KR0163147B1 - Small size digital telephone exchanger - Google Patents

Abstract

Digital switching system according to the present invention is a subscriber block (ASI, DSI / PSI: 101, 108) to accommodate a general voice subscriber and a digital subscriber, a concentrator block (DLC: 102) performing a subscriber aggregation function, ISDN No. 7 functions Signaling device block 107 for performing the operation, global service device blocks 105, 106 for providing announcement and conferencing calls function, packet device block 107 for accommodating packet subscriber to provide packet data service, and synchronize clock to system It is composed of a network synchronizer block 110 to provide, and a workstation 200 that performs the operation and maintenance functions of the processor unit 111 that controls and performs all of these devices to provide a small capacity system at a low cost. Can be configured.

Description

Small capacity digital electronic exchanger

1 is a block diagram showing a typical large capacity digital electronic exchanger.

2 is a block diagram illustrating a small capacity digital electron exchanger according to the present invention.

* Explanation of symbols for the main parts of the drawings

100,100-1 ~ 100-19: Access Switching Subsystem (ASS)

110: Interconnection Network Subsystem (INS)

120: small capacity remote subscriber switching module (SRASM)

130: remote subscriber switching module (RASM)

140,200: Central Control Subsystem (CCS)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to digital electron exchangers, and more particularly to techniques for constructing small capacity exchangers at low cost.

In general, digital switchboards (eg, TDX-10 models) are connected to predetermined subscribers and multiplexed after PCM, as shown in FIG. Access switching subsystem (ASS: 100-1 to 100-19) connected to the interconnection network subsystem (INS) through a predetermined optical link after exchange of An interconnection network subsystem (INS: 110) for space switching on a highway basis; Remote access switching module (RASM) that consists of a central control subsystem (CCS) that monitors and controls the exchange system and performs the exchange function located in the same country, and accommodates small remote subscribers far from the country. 130 is connected to the ASS 100-19 through the PCM link. In addition, the small remote subscriber (SRASM: 120) is to be connected directly to the ASS (100-19) or to the ASS through the RASM (130).

And the ASS (100-1 ~ 100-19) for accommodating subscribers according to the type of service ASS-S for accommodating the general analog subscriber, ASS-T for accommodating the trunk, ASS for providing ISDN services -I, ASS-7 for providing service according to No.7 signaling protocol, ASS-P for providing packet switching service, etc. are divided into separate ASS connected to INS according to service. These services are managed by CCS.

In addition, in FIG. 1, the ASS 100-1 to 100-19 receives PCM data in units of 32 sub-highways from an ASI unit (not shown) that accepts subscribers, and multiplexes and demultiplexes a predetermined concentration ratio. A time switch section (not shown) for inputting / outputting data of 8.192 Mbps 10 bits (8-bit PCM data, 1-bit parity, 1-bit valid bit) by exchanging the timeslot accordingly. Add frame allocation word (FAW) and data for IPC to received 1K PCM data, convert CMI to optical signal, convert optical signal received from optical link to electrical signal, and then A local data link unit (not shown) for outputting to the time switch unit may be provided.

The interconnection network subsystem (INS) 110 is connected point-to-point via multiple ASSs and optical links, respectively, to form a communication path between INS and ASS, and 8.192Mbps data stream with SSW block (not shown). Central data linked with CI block (not shown) with 1.024xn (n = 1,2,4,8) Mbps bit stream, and NES block (not shown) with 65.520 MHz synthetic pulse. A link unit (not shown); A space switch unit (not shown) for space switching a 64x64 highway; A relay line / central data link unit (not shown) for linking the remote access switching module to the PCM link; A highway rate converter (not shown) for converting the rate of the relay line may be provided.

However, in the conventional digital electronic switch system as described above, one ASS can accommodate a maximum of 8K or 32K subscribers. Even if a single ASS is intended to accommodate a small capacity subscriber, INS and CCS are essential. Because of this requirement, the cost per line increases in a small configuration.

In other words, eliminating INS and CCS and accommodating a small number of subscribers with only one ASS will significantly reduce the cost per line in the construction of small digital switching systems.

Accordingly, the present invention has been made to solve the above problems, when constructing a small-capacity exchanger, eliminating the conventional INS, using a workstation instead of the CCS provides a small-capacity digital electronic exchanger that can be configured at low cost exchanger Its purpose is to.

