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參數資料
| 型號： | T7256A |
| 英文描述： | Compliance with the New ETSI PSD Requirement |
| 中文描述： | 符合新的ETSI PSD的要求 |
| 文件頁數： | 3/116頁 |
| 文件大?。?/td> | 1056K |
| 代理商： | T7256A |
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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
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The T-7234- - -ML, T-7237- - -ML, and T-7256- - -ML2 are 0.9 μm CMOS technology devices.
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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:
I
A microinterruption is a temporary line interruption due to external mechanical activity on the copper wires
constituting the transmission path.
I
The effect of a microinterruption on the transmission system can be a failure of the digital transmission link.
I
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:
I
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.
相關PDF資料 |
PDF描述 |
|---|---|
| T7288 | CEPT/E1 Line Interface(CEPT/E1 線接口) |
| T7290A | DS1/T1/CEPT/E1 Line Interface(DS1/T1/CEPT/E1 線接口) |
| T7295-1 | E3 Integrated Line Receiver(E3 集成線接收器) |
| T7295-6 | DS3/SONET STS-1 Integrated Line Receiver(DS3/SONET STS-1 集成線接收器) |
| T7296 | Integrated Line Transmitter(集成PCM線傳送器) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| T7257 | 制造商:TE Connectivity 功能描述: |
| T-726 | 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:ADSL Line Interface Transformers |
| T7263 | 制造商:TE Connectivity 功能描述: |
| T7263A | 制造商:Toshiba America Electronic Components 功能描述:T7263A |
| T7264 | 制造商:TE Connectivity 功能描述: |
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