KR0124526Y1 - Isdn subscriber interfacing apparatus - Google Patents

Abstract

The present invention relates to a subscriber matching device for providing a service to a small remote subscriber of an ISDN network. In particular, the CEPT (European) for smoothing line registration between a subscriber terminal and an ISDN switching system using a V4 interface protocol of a PCM line By providing ISDN subscriber matching device using Conference of Postol and Telecommunications Administrations, various types of subscriber terminals are provided to remote small subscribers in ISDN network. It is effective in matching with exchange system and getting better service.

Description

ISDN subscriber matching device

1 is a block diagram of a conventional ISDN subscriber matching device.

2 is a block diagram of an ISDN subscriber matching device according to the present invention.

* Explanation of symbols for main parts of the drawings

110: DTI (Digital Trunk Interface) 120: T / S switching unit

130: DLCD (Data Link Controller Device)

140: HDLC (High Density Level Controller) matching unit

150: common memory

160: CPU (Central Processing Unit)

170: alarm signal detector 180: ROM (Read Only Memory)

190: address decoder 200: frame synchronization signal generator

210: ROM (Read Only Memory) 220: Control part

230: digital trunk interface unit

240: random access memory (RAM)

250: ISDN control signal matching unit 260: HDLC matching unit

270: integrated circuit unit 280: T / S switching unit

290: time switch line unit

This paper relates to ISDN subscriber matching device for providing services to small remote subscribers of the Integrated Services Digital Network (ISDN). In particular, the subscriber terminal and the host ISDN of the remote subscriber station using the V4 interface protocol of the Pulse Coded Modulation (PCM) line The present invention relates to an ISDN subscriber matching device using the European Conference of Postal and Telcommunications Administrations (CEPT) to facilitate line matching between switching systems.

In general, a device for line matching between conventional small remote subscribers and an ISDN switching system is configured as shown in Figure 1, which is a V4 interface of a PCM line from a remote small subscriber (e.g. PMUX-RT). The data received according to the protocol type is sent from the digital trunk interface (DTI) unit 110 to the T / S (time space) switching unit 120 in the form of a serial telecom (ST) bus and the T / S switching unit. In operation 120, data applied from the DTI 110 is divided into data of a B channel, a D channel, and a C channel. The T / S switching unit 120 transmits the B channel data of the separated data to the Data Link Controller Device (DLCD) 130 through the pre-sub highway, and the D and C channel data are HDLC ( High Density Level Controller (140) is applied to the matching unit 140. The D channel data is subjected to a link access protocol-D channel (LAP-D) process to distinguish whether the signaling data is packet data or the signaling data is HDLC frame format common memory. 150 is stored in a buffer of Que structure and transmitted to the next higher processor through the parallel bus, and the packet data is transmitted to the HDLC in the CPU 160.

In addition, the T / S switching unit 120 sets a frame and a multi-frame for the input data stream and transmits a remote alarm signal to a remote small subscriber through a PCM line in case of an alarm on a frame and carrier loss.

In addition, the alarm signal detection unit 170 for detecting an alarm signal for the carrier loss in the data stream input to the T / S switching unit 120 based on the frame synchronization signal applied from the frame synchronization signal generator 200 Extracts the frame bits to classify the frame and multiframe data to detect error conditions.

The ROM 180 stores data necessary for the operation of the CPU 160 and data generated during the operation.

The conventional device for line matching between small remote subscribers and the ISDN switching system operating as described above communicates with each other through a parallel bus using a common memory when communicating with an upper processor (ISB). If the parallel bus fails due to an increase in the number of parallel buses, there is a problem that communication with the upper processor is interrupted and reliability of the system is degraded, and data is sometimes broken during communication. In addition, PCM data rate that can be transmitted / received through Free Sub Highway (PSH) at system matching is 2.048 Mbps, and the capacity of 32 channels per Free Sub Highway (PSH) is limited to 32 channels. A necessary problem has occurred.

The present invention is devised to solve the above problems, and the purpose is to significantly reduce the signal line of the communication bus when communicating with the upper processor by transmitting / receiving data through two serial ports to the upper processor in the ISDN network. Increasing communication stability and communicating through the two serial buses in communication with the upper processor, even if one of the serial buses fails, communicating through the remaining serial buses, improving reliability in system operation and system matching By increasing the transmission rate of PCM data that can be transmitted / received through the Sea Preserve Highway (PSH) to 4.096 Mbps, it expands the receiving channel of each sub highway to 64 channels so that it can efficiently cope with the subscriber capacity increase. Voice and non-voice service to remote subscribers using tracks (including packets) It is to provide an ISDN subscriber matching device using the CEPT method that can easily provide.

