2013/11/19 joem <joem@martindale-electric.co.uk>

> The HDMI 1.4 standard includes a few pins for Ethernet, max 100Mbps.
> One could make a breakout cable. Splitting the Ethernet and HDMI
> outside the tablet and no need to "invent" an extra connector nor
> adding it to the eoma-68 carries or card-fronts
>
>
> Too bad those are not on the market yet.

Too bad.

Where I see a problem is trying to make HDMI and ethernet work
at the same time. If someone connect an ethernet with HDMI cable
to HDMI, then you would expect the HDMI to survive
a miswire and/or a fault as a result of going through some ducting.
So invariably you are going to end up with an overspec'd HDMI that
handles ethernet which is likely an all round expensive standard to
follow.

I Think were on different tracks. The HDMI 1.4 standard consist of a HDMI connector with 19 pins. 2 of those are reserved voor Etherne. It was invented to have a TV provide Ethernet to its connected perhipials. So one RJ45 in the TV and the PVR, STB, etc recieve Ethernet from the TV.

So adding Ethernet to the HDMI is within specification. No alteration to the connector or cables required.

My thought was to create an Y-cable. A Male HMDI to Ethernet RJ45 female and HDMI female. The only strange thing is that only a single pair is used in HDMI and 10 and 100BaseTX uses 2 pairs (4 wires)?

And if you only connect a HDMI cable noting happens. And if your TV/Monitor provides Ethernet over HDMI. you have only one cable needed and no switch.

http://en.wikipedia.org/wiki/HDMI

Mis wiring will botch up anything. Not doing it because someone may miswire something is like forbidding riding bikes. You might hurt yourself. ;-)


So I'm thinking kick out the HDMI from the mini-HDMI connector
and just use 4 pairs for ethernet. May be some manufacturer could
be persuaded to put in a key that prevents normal mini-HDMI connectors
connecting to it.

I was thinking put some mini screw holes on each side like RS232
connectors to hold the connectors in place once connected and screwed
down. The connector geometry could then be altered to prevent standard
HDMI connecting to it because the connector is different to HDMI anyway
and requires modified tooling. That would be good for server rooms, but
cheap consumer items would probably not use screw down connectors.

There is an automotive HDMI connector available. And adapters are available. Probably cheaper and easier accepted than an off-spec hdmi
 


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