[Arm-netbook] EOMA server standard

[Baybal Ni]

Why not connect modules without any transceivers? My idea was that
modules sharing the same backplane would connect to switch chip
without any phy's, and only one output leading out of U2 will have a
phy for UTP or SFP+ socket.

On 25 October 2012 14:16, luke.leighton <luke.leighton at gmail.com> wrote:
> On Thu, Oct 25, 2012 at 10:03 PM, peter green <plugwash at p10link.net> wrote:
>
>> [lots of useful technical stuff snipped]
>
>> Personally I think it may be too early to design a backplane standard
>> for arm servers and we may need to wait and see whether the bulk of the
>> market follows the marvell approach or the calexeda one. If you had to
>> choose one i'd probablly be inclined to go with the marvell one as at
>> least it can fairly easilly support non server-specific SoCs.
>>> for the pin-outs i figured that at least one 10GBase-T interface (8
>>> pins plus 8 GND spacers) would be acceptable,
>> Using 10GBASE-T to communicate with backplanes is crazy since it's power
>> hungry as hell even using 1000BASE-T is still pretty crazy. Remember the
>> SoCs don't support BASE-T directly they need seperate transceiver chips.
>
>  yes.  that's where i was hoping to put the standard: somewhere which
> is pretty obviously just a matter of plugging servers into standard
> switches, basically.
>
> i.e. imagine that the backplane standard's prototype could be
> constructed from off-the-shelf switches, off-the-shelf cables and
> off-the-shelf hard drives, what hardware would you pick?  those are
> the lines along which i'm thinking, perhaps naively, i don't know.
>
> ah i've got an idea.  if the cards are stacked on top of each other,
> you could have a 2-height one have 2 connectors.  or a 3-height one
> have 3 connectors.  that way, if you wanted one particularly thick
> card to have 2 lots of ethernets, you'd make it cover 2 slots.
>
> achh :)
>
> l.
>
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