System overview
1.42 EST3 Installation and Service Manual
Firefighter phone system
Five phone off-hook limit
The circuitry on the 3-FTCU Firefighter Telephone Control Unit
can support up to five telephones off-hook in addition to the
master handset at the 3-FTCU at any one time. The flexibility of
the EST3 system permits any number of phones to be wired on a
single phone circuit, as long as they are not all used
simultaneously. There are a number of different designs which
can be used to insure that no more than five phones are active at
any one time.
One phone per circuit
The advantages of installing a single firefighter phone station or
jack on a SIGA-CC1 Signature module (personality code 6) are
numerous. The system provides complete control and
annunciation phone/circuit. Installing a single phone on a circuit
permits the operator to immediately identify the exact location of
the calling party. Because the 3-FTCU will only permit five
circuits to be connected simultaneously, the maximum number
of off-hook handsets can never be exceeded. Should a branch
telephone circuit be damaged during a fire, the fault will not
affect other phone circuits. When there is only one phone per
circuit, troubleshooting of faults is simplified.
The largest disadvantage of installing one phone per branch
telephone circuit is cost. Each phone location requires a separate
SIGA-CC1 module.
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