D9112 Operation & Installation Manual
Page 28
74-06144-000-C 2/96 © 1993-1996 Radionics
Phone Cord Connection
Connect one end of a D161 (8') or D162 (2') Telephone Cord to the D9112 TELCO Cord
connector, J3, located on the bottom left corner of the D9112. See Figure 7. Connect the
other end to the RJ31X jack.
Phone LED (Red)
The red Phone LED lights when the panel seizes the phone line and remains lit until the
panel returns the phone line. See Figure 7 for the location of the red LED.
Operation Monitor LED (Green)
The green LED indicates the operation of the CPU (Central Processing Unit). When the
CPU is operating normally, the LED flashes 0.5 second on, 0.5 second off.
The green LED also serves as a ring indicator. See Figure 7 for the location of the LED.
When there is ring voltage on the phone line (the phone is ringing), the green LED
flickers at a faster rate for the duration of each ring. Ring voltage must reach a minimum
of 45 VAC before the D9112 detects it.
Dialing Format
You can program the D9112 to use DTMF or pulse dialing. See

Phone Parameters

in the
D9112 Program Entry Guide
(74-06145-000).
Phone Line Monitor
The D9112 panel has a built-in phone line monitor that tests the phone line for voltage
and current. If you use the D128 Dual Phone Line Switcher to connect 2 phone lines to
the D9112, the panel monitors both lines. The normal voltage on a telephone line is
approximately 48 VDC (24 VDC for some phone systems). The phone line monitor
senses trouble when the voltage on the line falls below 4.5 to 7.5 VDC, without a
corresponding current increase to 8 to 13 mA.
If the monitor senses trouble, it starts a programmable phone line trouble timer. The timer
continues to run as long as the monitor senses trouble. It resets to zero when the panel
senses a normal line. If the timer reaches the delay time in the

Phone Supervision

program item, it begins a phone line trouble response. Programming determines what the
response is. See

Phone Parameters

in the
D9112 Program Entry Guide
(74-06145-000)
.
The panel stops monitoring the phone line during its phone line trouble response. If the
response includes sending a report, the panel does not resume monitoring until the report
is acknowledged or it goes into communication failure.

Bad line may test OK:

The telephone line monitor uses voltage and current levels to
test the status of the phone line. In some instances a given telephone line may be out of
service without affecting the voltage on the line. The phone line monitor can not
recognize this trouble condition.
NCI

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