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RE: [802.3ae] M0 Line remote error indiation support for WIS

   I did look into the GR-253 Bellcore as well as ANSI standards for M0
support. I did not find any details for including M0 byte for 10G framer and
above with backward compatiability. It seems SONET and SDH standards are
incompatible because of different defination of additional bytes for 10G
frame format. But SDH added the backward compatibility for line remote error
indication(M0).The interworking should be configured by the management
system ( It can not detect automatically).


Pankaj Kumar
Optical Products Group 
Intel corporation 
201 Mission St. 5th Floor 
San Francisco, Ca, 94105 
(415)  536-2166 <>  


-----Original Message-----
From: Roy Bynum []
Sent: Wednesday, September 05, 2001 2:48 PM
To: Kumar, Pankaj
Cc: ''; '';
''; ''
Subject: Re: [802.3ae] M0 Line remote error indiation support for WIS


Does this mean that this is an additional function in which standard SONET 
and standard SDH are incompatible?

Thank you,
Roy Bynum

At 12:33 PM 9/5/01 -0700, Kumar, Pankaj wrote:

>Hello all,
>WAN interface sub-layer support only M1 byte for STS-N line remote error
>indication as described in the structure of section and line overhead
>generated by WIS in figure 50-8 of P802.3ae_D3_2.cb
>ITU-T G.707 Revision 2000 has added M0 Line-REI byte in addition to M1 for
>STM-64 (10G) frames and above ( 40G) . The M0 byte will be located right
>before the M1 byte. The M0 and M1 bytes convey the count of interleaved bit
>blocks that has been detected in the error by the BIP-1536 (in the range of
>[0, 1536]). M0 bit 1 is most significant bit and M1 bit 8 is least
>significant bit. If interworking with old equipment supporting the single
>byte REI in M1, the value conveyed is truncated at 255 and inserted in M1.
>For backward compatibility, ITU-T specifies that for 10G frames, new
>equipment (10/2000 onward) should be able to support both modes : one-byte
>L-REI (M1) with a truncated value, as well as 2-byte L-REI (M0M1) with
>non-truncated REI.
>Since 10 Gbit/s WIS is defined after October 2000 and WAN-PHY would
>interface to SONET/SDH infrastructure. So WIS should also support the M0
>with backward compatibility. The interworking should be configured by the
>management system.
>What you all think about the M0 support in WIS .
>Pankaj Kumar
>Optical Products Group
>Intel corporation
>201 Mission St. 5th Floor
>San Francisco, Ca, 94105
>(415)  536-2166
> <>