RE: Final draft of response to the OIF

["Mack-Crane, T. Benjamin" <Ben.Mack-Crane@tellabs.com>]

Hi Huub,

See in-line below.

Regards,
Ben

> -----Original Message-----
> From: Huub van Helvoort [mailto:hhelvoort@chello.nl] 
> Sent: Friday, August 26, 2005 10:56 AM
> To: Mack-Crane, T. Benjamin
> Cc: Adrian Farrel; ccamp@ops.ietf.org
> Subject: Re: Final draft of response to the OIF
> 
> Hello Ben,
> 
> You wrote:
> 
> > I proposed a simple (and I think technically sound) solution to
> > item #1 and saw no objections, however the answer has not changed.
> > 
> > I do not understand the reason for different encodings for
> > VC-4 and STS-3c SPE.  I think they should be the same, unless
> > there is a technical need to distinguish them.
> 
> If there is agreement that they should be the same, we should
> also look at higher order contiguous concatenated signals:
> i.e. STS-12c == VC-4-4c, STS-48c == VC-4-16c, STS-192c == VC-4-64c
> STS-768c == VC-4-256c

These signals are already encoded the same way (for instance see
examples 3 and 9 in RFC 3946).

> 
> > I also do not understand the RCC=1 NCC=1 encoding, since the rule
> > contained in the current RFC actually makes more sense. 
> 
> However indicating the number of signals concatenated in NCC
> makes your first objective impossible: STS-3Xc == VC-4-Xc
> so there will always be a difference of a factor 3 between
> STS and VC-4 encoding

All the encodings of contiguous concatenated signals use VC-4
(STS-3c SPE) as the base, so the NCC values are the same.  This
was done to align SONET and SDH encodings.

> 
> > If there is
> > only
> > one signal element, there is no contiguous concatenation, 
> by definition.
> 
> In fact a single signal is always contiguous concatenated  ;-)
> 
> > So I fail to see the usefulness of these encodings.
> 
> NCC = 1 would normally not occur, so it could be used for
> this specific case of SONET signals transported in an
> SDH world, or SDH signals transported in SONET land.
> And if these signals would not cross borders the value
> NCC > 1 can be used.

The SDH and SONET encodings have been aligned in all cases
except this one (VC-4, STS-3c SPE).  So these should also
be aligned.

> 
> > Regards,
> > Ben
> 
> Cheers, Huub.
> 
> -- 
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