KR20020069433A - Switch network part device of electronic switching system - Google Patents

Abstract

PURPOSE: A switch system in a full electronic telephone exchange is provided to design an SSL(Space Switch Logic) in the form of a double plane so as to secure a detour route, in case that a fault is generated, and to easily achieve the recovering and maintenance of the fault. CONSTITUTION: A TSL(Time Switch and Local data link)(100) in each ASS(Access Switching Subsystem) is divided into the first TSL block(100a) and the second TSL block(100b). An SSL is composed of the first SSL(200a) and the second SSL(200b), designed in the form of a double plane so as to secure a detour route in case that a fault is generated from either side. The TSL blocks(100a,100b) of the TSL(100) are correspondingly connected with the first SSL(200a) and the second SSL(200b). At this moment, the first SSL(200a) and the second SSL(200b) are separated so as not to be signally connected each other.

Description

Switch system of electronic exchange {SWITCH NETWORK PART DEVICE OF ELECTRONIC SWITCHING SYSTEM}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switch system of an electronic exchange, and more particularly, to an electronic structure in which a time slot switching logic (TSL) as a time division switch and an SSL (space switch logic) as a space division switch are designed in a dual structure. A switch system device of an exchanger.

As is well known, electronic exchanges provide a variety of forms of communication, including the transmission of voice and / or data based on uniquely assigned call numbers by a plurality of subscriber stations. In response to the call connection request generated from the terminal includes a switch network (Switch Network Part) for connecting the communication path between the calling party and the called party terminal.

Fig. 1 is a block diagram illustrating the configuration of a general electronic exchange. The electronic exchange can be expanded as a horizontally distributed structure, and a predetermined number of subscriber terminals 10 are connected to each other so that a call processing function, a number translation function, and an own M & A can be obtained. A plurality of Access Switching Subsystems (ASS) 20 performing a function are included.

The ASS 20 is provided with a TSL (Time Switch & Local Data Link) 30 as a hardware block functioning as a time division switch, and the TSL 30 is a time slot exchange function or a relay line matching, It will perform analog subscriber and digital subscriber matching, aggregation function, provision of interprocessor communication (IPC) path, and optical matching function.

In addition, referring to FIG. 1, an electronic exchange is located at the center of the exchange and includes a centralized call control system (CCS), which will be described later, including the ASS 20, and, if necessary, a centralized call connected between the Location Registration Subsystem (LRS). An Interconnection Network Subsystem (INS) 40 that performs the processing is included.

The INS 40 includes a space switch & link (SSL) 40a as a time division switch for interconnecting the TSLs 30 configured in the plurality of ASSs 20 in a spatial matrix to perform space switching. do.

In addition, the electronic exchange shown in FIG. 1 is also provided with a Central Control Subsystem (CCS) 50 as a subsystem for performing overall operation and maintenance functions of the corresponding exchange.

Referring to FIG. 2, the TSL 30 in the ASS 20 and the SSL 40a in the INS 40 are designed in a so-called 'TS-T' method in consideration of a simple configuration and processing of a large amount of traffic. Matched with an optical cable via an interface.

However, the 'TS-T' type switch system employed in the electronic exchange shown in FIG. 1 is provided from the TSL 30 of the ASS 20 to which a call signal (for example, PCM data) from a specific subscriber station 10 corresponds. It acts to switch to the TSL of the ASS of the call signal transmission target (see Fig. 2) through the SSL 40a of the INS 40, in the state where the SSL 40a is designed as a single plane. If the SSL 40a fails, a bypass will not be designed and a significant failure will occur in the operation of the exchange system.

That is, in the electronic exchange employing the single-layer SSL 40a, if a failure occurs during the operation of the SSL 40a, the space-switching switching from one TSL 30 to another TSL 30 becomes impossible. Not only will it cause serious obstacles to the operation, but it will also adversely affect the service for the establishment of the existing communication path during the maintenance, and in the severe case, the service may be interrupted.

Moreover, because of the massive matrix of interconnected highway cables in the large-capacity SSL 40a, if such a failure occurs while the SSL 40a is designed in a single structure, it is difficult to find the exact point of failure as well as maintenance. Considerable difficulty is incurred.

