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RFC 4842, "Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) Circuit Emulation over Packet (CEP)", April 2007

Source of RFC: pwe3 (int)
See Also: RFC 4842w/ inline errata

Errata ID: 1064
Status: Verified
Type: Technical
Publication Format(s) : TEXT

Reported By: Alfred Hoenes
Date Reported: 2007-05-17

Section 11.2.1.1 says:

   The 28 bits of the EBM are divided into groups of 4 bits, each
   corresponding to a different VTG within the STS container.  All 4 
   bits are used to indicate whether VT1.5 (T1) tributaries are carried
   within a VTG.  The first 3 bits read from right to left are used to
   indicate whether VT2 (E1) tributaries are carried within a VTG.  The
   first 2 bits are used to indicate whether VT3 (DS1C) tributaries are    
   carried within a VTG.

It should say:

   The 28 bits of the EBM are divided into groups of 4 bits, each
   corresponding to a different VTG within the STS container.  All 4
   bits are used to indicate whether VT1.5 (T1) tributaries are carried
   within a VTG.  The 3 rightmost bits in a bit group are used to    
   indicate whether VT2 (E1) tributaries are carried within a VTG.
   The 2 rightmost bits in a bit group are used to indicate whether  
   VT3 (DS1C) tributaries are carried within a VTG.

Notes:

Replaced 'first 3 bits read from right to left' with '3 rightmost
bits' and similarly 'first 2 bits' with '2 rightmost bits'. The
new text avoids possible confusion with regards to the position
of the relevant bits.

from pending

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