KR910005498B1 - Apparatus for multiplexing isdn subscribers - Google Patents

Abstract

The apparatus processes four standard accesses with the speed of 400 kbps using the metal cable and jinterfaces directly with the S- interface. The distance between the NTE are expanded using this apparatus. The apparatus is operated as the COT/RT type to interface with the ISDN exchange. The apparatus comprises a subscriber interface unit (1) having the S-interface channel unit and U-interface channel unit, a common channel control unit (CCU) for collecting and transmitting the data transmitted from the subscriber interface unit and re-asigning the information channels to the subscriber interface unit (1), a common control unit (2) for processing and transmitting the control data transmitted from the subscriber interface unit to the common channel control unit.

Description

Small ISDN Subscriber Concentrator

1 is a block diagram of the present invention.

2 is a master-slave mode operating structure diagram of the present invention.

3 is a diagram of a COT-RT mode operation structure of the present invention.

4 is an embodiment of the configuration when the present invention is used as IMUX / COT.

5 illustrates one embodiment of a CCU portion of an IMUX / COT.

6 illustrates one embodiment of the CCU portion of IMUX / RT.

7 is a structural diagram of the ST bus

8 is a 400 Kbps frame format structure diagram.

9 is a B channel tangential and assignment configuration.

* Explanation of symbols for main parts of the drawings

1: subscriber access unit 2: common control unit

3: line interface unit 4: power unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small subscriber aggregation method (IMUX), and more particularly, to a small subscriber aggregation device having an ISDN (Integrated Information Communication Network) function of CCITT and concentrating up to 4 ISDN subscribers to be transmitted through a 4-wire metallic line.

In order to provide high quality voice and non-voice service in ISDN, D-channel protocol, a digital signaling method for digitization and service integration of the entire communication network including the existing subscriber line, is used.

The present invention was created to satisfy such a service, and it is possible to accommodate four basic accesses at a dedicated speed of 400 Kbps using an existing metal cable, and to perform a distance extension function of a narrow band subscriber access device (NTE). At the same time, it aims to directly accommodate the S-interface and to operate in a COT / RT method as a legal interface with the ISDN exchange.

In order to achieve the above object, the present invention includes an S interface channel unit and a U interface channel unit, and includes a subscriber access means for interfacing with an S line or a U line, and aggregates and transmits data information from the subscriber access means. Processing to receive and process the common channel control unit (CCU) for reallocating and transmitting the information channel to the subscriber access means and the control information from the subscriber access means, and to insert it into the data stream sent from the common channel control unit. A common control means having a CPU, a line interface means connected to the common control means so as to transmit and receive the channel information received from the means through an external four-wire line, and a power supply unit. It is.

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

1 is a block diagram of the present invention, where 1 is a subscriber connection, 2 is a common control unit, 3 is a line interface unit, and 4 is a power supply unit.

As shown in FIG. 1, the present invention is composed of a subscriber connection unit 1, a common control unit 2, a line interface unit 3, and a power supply unit 4. As shown in FIG.

The subscriber access unit 1 performs basic access functions of the ISDN, and is divided into two types of units, one for the S interface (SCU) and one for the U interface (UCU). S Interface Channel Unit (SCU) is configured to be fully compatible with CCITT Recommendation 1.430. have.

Maintenance information of D channel and C channel from NTE side is extracted from UCU and sent to CPU. The common control unit 2 has a CPU composed of a common channel control unit (CCU) for controlling a common signal in a device, a 16-bit microprocessor, and a peripheral circuit thereof.

The CCU has a 2.048 Mbps PCM signal interface function with a subscriber connection part, a 400 Kbps signal transmission function with a line interface part, and transmits and receives B channel aggregation, D channel, and maintenance alpha channel data by CPU control.

The line interface unit 3 is composed of an LTU having a 4-wire digital subscriber transmission function. The LIU performs the network side interface function and has the function of moving picture reception. The power supply unit 4 performs a function of supplying the power required to the device and the power required by the subscriber, and is composed of a power supply unit (PUS) and a backup (back up) battery.

The specification of the subscriber access interface and subscriber transmission interface in the present invention is as follows.

Figure 2 is a master-slave mode operation structure diagram of the present invention, in particular, NET (located between the narrow-band subscriber access device 5 and the NTE (8) operating in the master-slave mode, it is possible to extend the distance of the NTE. Here, the TE (terminal adapter) connected to the NTE (5,8) is an adapter for connecting the subscriber end to the NTE (5,8).

The 8B channel information from four NTEs (5) is aggregated into 5B channel information through a four-wire metallic line and transmitted at 400 kbps. 8B channelized to the NTE (8).