The present invention has been made in view of the above-described prior art, and the space splitting switch employed in the electronic exchange is designed in a double plane so that a bypass route can be secured even in the event of a failure, and the recovery and maintenance of the failure are easy. It is an object of the present invention to provide a switch system structure of an electronic exchange which is to be terminated.

In order to achieve the above object, according to a preferred embodiment of the present invention, a switch of an electronic switch having a TSL (Time Division Switch) in a plurality of ASS to which subscriber terminals are connected, and an SSL (Space Division Switch) that is optically matched to the TSL. In the system structure, the SSL is composed of the first and second SSL of the binary structure, the switch system of the electronic switch is provided with a constant capacity of the TSL cable is connected to the first and second SSL.

Preferably, according to the present invention, the first and second SSLs are mutually separated from each other.

In the switch system structure of the electronic exchange according to the present invention described above, a constant capacity (that is, 1/2 capacity of a corresponding TSL) for each of the first and second SSLs is connected by a cable, and in a specific TSL, The originating call from the calling party's terminal is distributed to the TSL side to which the called party's terminal belongs via SSL on either side or SSL on both sides.

1 is a block diagram illustrating a configuration of a general electronic exchange;

FIG. 2 is a view illustrating a call connection process by TSL (time division switch) and SSL (space division switch) of a T-S-T method included in the electronic exchange shown in FIG. 1;

3 is a block diagram showing a switch system structure of an electronic exchange according to a preferred embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: subscriber terminal, 20: ASS,

30: TSL, 40: INS,

40a: SSL, 100: TSL,

100a, 100b: TSL block, 200a, 200b: SSL.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

3 is a block diagram showing a switch system of an electronic exchange according to the present invention.

Referring to the drawings, the TSL 100 configured in each ASS (20 in FIG. 1) has a constant capacity (preferably 1/2) in the form of first and second TSL blocks 100a and 100b. It is preferable if the design is divided into.

More preferably, according to the present invention, SSL is designed as a dualization structure (200a; 200b) to ensure the bypass route in the event of any one of the failures.

The first and second TSL blocks 100a and 100b of the TSL 100 are cabled correspondingly to the first and second SSL 200a and 200b of the dual structure.

Here, the first and the second SSL (200a; 200b) is not connected to each other signally so that the call from the first or second TSL block (100a or 100b) through the cable corresponding to either side of the SSL (200a) Or 200b) or via SSL (200a; 200b) on both sides.

Therefore, in the switch system structure of the electronic switch according to the present invention of the above apparatus, the call originating from the calling subscriber terminal is transmitted to the corresponding side via the TSL block 100a or 100b of either side of the specific TSL 100. It is distributed to the TSL 100 to which the called party's terminal belongs via the first or second SSL 200a or 200b or the SSLs 200a and 200b of both sides, and communicates between the calling party and the called party. The path is set.

In the switch system structure of the electronic switch according to the present invention having the above-described configuration, when a failure occurs in any one of the SSL 200a; 200b of the dual structure, the communication path can be set through the normal SSL until recovery to the normal state. This eliminates the interruption of service even in the event of a failure.

In addition, it is possible to secure twice the capacity even with a single cable configuration, thereby maximizing maintenance and cost reduction of the exchange system.

As described above, according to the switch system structure of the electronic exchange according to the present invention, while designing SSL (Space Division Switch) as a dual device, a predetermined capacity of each TSL (Time Division Switch) is cabled so as to correspond to SSL of the dual structure. This makes it easy to maintain during operation, and even if any one SSL failure occurs, service interruption can be eliminated as much as possible.

Claims (2)

In the switch system device of an electronic exchange having a Time Switch & Local Data Link (TLS) in a plurality of ASS (Access Switching Subsystem) connected to the subscriber terminal and SSL (Space Switch & Link) that is optically matched to the TSL, The SSL is composed of first and second SSLs of a binary structure; Switch system of the electronic switch, characterized in that the constant capacity of the TSL is cabled to the first and second SSL. The switch system of claim 1, wherein the first and second SSLs are separated from each other by signal.