Re: ONLY one ref multiplier?: PMA clock reference
Justin,
I would be interested in such a discussion.
At 10:25 PM 6/26/00 -0400, Jscquake@aol.com wrote:
>Henning, Stuart B, Stuart R, Joel, all,
>
>Thanks for your varied responses. In light of this interesting discussion
>which will probably not end here, is there any interest to have an informal
>discussion among interested parties sometime (evening?) in La Jolla?
>I would venture to go along the lines w/ what Henning wrote ... perhaps we
>can focus on what things need/can be specified for 10GE from OIF. I would
>also be curious if a 4-bit interface (SUPI) has any interest left among the
>group. I can see how a 4-bit has advantages (power savings) but leaving it
>out would still allow others to implement it.
>Suggest Wed night. Any interest?
>
>Sincerely,
>Justin
>
>In a message dated 6/26/00 9:26:52 AM Pacific Daylight Time, dhuff@mltc.com
>writes:
>
> >
> > Just as a counter point, we probably address a different market segment,
>but
> > all (but one) of our customers have chosen a 622 reference clock, instead
>of
> > the 155 option...
> >
> > David Huff
> > Executive Director, Marketing
> > Multilink Technology Corporation
> > 300 Atrium Drive, Second Floor
> > Somerset, NJ 08873
> > ph: 732.537.3731
> > fx: 732.805.9177
> > www.mltc.com
> >
> >
> > > -----Original Message-----
> > > From: owner-stds-802-3-hssg@ieee.org
> > > [mailto:owner-stds-802-3-hssg@ieee.org]On Behalf Of Lysdal, Henning
> > > Sent: Monday, June 26, 2000 3:59 AM
> > > To: stds-802-3-hssg@ieee.org
> > > Subject: RE: ONLY one ref multiplier?: PMA clock reference
> > >
> > >
> > >
> > >
> > > Stuart, Justin, all
> > >
> > > I appologize if my answer to the fairly simple question by Justin:
> > > "Are there any that uses the 155MHz as a reference for OC192?"
> > > has confused some.
> > >
> > > My point was to show technical feasibility, so I'll give it a second
> try,
> > > and see if we can get the discussion back on track:
> > >
> > > Given the choice between a 155.52MHz reference clock and a 622.08 MHz
> > > reference clock most of the transceiver vendors (SerDes
> > > customers), I know,
> > > CHOOSE 155.52MHz.
> > >
> > > It might be easier to get good jitter performance with 622.08MHz
> > > (644.53MHz), but it is also more expensive.
> > >
> > > Maybe we should start discussing which parts of the OIF spec. should be
> > > copied for Ethernet rather than going over the details of which
> > > frequencies
> > > goes where. I guess we can all agree, we need RXDATA, RX_CLK,
> TX_DATA and
> > > TX_CLK. What else do we need to specify?
> > >
> > > Regards,
> > >
> > > Henning
Fred Weniger
Gigabit Product Marketing Manager
805-388-7571
fax: 805-384-5065
weniger@vitesse.com
VITESSE
SEMICONDUCTOR CORPORATION