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RFC 4606, "Generalized Multi-Protocol Label Switching (GMPLS) Extensions for Synchronous Optical Network (SONET) and Synchronous Digital Hierarchy (SDH) Control", August 2006

Source of RFC: ccamp (rtg)

Errata ID: 43
Status: Rejected
Type: Technical
Publication Format(s) : TEXT

Reported By: Alfred Hoenes
Date Reported: 2006-11-01
Rejected by: Adrian Farrel
Date Rejected: 2011-05-08

 

(1)  use of "N"

In Section 2.1 of RFC 4606, on page 6, the explanations for
the NCC field contain the Note:

   Note 2: When a transparent STS-N/STM-N signal is requested that is
   limited to a single contiguously concatenated STS-Nc_SPE/VC-4-Nc, the
   signal type must be STS-N/STM-N, RCC with flag 1, NCC set to 1.

Such text (and similar) contains an unfortunate mess-up of two
distinct uses of "N", with different range of admissible values
for STS-N and STM-N.
This becomes particularly confusing in phrases like
"a single contiguously concatenated STS-Nc_SPE/VC-4-Nc".
I strongly recommend to avoid this overloaded use of "N"
in a single context.
Using "M" for one of these two "N"s instead, i.e. talking
about "STS-M/STM-N", or talking about "STS-<3*N>/STM-N" or
even "STS-3N/STM-N", would remove the ambiguity and add to
the clarity of the text.


(3)  continuation of (1)

Within section 3, the numbered rules on mid-page 13 would also
benefit from application of the arguments given in item (1) above:

   1.  S=1->N is the index of a particular STS-3/AUG-1 inside an
       STS-N/STM-N multiplex.  S is only significant for SONET STS-N
       (N>1) and SDH STM-N (N>0).  S must be 0 and ignored for STS-1 and
       STM-0.

should better be specified as:

   1.  S=1->N is the index of a particular STS-3/AUG-1 inside an
|      STS-3N/STM-N multiplex.
|      S is only significant for SONET STS-3N and SDH STM-N (N>0).
       S must be 0 and ignored for STS-1 and STM-0.

and

   2.  U=1->3 is the index of a particular STS-1_SPE/VC-3 within an
       STS-3/AUG-1.  U is only significant for SONET STS-N (N>1) and SDH
       STM-N (N>0).  U must be 0 and ignored for STS-1 and STM-0.

should better be specified as:

   2.  U=1->3 is the index of a particular STS-1_SPE/VC-3 within an
       STS-3/AUG-1.
|      U is only significant for SONET STS-3N and SDH STM-N (N>0).
       U must be 0 and ignored for STS-1 and STM-0.

Notes:

Erratum 43 has been duplicated to allow separate treatment of the different elements reported. This copy is used to address the rejected parts. The rest of the Erratum is now 2804.
--VERIFIER NOTES--
Points 1) and 3) are rejected. Although the repeated use of "N" could lead a reader to be confused, this is common usage amongst writers on TDM, and the readership within CCAMP has so far been unconfused.

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