KR20000007441A - V5.2 interface device in full electronic switching system - Google Patents

Abstract

PURPOSE: A device is provided to interface using a V5.2 interface protocol between various access networks accepting PSTN/ISDN subscribers of a remote place and a full electronic switching system. CONSTITUTION: The device comprises: a V5.2 E1 link matching unit(251) to perform a class 1 function and a class 2 function of a V5.2 protocol by interfacing by an access network and a physical E1 link; a main process unit(253) to manage a national protocol entity and a bearer channel allotment among a class 3 function of the V5.2 protocol; a telephony process unit(254) to interface between a class 3 message and the main process unit(253).

Description

A V5.2 interface unit in a digital switching system

The present invention relates to a V5.2 interface device, and more particularly, to a V5.2 in an all-electronic exchange that is installed in the all-electronic exchange and interfaces between an access network and the all-electronic exchange using the V5.2 interface protocol. Interface device (hereinafter referred to as V5.2 interface device).

FIG. 1 is a physical diagram of a V5.2 interface. The electronic switch 200 interfaces with each access network 100 using the V5.2 protocol.

The V5.2 interface, defined in ITU-T Recommendation G.965, is a signaling protocol that provides a standard interface from layer 1 to layer 3 between the access network 100 and the electronic switchgear 200. It is an open interface capable of accommodating a variety of access networks 100 for accommodating subscriber devices, wireless local loops (WLLs), private branch exchanges (PBXs), and other remote PSTN / ISDN subscribers.

This V5.2 interface has up to 16 E1 (2.048 Mbps) links per bundle, and 32 timeslots are assigned to each E1 link. Time slots 15, 16, and 31 of each E1 link can be used as physical communication channels, timeslots not assigned to a physical communication channel can be used as bearer channels, and channel 16 on the first and second links is protected. Include a protocol.

FIG. 2 is a schematic diagram of a functional model of the V5.2 interface, wherein the layer 3 protocol of the V5.2 interface is composed of a PSTN signaling protocol, a control protocol, a link control protocol, a protection protocol, and a bearer channel protocol.

Here, the PSTN signaling protocol is for transmitting signaling information of PSTN user ports in both directions, and the control protocol is information for changing user port status and user port control, frame allocation of 2.048 Mbits / sec link (E1 link), and multiframe. Control information regarding allocation, alert monitoring and CRC, information for controlling Layer 2 links and moving PSTN signaling, and information for controlling synchronization and restart capability of provisioning to provide general functionality.

The link control protocol is a protocol for bidirectionally transmitting information such as checking the status of the E1 link, blocking of the link by the management entity, and unblocking. The protection protocol is a communication channel based on the protection protocol, and is a protocol for bidirectionally transmitting information having k multiplexed structures in order to protect various types of information on a V5.2 interface when an E1 link is in use. In addition, the bearer channel protocol is a protocol for bidirectionally transmitting information such as allocation and release of a bearer channel.

3 is a structural diagram of a general electronic switch, the electronic switch 200 is composed of a plurality of ASS (Access Switching Subsystem), INS (230: Interconnection Network Subsystem), and CCS (240: Central Control Subsystem), It is connected to each access network 100 through the corresponding ASS.

The ASS is equipped with subscriber and trunk line interfaces, T-switches, Asynchronous Transfer Mode (ATM) switches, frame relay handlers, optical subscriber access devices, various signaling devices, packet handlers, etc. It performs processing functions, self operation and maintenance functions.

Such ASS is ASS-S (Subscriber) 210, ASS-T (Trunk 220), ASS-S / T (Subscriber / Trunk), ASS-7 (No. 7), ASS-P, depending on the application stage. (Packet), ASS-I (ISDN), ASS-ATM, ASS-F (optical subscriber access device), ASS-PCS, ASS-FR (Frame Relay) and the like.

On the other hand, the INS 230 is located in the center of the electronic exchanger 200 to perform the function of connecting the ASS between each other or between the ASS and CCS 240, by connecting the INS 230 and ASS in a point-to-point The master communicates between the INS 230 and each ASS (information exchanged between subscribers or information for use within the system) via a data link.

At this time, the end of the INS 230 side of the data link is referred to as a space switch data link (SSL), the end of the ASS side is referred to as a time switch link (TSL), and a control action between the CCS 240 and the INS 230. The link exists. In addition, the INS 230 performs a central function such as a space switch connection among call processing functions, and is also responsible for generating and distributing a system clock by providing a network synchronizer.

In addition, the CCS 240 performs the overall operation and maintenance of the electronic switch 200. In addition to system-level operation, maintenance, management, and statistical functions, it performs control of mass storage media (MT, CT, DAT, RDKU, disk), various input / output control with the operator, and interworking with other systems.

On the other hand, the electronic switch 200 and the access network 100 is conventionally connected using two wires, the above-described V5.2 interface by using the E1 line, it is possible to reduce the line and subscriber interface card, It can accommodate ISDN / PSTN exchange systems and all kinds of access networks, and is currently attracting attention both at home and abroad, and is preparing for development and commercialization in various countries.

