KR20000039886A - Apparatus for processing d channel data in switching system - Google Patents

Abstract

PURPOSE: An apparatus for processing D channel data in a switching system is provided to divide transmitted message frames into D channel packet data and D channel signal data within a signal board. CONSTITUTION: An apparatus for processing D channel data in a switching system comprises an interface board(210) and a control board. The interface board divides an E1 frame applied from other station to a B/D channel, multiplexes a corresponding B/D channel. In addition, the interface board transmits the multiplexed corresponding B/D channel as a serial type through a data bus, and divides the B/D channel by demultiplexing transmitted data of the serial type. The control board controls the divided B/D channel data transmitted from the interface board.

Description

Dechannel Data Processing Unit in Exchange

The present invention relates to D channel data processing in an exchange. Particularly, a subscriber is required to process D-channel packet data and D-channel signal data in a single board by processing a message frame transmitted for subscribers to access a network in ISDN. D channel data processing apparatus in one exchange.

In general, ISDN (Integrated Service Digital Network) is a digitized communication network that provides various communication services such as voice, non-voice and video through one subscriber line, and the capacity of subscriber line between ISDN subscriber and network provider's switching center is Since it depends on the subscriber, the transmission structure of the subscriber line is configured by appropriately combining the ISDN channels. Here, the ISDN channel is a B channel and a D channel, the B channel is a basic user information channel, the communication speed is 64Kbps, one voice call, 64Kbps data or one voice call and low-speed data through the B channel. Can be transmitted in combination.

The D channel is used as a control information channel for transmitting circuit switched signal information on all B channels in a user network interface, and is also used as a transmission channel for low-speed data such as packet switched data or telemetry information. The transmission rate of the channel is 16 Kbps in the Basic Rate Interface (BRI) and 64 Kbps in the Primary Rate Interface (PRI).

In general, in the exchange, the D-channel data processing apparatus divides the message frame transmitted from another station through the trunk into B / D channel data, as shown in FIG. 1, and the corresponding D-channel is D-channel signal data. Separates the data into D-channel packet data and transmits and receives data according to mutual agreement.

The exchanger 200 separates an E1 frame received from another station into a B / D channel, and converts the corresponding D channel into an HDLC form to interface with the interface board 210 and the corresponding B received from the interface board 210. The control board 220 transmits the channel to the switching block 230, and the corresponding D channel extracts the header value, separates the D channel signal data and the D channel packet data, converts the signal into an HDLC form, and transmits the same to the switching block 230. And a switching block 230 for switching the B channel voice data, the D channel signal data, and the D channel packet data from the control board 220.

As shown in FIG. 2, the interface board 210 includes a frame processing unit 211 for converting an E1 frame received from another station into a frame form, and a B / received from the frame processing unit 211. A switching processing unit 212 for separating and switching the D channel, an HDLC frame processing unit 213 for converting the D channel received from the switching processing unit 212 into a frame form, and a D received from the HDLC frame processing unit 213. And a processor 214 for extracting the service identifier of the channel message frame and inserting a specific value into the corresponding message frame header to separate and transmit the D channel signal data and the D channel packet data.

As described above, briefly looking at the operation of the D-channel packet data processing in the conventional exchange, the subscriber is transmitted to the exchange 200 in the form of a message frame in order to receive a service by accessing the network in the ISDN, the corresponding exchange 200 In case of transmitting / receiving message frames transmitted from other stations in B / D channel packet data, the user information, control information, and parameters are converted into frames in the case of the corresponding D channel packet data.

First, when the E1 frame is transmitted from another station through a trunk in the interface board 210 in the switch 200, the frame processing unit 211 converts the E1 frame into a frame form in the corresponding interface board 210, thereby switching processing unit 212. And the switching processor 212 separates the message frame transmitted from the frame processor 211 into B channel voice data and D channel data, and switches the corresponding B channel voice data through the control board 220. The D-channel data is transmitted to the block 230, and the D-channel data is transmitted to the HDLC frame processor 213, and the D-channel data is converted into HDLC and transmitted to the processor 214.

