Cell Relay Archive

[Koen Peeters <koen.peeters@ciminko.be>]

I believe your problem is from a completely different type.

SRTS is an AAL1 mechanism used to provide timing control for a clear
channel transported over an ATM connection. It is a connection Mechanism
and not a link mechanisme.

Link 		: physical medium between 2 switches.
Connection 	: virtual channel used for transporting information between
2 network endpoints.

Most likely the microwave link requires a synchronous timing.
This means that one ATM switch (or possibly the MW link) has to provide
the clock for the link.
Every piece of the link has to hava a master and slave side.

ex.

+-------+        +------+             +------+        +-------+
|  ATM  |-M----S-|  MW  |-M---------S-|  MW  |-M----S-|  ATM  |
+-------+        +------+             +------+        +-------+

The default configuration on Marconi switches makes them master on all
ports.
Since ATM is asynchronous this doesn't matter when switches are directly
connected.
It does matter however when other synchronous equipment is used to
connect 2 ATM ports.

You can make a port clocking slave as follows.

hardware port sonet modify <portnr> -timing network

Check the clocking requirement of the radio equipment for selecting
master an slave configuration. ( The radio equipment is unknown to me)

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 can't find info abour SRTS on the ATMF approved specs or spec watch page.
> 
> TIA
> 
> --
> 
> Andrew Gallo                                                    202-994-9026
> IS Engineer
> The George Washington University
> *******************************************
> PGP Key available at http://gwu.edu/~agallo
> *******************************************
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