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RE: [802.3ae] Wan Interface Sublayer

I was wondering about the same issue. I believe the answers to your
questions are (Anyone: Please correct me if i'm wrong):

-The WIS cannot be routed transparently over the SONET infrastructure. In
order to do so, you need a network element that will take the WIS frames and
change it into the "real" SONET frame, with the SONET clock tolerance and
with the proper Path, Line and section overhead to be used by the SONET

-The SONET is not transparent to the WIS I/F: (I'm not so sure what you
meant) You cannot receive a SONET frame that was not initially decoded as a
WIS packet

-To my understanding, the advantage of the WIS is that it slightly
simplifies the structure of the network element that translates from
Ethernet to SONET. In order to route from 10GBASE-R to SONET, for instance
POS or EoS, you have to go to higher layers and do the framing in a
different way (PoS or EoS way). You also have to buffer data because of rate
differences. In WIS frames, there are still buffer to compensate for clock
tolerance differences, but they are smaller. You also do not need to do
again the framing process, since its already SONET.

I hope it helps and will be glad to learn more about it.

> -----Original Message-----
> From: Ayers, Mike [mailto:Mike_Ayers@xxxxxxx]
> Sent: Thursday, August 16, 2001 7:10 PM
> To: 'stds-802-3-hssg@xxxxxxxx'
> Subject: RE: [802.3ae] Wan Interface Sublayer
> > From: Roy Bynum [mailto:rabynum@xxxxxxxxxxxxxx] 
> > The 10GbE WAN PHY in internally rate controlled.  It uses a 
> > 64/66 block 
> > encoding to map into the WIS overhead.  The 10GbE WAN PHY is 
> > designed to be 
> > compatible with SONET and SDH.
> 	Could I then route WIS over an arbitrary SONET path?  Is WIS
> transparent to a SONET network?  Is SONET delivery 
> transparent to a WIS
> interface?
> 	Thanks,
> /|/|ike