Sipitung,

Try this link for find info on SONET/SDH:

http://www.aloni.com/CND/CNDest.asp?TOCId=Telecom&TopicID=SONET


Simple Diagram:
(Drop) Term Multiplexer (Line)     Add Drop Multiplexer    IR    (Line) Term
Multiplexer (Drop)

Terminal - Terminates OC-n (Drop side and Line side)
Add/Drop - Allows one to Add/Drop channels mid-span
Intermediate Regenerator - (2R/3R) boosts and cleans signal for extra
length.


May want to familiar yourself with basic terms:  attenuation, dispersion,
non-linear effects, etc.

If you have any others questions, please email me at [EMAIL PROTECTED]

This link should be a good starting point...

Hope this helps!


Scott




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