JPH0779224A - Wide band isdn terminal adapter - Google Patents

Abstract

PURPOSE:To centralize existing terminal housing by housing plural existing terminal line correspondence parts in a wide band ISDN terminal adapter. CONSTITUTION:In the example of map link in a direction from an existing terminal to a wide band network, the respectively different or the same kind of existing terminal interface signals R1-Rn are termination-processed by the existing terminal termination parts 31-3n of the respective existing terminal line correspondence parts 50-5n. Information as the output is converted to ATM cells by the cell assembly function of ATM cell assembly/disassembly parts 21-2n and outputted to the wide band line correspondence part 40 of a next stage. In the wide band line correspondence part 40 of this wide band ISDN terminal adapter 10, plural ATM cell trains from the respective existing terminal line correspondence parts 50-5n are outputted to the cell multiplexing function 11 of an ATM cell multiplexing/demultiplexing part 12. The wide band line termination function 11 converts the ATM cell trains to wide band line interface signals UNI, STM-1 frames for instance, and transmits them to the network.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention accommodates an existing terminal that does not support a broadband ISDN network,
The present invention relates to an adapter device for connecting to an SDN network.

[0002]

2. Description of the Related Art In recent years, ATM (Asynchronous)
Research and development of a wideband ISDN (Broadband ISDN) based on a Transfer Mode (basic technology) have been actively conducted.

This ATM system has various information formats (continuous /
Burst) and a wide range of information speeds (low speed / high speed), it is possible to integrate various terminals including existing terminals and multimedia terminals which will be newly developed in the future. It has become necessary to develop a wideband ISDN terminal adapter device that accommodates and makes full use of the ATM variable bandwidth capability.

[0004]

However, there has been no adapter device for accommodating such an existing terminal that does not support wideband ISDN and connecting it to the wideband ISDN network. Further, there is no adapter device that connects a plurality of existing terminals to the broadband ISDN network at once.

[0005]

Broadband ISDN of the present invention.
The terminal adapter device includes a plurality of existing terminal line corresponding units each including an existing terminal terminating unit for terminating an existing terminal interface signal and an ATM cell assembling / disassembling unit for converting information from the existing terminal terminating unit into ATM cells. AT for multiplexing / separating ATM cell information from the ATM cell assembling / disassembling unit
It is characterized in that it comprises an M cell multiplexer / demultiplexer and a wide band line terminating unit for converting an ATM cell into a wide band line interface signal, and has a smaller number of wide band line corresponding units than the existing terminal line corresponding units. .

[0006]

The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention.

According to this embodiment, the broadband ISDN terminal adapter device 10 includes a plurality of existing terminal line corresponding units 50, 5.
1, ..., 5n and one broadband line corresponding unit 40. Each existing terminal line corresponding part 50, 51,
..., 5n are existing terminal terminating units 31, 32, which have a function of terminating existing terminals that are not compatible with the broadband ISDN.
, 3n and ATM cell assembling / disassembling units 21, 22, ..., 2n having a function of assembling / disassembling ATM cells.

On the other hand, the wide band line corresponding unit 40 has a wide band I
Broadband line terminating unit 11 having SDN line terminating function
And the terminal portion 11 and the ATM cell assembling / disassembling portions 21, 2
2, ..., 2n are provided with an ATM cell multiplexer / separator 12 having an ATM cell multiplexer / separator function.

Next, the operation will be described. For convenience of explanation, the direction (uplink) from the existing terminal to the broadband ISDN network will be described first, and then the broadband ISDN network will be described.
The direction from the network to the existing terminal (downlink) will be described.

The different or the same type of existing terminal interface signals R1 to Rn are terminated by the known terminal terminating units 31 to 3n of the respective existing terminal line corresponding units 50 to 5n by various known methods, and their outputs are output. The information is converted into ATM cells by the cell assembling function of the ATM cell assembling / disassembling units 21 to 2n and output to the broadband line corresponding unit 40 at the next stage. In the broadband line corresponding unit 40, an AT including a plurality of existing terminal line corresponding units 50 to 5n
The M cell sequence is made into one ATM cell sequence by the cell multiplexing function of the ATM cell multiplexing / demultiplexing unit 12 and output to the broadband line terminating function 11 at the next stage. The wide band line terminating function 11 sends this ATM cell string to the wide band line interface signal UNI.
For example, it is converted into an STM-1 frame and transmitted to the network.

Next, the downlink will be briefly described. The broadband line terminal unit 11 is an STM from the network.
The -1 frame is received, converted into an ATM cell, and output to the demultiplexing function of the ATM cell multiplexer / demultiplexer 12. By this separation function, ATM cells are assembled into a plurality of ATM cell assembling / disassembling unit 2
It is output to the decomposition function of 1 to 2n. This decomposition function is AT
Of the M cell information, the information to the terminal side is taken out and output to the existing terminal terminating units 31 to 3n.
In 3n, the interface signal to the corresponding existing terminal is converted and transmitted to the existing terminal.

[0013]

As described above, the present invention is a broadband IS.
By accommodating a plurality of existing terminal line corresponding parts in the DN terminal adapter device, it is possible to centralize accommodation of existing terminal devices.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

[Explanation of symbols]

 10 Broadband ISDN terminal adapter device 11 Broadband line terminating unit 12 ATM cell multiplexing / separating unit 40 Broadband line corresponding unit 21 to 2n ATM cell assembling / disassembling unit 31 to 3n Existing terminal terminating unit 50 to 5n Existing terminal line corresponding unit UNI broadband line Interface signals R1 to Rn Existing terminal interface signals

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naoaki Tadokoro 1-4-2-4 Mita, Minato-ku, Tokyo Inside NEC Corporation (72) Inventor Fujio Nakagawa 1-4-28 Mita, Minato-ku, Tokyo No. NEC Communication System Co., Ltd.

Claims (1)

[Claims] 1. An ISDN terminal adapter device comprising: an existing terminal terminating unit for terminating an existing terminal interface signal not compatible with wideband ISDN; and an ATM cell assembling / disassembling unit for converting information from the existing terminal terminating unit into ATM cells. A configured to multiplex / separate a plurality of existing terminal line corresponding parts and ATM cell information from the ATM cell assembling / disassembling part
It is characterized by comprising a TM cell multiplexer / demultiplexer and a wide band line terminating unit for converting an ATM cell into a wide band line interface signal, and having a smaller number of wide band line corresponding units than the existing terminal line corresponding units. Broadband ISD
N terminal adapter device.