D9412GV2/D7412GV2 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 8 on page 27 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 8 on page 27). 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 DTMF or pulse dialing. Refer to Phone Parameters in the D9412GV2/D7412GV2 Program Entry Guide

(P/N: F01U003636).

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, the control panel monitors both lines. The normal voltage on a telephone line is approximately 48 VDC (24 VDC for some telephone systems). The telephone line monitor senses trouble if voltage on the line falls to

5.0to 7.0 VDC without a corresponding 13 mA of current.

If the monitor senses trouble, it starts a programmable telephone line trouble timer, which continues to run as long as the monitor senses 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. Refer to Phone Parameters in the D9412GV2/D7412GV2 Program Entry Guide

(P/N: F01U003636).

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-second, “on hook” interval to the dial tone detect function. If the control panel does not detect a dial tone in 7 seconds, it puts the telephone line on hook for 35 seconds 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, the control panel generates and sends a COMM FAIL PH # event. The event that triggered the telephone call to the central station follows the COMM FAIL PH # event.

After ten attempts to reach the receiver, the control panel enters communication failure. The control panel clears any reports in its telephone buffer and COMM FAIL RTE # event is generated, which appears in the display at keypads. A trouble sounder can be programmed to annunciate at the keypads.

One hour after the COMM FAIL RTE # is generated, the control panel attempts to send this event. If the COMM FAIL RTE # event is the only event in the queue and cannot reach the central station, the keypads do not turn on the trouble sounder 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 D9412GV2 and D7412GV2 Control Panels can send events over the SDI Bus to a DX4020 or D9133TTL-E Network Interface Module (NIM). For more information on the enhanced communications capabilities, refer to GV2AUX in the D9412GV2/D7412GV2 Program Entry Guide

(P/N: F01U003636).

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Bosch Security Systems, Inc. 5/05 F01U003641B

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Bosch Appliances D9412GV2 manual Phone LED Red, Operation Monitor LED Green, Dialing Format, Telephone Line Monitor
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D9412GV2 specifications

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