Phone Led (Red); Operation Monitor Led (Green); Dialing Format; Telephone Line Monitor - Bosch D9412GV3 Operation And Installation Manual

D9412GV3/D7412GV3 | Operation and Installation Guide | 7.0
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7.5

Phone LED (Red)

The red Phone LED illuminates when the control
panel seizes the telephone line and remains
illuminated until the control panel returns the
telephone line. Refer to Figure 11 on page 28 for the
location of the red LED.
7.6

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
sec on, 0.5 sec off.
This green LED also serves as a ring indicator. The
LED is located on the lower right side (Figure 11 on
page 28). When there is ring voltage on the telephone
line (the telephone is ringing), the green LED flashes
at a faster rate for the duration of each ring. Ring
voltage must reach a minimum of 45 VAC before the
system detects it.
7.7

Dialing Format

The system can be programmed to use dual tone
multi-frequency (DTMF) or pulse dialing. Refer to
Phone Parameters in the D9412GV3/D7412GV3
Program Entry Guide (P/N: F01U170807).
7.8

Telephone Line Monitor

The control panel has a built-in telephone line monitor
that tests the telephone line for voltage and current. If
the D928 Dual Phone Line Switcher is used to
connect two telephone lines to the control panel, both
lines are monitored. The normal voltage on a
telephone line is approximately 48 VDC (24 VDC for
some telephone systems).
If the control panel senses trouble, it starts a
programmable telephone line trouble timer, which
continues to run as long as the monitor detects
trouble. It resets to zero when the control panel
senses a normal line. If the timer reaches the delay
time in the Phone Supervision program item, it begins
a telephone line trouble response. Programming
determines what the response is. For programming
information, refer to Phone Parameters in the
D9412GV3/D7412GV3 Program Entry Guide
(P/N: F01U170807).
Any time the control panel uses the telephone line to
make a call or is on-line with the remote programming
software (RPS), it stops monitoring the telephone line
during this process. When the telephone line on the
control panel is no longer in use, it begins to monitor
the telephone line again.
Bosch Security Systems, Inc. | 10/10 | F01U143070-03
Bad Line Might Test OK: The telephone line monitor
uses voltage levels to test the status of the telephone
line. In some instances, a given telephone line might
be out of service without affecting the voltage on the
line. The telephone line monitor cannot recognize this
trouble condition.
7.9

Called Party Disconnect

Telephone companies provide "called party
disconnect" to allow the called party to 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. Control panel firmware allows for "called
party disconnect" by adding a 35-sec, "on hook"
interval to the dial tone detect function. If the control
panel does not detect a dial tone in seven sec, it puts
the telephone line on hook for 35 sec to activate
"called party disconnect," goes off hook, and begins a
seven-second dial tone detect. If no dial tone is
detected, the control panel dials the number anyway.
Each time the number is dialed, the control panel
records this as an attempt.
7.10

Communication Failure

After two attempts to reach the receiver over the
phone line, the control panel generates and sends a
COMM TROUBLE PH # event. If a backup route is
used, the event that triggered the telephone call to the
central station follows the COMM TROUBLE PH #
event.
After ten unsuccessful attempts to reach the receiver,
the control panel enters communication failure. The
control panel clears any reports queued for the failed
route and a COMM FAIL # event is generated and
display at the keypads. A trouble sounder can be
programmed to annunciate at the keypads.
One hour after the COMM FAIL # is generated, the
control panel attempts to send a restoration event. If a
communication failure still occurs, the keypad trouble
sounds again.
If the D928 Dual Phone Line Switcher is used, the
control panel makes a total of ten attempts before
entering communication failure.
Enhanced Communication
The D9412GV3 and D7412GV3 Control Panels can
send events over the SDI Bus to a DX4020 Network
Interface Module (NIM).For more information on the
enhanced communications capabilities, refer to
AUXPARAM in the D9412GV3/D7412GV3 Program
Entry Guide (P/N: F01U170807).
Telephone Connections
29