T7234A データシートの表示（PDF） - Agere -> LSI Corporation

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T7234A

Compliance with the New ETSI PSD Requirement

Agere -> LSI Corporation 

Data Sheet

January 1998

T7256 Single-Chip NT1

(SCNT1) Transceiver

Features

s U- to S/T-interface conversion for ISDN basic rate

(2B+D) systems

— Integrated U- and S/T-interfaces

— Operates in stand-alone mode to provide U- and

S/T-interface activation, control, and mainte-

nance functions

— Serial microprocessor and time-division multi-

plexed (TDM) bus interfaces for enhanced NT1

operation and voice/data ports

— Automatic embedded operations channel (eoc)

processing for ANSI T1.601 systems

— Low power consumption supporting line-pow-

ered NT1 (See table 45 on page 102, Question

and Answers section, #53 for detailed power

consumption information.)

— Idle-mode support (35 mW typical)

— Board-level testability support

s U-interface

— Conforms to ANSI T1.601 standard and ETSI

ETR 080 technical report

— 2B1Q four-level line code

— Automatic ANSI maintenance functions (quiet

mode and insertion loss mode)

s S/T-interface

— Conforms to ANSI T1.605 standard, ITU-T I.430

recommendation, and ETSI ETS 300 012 for NT

operation

— Supports point-to-point and point-to-multipoint

(passive bus) arrangements

— Supports S- and Q-channel multiframing opera-

tions (an external microprocessor is required for

S- and Q-channel multiframing support)

s Serial microprocessor and TDM bus interfaces

— Supports inexpensive serial microprocessor

— Supports direct codec connection and voice/

data ports

— Allows access to 2B+D data on TDM bus

s Other

— Single +5 V (±5%) supply

— –40 °C to +85 °C

— 44-pin PLCC

Description

The Lucent Technologies Microelectronics Group

T7256 Single-Chip NT1 (SCNT1) Transceiver inte-

grated circuit provides data (2B+D) and control infor-

mation conversion between 2-wire (U-interface) and

4-wire (S/T-interface) digital subscriber loops on the

integrated services digital network (ISDN). The

T7256 conforms to the ANSI T1.601 standard and

ETSI ETR 080 technical report for the U-interface

and the ITU-T I.430 recommendation, ANSI T1.605

standard, and ETSI ETS 300 012 for the S/T-inter-

face. The T7256 also supports digital pair gain and

terminal adapter applications. The single +5 V CMOS

device is packaged in a 44-pin plastic leaded chip

carrier (PLCC).

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