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RE: Final draft of response to the OIF

Dimitri,
 
The control plane is intended to control the data plane, not the naming of data plane signals in various standards.  The fact that two names are used in SONET and SDH for the same data plane signal is not justification for creating two encodings in the control plane.
 
This should be a simple thing to fix, if we (CCAMP) are willing to fix it.
 
Regards,
Ben

From: owner-ccamp@ops.ietf.org [mailto:owner-ccamp@ops.ietf.org] On Behalf Of Dimitri.Papadimitriou@alcatel.be
Sent: Thursday, September 01, 2005 6:53 AM
To: Huub van Helvoort
Cc: Dimitri.Papadimitriou@alcatel.be; bertk@txc.com; dpapadimitriou@psg.com; Adrian Farrel; ccamp@ops.ietf.org
Subject: Re: Final draft of response to the OIF

huub,

> > > Standard contiguous concatenated STS-Nc SPE is actually STS-3c-Xc SPE
> > > with N=3X and X=4,16,64,... which explains the coding with a STS-3c SPE
> > > elementary signal and NCC=X. So we code the STS-Nc SPE and VC-4-Xc
> > > identical (examples 3 and 9) but not their base signal ?!?...
> >
> > i refer you to section 7.3.1 of ANSI T1.105 - 2001 (aka SONET base spec)
> > you will that your interpretation is not the one specified in this
> > recommendation
> >
> > " Super rates services are mapped into and transported as STS-Nc SPE
> > [N=3X there X = 1, 4, 16, 64 or 256]"
>
> Somehow you left out the last part between the square brackets:
> "or SDH VC-4 or VC-4-Xc, where X=N/3]"
>
> This clearly means that an STS-3c == VC-4 == super rate of STS-1.

indeed but we are not discussing this issue or put this "equivalence" under questioning (in fact this is reproduced in the signal type 6 definition) the RFC took as logic (control plane) to set the RCC value when the notation of the signal included a "c" we could have created yet another exception but we did not - for several reasons -


> > this is exactly what we used in RFC 3946


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