Phone Led (Red); Operation Monitor Led (Green); Dialing Format; Telephone Line Monitor - Bosch D7212GV3 Operation And Installation Manual

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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 9 on page 26 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 9 on
page 26). 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 D7212GV3 Program Entry
Guide (P/N: F01U170808).
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 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
D7212GV3 Program Entry Guide (P/N: F01U170808).
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.
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.
Bosch Security Systems, Inc. | 10/10 | F01U143079-03
D7212GV3 | Operation and Installation Guide | 7.0
7.9
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
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.
Enhanced Communication
The D7212GV3 Control Panel 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 D7212GV3 Program Entry Guide
(P/N: F01U170808).

Called Party Disconnect

Communication Failure

Telephone Connections
27