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From: yin@wesley.usc.edu (Ming Yin)
Newsgroups: comp.dcom.telecom
Subject: Questions on SONET
Message-ID: <telecom11.231.5@eecs.nwu.edu>
Date: 22 Mar 91 00:21:59 GMT
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X-Telecom-Digest: Volume 11, Issue 231, Message 5 of 12

Presently, I am involved in a project whose goal is to transport HIPPI
frames using SONET payload. After reading numerous articles on SONET,
I am still unclear on SONET standard. My questions are:

1) What is the algorithm used in scrambling STS-1 frames?

2) Given a STS-1 frames, by looking at the frame can one tell 
   if the STS-1 payload contains one DS3 signals or several
   DS1 signals? Or does it matter?

3) HIPPI interface has two different data rate - 800 Mbit/s and
   1,600 Mbit/s. This means that one should use STS-18 (933 Mb/s) 
   and STS-36 (1866 Mb/s), respectively. From what I can gather,
   the number of columns allocated to overhead is 3N for STS-N.
   This means that there are 54 and 108 columns allocated to
   STS-18 and STS-36, respectively. This is correct? If it is, then
   it seem to alot of waste of having 54 or 108 columns (translates
   to overhead of 40.104 Mb/s and 80.208 Mb/s) allocated to overhead
   for a single source.

Thanks in advance.


Ming Yin   yin@solar.usc.edu    yin@desperado.etdesg.trw.com