Re: [BP] pre-agenda for Wednesday's meeting
Another option to consider in tightening TX jitter specifications could
be reducing the frequency of the 3dB pole from 6MHz to 1-2MHz. This
could allow a smaller bandwidth CDR with less self-jitter, and help
improve margins.
I am not sure if the additional transmit jitter being tracked with a
6MHz bandwidth CDR is greater than the increased self-jitter from the
wider bandwidth CDR itself.
6MHz for 10G is almost proportionately scaled from 1.875MHz for CX4 at
3.125G. CX4 has 8B/10B (guaranteed min. transition density) and an open
eye at the receiver. Both helped CDR run at a higher bandwidth with
small self-jitter. At 10G, with a receive eye that has smaller margin,
xtalk and with 64B/66B that can have potentially long runs without phase
information, a similar bandwidth CDR should be noisier.
Sorry to bring this up late. I think it should be something we should at
least consider.
Magesh
> -----Original Message-----
> From: Charles Moore [mailto:charles.moore@AVAGOTECH.COM]
> Sent: Monday, January 23, 2006 12:28 PM
> To: STDS-802-3-BLADE@listserv.ieee.org
> Subject: [BP] pre-agenda for Wednesday's meeting
>
> guys:
>
> The goals the channel model ad-hoc, as outlined in
> moore_03_0106, are to prepare a "proposal at February
> meeting. Proposal to include:
>
> (a)Reduced channel loss
> (b)Reduced crosstalk
> (c)Increased EIT baseline
> (d)Convert some of jitter in EIT test to DCD (e)Reduced Tx jitter"
>
> I would like to get agreement on as many of these items
> as possible and to limit discussion to things which will lead
> to agreement on these items. If you have relevant
> presentations, please get them posted ASAP.
>
> I plan to take on the issues in the order listed. If
> you want to discuss something from the lower part of the
> list, you would be advised to get something started on the
> reflector because we may not get to you in the meeting.
>
> After the meeting, acting as ad-hoc chair, i will
> prepare slides covering our results as a channel ad-hoc
> report. I will also, acting as me, prepare a proposal or
> proposals, covering (a-e) broadly construed. I will use the
> committee results, reflector discussions, of line
> discussions, and my own personal prejudice as guides on this.
>
> charles
>
> --
> |--------------------------------------------------------------------|
> | Charles Moore
> | Avago Technologies
> | Image Solutions Division
> | charles.moore@avagotech.com
> | (970) 288-4561
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>
>