10G-BASE-T question

[Jaime Kardontchik <kardontchik.jaime@xxxxxxxxxxx>]

Rogers,

The figure on page 4 emphasizes more the maximum clock used in the
10G-BASE-T architecture, 1.25 GHz, and the maximum baud rate
in the optical fiber, 1.25 Gbaud/sec.

The actual width of the MII interface is a question open to discussion.

Shimon Muller (Sun) suggested using a 32-bit wide interface (64-bit
wide if we include both the Tx and Rx). Dan Dove (HP), in the audience,
suggested that if we use a 32-bit wide interface we might end up with
a chip that is all I/Os surrounding a tiny design, and he suggested to
take here an agressive approach and stick to an 8-bit wide interface.

I tend to agree with Dan for the same reason and for another one:
32 TTL-type output drivers at the Rx would introduce a lot of
switching noise that could affect the analog blocks in the chip,
including the jitter of the transmitter.

Jaime

Jaime E. Kardontchik
Micro Linear
San Jose, CA 95131
email: kardontchik.jaime@xxxxxxxxxxx

"Rogers, Shawn" wrote:

> Jaime, I have a question concerning your presentation in Idaho.  On page 4
> of your presentation you state the following when comparing your 10G-Base-T
> proposal to 802.3ab (1000Base-T):
>
>    1000Base-T           10G-Base-T
>     GMII-8bit wide      10GMII - same
>
> Are you advocating a byte wide chip-to-chip interface between the PCS and
> Reconciliation sublayer in the MAC running at 1.25Ghz?
>
> Regards,
> Shawn
>
> -----Original Message-----
> From: Jaime Kardontchik [mailto:kardontchik.jaime@xxxxxxxxxxx]
> Sent: Monday, June 07, 1999 5:57 PM
> To: stds-802-3-hssg@xxxxxxxx
> Subject: 10G-BASE-T presentation
>
> Hello 10G'ers,
>
> For those that were not able to attend the Idaho meeting:
>
> The presentation on the 10G-BASE-T architecture given
> in Idaho included more material than the original posted
> two weeks ago.
>
> The updated presentation as given in Idaho is now in the
> web site,  replacing the old one:
>
> http://grouper.ieee.org/groups/802/3/10G_study/public/june99
>
> Jaime
>
> Jaime E. Kardontchik
> Micro Linear
> San Jose, CA 95131
> email: kardontchik.jaime@xxxxxxxxxxx