Re: draft-mannie-ccamp-gmpls-lbm-tdm-00.txt

[Maarten Vissers <mvissers@lucent.com>]

Eric, Dimitri,

You write in your document 

  " For instance, a received SDH STM-64 frame can contain a VC-4-4c, 
   while a next frame can contain a VC-4-16c starting at the same 
   place as the VC-4-4c and thus occupying the same first VC-4 
   spaces. This process is not service impacting or disruptive. "

I am intriged by this statement, and hope you are able to explain how this would
be realised in a real SDH/SONET equipment and network. 

To me this looks very service impacting and disruptive.
E.g. according to G.783, 75% of the VC-4-16c received will not be passed through
while a series of AU3dLOP, AU4dLOP and/or AU4-4cdLOP will be detected and AIS is
inserted.

Only if you have a modified AU pointer processor which is adaptive to the
incoming signal structure you will not get any defects detected and AIS
inserted; i.e. you can do this only if you have set up an AUG-N/STSG-N
connection. In this AUG-N case you haven't specified the specific substructure,
and don't need to do this. This is controlled by the user equipment, which will
not be able to use the connection while e.g. circuit packs in the equipment are
changed, or switches are made and pointer processors are reprovisioned.

Regards,

Maarten
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