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I have a Polycom Viewstation FX that has a warning
label on the blue interface socket: "Connect only to
viewstation IMUX. Failure to do so will result in
system damage".

In fact this blue socket provide a strange RJ45 with a key
index pin. What does it means ? Can I plug there a
normal quad BRI interface, with a green RJ45 socket,
allowing the set to work with ISDN ?

Is this a special Viewstation FX version that works
with IP only ? How can I identify the type or version ?

Thanks for your help

I have discovered that IMUX means Quad BRI unit.
It seems that I need a particular RJ45 cable, a light blue
indexed from one side and green (non indexed) from
the other.

Unfortunally I have not. Anyone knows what is the
difference with a normal 8 pin RJ45 cable ?
Is it twisted ? Where can I found layout connection ?

Thank you

It is probably standard wiring, can check a cable if U need, but it only
works with Polycom interface box (several models).