Keelan Lightfoot wrote:

> Also, I don't know how a 3 way call could be created with the MH88612:
> With the MH88500, just tie the junctors together.

  Is that actually documented so?  I can't see how they do it.  In fact,
I still haven't figured (without recourse to the documentation which I
trust *is* readily available on the site) whether this system is analog
or digital.

  If analog, then duplexing must be on the basis of a characteristic
impedance and grounding would be *critical* to the system.  Tying three
lines together would create an impedance mismatch which would increase
side-tone to each station as it speaks.

  If digital, then it uses either time-division multiplexing (CSMA/CD)
which would be adaptable to multiple stations, or ternary multiplexing
which would have exactly the same problem tying multiple lines as an
analog system, but would be far more noise-tolerant.

  If you know the answers to the above, *then* you might be in a
position to figure the two-wire version relatively easily.
--
  Cheers,
        Paul B.