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Cell Relay Retreat>List Archive>month:1998-Apr> msg00233



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Re: SONET and SDH

  • From: "Jaan Leemet" <Jaan.Leemet.jleemet@nt.com>
  • Date: Thu, 23 Apr 1998 14:47:52 -0400

The only real difference in the overhead for STM1 and STS3c is one of the
SSbits in the H1 byte.  These are set to 10 in STM1 and 00 on STS3c.  most
equipment ignores these bytes anyways so you should not have any
interoperability problems however some (mostly older) equipment may give you
a 'loss of pointer' alarm.  Should not affect your traffic however. 
						
	
Jaan,

> > >
> > > I don't know if that question was brought to the list yet,
> > > but I'd like to know if there may be problems when I
> > > connect ATM equipment which uses SDH STM-1 framing
> > > to ATM equipment using SONET STS-3c?
> >
> > In the SONET/SDH header there are some minor differences. These
> differences
> > are big enough to give you interoperability problems.
>