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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