The present invention to achieve the above object,

Time switch unit that receives subscriber side data and trunk side data and exchanges time slot after multiplexing and demultiplexing:

An analog subscriber matching unit for accommodating analog subscribers;

A digital collecting unit for collecting the output of the analog subscriber matching unit at a predetermined collecting ratio and outputting the output to the time switch;

A trunk matching portion connecting the trunk side to the time switch;

A voice message processing unit for recording or playing back a voice message and performing a self test function for maintenance;

A conference mixer for providing a trilateral call and conference call function;

A packet unit for providing signal processing and packet service functions;

A local service matching unit generating R2, DTMF, CCT, and Tone signals and transmitting the signals to the time switches, and receiving and detecting the signals from the time switches;

A digital subscriber matching unit that provides a 2B + D or 23B + D channel to an ISDN subscriber to access the ISDN subscriber;

A network synchronizer for providing a predetermined clock for synchronizing the network;

An access switching processor controlling the respective blocks to implement corresponding functions and communicating with an upper processor for charging and statistics; And

It is characterized in that the central control system for performing the maintenance and control function of the exchange system in conjunction with the access switching processor, and charging and statistical processing.

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

As shown in FIG. 2, the small-capacity digital electronic switch system according to the present invention comprises: a time switch unit (TSW) 103 which receives subscriber-side data and trunk-side data, multiplexes and demultiplexes, and exchanges time slots; An analog subscriber matching unit (ASI) 101 for accommodating analog subscribers; A digital condenser (DLC) 102 for condensing the output of the analog subscriber matching section 101 at a predetermined condensing ratio and outputting the condensing ratio to the time switch; A trunk matching unit (DTI / DCI: 104) for connecting the trunk side to the time switch 103; A voice message processor (VMH: 105) for recording or playing back voice messages and performing self-test functions for maintenance; A conference mixer (CMX: 106) for providing three-party and conference call functions; A packet unit (No. 7 / PKT: 107) for providing a No. 7 signal processing or packet service function; A local service matching unit (LSI) 109 which generates R2, DTMF, CCT, and Tone signals, sends them to the time switch 103, and receives and detects the corresponding signals from the time switch 103; A digital subscriber matching unit (DSI / PSI: 108) which provides ISDN subscribers with access to 2B + D or 23B + D channels; A network synchronizer (NES) 110 which provides a predetermined clock for synchronizing a network; An access switching processor (ASP) 111 controlling the respective blocks to implement corresponding functions and communicating with an upper processor for charging and statistics; And a central control subsystem (CCS) 200 for interworking with the access switching processor 111 to perform maintenance and control functions of the exchange system, and to perform billing and statistical processing. Here, the time switch unit 103, the analog subscriber matching unit 101, the digital collecting unit 102, the relay line matching unit 104, the voice message processing unit 105, the conference mixer 106, the packet processing unit 107, the digital The subscriber matching unit 108, the local service matching unit 109, the network synchronizer 110, and the ASP 111 are included in the ASS 100.

In addition, the central control subsystem 200 may be implemented as a workstation, and the relay line matching unit (DTI / DCI) 104 may be connected to the RASM 130 for accommodating a small number of remote subscribers. In this case, the remote access switching module (RASM) 130 may include a relay line matching unit (DTI / DCI: 131) of the RASM connected to the relay line matching unit 104 of the ASS; A control and timing unit 132 for connecting the remote subscriber to control the timeslot for exchange; It is composed of an analog subscriber matching unit 133 connected to the control and timing unit 132 to accommodate a remote subscriber.

Next, the operation of the present invention configured as described above will be described in detail.

The present invention is to improve the uneconomical problems when the conventional large-capacity exchanger accepts a small capacity, and to accommodate a small number of subscribers to economically perform various services.

That is, the system of the present invention performs basic voice exchange and packet exchange functions, provides ISDN subscribers, and provides various services according to the construction of a comprehensive communication network. In addition to providing services, it provides a high degree of flexibility in the exchange, processing, accumulation, and processing of information, enabling the exchange of non-voice data information and efficient network management.

