down in a telephone office where a plurality of subscriber exchange units are installed, the important subscriber can be switched to another unit and can be quickly connected.

〔Effect of the invention〕

As explained above, according to the present invention, an important subscriber of one subscriber exchange is redundantly accommodated in another subscriber exchange in advance, and when a failure occurs in the subscriber exchange, the switching means is activated. , a means for notifying necessary locations of the occurrence of a failure;
By switching the connection destination exchange or changing the route, it is possible to quickly connect calls to and from the important subscriber of the failed local exchange via the duplicate destination subscriber exchange. Therefore, when a failure occurs, communications for important subscribers can be quickly secured without having to change the accommodation of important subscribers, create station data, or change the station data of related exchanges, improving the reliability of the communication network. There is a lot to contribute.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram of another principle of the invention, FIG. 3 is a diagram of an embodiment based on the principle of FIG. 1, and FIG. 4 is a diagram of the principle of FIG. FIG. 5 is a diagram showing the configuration of an embodiment based on the principle configuration, and FIG. 5 is a diagram showing the configuration of an embodiment based on the prior art. In the figure, the symbols indicate the following. 1aNinl 11a~, 41a~-・Subscriber exchange 2-・−・・−・−・−−−−−・−・−・・・
−・−・・Relay switch 3 ・−・−・−・−・−
・-・Toll exchange 4a~4r++14a~+43-・-
=・Important subscribers 5a~5n−・・・−・−・−・
−・−・・・General subscribers 68~6n+16a～・−・−
・−・Selector switch 12 −−−−−−・−・・−・・
−・−・−・−・・Common line signal processing device 13
・−・・−・−・・−・−・−・Synchronous terminal device 13
a~13f ・−・−−−−−・−・−・・・−・・
Paths 21a to 21d in the synchronous terminal device, 31a to...
・・・−・−Subscriber circuit 22 ・・・−・・・−・・
−・−・−・・−・・−・・talkie device 2
3, 33−・−・−・−・・−・−・・・・・−・
Maintenance operation consoles 23a to 23b, 33a to -------
=Switching control line 24 -・・・−1−−−−・・−・−
・−・・−・・−・−・Relay exchange control device 32 ・
−・・・・・・・・−−−−−・・−・−・−・・
······Common line signal transmitting and receiving device 34a to 34b·−
・・−・−・−・−・Channel control device 42
・−・・−・・−・・・・Relay or toll exchange machine Principle configuration diagram of the present invention (2) Fig. 2

Claims (1)

[Claims] 1. A plurality of subscriber exchanges (1a to 1n) and a relay exchange (
2), and between the subscriber exchanges (1a to 1n) and between the subscriber exchanges (1a to 1n) and the toll exchange (3).
In a communication network of a subscriber exchange hierarchy in which the final connection route between subscribers is via a relay exchange (2), some of the subscribers (4a) accommodated in one subscriber exchange (1a) are connected to other subscribers. The subscriber exchange (1a) is duplicated in the exchange (1b), and normally one of the subscriber exchanges (1a) performs connection processing, and when a failure occurs in the subscriber exchange (1a), the subscriber (4)
switching means for switching a) to perform the connection processing at the subscriber exchange (1b) which is the duplicate accommodation destination; a notification means for informing the relay exchange (2) of the occurrence of a failure; A connecting switch switching means is provided for switching an incoming call to a subscriber (4a) via the subscriber exchange (1b) of the duplicate accommodation destination, and in the event of a failure of the subscriber exchange, connection processing for some of the accommodated subscribers is switched to the duplicate accommodation destination. A system for accommodating multiple subscriber units, characterized in that the communication is carried out via a subscriber exchange. 2. Multi-unit digital subscriber exchange (11
a, 11b) is installed, and all connections with other stations are a common line signal processing device (12) installed in common in the plurality of subscriber exchanges (11a, 11b) and a synchronous terminal device (1).
3) In a switching system of a central office that is operated via performs connection processing in one subscriber exchange (11a), and when a failure occurs in the subscriber exchange (11a), connects the subscriber (14a) at the subscriber exchange (11b) that is the duplicate destination. a switching means for switching to cause the common line signal processing device (12) and the synchronous terminal device (13) to perform the processing; a notification device for notifying the common line signal processing device (12) and the synchronous terminal device (13) of the occurrence of a failure; The station equipment (13) is equipped with a route change means for switching the incoming call connection to the subscriber (14a) via the subscriber exchange (11b) which is the duplicate accommodation destination, so that when the subscriber exchange breaks down, the connection of some of the accommodated subscribers is changed. A system for accommodating multiple subscriber units, characterized in that processing is performed via subscriber exchanges that are duplicately accommodated.