YTD426B データシートの表示（PDF） - Yamaha Corporation

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YTD426B

ISDN U Interface (TCM mode)

Yamaha Corporation 

Chapter 1

INTRODUCTION

1.1 General Description

YTD426B is a communication LSI which provides the ISDN subscriber line interface (two-wire metaric time

compression multiplexing operation) and the NT side of the ISDN Basic Rate user-network interface function

(digital four-wire time-division full-duplex operation). It also provides the electric characteristics conforming

to TTC Standard JT-G961 and JT-I430.

A DSU (Digital Service Unit) can easily be constructed by combining with YTD427 (Analog Front End).

It is equipped with a B channel interface circuit and can easily realize the time-division multiplexing of the

B channel data on multiple ISDN lines.

In addition, with the Master/Slave function, leased lines and other lines which do not use the D channel can

be directly controlled (call origination, B channel control, loopback control) without using the S/T reference

point interface LSI (YTD418, YTD423B, etc.).

1.2 Features

1. Circuit Termination(CT)

 Conforms to TTC Standard JT-G961 and JT-I430

{ Two-wire metaric time compression multiplexing operation

{ Digital four{wire time{division full{duplex operation

{ Transmission rate at U reference point: 320 kbps, at T reference point: 192 kbps

{ Frame assembling and disassembling function

{ State transition control

{ Loopback function

{ U reference point driver control

{ T reference point timing control (switch between short passive bus and long passive bus, point{

to{point)

2. Line Termination(LT)

 Co{nfporfmesqtuoalTizTerC Standard JT-G961

{ Bridged Tap (BT) equalizer

 AFE (Analog Front End) Interface

{ AGC (Automatic Gain Control)

{ Data interface

3. B channel interface section

 B channel multiplexing circuit (LSI external clock 128k to 2,048 kHz)

3

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