KR100263381B1 - V5.2 interface unit in a switching system - Google Patents

Abstract

PURPOSE: A V5.2 interface realizing apparatus is provided to interface between various access networks and a local exchange using a V5.2 interface protocol. CONSTITUTION: A V5.2 interface(311) is connected to an access network and a physical E1 link and transmits and receives a message. The V5.2 interface(311) processes an inputted message according to V5.2 layer 1 and layer 2 protocol. A device control part(312) exchanges a message with the V5.2 interface part(311) and processes the inputted message according to a V5.2 layer 3 protocol. A lower processor part(313) exchanges a V5.2 interface-related message and a state/alarm process message with the device control part(312) and outputs a message through an inter-processor communication(IPC). An upper processor(314) exchanges a message with the lower processor(313) through the IPC and performs API, call process, maintenance, statistics and charging functions.

Description

V5.2 interface unit in a switching system

The present invention relates to an apparatus for implementing a V5.2 interface in an exchange, and more particularly, to an apparatus for implementing a V5.2 interface that is installed in a local exchange and interfaces between an access network and a local exchange using a V5.2 interface protocol. . The V5.2 interface is an open interface that can accommodate a variety of access networks to electronic switchboards that accommodate optical subscriber devices, wireless local loops (WLLs), private branch exchanges (PBXs), and other remote PSTN / ISDN subscribers. In the past, the service between the exchange and the subscriber was used by using two wires, but the V5.2 interface is using E1 line, which is currently attracting attention from home and abroad due to the competitive advantage, and is preparing for commercial development in several countries. .2 To connect between the access network and the local exchange using the protocol, a V5.2 interface implementation is needed to realize the V5.2 interface.

Accordingly, the present invention has been made to meet the above needs, and is provided between an optical subscriber device, a wireless local loop (WLL), a private branch exchange (PBX), and various access networks and local exchanges to accommodate PSTN / ISDN subscribers of other remote locations. Its purpose is to provide a V5.2 interface implementation that interfaces with the V5.2 interface protocol.

In order to achieve the above object, the V5.2 interface implementing device in the exchange according to the present invention implements the V5.2 interface in the local exchange, by accessing an access network and a physical E1 link, A V5.2 interface unit for performing an operation of exchanging a message and outputting a message by performing processing related to the V5.2 layer 1 and layer 2 protocols; A device control unit for exchanging a message with the V5.2 interface unit, processing a V5.2 layer 3 protocol on the input message, and outputting the message; A lower processor unit for exchanging a V5.2 interface related message and a status / alarm processing message with the device controller and outputting a message through IPC if necessary; And an upper processor unit that performs functions such as API, call processing, maintenance, statistics, and billing while exchanging a message with the lower processor unit through the IPC.

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 block diagram of an exchange having a V5.2 interface implementation according to the present invention;

4 is a schematic diagram of a method of operating a V5.2 interface implementing apparatus;

FIG. 5 is a structure diagram of each layer regarding an API implemented in an upper application processor unit of a V5.2 interface implementing apparatus.

* Explanation of symbols for main parts of the drawings

110: access network 120: local exchange

130: V5.2 interface implementation device 131: V5.2 interface unit

132: device control unit 133: lower processor unit

134: upper processor unit

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

1 is a signaling protocol that provides a standard interface from Layer 1 to Layer 3 between the Access Network 110 and the Local Exchange 120 as defined in ITU-T Recommendation G.965. As a physical diagram for a V5.2 interface, a V5.2 interface has a maximum of 16 2,048 Kbps links per bundle, and 32 timeslots are allocated for each 2,048 Kbps link. Timeslots 15, 16, and 31 of each 2,048 Kbps link can be used as physical communication channels, and timeslots not assigned to a physical communication channel can be used as bearer channels, and channel 16 on the first and second links Protection 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.

The PSTN signaling protocol is for transmitting signaling information of PSTN user ports in both directions.

The control protocol provides information on user port status change and user port control, frame allocation of 2,048 Kbit / s link (E1 link), multiframe allocation, control information on alert indication and CRC, layer 2 link control and PSTN signaling. Information for moving, 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 a status of a 2,048 Kbit / s link, blocking a link, and unblocking by a management object.

The protection protocol is a protocol for transmitting information with k multiplexing structures in both directions in order to protect various information on the V5.2 interface when a 2,048 Kbit / s link is used as a communication channel by the protection protocol. .

The bearer channel protocol is a protocol for bidirectionally transmitting information such as allocation and release of a bearer channel.

3 is a block diagram of a switch having a V5.2 interface function according to the present invention, and provides a device for providing various tones or signals for the V5.2 interface implementer 310, the switching device 320, the access network subscriber and the relay line. Signaling device (321: Signaling device), Voice device for providing voice services such as announcement or conference call for subscriber service (Voice Device), Digital to perform the function of matching with the E1 relay line in conjunction with other exchanges A CEPT interface device 323, and a network synchronizer 324 for providing a network synchronizer to the system. The V5.2 interface implementer 310 according to the present invention provides V5.2 layer 1 and layer 2 services. V5.2 interface unit 311 for the device, the device control unit 312 for performing the layer 3 service, the lower processor unit 313 for performing real-time processing of the signal generated from the device control unit 312, call processing, The upper processor unit 314 performs high level tasks such as number translation, billing, maintenance, statistics, input / output device control, and interworking with a communication management network (TMN).