Then, the processor 214 extracts the service identifier of the message frame received in HDLC format, and inserts a specific value with a length of 1 byte into the frame header of the D channel to distinguish the D channel signal data and the D channel packet data. To the control board 220 through the IPC.

Therefore, the control board 220 separates the D channel signal data and the D channel packet data according to a specific value attached to the frame header of the D channel data transmitted from the processor 214, and transmits the D channel signal data to the switching block 230. The switching block 230 transmits the transmitted D channel signal data to an upper processor, and the corresponding D channel packet data is switched to a packet handler.

As described above, in order to process D channel data in a conventional exchange, a service identifier of a message frame is extracted from an interface board, and a specific value is inserted into a header of the corresponding message frame to separate and transmit the D channel. In order to separate and transmit D-channel signal data and D-channel packet data according to a specific value of a frame header, an expensive one must be used as a processor of a corresponding control board.

The present invention has been made in view of the above-described problems, and in the exchange, B / D channel data processing separates the corresponding B / D channel from the interface board, and according to a specific value of the corresponding D channel header, D channel signal data D channel By separating the packet data and transmitting it by multiplexing with the corresponding B channel, the control board simply performs transmission control based on the separated B / D channel data. It is inexpensive and economical, and aims at enabling high speed data transmission and more stable data transmission.

In order to achieve the above object, the present invention, in the D-channel data processing apparatus in the exchange, after separating the B / D channel from the E1 frame applied from the other station, and multiplexing the corresponding B / D channel through the data bus An interface board for transmitting in serial form or demultiplexing data transmitted in serial form to separate a B / D channel and convert the interface into a frame form; And a control board for transmitting and controlling the B / D channel data transmitted separately from the interface board.

Meanwhile, the interface board separates and multiplexes D-channel signal data and D-channel packet data according to a specific value of a D-channel header applied thereto, and transmits the data to the control board 220 side as serial data or from the control board. And a controller for demultiplexing the serial data to separate and transmit the B / D channel.

1 is a block diagram illustrating a D-channel data processing apparatus in a general exchange.

Figure 2 is a block diagram showing a conventional interface board shown in FIG.

Figure 3 is a block diagram showing an interface board according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

200: exchanger 210: interface board

211: frame processing unit 212: switching processing unit

213: HDLC frame processor 214: processor

215: control unit 215a, 215b: multiplexing unit

220: control board 230: switching block

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

In the switch according to the embodiment of the present invention, the D-channel data processing apparatus is shown in FIG. 1, and the switch 100 receives the B-channel voice data, the D-channel signal data, and the D-channel packet data transmitted through a trunk from another station. In order to transmit and receive data in accordance with mutual agreement, the switch 100 separates an E1 frame applied from another station into B channel voice data, D channel signal data and D channel packet data, and then applies the corresponding B channel voice data and D channel signal. Multiplexing the data and the D channel packet data and transmitting the data in serial form through the data bus DB, or demultiplexing the B / D channel data applied from the control board 220 to the B channel voice data, the D channel signal data, and the like. After separating into D-channel packet data, the interface board 210 converts into a frame form and interfaces, and the B / D transmitted separately from the interface board 210. Control board 220 for transmitting the channel data to the switching block 230, or the data transmitted from the switching block 230 to the interface board 210, and switching the data transmitted from the control board 220 The switching block 230 is provided.

3, the interface board 210 includes a frame processor 211, a switching processor 212, an HDLC frame processor 213, a processor 214, and a controller ( 215).

Since the frame processor 211, the switching processor 212, the HDLC frame processor 213, and the processor 214 are the same as those of the conventional components, the description thereof is omitted.

The controller 215 extracts the header of the D channel data transmitted from the processor 214 in the form of a frame, separates the D channel signal data and the D channel packet data, and then through the first multiplexer 215a. Multiplexed, the B-channel data transmitted from the switching processing unit 212 and the D-channel data multiplexed through the first multiplexer 215b are multiplexed through a second multiplexer and transmitted through the data bus.

