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42004-472B
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ANUAL
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f:\standard ioms - current release\42004 instr. manuals\42004-472b.doc
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When used with TMA, each telephone will typically be polled on a scheduled basis to determine its health
and will report the following:
Stuck push button
Microphone failure
Speaker failure
Microprocessor health (handshake)
Line interrupt (line current loss)
A dedicated telephone line is required per auto-dial telephone when the typical “polling” operation is
used. Although not recommended, auto-dial telephones can share a telephone line with the understanding
that if two or more telephones are put into use simultaneously, the line current could drop sufficiently to
disconnect the telephone call completely. This will depend on the line current, the length of the cable run,
and the condition of the telephone cable. When sharing a telephone line using TMA, the telephone must
be scheduled to “call in” instead of being polled by TMA.
The basic TMA package, Model 12509-042, includes a single line transceiver for polling a single
telephone at a time (dedicated telephone line required). A TMA expansion kit (Model 12509-043)
introduces an additional transceiver to the system for multiple simultaneous telephone polling. The
system will support up to eight transceivers. A dedicated telephone line is required for each transceiver.
