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Re: [802.3ae] Clarification of the 10GBASE-W ELTE function


There is a single point of failure that prevents a WIS as defined by IEEE 
from ever being an interface on SONET ADM.  The client interface on a SONET 
ADM requires clock synchronization either through "loop timing" or 
"PRS".  Neither of these are available in the WIS.  This lack of 
synchronization to a transmission network prevents the ADM from being able 
to multiplex the WIS signal into a SONET signal.
As defined, the WIS can never be a client of a SONET or SDH system.  It can 
be a "peer" on an optical network only.  The T1X1.5 proposal provides for a 
"peering" between a WIS and a SONET managed optical network.  It does not 
provide for the WIS to be an interface on a SONET system.

Thank you,
Roy Bynum
Orbital View LLC

At 10:27 AM 1/16/2002 -0800, C. M. Heard wrote:

>FYI: the following contribution to T1X1.5 (written by Tom
>Alexander, David Martin, and Steve Gorshe) may be of interest,
>as it presents a detailed argument that ELTE can be
>realized within existing NEs -- e.g. as a 10GBASE-W line
>card -- and does not require a separate external piece of
>equipment.  That was exactly the message of the last slide
>in the WIS MIB design team's IETF52 presentation (see
>illustrating a 10GBASE-W interface on a SONET ADM.
>Mike Heard
>CONTRIBUTION#: T1X1.5/2002-027 (2X150270)
>TITLE: Clarification of the 10GBASE-W Ethernet Line Terminating
>Equipment (ELTE) function and its realization within existing SONET
>DESC: This contribution clarifies the issues that have been raised with
>regards to the proposed ELTE function, needed to adapt a 10GBASE-W
>Ethernet WAN-PHY signal to a SONET/SDH STS-192c/VC-4-64c signal. In
>particular, we demonstrate that such adaptation does not need
>additional NEs; that is, the ELTE function can be realized by existing
>NEs, and does not require new equipment to be added to a SONET/SDH
>CONTACT(S): Steve Gorshe (Steve_Gorshe@xxxxxxxxxxxxxx (503) 431-7440)
>SOURCE: Nortel Networks, PMC-Sierra