On 17/03/2017 09:50, Capitol wrote:
Dave Liquorice wrote:
On Thu, 16 Mar 2017 23:33:48 +0000, John Rumm wrote:

You can get RJ45 (8p8c) connectors with the release tab off to one
side...

Lego Mindstorms NXT uses 6p6c:

http://www.active-robots.com/connect...or-nxt-10-pack

Sockets and crimper might be harder to come across...

Not quite sure what the OP means by "network" are both ethernet/IP
data networks or is the AV one something else. With data networks two
or more sub-nets on the same physical infrastructure isn't a problem,
just make sure the netmasks and IP ranges don't overlap. Maybe use
192.168.n.n for one and the other somewhere in 172.16.n.n to
172.31.n.n (or even 10.n.n.n). Of course some one could alter
settings in their device...

Alternatively ethernet up to 100 Mbps only uses two pairs so 6p6c,
6p4c, 4p4c are feaseable. 4p are used for telephony, lines to
phone/modemd, handsets to phone. 6p is less common I think.


The A/V is analogue, with 12V power line.


So as long as you connect the 12V to different pairs on the ethernet
then nothing bad will happen if you plug a PC in.
The signal pairs on ethernet are isolated by pulse transformers with a
minimum 1500V isolation. You just don't want to apply 12V to either side
of one of the transformers so putting it down different pairs will be
fine. Power over ethernet does just that so you could stick to the same
pinout for the power.