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Re: [HSSG] fault signalling

I would certainly support something like this. This would be very useful
when connecting the client interface on a DWDM transponder to a 100GE
interface on a router/switch/ADM. It might be as simple as defining
another 'ordered code set' for fault signaling, so we would now have a
total of three codes:


The lack of such a feature at 10GE is one of the (very few) reasons that
OC192 interfaces continue to be used for this kind of interconnect.

Gary Nicholl


> -----Original Message-----
> From: Mikael Abrahamsson [mailto:swmike@SWM.PP.SE] 
> Sent: Monday, September 17, 2007 4:44 PM
> Subject: [HSSG] fault signalling
> Hello.
> I am very interested in having new HSSG standard implement 
> some kind of signalling equivalent to AIS, RDI etc which is 
> present in SONET/SDH and which is very useful for 
> fault-finding i WAN/DWDM applications where regenerators or 
> transponders are used to indicate where the fault might be.
> Is it too early in the process to start discussing this? 
> Since symbol and bit encoding is being discussed. I am under 
> the impression that one could use non-data symbols out of 
> 64b/66b to handle some of the signalling, thus I wanted to 
> ask this early on in case this is the proper time, or if it 
> should be done later.
> I have quite a few ideas about what could be included, even 
> if it's said to be optional to include (I don't know how this 
> is usually done).
> I am willing to try to put together a more structured list of 
> suggestions if it's deemed appropriate at this time.
> -- 
> Mikael Abrahamsson    email: