March 2004
Intermediate to advanced
840 pages
21h 45m
English
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A
- add/drop.
The process in which a part of the information carried in a channel is demodulated (dropped) at an intermediate point and different information is modulated (added) on to the channel for subsequent transmission.
- ADM (add/drop multiplexer).
Digital multiplexing equipment that adds and drops traffic in an optical network. The ADM also acts as a digital cross-connect switch.
- AIS (alarm indicating signal).
A code sent downstream indicating that an upstream failure has occurred. SONET defines the following four categories of AIS: Line AIS, STS path AIS, VT path AIS, and DS-N AIS.
- AMI (alternate mark inversion).
The line-coding format in transmission systems where successive 1s (marks) are alternatively inverted and transmitted with polarity ...
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