Cell Relay Archive

["Jerric Davis" <pheadrus1@hotmail.com>]

Jeff,
My company actually uses an  OC-12/OC-48 SONET backbone for our interswitch
trunking.  All of our core switches are timed off of a stratum-1 GPS clock,
all edge switches reference the core for timing.  So answer your question,
Yes.  This design has provided a reliable and acurate timing source for our
network.  I suppose the most stringent test for ATM would be AAL1 circuit
emulation, this usually will show even the smallest slip in network timing,
and has performed well on our network.

<kroese@my-deja.com> wrote in message 85519h$rc0$1@nnrp1.deja.com">news:85519h$rc0$1@nnrp1.deja.com...
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> The synchronization of long-haul digital networks is typically
> accomplished using an external synchronization source, such as GPS, and
> a hierarchical timing distribution system.  Core switching sites are
> timed to a Stratum 1 PRS, and are synched to lower level switching sites
> and other nodes where there may be a Stratum 2 or 3 clocks.  The Stratum
> 1 clocks have a frequency stability of 10 to the minus 11 or better.
>
> Questions:  As SONET speeds of OC-12 and beyond become more common, are
> these timing distribution schemes still going to be sufficient,
> particularly for ATM over SONET backbones?  Does anyone know of timing
> requirements for ATM over SONET which are going to force changes in
> current network implementations?
>
> Jeff Kroese
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> Sent via Deja.com http://www.deja.com/
> Before you buy.