A feature of the present invention for achieving the above object is an ISDN subscriber matching apparatus, comprising: a digital trunk interface unit for matching the remote subscriber to transmit / receive frame data to the remote subscriber; The frame data applied from the digital trunk interface unit is separately extracted and output into B channel data, D channel data, and C channel data, and the frame data is formed by combining B, C, and D channel data for transmission to a remote subscriber. A T / S switching unit for outputting to the digital trunk interface unit side; Time switch line unit for time-switching the data stream of the predetermined bit rate applied from the free sub highway (PSH) to the ISDN, receiving the data stream of the predetermined bit rate from the ISDN and outputting the data stream to the pre-sub highway (PSH) side. Wow; The B-channel data applied through the serial ports SP0 and SP1 from the T / S switching unit and the signaling data and packet data applied through the serial communication buses SC-BUS0 and SC-BUS1 are converted into data streams having a predetermined bit rate. Converts and outputs the data stream of a predetermined bit rate applied from the time switch line unit through the pre-sub highway PSH to the B-channel data, the signaling data, and the packet data. The B channel data is output to the T / S switching unit through serial ports SP0 and SP1, and the signaling data and packet data are output to the serial communication bus SC-BUS0 and SC-BUS1. An ISDN control signal matching unit; A ROM in which a program for controlling each device is embedded; RAM for storing data generated during system operation; After receiving the C and D channel data output from the T / S switching unit, the signaling data and the packet data are separated and extracted from the corresponding D channel data to perform a predetermined process, and then stored in the RAM and stored in the RAM. An HDLC matching unit which loads the signaling data and the packet data on the D-channel and applies the C-channel data to the T / S switching unit; Access the program stored in the ROM to control various items of the system and each device, and control the ISDN through the serial communication bus (SC-BUS0, SC-BUS1) through signaling data and packet data stored in the RAM. A control unit which applies to the signal matching unit side and stores signaling data and packet data applied from the ISDN control signal matching unit through a serial communication bus (SC-BUS0, SC-BUS1) in the RAM; And an integrated circuit unit integrating the control circuit, the system bus arbitration circuit, and the control signal generation circuit of each device.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment according to the present invention.

ISDN subscriber matching device according to the present invention is shown in Figure 2, ROM 210, control unit 220, digital trunk interface unit 230, RAM 240, ISDN control signal matching unit 250, An HDLC matching unit 260, an integrated circuit unit 270, a T / S switching unit 280, and a time switch line unit 290 are provided.

ROM 210 has a built-in program for controlling each device.

The controller 220 accesses a program stored in the ROM 210 to control various items of the system and each device, and controls the signaling data and packet data stored in the RAM 240 through a serial communication bus (SC-). Signaling data applied to the ISDN control signal matching unit 250 through BUS0 and SC-BUS1 and applied through a serial communication bus SC-BUS0 and SC-BUS1 from the ISDN control signal matching unit 250. And packet data are stored in the RAM 240.

The digital trunk interface unit 230 matches the remote subscriber to transmit / receive frame data to the remote subscriber.

The RAM 240 stores data generated during system operation.

The ISDN control signal matching unit 250 is applied through the B channel data and the serial communication buses SC-BUS0 and SC-BUS1 applied from the T / S switching unit 280 through the serial ports SP0 and SP1. Converts signaling data and packet data into a data stream of a predetermined bit rate, outputs the signal to the time switch line unit 290 through a pre sub highway (PSH), and the time switch line unit 290 through a pre sub highway (PSH). The data stream of a predetermined bit rate applied from the B channel data, the signaling data and the packet data are separated and extracted, and the corresponding B channel data are outputted to the T / S switching unit 280 through serial ports SP0 and SP1. The signaling data and the packet data are output to the serial communication buses (SC-BUS0, SC-BUS1).

The HDLC matching unit 260 receives C and D channel data output from the T / S switching unit 280 and separates signaling data and packet data from the corresponding D channel data to perform a predetermined processing process. The RAM 240 stores the signaling data and the packet data stored in the RAM 240 on the D channel and applies the C data to the T / S switching unit 280 along with the C channel data.

The integrated circuit unit 270 integrates a control circuit, a system bus arbitration circuit, and a control signal generation circuit of each device.

The T / S switching unit 280 separately extracts and outputs the frame data applied from the digital trunk interface unit 230 into B channel data, D channel data and C channel data, and transmits the B and C to the remote subscribers. Combining D channel data forms frame data and outputs the frame data to the digital trunk interface unit 230.

The time switch line unit 290 time-switches a predetermined rate of data streams applied from the pre-subhighway (PSH) to the ISDN, and receives a data rate of a predetermined bit rate applied from the ISDN to receive the pre-sub highway. Output to (PSH) side.

Referring to the preferred operation of the ISDN subscriber matching device according to the present invention configured as described above in detail as follows.

The controller 220 initializes each device to operate normally through a program stored in the ROM 210. Thereafter, the frame data received in units of 12 (2B + D) subscribers conforming to the protocol of the V4 interface on the PCM line is rearranged in the digital trunk interface unit 230 to conform to the ST bus type.