The overall configuration of this system performs subscriber block (ASI, DSI / PSI: 101,108) that accepts general voice subscribers and digital subscribers, concentrator block (DLC: 102) that performs subscriber aggregation, and ISDN No. 7 functions. A signaling device block 107, a global service device block 105 and 106 for providing announcement and conference call functions, a packet device block 107 for receiving packet subscribers to provide packet data services, and providing a synchronous clock to the system. The network synchronizer block 110, and the workstation 200 for performing the operation and maintenance functions of the processor unit 111 that controls all these devices and performs a service.

The characteristic of such a system is to adopt the TT structure as the switch structure, and perform only the aggregation function of the subscriber at T at the front end, and the interchange function, aggregation and expansion function of the timeslot data input / output to the matching device of the subscriber and the relay line at the latter T. It is responsible for signaling, recording guidance, and connection of conference call devices with subscribers and relay line matching devices. In addition, the time switch 103 at the next stage directly connects with the No. 7 signal device 107 and the packet device 107 to transmit signal messages and packet data. Existing electronic switchboard has a separate time switch for accommodating regular subscribers for each subsystem, and for accommodating ISDN subscribers, accommodating No.7 signaling equipment, accommodating packet processing equipment, Although the system is operated with separate time switches, the small capacity exchanger of the present invention has a large time switch and a concentrator, and implements a structure capable of accommodating all functional devices by only one time switch.

The processor 111 that controls the system has only one main processor to control all the calls in the system. This improves the performance of the main processor by providing intelligence to each device, resulting in a simplified system that eliminates the processor that previously controlled the device.

Here, the main processor eliminates the complicated structure of INS by accommodating some of the INP and NTP functions in the existing INS, and can serve as a simple system of the existing ASP. Since the INP and NTP functions are always included in the INS of the conventional electronic switch, it is an effect that improves the uneconomical disadvantage that the INS should always exist even in a small capacity system requiring only one ASS.

In addition, the communication between the processor and the device selected a new global bus structure to perform communication between the main processor and intelligent peripheral devices. In the structure of the invention, a workstation is used for the conventional CCS, which is a LAN protocol between the main processor and the workstation by adding a LAN board in the main processor block.

This method has the advantages of easier configuration of development environment, convenient use of software, and easy connection with external systems. Connections to workstations are redundant for reliability.

As described above, in the configuration of a switch for a small number of subscribers (for example, 8K or less) according to the present invention, the cost per line can be reduced by removing the INS and implementing the CCS as a workstation.

Claims (4)

A time switch unit (TSW) 103 for receiving the subscriber side data and the trunk side data, multiplexing and demultiplexing, and exchanging timeslots; An analog subscriber matching unit (ASI) 101 for accommodating analog subscribers; A digital condenser (DLC) 102 for condensing the output of the analog subscriber matching section 101 at a predetermined condensing ratio and outputting the condensing ratio to the time switch; A trunk matching unit (DTI / DCI: 104) for connecting the trunk side to the time switch 103; A voice message processor (VMH: 105) for recording or playing back voice messages and performing self-test functions for maintenance; A conference mixer (CMX: 106) for providing three-party and conference call functions; A packet unit (No. 7 / PKT: 107) for providing a No. 7 signal processing or packet service function; A local service matching unit (LSI) 109 which generates R2, DTMF, CCT, and Tone signals, sends them to the time switch 103, and receives and detects the corresponding signals from the time switch 103; A digital subscriber matching unit (DSI / PSI: 108) for providing ISB subscribers with access to 2B + D or 23B + D channels; A network synchronizer (NES) 110 which provides a predetermined clock for synchronizing a network; An access switching processor (ASP) 111 controlling the respective blocks to implement corresponding functions and communicating with an upper processor for charging and statistics; And a central control system (CCS: 200) for performing maintenance and control functions of the exchange system, billing, and statistical processing in conjunction with the access switching processor (111). The small capacity digital electrical exchanger of claim 1, wherein the central control subsystem is implemented as a workstation. The small-capacity digital switching system of claim 1, wherein the relay line matching unit (DTI / DCI) 104 may be connected to a RASM 130 for accommodating a small number of remote subscribers. The apparatus of claim 3, wherein the remote access switching module (RASM) comprises: a relay line matching unit (DTI / DCI: 131) of the RASM connected to the relay line matching unit 104 of the ASS; A control and timing unit 132 for controlling the exchange of timeslots by connecting a remote subscriber; And an analog subscriber matching unit (133) connected to the control and timing unit (132) to accommodate a remote subscriber.