Therefore, in order to connect between the access network 100 and the electronic switchboard 200 using the V5.2 protocol, the V5 mounted on the electronic switchboard 200 as one of the ASSs to efficiently realize the V5.2 interface. .2 interface device 250 is required.

Accordingly, the present invention has been devised to meet the needs as described above, is equipped as one of the ASS constituting the electronic switchboard 200, various access network 100 and electronic switchboard to accommodate the remote PSTN / ISDN subscriber It is an object of the present invention to provide a device for interfacing between the 200 using the V5.2 interface protocol, that is, a V5.2 interface device in an all-electronic exchange.

In order to achieve the above object, the V5.2 interface device in the electronic switch according to the present invention interfaces with a predetermined access network and a physical E1 link to perform layer 1 and layer 2 functions of the V5.2 protocol. A V5.2 E1 link matching unit; A main processor unit that performs bearer channel allocation and V5.2 system management among the layer 3 functions of the V5.2 protocol; A telephony processor unit for interfacing between the layer 3 message and the main processor unit among V5.2 protocol related messages; A function of exchanging time slots input / output from the V5.2 E1 link matching unit and a predetermined data link, providing a message exchange path between the processor of another sub-system constituting the telephony processor unit or an electronic switchgear and the main processor unit; A time switch link unit for performing pre / optical conversion (E / O) or pre / op conversion (O / E) function for data input / output through the predetermined data link; A layer 3 processor processing a V5.2 protocol layer 3 message, transferring user data between the time switch link unit and the V5.2 E1 link matching unit, and sending a management message to the telephony processor unit; A message switch connection unit providing an IPC channel between the main processor unit, the telephony processor unit, and another processor constituting the electronic switch; A service connection unit for providing a predetermined service signal to the V5.2 E1 link matching unit through the time switch link unit under the control of the telephony processor unit; And a trunk test unit configured to perform a test function on the V5.2 E1 link matching unit and to transmit failure information to the telephony processor unit when an alarm such as a cable hernia or a functional error occurs. .

In this case, the main processor, the telephony processor, the time switch link unit, the layer 3 processing unit, the message switch connection unit may be configured to have a redundancy structure of Active / Standby type.

1 is a physical diagram of a V5.2 interface,

2 is a schematic diagram of the functional model of the V5.2 interface;

3 is a structural diagram of a general electrical exchanger,

4 is a block diagram of a V5.2 interface device according to the present invention.

* Explanation of symbols for main parts of the drawings

100: access network 150: V5.2 interface link

200: electronic exchanger

210,220: Access Switching Subsystem (ASS)

230: Interconnection Network Subsystem

240: Central Control Subsystem (CCS)

250: V5.2 interface unit 251: V5.2 E1 link matching unit

252: Layer 3 processor 253: Main processor unit

254: telephony processor unit 255: service connection unit

256: trunk test section 257: time switch link section

258: message switch connection

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

FIG. 4 is a block diagram of a V5.2 interface device 250 in accordance with the present invention, which is equipped with one of the ASSs constituting the electronic switchboard 200 shown in FIG. To implement the V5.2 interface.

The V5.2 interface device 250 according to the present invention includes a V5.2 E1 link matching unit 251, a layer 3 processing unit 252, a main processor unit 253, a telephony processor unit 254, and a service connection unit 255. ), A trunk test unit 256, a time switch link unit 257, and a message switch connection unit 258.

The V5.2 E1 link matching unit 251 is a subscriber board performing layer 1 and layer 2 functions of the V5.2 protocol and interfaces with the access network 100 through a physical E1 link.

The V5.2 E1 link matching unit 251 interprets the envelope function frame information sent through the corresponding E1 link from the access network 100 and sends it to the layer 3 processing unit 252. Further, after arranging the user data from the time switch link unit 257 and the timeslot assignment information generated by the BCC process in the primary hierarchical signal frame, it connects to the V5.2 link at 2.048 Mbps. .

The layer 3 processing unit 252 controls the V5.2 E1 link matching unit 251 and processes messages related to layer 3 protocols such as control protocol, link control protocol, BCC protocol, protection protocol, and PSTN protocol, and is currently received. If the message is a management message, and serves to send this management message to the telephony processor unit 254.

In addition, the communication information received from the access network 100 through the V5.2 E1 link matching unit 251 is transmitted to the time switch link unit 257, or receives the user data from the time switch link unit 257 V5.2 The data is transmitted to the E1 link matching unit 251.

The main processor unit 253 is composed of a main processor that is in charge of traffic control, switch control, resource management, maintenance, maintenance, operation management, IPC message exchange, and the like of the V5.2 interface device 250. At this time, the main processor unit 253 may be configured in a redundant structure of Active / Standby type, thereby improving operation reliability of the V5.2 interface device 250.

The main processor unit 253 is a V5.2 interface related block and a block that manages V5.2 subscriber control software (VSC) blocks and bearer channel assignments in charge of V5.2 system management, resource management, and national protocol entity management. It is composed.

