> The use of a "hybrid" as used in telephony applications to convert 2 
> wire to 4 wire and back can give you additional signal paths at no 
> extra cost in interconnections.

We were talking about timeless/timeindependent protocols. I think
telephone-style forks in practice always have so time (=frequency)
dependence, so they would not be suitable. 

Wouter van Ooijen

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