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Re: Link Status thoughts and other status signals


Rate Select could be used to select specific circuitry to allow both LAN
and WAN line rate operation at a PMD. For example, the WAN PMD line rate
is 10.000 Gbps the WAN PMD line rate is 9.952 Gbps. It may be necessary
to switch in different oscillators, receive filters, etc. to enable a
combinational physical embodiment of a LAN/WAN PMD.

Architecturally for P802.3ae, rate select could be a bit in 10G PMA/PMD
capability register 1.4 as described in Clause 33. 

Best Regards,

Roy Bynum wrote:
> Schelto,
> For those of us that are unfamiliar with Fibre Channel optics, could you
> explain what the "Rate Select" function is?
> Thank you,
> Roy Bynum
> At 04:42 PM 10/28/00 -0700, schelto.vandoorn@xxxxxxxxxxxx wrote:
> >In the same sense as Rich did, I would like to throw in my 10 cents.
> >
> >Just as the link status needs to be defined, I see also the need to define
> >two additional signals in the other direction.  Namely transmit disable
> >and rate select.
> >
> >Rate Select
> >This is also a new single on transceivers and in 10 GbE will be
> >optional.  But I can see for some implementations that this signal could
> >be useful to switch between different receive filters for different data
> >rates, or different PMD's,  if they are implemented.
> >
> >I strongly believe that we should also define these signals.
> >
> >Have fun
> >Schelto
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