Cell Relay Archive

[Paul Koning <pkoning@lucent.com>]

agallo@foghorn.nit.gwu.edu wrote:
> 
> Question about Synchronous residual Time Stamp (SRTS): is it required for
> implementing ATM over DS-3?  I have a microwave based DS-3 connecting two
> Marconi (FORE) 200BXs.  One side is receiving framing errors, the other side
> is relatively clean.  The radio vendor (Nortel) is claiming that SRTS will be
> required to make this link work.  The switch vendor agrees that it may solve
> the problem, but it is not required by the ATM Forum and customer demand
> for this feature is almost non-existant on native (non CES) DS-3.

I don't know much about SRTS either, but...

What AAL are you running?  AAL-1?  AAL-5?

When you say "framing errors" what exactly does that mean?
CRC errors at the AAL?  DS-3 physical layer errors?

In any case, I have my doubts about this.  If you get errors
on a link, fix the transmission problem that caused it.  If you
get it only in one direction, you may have a weak transmitter
or a weak (insensitive) receiver.  If there are two antennas,
one for each direction, one may be aimed wrong.  (If the two 
directions share a single antenna that wouldn't apply.)  There
may be problems with the cabling, or connectors.  Etc.

Try testing the setup with a DS-3 link tester; run a bit error
rate test.  If that shows problems, that's what you have to
fix -- and if so the solution has nothing to do with ATM.

	paul
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