Phone Led (Red); Operation Monitor Led (Green); Dialing Format; Phone Line Monitor - Bosch D9412G Operations & Installation Manual

D9412G/D7412G | Operation & Installation Guide |
6.5

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 9 for the location of the red LED.
6.6

Operation Monitor LED (Green)

The green Operation Monitor LED indicates the
operation of the central processing unit (CPU). When
the CPU is operating normally, the LED flashes 0.5
second on, 0.5 second off.
This green LED also serves as a ring indicator. The
LED is located on the lower right side (see Figure 9).
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 system detects it.
6.7

Dialing Format

The system can be programmed to use DTMF or pulse
dialing. See Phone Parameters in the D9412G/D7412G
Program Entry Guide.
6.8

Phone Line Monitor

The control panel has a built-in phone line monitor that
tests the phone line for voltage. If the D928 Dual Phone
Line Switcher is used to connect two phone lines to the
panel, 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 voltage on the line falls
below 3.0 VDC.
If the monitor senses trouble, it starts a programmable
phone line trouble timer, which 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
D9412G/D7412G Program Entry Guide.
Any time the D9412G/D7412G uses the phone line to
make a call or is on-line with RPS, it ceases to monitor
the phone line during this process. Once the phone line
on the D9412G/D7412G is no longer in use, it begins
once again to monitor the phone line.
Bad Line May Test OK: The telephone line monitor
uses voltage 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 cannot recognize this trouble
condition.
Bosch Security Systems | 10/03 | 43488E
6.0 Telephone Connections
6.9

Called Party Disconnect

Telephone companies provide "called party disconnect"
to let the called party terminate a call. The called party
must go on hook (hang up) for a fixed interval before a
dial tone is available for a new call. This interval varies
with telephone company equipment. D9412G/D7412G
firmware allows for "called party disconnect" by adding
a 35-second, "on hook" interval to the dial tone detect
function. If the panel does not detect a dial tone in 7
seconds, it puts the phone line on hook for 35 seconds to
activate "called party disconnect," goes off hook, and
begins a 7-second dial tone detect. If no dial tone is
detected, the panel dials the number anyway. Each time
the number is dialed, the panel records this as an
attempt.
6.10

Communication Failure

After two attempts to reach the receiver, a COMM FAIL
PH # event is generated. This event is sent first,
followed by the original event.
After ten attempts to reach the receiver, the control
panel goes into communication failure. The control
panel clears any reports in its phone buffer and COMM
FAIL RTE # event is generated, which appears in the
display at command centers. A trouble sounder can be
programmed to annunciate at the command centers.
One hour after the COMM FAIL RTE # is generated,
the panel attempts to send this event, if programmed. If
the COMM FAIL RTE # event is the only event in the
queue and is unable to reach the central station, the
command centers do not turn on the trouble sounder
again.
If the D928 Dual Phone Line Switcher is used, the
D9412G/D7412G makes a total of ten attempts before
going into communication failure.
6. 1 0. 1

Enhanced Communication

The D9412G/D7412G Control Panels can transmit
events over the SDI Bus to a D9133TTL-E Network
Interface Module. For more information on the enhanced
communications capabilities, refer to RADXAUX1 in the
D9412G/D7412G Program Entry Guide.
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