The operation of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, referring to an operation of separating and processing a message frame transmitted from another station into a B / D channel in the switch 200, the frame processing unit 211 in the interface board 210 transmits an E1 of 2.048Mps transmitted through a trunk from another station. The frame is converted into a frame and transmitted to the switching processor 212.

Accordingly, the switching processor 212 divides the frame transmitted from the frame processor 211 into B channel voice data and D channel data, and transmits the frame to the controller 215 in the case of the B channel voice data. The D-channel data is transmitted to the HDLC frame processing unit 213 to convert the corresponding D-channel data into HDLC format and transmitted to the processor 214.

Accordingly, the processor 214 extracts the service identifier of the frame received in the HDLC form, inserts a specific value with a length of 1 byte into the frame header of the D channel, and separates the D channel signal data and the D channel packet data. Transmission to the control unit 215 through the IPC.

Accordingly, the control unit 215 extracts a specific value of the D channel data header transmitted from the processor 214, and separates the D channel signal data and the D channel packet data into the D channel signal data and the D channel packet data. Is multiplexed through the first multiplexer 215a with a clock of 1.024Mhz, and then multiplexed through the second multiplexer 215b with a B-channel audio data transmitted from the corresponding switching processor 212 and a clock of 2.048Mhz. (DB) is transmitted to the control block 220 in the serial form.

Accordingly, the control block 220 transmits to the switching block 230 because the data transmitted from the control unit 215 is already separated according to the B channel voice data, the D channel signal data, and the D channel packet data. The switching block 230 is transmitted to each processing block.

On the other hand, the operation of separating the B / D channel at the exchange and processing the message frame to other stations, the interface board 210, the data is transmitted from the control board 220 via the data bus at 4Mbps, the corresponding data The B-channel audio data, the D-channel signal data and the D-channel packet data are transmitted in serial form, and the corresponding B-channel voice data is 2Mbps, and the D-channel signal data and the D-channel packet data are mixed each other at 1Mbps. Is sent to.

Accordingly, the control unit 215 in the interface board 210 demultiplexes the data applied from the control board 220 to separate the B / D channels, and then transmits the B channel voice data through the switching processor 212. When the D channel data is converted into the HDLC frame form by the HDLC frame processor 213 through the processor 214 and transmitted to the switching processor 212, the D processor 212 transmits the D channel data to the timeslot 16 of the frame. This is carried to the other station via the trunk via the frame processing unit 211.

As described above, in the exchange of the present invention, B / D channel data processing separates the corresponding B / D channel from the interface board, separates the D channel signal data and D channel packet data according to a specific value of the corresponding D channel header, and then applies the corresponding B / D channel data. By multiplexing and transmitting the channel, the control board simply performs transmission control based on the separated B / D channel data. As the processor function of the control board is simplified, the manufacturing cost is low and economical, and high speed data transmission. More stable data transmission is possible.

As described above, in the exchange of the present invention, the B / D channel data processing separates the corresponding B / D channel from the interface board, separates the D channel signal data and D channel packet data according to a specific value of the corresponding D channel header, By multiplexing with the corresponding B channel, the control board simply performs transmission control based on the separate B / D channel data. As the processor function of the control board is simplified, the manufacturing cost is low, economical, and high speed. Data transmission and more stable data transmission are possible.

Claims (2)

In the D-channel data processing apparatus at the exchange, After separating B / D channels from E1 frames applied from other stations, the B / D channels are multiplexed and transmitted in serial form through the data bus (DB), or the data transmitted in serial form is demultiplexed to B / D. An interface board 210 for separating and converting a channel into a frame form; And a control board (220) for controlling transfer of B / D channel data transmitted separately from the interface board (210). The method of claim 1, The interface board 210 separates and multiplexes the D-channel signal data and the D-channel packet data according to a specific value of the D-channel header applied thereto, and transmits the data to the control board 220 side as serial data, or the control board ( And a control unit (215) for demultiplexing serial data transmitted from (220) and separating and transmitting a B / D channel.