參數(shù)資料
型號(hào)： T7264
廠商： Lineage Power
英文描述： U-Interface 2B1Q Transceiver(U接口 2B1Q收發(fā)器)
中文描述： U型接口2B1Q收發(fā)器（ü接口2B1Q收發(fā)器）
文件頁(yè)數(shù)： 53/54頁(yè)
文件大?。?/td> 876K
代理商： T7264
Data Sheet
April 1998
T7264 U-Interface 2B1Q Transceiver
Lucent Technologies Inc.
53
Appendix B. Differences Between the T-7264- - -ML, T-7264- - -ML2, and
T-7264A- -ML Devices
Technology
The T-7264- - -ML device is a 0.9
μ
m CMOS technology device, while the T-7264- - -ML2 and the T-7264A- -ML are
0.6
μ
m CMOS technology devices.
Standard
In 1996, the European Telecommunications Standards Institute (ETSI) added a microinterruption immunity require-
ment 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 con-
stituting 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 the following:
I
A system shall tolerate a microinterruption up to t = 5 ms, when simulated with a repetition interval of t = 5 ms.
Since this is a new requirement, implementers were allowed until the end of 1997 to adhere to this requirement.
The T7264 device was upgraded to fully comply with this standard and the device was given an A suffix (T7264A).
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 requirement from 5 ms to 10 ms. The current
T7264A device from Lucent Technologies Microelectronics Group meets and exceeds this new requirement.
The above change to the transceiver has been fully verified, and test reports are available upon request.
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