Re: [802.3_NGAUTO] potential objectives change

[NATALIE WIENCKOWSKI <NWIENCKOWSKI@xxxxxxx>]

All,

As we discuss auto-negotiation and multiple speeds, is it necessary for all of the speeds to use twisted pair to do this?  If coax or twinax is chosen for 10 Gbps is it possible for this phy to operate at and communicate with PHYs at lower speeds that use a form of twisted pair?  If auto-negotiation is truly needed by some parties between these speeds we need to ensure that we don't select a cable type that makes this impossible.

It would be  helpful if PHY vendors could provide contributions on whether this is possible and if end users could provide information on their needs for auto-negotiation.

Thanks,

Natalie Wienckowski

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From: Geoff Thompson <thompson@xxxxxxxx>
Sent: Wednesday, February 1, 2017 6:10 PM
To: STDS-802-3-NGAUTO@xxxxxxxxxxxxxxxxx
Subject: Re: [802.3_NGAUTO] potential objectives change

 

Colleagues

What I would like  to see is some technical presentations on the impact
of HIGHLY ASSYMETRICAL data rates on:
        - Relative implementation complexity (e.g. gate count, die size)
        - Operational power dissipation
and (therefore presumably)lower relative cost.

It seems from the discussions that in this particular case,
we have high enough prospective volume and
enough cost sensitivity
and enough sensitivity to power dissipation
that this case is unusual enough in our history to be worth extra attention.

In particular, the back channel requirements seem low enough that they
could be satisfied by what exists in other standards as an auxiliary
or management channel.

Geoff Thompson