Trend´s E1/T1 Guide

[mishka75]

Greetings to all!

Useful document Pocket Guide for E1 and PDH Testing provides information on:

1.PDH and T-carrier hierarchies
2.The E1 frame is the first hierarchy level.
3.The A multiplexer calculates and writes the CRC code, and the multiplexer B reads and
checks the code.
4.The PDH hierarchy
5.The higher PDH hierarchies. A bit-oriented justification process is used to fit tributaries
created with clock impairments.
6.PDH hierarchies are not synchronous, and variations can be expected in the bit rate clock -
in this case a justification mechanism is implemented.
7.When a multiplexer detects an LOS or LOF, it sends an RAI to its partner multiplexer
and forwards an AIS to the next NE.

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[eproly]

thanks you very much