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4 Handbook of Intercom Systems Engineering
Figure 1.4
Example of Interfacing a TW System to a Matrix System
To connect a matrix intercom system to a Two-way radio system, a contact closure may be
required to activate the radio transmitter. A GPI (General Purpose Interface) between the
matrix and the base station of the radio can solve this problem easily.
To do intelligent trunking between matrix systems, across campus or across the country,
the audio and control signals between the matrices could be transported over fixed pairs of
wires. Realistically, however, installing a set of wires between Omaha and Los Angeles
may be out of your budget – so an interface allowing the use of dial-up telephone lines
may be needed. Other possibilities include muxes and demuxes to allow the audio and data
to be carried over an existing corporate Wide Area Network (WAN), or “piggybacked” as
subcarriers on an existing satellite feed.