The telephony processor unit 254 controls the V5.2 E1 link matching unit 251 through the layer 3 processing unit 252, and divides the IPC U-Link matching function and the PCM data channel for communication with the main processor unit 253. Function, telephony fault detection function, serial communication function to monitor the system test and operation status of the processor.

In this case, the telephony processor unit 254 may be configured in a redundant structure of Active / Standby type, as in the case of the main processor unit 253, thereby improving operational reliability of the V5.2 interface device 250.

In addition, the telephony processor unit 254 has a serial communication function for monitoring the system test and operation status of the main processor unit 253, and the block in charge of the V5.2 function is referred to as V5.2 (V5.2 Subscriber Interface Software). It acts as an IPC channel between the Layer 3 message of the V5.2 protocol and the main processor 253.

Therefore, the management messages extracted by the layer 3 processor 252 among the messages received from the access network 100 are transmitted to the main processor 253 through the telephony processor 254.

The message switch connection 258 is between the telephony processor unit 254 and the main processor unit 253 of the V5.2 interface device 250 or the main processor of another subsystem such as the INS 230 or the CCS 240. And an IPC message channel to enable IPC message communication between the main processor unit 253 of the V5.2 interface device 250. In addition, when an abnormality occurs, the abnormal state is transmitted to the telephony processor unit 254 in the form of a message through the IPC communication channel.

That is, the main processor of the INS 230 or the CCS 240 is transmitted to the main processor 253 via the IPC channel provided by the message switch connector 258 via the time switch link unit 257.

The service connection unit 255 transmits and receives a related signal for signaling services such as R2, DTMF, CCT, and Tone to various access network subscribers and relay lines, and provides a voice service such as a conference call. At this time, the service connection unit 255 is driven under the control of the telephony processor unit 254.

That is, when the management message extracted by the layer 3 processor is a tone generation or voice service related message, the management message is transmitted to the service connection unit 255 through the telephony processor unit 254. Then, the corresponding service signal generated in the service connection unit 255 is transmitted to each subscriber via the time switch link unit.

The time switch link unit 257 performs time slot exchange for signals input and output from the V5.2 E1 link matching unit 251 and the data link (data exchange path between the time switch link unit and the INS).

The time switch link unit 257 performs multiplexing and demultiplexing of the PCM data, provides a message exchange path between the main processor unit 253 and the telephony processor unit 254, and provides an INS 230 or a CCS 240. It serves as a message exchange path between the processor of the other sub-system, such as) and the main processor unit 253. That is, the IPC message sent from the main processor unit 253 is inserted from the message switch connection unit 258, or the IPC message sent from the INS 230 or the CCS 240 is extracted, Performs a function of sending to the processor unit 253.

The INS 230 and the V5.2 interface device 250 perform pre / optical conversion (E / O) and pre / op conversion (O / E) functions. This is because the electronic switch 200 performs communication by light between the INS 230 and the V5.2 interface device 250.

The trunk test unit 256 performs a test function for the V5.2 interface link 150 and the V5.2 E1 link matching unit 251 under the control of the telephony processor unit 254, and the cable hernia or the functional error. If an alarm occurs, the corresponding failure information is transmitted to the telephony processor unit 254.

As described above, using the V5.2 interface device 250 according to the present invention, the V5.2 interface protocol between the various access network 100 and the electronic switchboard 200 to accommodate the remote PSTN / ISDN subscribers Can be interfaced using.

Claims (2)

A V5.2 E1 link matching unit 251 for interfacing a predetermined access network with a physical E1 link to perform layer 1 and layer 2 functions of the V5.2 protocol; A main processor unit 253 which manages a national protocol entity and bearer channel allocation among the layer 3 functions of the V5.2 protocol; A telephony processor unit 254 for interfacing between the layer 3 message and the main processor unit 253 among V5.2 protocol related messages; The exchange function of the time slots input and output from the V5.2 E1 link matching unit and a predetermined data link, between the processor of the other subsystem constituting the telephony processor unit 254 or the electronic switch and the main processor unit 253. A time switch link unit 257 for performing a message exchange path providing function, and performing pre / optical conversion (E / O) or pre / op conversion (O / E) for data input and output through the predetermined data link; Processes a V5.2 protocol layer 3 message, transfers user data between the time switch link unit 257 and the V5.2 E1 link matching unit, and sends layer 3 a management message to the telephony processor unit 254. A processing unit 252; A message switch connection unit for providing an IPC channel between the main processor unit 253, the telephony processor unit 254, and another processor constituting the electronic switchboard; A service connection unit 255 for providing a predetermined service signal to the V5.2 E1 link matching unit 251 through the time switch link unit 257 under the control of the telephony processor unit 254; And The trunk test unit 256 performs a test function on the V5.2 E1 link matching unit 251 and transmits fault information to the telephony processor unit 254 when an alarm such as a cable disconnection or a functional error occurs. V5.2 interface device in an electronic switch, characterized in that comprises a). The system of claim 1, wherein the main processor unit 253, the telephony processor unit 254, the time switch link unit 257, the layer 3 processor unit 252, and the message switch connector unit 258 are active / standby type redundant. A V5.2 interface device in an all-electronic exchange comprising a structure.