Frame data received in units of 12 subscribers from the remote subscriber is arranged in the form of (2B + D + C) on the ST bus and separated and extracted into B, C, and D data by the T / S switching unit 280, The separated D and C channel data are transmitted to the HDLC matching unit 260, and the B channel data is transmitted in an ISDN control signal matching unit 250 to the time switch line unit 290 through a pre-sub highway (PSH) in units of 4.096 Mbps. 32 channels are transmitted to the ISDN control signal matching unit 250 at the rate of 2.048 Mbps through 32 serial channels (SP0 and SP1) so that they can be transmitted in a low frequency (64-channel capacity).

Accordingly, the ISDN control signal matching unit 250 converts PCM data received from the T / S switching unit 280 in units of 2.048 Mbps into units of 4.096 Mbps through two serial ports SP0 and SP1. To the time switch line unit 290 through the pre-sub highway PSH.

In addition, the D and C channels separated by the T / S switching unit 280 are applied to the HDLC matching unit 260 through the ST bus and the IOM-2 bus interface logic. At this time, the D-channel data applied to the HDLC matching unit 260 performs a LAPD operation in Layer 2 and then separates the D-channel signaling data and packet data by a SAPI (Service Access Point Identifier). The signaling data separated by the above-described process is converted into HDLC frame format and stored in the RAM 240 as a first-in first-out queue (QUE) method, which is a serial bus (SC) which is a serial bus through the serial port of the controller 220. By using a bus (SC-BUS0 or SC-BUS1) is transmitted to the ISDN control signal matching unit 250, the packet data is LANPD processing in the layer 2 is stored in the physical layer buffer of the layer 1 after data framing.

At this time, the data stored in the physical layer buffer of the layer 1 is read and transmitted to the HDLC in the controller 220. The HDLC is the ISDN control signal matching unit through a separate SC bus (SC-BUS0 or SC-BUS1). Send to 250.

The operation of the SC bus (SC-BUS0 or SC-BUS1) transmits and receives data at 256kbps level and operates the packet data port and the signaling data port independently. The SC bus arbitration circuit can be controlled inside the integrated circuit unit 270.

On the other hand, the reverse process of the above-described content, that is, the data transmission process to the remote terminal is also the same as the above process.

As described above, the present invention significantly reduces the signal line of the communication bus by transmitting / receiving data through an upper processor and two serial ports SP0 and SP1 in the ISDN network, thereby increasing communication stability and reliability through redundancy. By increasing the transmission rate of PCM data that can be transmitted and received through Free Sub Highway (PSH) to 4.096 Mbps and extending the channel per sub highway to 64 channels, voice and remote subscribers using the PCM line in ISDN network Non-voice service (including packet) can be easily provided.

Claims (2)

An ISDN subscriber matching device, comprising: a digital trunk interface unit (230) for matching a remote subscriber to transmit / receive frame data to a remote subscriber; The frame data applied from the digital trunk interface unit 230 is separately extracted and output into B channel data, D channel data and C channel data, and the B, C and D channel data are combined to be transmitted to the particle by the remote site. A T / S switching unit 280 for forming data and outputting the data to the digital trunk interface unit 230; A time switch line unit for time-switching a data stream of a predetermined bit rate applied from a free sub highway (PSH) to the ISDN, and receiving a data stream of a predetermined bit rate from the ISDN and outputting the data stream to the pre sub highway (PSH). 290; The B-channel data applied from the T / S switching unit 280 through the serial ports SP0 and SP1 and the signaling data and packet data applied through the serial communication buses SC-BUS0 and SC-BUS1 have a predetermined bit rate. Converts to a data stream and outputs it to the time switch line unit 290 through a pre-sub highway PSH, and a data bit of a predetermined bit rate applied from the time switch line unit 290 through a pre-sub highway PSH. Separately extract B channel data, signaling data and packet data, and output the corresponding B channel data to the T / S switching unit 280 through serial ports SP0 and SP1, and the corresponding signaling data and packet data are serially communicated. An ISDN control signal matching unit 250 for outputting to the buses SC-BUS0 and SC-BUS1; A ROM 210 in which a program for controlling each device is embedded; RAM 240 for storing data generated during system operation; After receiving the C and D channel data output from the T / S switching unit 280, the signaling data and the packet data are separately extracted from the corresponding D channel data to perform a predetermined process and stored in the RAM 240. An HDLC matching unit 260 for loading signaling data and packet data stored in the RAM 240 to the T / S switching unit 280 along with the C channel data; Access the program stored in the ROM 210 to control the general matters of the system and each device, and the signaling data and packet data stored in the RAM 240 to the serial communication bus (SC-BUS0, SC-BUS1) The signaling data and the packet data applied to the ISDN control signal matching unit 250 side through the serial communication bus (SC-BUS0, SC-BUS1) from the ISDN control signal matching unit 250 side through ISDN subscriber matching device comprising a control unit (220) for storing in the RAM (240). The ISDN subscriber matching device according to claim 1, further comprising an integrated circuit unit (270) integrating a control circuit, a system bus arbitration circuit, and a control signal generation circuit of each device.