Re: WWDM vs. 10Gb/s serial
- To: bill.st.arnaud@xxxxxxxxxx
- Subject: Re: WWDM vs. 10Gb/s serial
- From: Rich Taborek <rtaborek@xxxxxxxxxxxxxxxx>
- Date: Mon, 10 May 1999 12:40:49 -0700
- CC: HSSG_reflector <stds-802-3-hssg@xxxxxxxx>
- Organization: Transcendata, Inc.
- References: <NBBBJIMEPHPGCNGAHPMFMELIEKAA.bill.st.arnaud@xxxxxxxxxx>
- Reply-To: rtaborek@xxxxxxxxxxxxxxxx
- Sender: owner-stds-802-3-hssg@xxxxxxxxxxxxxxxxxx
Bill,
The 1000BASE-X PHY already requires most of the facilities necessary to
meet your requirements. Many implementations have the facilities to meet
ALL of your requirements.
- Laser failure notification is not required by 1000BASE-X. However,
many implementations support this indication. Internally, a laser
failure will likely result in an assertion of the Link Failure condition
which may be reflected in the (optional) management Status register. A
laser failure indication, if implemented, is generally signalled much
faster than 10 msec.
- Loss of Signal/RX_Los is required by 1000BASE-X. LOS results in an
assertion of the Link Failure condition which may be reflected in the
(optional) management Status register.
- One of the side benefits of using a robust block code like 8B/10B is
the error detection capability of the code. 8B/10B provides error
detection via invalid code and running disparity error detection. The
8B/10B error rate corresponds quite nicely to the link BER and may be
used to provide dynamic link BER monitoring.
--
Bill St. Arnaud wrote:
>
> I think most restoral and protection schemes will move to higher protocol
> layers. I don't think the 10xGbE at the PHY layer should be concerned about
> fast restoral. However we do need very fast notification of laser failure
> on the Tx PHY (< 10 msec) and similarly it would be nice in an ideal world
> to have some tools to monitor loss of received laser power (DC bias?) on Rx
> PHY . BER would also be useful, but maybe this should be done at a higher
> level protocol
>
> Bill
>
> -------------------------------------------
> Bill St Arnaud
> Director Network Projects
> CANARIE
> bill.st.arnaud@xxxxxxxxxx
> http://tweetie.canarie.ca/~bstarn
--
Best Regards,
Rich
-------------------------------------------------------------
Richard Taborek Sr. Tel: 650 210 8800 x101 or 408 370 9233
Principal Architect Fax: 650 940 1898 or 408 374 3645
Transcendata, Inc. Email: rtaborek@xxxxxxxxxxxxxxxx
1029 Corporation Way http://www.transcendata.com
Palo Alto, CA 94303-4305 Alt email: rtaborek@xxxxxxxxxxxxx