The V5.2 interface unit 311 is connected to the access network 110 through a physical E1 link, and performs an operation of exchanging substance messages. The V5.2 interface unit 311 provides a bearer channel and a communication channel, and the V5.2 interface with the device controller 312. It sends and receives messages related to and related to status / alarm processing, and provides V5.2 layer 1 and layer 2 services.

The V5.2 interface consists essentially of 16 E1 links, and the communication channel consists of three channels for the primary link and three channels for the secondary link, that is, at least six channels. do.

For example, if one V5.2 interface 311 accommodates 16 E1 links and has three primary channels and three secondary channels as communication channels, the subscriber capacity is 490 channels (16 E1 links × 32 channels-16 sync channels-3 primary communication channels-3 secondary communication channels). If the access network 110 accommodated 1000 subscribers, the local exchange 120 needs three V5.2 interface parts 311, and only three E1 links are needed for the link of the third module.

The device controller 312 receives the layer 1, layer 2 and MDL, MPH messages, and alarm / status messages from the V5.2 interface unit 311 and transmits the message to the lower processor unit 313 through the PCM bus. The MDU and alarm / status related messages are received from the lower processor unit 313 via the PCM bus.

The lower processor unit 313 exchanges a V5.2 interface related message and a status / alarm processing message with the device controller 312, and performs real-time processing on a signal generated from the device controller 312. Forward the message to the application program interface of 314). A PCM bus (2Mbps) is used as a communication path with the device controller 312, and a message is exchanged with an upper processor 314 through interprocessor communication (IPC).

The upper processor unit 314 performs high level functions such as an application program interface, call processing, maintenance, statistics, billing, and interworking with a Telecommunication Management Network (TMN). In order to perform V5.2 interface related call processing, message communication with other blocks is required. The upper processor unit 314 of the exchange is divided into several blocks, and IPC is used for communication with other sub systems. Send and receive messages. The application program interface receives a V5.2 interface related message through the IPC from the lower processor unit 313, and partly exchanges a message with an existing software block. It also exchanges messages with existing software blocks using IPC.

4 is a schematic diagram of a method of operating a V5.2 interface implementing apparatus according to the present invention, in which the device controller 312 processes Layer 3 of the V5.2 interface protocol, and application software used for operation of the exchange is subordinate. It is located in both the processor unit 313 and the upper processor unit 314, the upper processor unit 314 includes an application interface software (API).

The device controller 312 receives a layer 2 message of the V5.2 interface from the V5.2 interface 311 and then performs a process related to the layer 3 protocol of the V5.2 interface. The data after this processing is loaded on the PCM bus and transmitted to the lower processor unit 313. The data are already processed by the device control unit 312 in the layer 3 related processing of the V5.2 protocol, depending on the contents of the data. In this case, it is passed as it is, or transmitted to the upper application processor unit 314 through IPC.

The message transmitted to the upper processor unit 314 by the IPC is analyzed by the API in the upper application processor unit 314 and then transmitted to each software block according to the message content.

FIG. 5 is a diagram showing the inter-layer structure of each API related to the API implemented by the upper application processor unit 314 of the V5.2 interface implementing apparatus 310. The VSI (V5.2 Subscriber Interface Software) of the lower processor unit 313 is set to V5. .2 sending messages from Layer 3 to the V5.2 Subscriber Control Software (VSC) that performs API functions, and VSC sends the V5.2 Layer 3 related messages to the system administrator and requires an interface with existing application software. Through the ASI (Analog Subscriber Interface), the system manager is interfaced with existing application software. ASI is application software related to existing analog subscriber processing.

By operating the V5.2 interface implementer 310 in the above manner, by processing the layer 3 of the V5.2 protocol in the device controller 312, it is possible to quickly and accurately process the message processing in the lower layer. By reducing the load on the lower processor unit 313, more network resources can be provided to the application software, thereby facilitating the design of the API.

By using the V5.2 interface implementing device in the switch according to the present invention, various access networks and regions for accommodating an optical subscriber device, a wireless local loop (WLL), a private branch exchange (PBX), and other remote PSTN / ISDN subscribers The exchange can be effectively interfaced using the V5.2 interface protocol.

Claims (1)

In implementing the V5.2 interface at the local exchange, it connects to the access network through a physical E1 link, performs an operation of exchanging an actual message, and inputs a message to the V5.2 layer 1 and layer 2 protocols. A V5.2 interface unit 311 for performing a process related to the output; A device control unit 312 that exchanges messages with the V5.2 interface unit 311 and processes and outputs a V5.2 layer 3 protocol to the input message; A lower processor unit 313 for transmitting and receiving a V5.2 interface related message and a status / alarm processing message to the device controller 312 and outputting a message through IPC if necessary; And It is characterized in that it comprises a higher processor unit 314 for performing functions such as API, call processing, maintenance, statistics, billing while exchanging messages with the lower processor unit 313 through the IPC Device implementing the V5.2 interface at the exchange.

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