3 is a diagram illustrating the operation mode of the COT-RT mode of the present invention, and is also operated in the COT-RT mode to perform a universal interface function with an ISDN exchange. It is configured to operate in slave mode for IMUX / COT exchange (ET), and IMUX / RT is configured to operate in mast mode for IMUX / COT.

Here too, the 8B channel information coming from the exchange ET is sent to the IMUX / RT by tangentializing to the 5B channel information, and the IMUX / RT receives this, converts it into 8B channel information, and sends it to the NTE device.

4 is an exemplary embodiment of the configuration when the present invention is used as IMUX / COT.

When the present invention is used for COT-RT mode operation, the subscriber access unit 1 includes a SNU (synchronization circuit device), which maintains synchronization with each timing reproduced in four basic accesses on the COT side, and each UCU. Four different clock and frame signals from the circuit were selected and sent to the CCU and placed between the UCU and the CCU for use as reference signals.

The 4x2B + 4xD + α channel information coming from the U line of the exchange is sent from the UCU to the SNU and the 4xD + α signal is sent to the CPU.

It receives 8B channel information from SNU and sends 5B + 4D + α + F channel information to LTU through 400kbps line, and LIU receives it and sends it to IMUX / COT through external transmission line.

Here, alpha channel is a channel for transmitting / receiving maintenance and aggregation information between IMUX / COT and IMUX / RT, and F bit is a frame bit on a 400kbps signal.

5 is a relationship diagram showing a relationship between an embodiment of the configuration of the CCU portion of the IMUX / COT and another unit.

The 8B channel information from the UCC is tangentially transmitted to the 5B channel by the B channel timeslot assignment circuit 11 and transferred to the speed converter 12, and the speed converter 12 enters from the CPU through the D channel inserter 14. The 4D channel is converted into a buffer buffer memory circuit 13 by converting it with a 5B data channel at a speed of 400 kbps.

The buffer buffer memory circuit 13 receives this signal and inserts alpha channel information by the alpha channel inserter 15 on the line data format and sends it to the LIU at a speed of 400 kbps.

The signal from the IMUX / RT side is processed in the reverse order. The frame format of 400 kbps of line data is shown in FIG. 8, and an example of the allocation method in the b-channel timeslot assignment circuit 11 is shown in FIG.

6 is a relationship diagram showing an embodiment of a CCU portion of an IMUX / RT and a relationship with another unit.

The " 5B + 4D + α " channel signal transmitted from the IMUX / COT is separated by the D and α channel extractors 24 and B channel separator 21, respectively, and the 5B channel information is transmitted to the speed converter 22, 4D, and Channel information is sent to the CPU. The speed converter 22 receives this signal, converts it to a transmission rate of 2.048 Mbps, and sends it to the B-channel timeslot allocation circuit 23.

The B channel timeslot assignment circuit 23 converts the received 5B channel into an 8B channel and sends it to the UCU. The ST burn structure between the speed converter 22 and the B channel timeslot allocation circuit 23 is shown in FIG. The incoming signal from the UCU is processed in the reverse order of the process.

The present invention is configured as described above to accommodate the four basic access at the 400kbps transmission rate using the existing metal cable, to perform the distance extension function of NTE (Narrowband Subscriber Access Device) and at the same time directly to the S interface It can be used and can also be operated in a COT / RT mode as a universal interface with ISDN exchanges.

Claims (4)

Subscriber access means (1) having an S interface channel unit and a U interface channel unit so that it can be interfaced with an S line or a U line, and collect and send data information coming from the subscriber access means or information to the subscriber access means. A common channel unit (CCU) for reallocating and transmitting channels, and a CPU for receiving and processing control information from the subscriber access means and inserting it into a data stream sent from the common channel unit; Control means (2), the line interface means (3) connected to transmit and receive with the common control means to transmit and receive the channel information received from the means via an external 4-wire line, and the power supply unit (4) Small ISDN subscriber concentrator, characterized in that consisting of. 2. The small scale ISDN subscriber concentrator according to claim 1, wherein the subscriber access means (1) further comprises a synchronization circuit unit (SNU) to synchronize timing with the basic access signal. The data information coming from the subscriber access means (1) is composed of 8B channels, and the common channel second unit (CCU) condenses the channel information into 5B channels to the line interface means (3). Small ISDN subscriber concentrator, characterized in that the transmission. 2. The small scale ISDN subscriber concentrating device according to claim 1, wherein said subscriber access means (1) sends control channel D and? Channel information to said CPU.

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