Bosch Appliances D7412GV3 7.5Phone LED Red, 7.6Operation Monitor LED Green, 7.7Dialing Format

D9412GV3/D7412GV3 Operation and Installation Guide 7.0 Telephone Connections

7.5Phone 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.

7.6Operation 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.

7.7Dialing 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).

7.8Telephone 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.

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.

7.9Called 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.

7.10Communication 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).

Bosch Security Systems, Inc. 10/10 F01U143070-03 29