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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 yet.)
>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.  I'm assuming
>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 decoded into
>byte wide (XGMII like) data.
>Is that what your concern is?
>PS: how's the leg feeling?
>		-----Original Message-----
>		From:	Paul Bottorff [mailto:pbottorf@xxxxxxxxxxxxxxxxxx]
>		Sent:	Friday, April 07, 2000 11:07 AM
>		To:	Rick Walker; Paul Bottorff
>		Cc:	HSSG
>		Subject:	Re: Interface reality check
>		Rick:
>		To support T1X1 other types of frames aside from Ethernet
>format are
>		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.
>		Cheers,
>		Paul
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
email: pbottorf@xxxxxxxxxxxxxxxxxx