| Natalie-
For whatever it is worth, the traditional 802.3 BASE-T Auto-Negotiation does not do anything in the way of cable testing. If you put 1000BASE-T transceivers at each end of a Category 3 link it will AutoNegotiate to 1000BASE-T successfully but will not operate (solely because of the insufficient cabling).
Geoff
All, my opinion is that „Auto-Neg“ always should cover on type of channel. So all 1-pair solutions should autoneg (100M/1G/2.5G ?) If e.g. the 10G solution uses a different media (2-pairs, coax, or any other choice different to 1-pair) autoneg to another media (1-pair) does not make sense. So the autoneg requirement should somehow reflect that if different media is choosen, autoneg is not needed. Regards, Stefan Stefan Buntz Mercedes-Benz Cars Development, Daimler AG Group Research & Advanced Engineering Safeguarding Hard & Software HPC: U059 – Dep.: RD/FEQ Phone: +49 731 505-2089 Mobil: +49 176 30 90 51 44 Fax: +49 711 305 216 45 95 Address for visitors: Buildung 10 Room 3.2.022 Wilhelm-Runge-Str. 11 D-89081 Ulm Germany 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 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
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