D9124 Operation & Installation Manual
Page 42
© 1996 Radionics
74-06799-000-D 2/96
Location
To allow fire alarm communications to take priority over other telephone communication,
wire the D166 RJ31X jack before the in-house phone system to support line seizure (see
Figure 20). Wire the jack to the street side of the phone switch, ahead of any PBX
equipment. Line seizure provides for a temporary interruption of normal phone usage
while the communicator transmits data. After installation, confirm that the panel seizes
the phone line, acquires dial tone, reports correctly to the receiver, and releases the
phone line to the in-house phone system.
Figure 20: D166 RJ31X Jack Wiring
Phone Line Select Switch
Make sure the Phone Line Select switch on the left side of the D9112LTB is set in the
loop start position.
Ground start phone systems are not acceptable for fire systems.
☎
R1
T1
1
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R
T
PREMISES
PHONE
INCOMING
TELCO
LINE
FULL MODULAR PHONE JACK
RJ31X MODULE
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