T7234 데이터 시트보기 (PDF) - Agere -> LSI Corporation

부품명

상세내역

일치하는 목록

T7234

Compliance with the New ETSI PSD Requirement

Agere -> LSI Corporation 

Advisory

July 1998

T7234, T7237, and T7256

Data Sheet Advisory

(Refer to the T7234, T7237, and T7256 ISDN transceiver data sheets.)

The Technology and Telecommunications Standard sections below denote the differences between the T7234,

T7237, and T7256 and the T7234A, T7237A, and T7256A.

Technology

s The T-7234- - -ML, T-7237- - -ML, and T-7256- - -ML2 are 0.9 µm CMOS technology devices.

s The T-7234A- -ML, T-7237A- -ML, and T-7256A- -ML are 0.6 µm CMOS technology devices.

Telecommunication Standard

In 1996, the European Telecommunications Standards Institute (ETSI) added a microinterruption immunity

requirement to ETR 080 (Sections 5.4.5 and 6.2.5).

Section 5.4.5 in ETSI ETR 080 states the following:

s A microinterruption is a temporary line interruption due to external mechanical activity on the copper wires

constituting the transmission path.

s The effect of a microinterruption on the transmission system can be a failure of the digital transmission link.

s The objective of this requirement is that the presence of a microinterruption of specified maximum length

shall not deactivate the system, and the system shall activate if it has deactivated due to longer interruption.

Section 6.2.5 in ETSI ETR 080 states that:

s A system shall tolerate a microinterruption up to t = 5 ms, when simulated with a repetition interval of

t = 5 ms.

The SCNT1 family of U-interface transceivers was upgraded to fully comply with this standard. The devices

have been given an A suffix (T7234A, T7237A, and T7256A).

A proposal was added to the Living List (which is intended to collect issues and observations for a possible

future update of ETSI ETR 080) to change the value of the microinterruption from 5 ms to 10 ms. The current

SCNT1 family of U-interface transceivers (T7234A/T7237A/T7256A) from Lucent Technologies Microelectron-

ics Group meets and exceeds this new requirement.

The above change to the SCNT1 family of transceivers has been fully verified, and test reports are available

upon request.

Share Link: