Cell Relay Archive

[William Brasuell <brasuell_bill@tandem.com>]

pmandal@ix.netcom.com wrote:
> 
> Richard,
> 
> Actually, I believe, most of the differences lie in the
> definition and the usage of the overhead (path, line, section)
> bytes.
> 
> It would be a "bug" if you were able to interoperate
> between SONET and SDH.
> 
> Praveen Mandal
> RedBack Networks
> praveen@rback.com
> 
> In article <01bd6d90$d7b89b80$3f03140a@engineering>#1/1,
>   "Richard Zheng" <richard.zheng@shaw.ca> wrote:
> >
> >
> > Markus Berg <berg@irt.de> wrote in article
> > <6eu51m$2es$1@debris.uits.indiana.edu>...
> > > Hi to all,
> > >
> > > 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.
> >
> > Richard Zheng
> >
> 
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In STM-1 (the SDH frame) in the H1 field bit 5=1 and bit 6=0. In STS
(the SONET frame) these bits are ignored.

Bill