RE: Interface reality check
What is the impact on the WAN PHY silicon? Is it area, cost, complexity?
From: Paul Bottorff [mailto:pbottorf@xxxxxxxxxxxxxxxxxx]
Sent: Friday, April 07, 2000 5:26 PM
To: Booth, Bradley; HSSG
Subject: RE: Interface reality check
The octet alignment issue has nothing to do with an ELTE
(except that an
ELTE must implement a portion of the WAN-PHY). This issue is
the impact on
silicon for the WAN-PHY.
At 02:41 PM 4/7/00 -0700, Booth, Bradley wrote:
>I'm trying to understand something here, so maybe you can
help me out with
>this. I know that the ELTE is outside of what the 802.3 TF
will be working
>on, but is it your concern that by putting non-octet
aligned data into the
>SPE that this will not work with the ELTE that is going to
be defined by
>T1X1 and ITU. (I'm assuming that it has not been defined
>In the March plenary, David showed a slide of yours that
had the WAN PMD/PMA
>components on one-side of an ELTE and the SONET framer and
E/O components on
>the other side, with a Layer 1 Path Relay in between them.
>that the issue that you have with 64/66 is that the ELTE
only goes as high
>as the PMA Service Interface, and not through the PCS to be
>byte wide (XGMII like) data.
>Is that what your concern is?
>PS: how's the leg feeling?
> -----Original Message-----
> From: Paul Bottorff
> Sent: Friday, April 07, 2000 11:07 AM
> To: Rick Walker; Paul Bottorff
> Cc: HSSG
> Subject: Re: Interface reality check
> To support T1X1 other types of frames aside
> required. Since the format must be
determined before the CRC
>can be located
> using any part of the existing Ethernet
frame to determine
>the format is
> not a technique which works.
Paul A. Bottorff, Director Switching Architecture
Enterprise Solutions Technology Center
Nortel Networks, Inc.
4401 Great America Parkway
Santa Clara, CA 95052-8185
Tel: 408 495 3365 Fax: 408 495 1299 ESN: 265 3365