JP3060038B2 - Exchange module spare switching system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the connection of a transmission line between a subscriber line terminating module for terminating a subscriber line and a switching module of a building block type switchboard. The present invention relates to an exchange module spare switching system in which a subdivision mechanism is provided to switch to a spare exchange module to control a connection destination of a transmission line.

[0002]

2. Description of the Related Art In Japan, the number of telephone subscribers differs greatly between urban and rural areas, and as a result, the size of the exchange is wide ranging from several tens to several thousand alan. Are distributed. When a switching system is configured under such conditions, a portion where the number of devices increases in proportion to the traffic or the number of terminals is created in units of a fixed capacity called a module, and the size of the station is reduced. Accordingly, a method of stacking an optimal number of these modules to form a system has been used. This is called a building block configuration (for the building block configuration, see, for example, "Easy Digital Exchange" by Shinichi Aizawa, published by Ohmsha on January 5, 1983, pp. 144-146).

[0003]

Conventionally, in a method of connecting a transmission line between a subscriber terminating module for terminating a subscriber line and a switching module of a building block type exchange, an STM (STM) is provided between the two modules. Synchronous Transfer Mod
e) A sorting mechanism was provided. The STM distribution mechanism has a function of distributing to the corresponding switching module for each service such as analog subscribers and ISDN subscribers and for each call. In addition, switching modules accommodating subscribers of the conventional building block type exchange include:
No spare module was provided, so the STM sorting mechanism did not have the function of sorting to spare replacement modules. By the way, the STM distribution mechanism distributes the switching module to the corresponding switching module for each service such as analog subscribers and ISDN subscribers and for each call.
Hardware and software interface for each call
Is necessary. As a result, the STM sorting mechanism
Since the amount of hardware and the amount of software processing are increased, there have been problems such as a decrease in reliability, an increase in cost, and an increase in space for accommodating devices. In addition, as described above, since there is no spare switching module for accommodating subscribers,
When the switching module fails, the service of the subscriber accommodated in the switching module is stopped. An object of the present invention is to solve these conventional problems,
It is an object of the present invention to provide an exchange module spare switching system that can reduce the amount of hardware and software processing, and can prevent a service stop by switching to a spare when a failure occurs in the exchange module.

[0004]

In order to achieve the above object, a switching module spare switching system according to the present invention comprises a switching module for switching a subscriber termination module for terminating a subscriber line and a switching module for accommodating an interoffice transmission line. In order to transfer information between modules, a plurality of building blocks are connected to each other by an STM switching module coupling mechanism having a cross-connect function for switching at a rate of 1 call or n times the rate of user information. In the type exchange, the STM distribution mechanism installed between the exchange module and the subscriber termination module is provided with a dedicated installation.
Or installed virtually on the replacement module.
A preliminary exchange module, sometimes the interchangeable module is a failure or the like, together with a centrally distributed without being aware of the analog subscriber and ISDN subscribers by the STM sorting mechanism switches from the switching module to the preliminary switching module It has special features.

[0005]

According to the present invention, the STM distribution mechanism unifies the services of analog subscribers and ISDN subscribers without being aware of the services. As a result, hardware and software for service identification become unnecessary. In addition, the distribution method is based on one of the user information.
This is performed using a cross-connect function performed in units of n times (1 <n) the speed of the call. In addition, the exchange module
In preparation for a failure of the module, a spare replacement module is virtually provided in a spare-only switching module or another switching module other than the spare-only switching module. As a result, the service stop of the subscriber can be prevented. Further, when the failed switching module recovers, the switching back from the switched spare switching module may be performed, or the switching module may not be switched back.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram of a switching module spare switching system showing one embodiment of the present invention. In FIG. 1, 1 is an exchange, 2 is a line trunk (LT), and 3 is S
TM distribution mechanism, 4 is a control section of the STM distribution mechanism,
5 is an exchange module having an OPS communication mechanism, 6 is an exchange module, 7 is a spare exchange module, 8 is a coupling mechanism between STM exchange modules, 9 is an operation center, 10
Is a subscriber line, 11 is a subscriber line termination module, 12 is a signal line, 13 is a transmission line, and 14 and 15 are lines in the exchange. First, in the first embodiment, when the switching module 6 fails, the speed of one call of the user information is n times (1 time).
<N) ST, a cross-connect function performed in speed units
A subscriber line termination module 11 is provided by the M distribution mechanism 3.
After the switching module 6 accommodating is replaced and connected to the spare switching module 7, when the failure of the switching module 6 is recovered, the switching mechanism 3 replaces the spare module 7 with the spare module. Switch back to module 6. The operation procedure is described below. (A) First, when the exchange module 6 becomes an obstacle,
An operation center 9 has a signal line 12, a line trunk 2, an exchange module 5 having an OPS communication mechanism, a coupling mechanism 8 between STM exchange modules, and a control section 4 of an STM distribution mechanism via an intra-switch line 15. , An instruction to switch the subscriber termination module 11 accommodated in the switching module 6 to the spare switching module 7 is issued.

