Re: [802.3ae] Clarification of the 10GBASE-W ELTE function
Mike,
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:
>Colleagues,
>
>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
>http://norseth.org/ietf/hubmib/ietf52wisMibPresentation.PDF)
>illustrating a 10GBASE-W interface on a SONET ADM.
>
>Regards,
>
>Mike Heard
>
>CONTRIBUTION#: T1X1.5/2002-027 (2X150270)
>LINK: http://www.t1.org/FileMgr/GetOneFile.taf?FileName=2X150270&NW=Y
>TITLE: Clarification of the 10GBASE-W Ethernet Line Terminating
>Equipment (ELTE) function and its realization within existing SONET
>equipment
>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
>network.
>CONTACT(S): Steve Gorshe (Steve_Gorshe@xxxxxxxxxxxxxx (503) 431-7440)
>SOURCE: Nortel Networks, PMC-Sierra