(B) Next, upon receiving this instruction, the control unit 4 of the STM distribution mechanism switches the STM path, and sends the response signal to the operator via the same route as when the instruction was issued. To the service center 9. (C) Switching of the STM path is performed in units of speed of 1.5 Mb / s. Note that 1.5 Mb / s is equivalent to 24 terminals when converted by 64 Kb / s of a normal telephone terminal. (D) When switching the STM path, the switching module 6
The subscriber data is transferred to the spare switching module 7 from. (E) When the switching module 6 recovers after the switching of the STM path, the same procedure as in (a) and (b) above is performed.
The operation center 9 issues an instruction to the control unit 4 of the STM distribution mechanism to switch back from the spare replacement module 7 to the replacement module 6. (F) By transferring the information on the call setting during connection from the standby switching module 7 to the switching module 6 before the switching back, the disconnection of the call during communication due to the switching back is avoided. Is done. Further, when there is a possibility of disconnection of a call during communication, it is not necessary to transfer information related to the connection setting during connection before switching back.

Next, in the second embodiment of the present invention, when a failure occurs in the switching module, switching to the spare switching module is performed. A case in which no operation is performed will be described. When the switching module 6 fails, the subscriber termination module 1 is provided by an STM distribution mechanism having a cross-connect function of performing n times (1 <n) the speed of 1 call of user information in a unit of speed.
The exchange module 6 in which 1 is accommodated is switched to the spare exchange module 7. And, when the obstacle recovers, he does not switch back. Therefore, the first embodiment includes (a) to
The operation (d) is exactly the same. The procedure of the subsequent operation is described. (E) After the switching, when the exchange module 6 recovers, the switching back from the spare exchange module 7 to the exchange module 6 is not performed. That is, the recovered exchange module 6 is used as a new spare module. (F) Replacement module that has become a new spare replacement module
Module 6 is treated the same as spare replacement module 7.

Next, an application example of the present invention will be described. The subscriber termination module 11 is provided to the subscriber, and the switching module 6 is provided.
And replacing the switching module 7 with the subscriber termination module 11. That is, in FIG.
M distribution mechanism 3 is connected to subscriber and subscriber termination module 11
Apply in between. However, at this time, the speed unit distributed by the STM coupling mechanism 3 is 1 call of the user information.
N times (n ≧ 1).

In the present invention, the distribution operation of the STM distribution mechanism is performed in a unified manner without considering the services of analog subscribers and ISDN subscribers, so that hardware for service identification is used. Software is not required, and the distribution is performed using a cross-connect function that performs n-times (1 <n) speed units of one call of user information, so that line channel management and control are performed for each call. Since there is no need to perform channel management and control for a plurality of calls at once, the amount of hardware and the amount of software processing can be reduced. This effect is more significant as the speed unit is increased. Since the spare replacement module is virtually provided in the spare-only switching module or another switching module not dedicated to the spare, when the replacement module fails, the spare switching module is replaced by the STM distribution mechanism. By switching to the module, it is possible to prevent the service of the subscriber from being stopped. Further, when the failed exchange module recovers, it is possible not to switch back from the switched spare exchange module. In this case, the reduction in the number of times of switching can reduce the reduction in software processing amount and reliability. In addition, by making it possible to select whether or not to install the distribution mechanism 3, it becomes possible to configure an exchange that meets the required quality conditions.

[0011]

As described above, according to the present invention,
Channel management and control of a plurality of calls can be performed collectively without requiring line channel management and control for each call, so that the amount of hardware and the amount of software processing can be reduced. Further, by switching to the spare exchange module, it is possible to prevent the service of the subscriber from being stopped. Furthermore, by transferring the call setting information before switching back, it is possible to avoid disconnection of the call during communication due to switching back, and when not performing switching back, instantaneous interruption at the time of switching back , The service can be prevented from lowering.

[0012]

[Brief description of the drawings]

FIG. 1 is a block diagram of a switching module spare switching system according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 exchange 2 line trunk 3 distribution mechanism 4 distribution mechanism control unit 5 exchange module having OPS communication function 6 exchange module 7 spare exchange module 8 STM exchange module coupling mechanism 9 operation center 10 Subscriber line 11 Subscriber termination module 12 Signal line 13 Transmission line 14, 15 Line in exchange

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-240349 (JP, A) JP-A-3-14398 (JP, A) JP-A-57-26955 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H04M 3/22 H04Q 11/04

Claims (1)

(57) [Claims] 1. A subscriber termination module for terminating a subscriber line and a switching module accommodating an interoffice transmission line, wherein a rate of 1 call to n times of user information is used for transferring information between the switching modules. the STM exchange module linkage mechanism having a <br/> cross-connect function for switching the unit to a building block type exchanger constructed by bonding to each other, placed between the subscriber termination module and the switching module Sa
The dedicated STM sorting mechanism and the dedicated STM
And a virtual manner the installed pre-switching module, the switching module is at fault or the like, and aware of the analog subscriber and ISDN subscribers by the STM distributing mechanism
A switching module spare switching system, wherein the switching module is switched from the replacement module to the spare replacement module in a unitary manner without any change.