Bosch Appliances D7212G manual Operation Monitor LED Green, Dialing Format, Phone Line Monitor

D7212G

Telephone Connections

6.6Operation Monitor LED (Green)

The green Operation Monitor LED indicates the operation of the CPU (Central Processing Unit). When the CPU is operating normally, the LED flashes 0.5 sec. on, 0.5 sec. off.

The green LED also serves as a ring indicator. The LED is located on the lower right side (see Figure 9 on page 31). 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.

6.7Dialing Format

The system can be programmed to use DTMF or pulse dialing. See Phone Parameters in the D7212G Program Entry Guide (P/N: 4998138538).

6.8Phone Line Monitor

The panel has a built-in phone line monitor that tests the phone line for voltage. The normal voltage on a telephone line is approximately 48 VDC (24 VDC for some phone systems). The phone line monitor senses trouble when the voltage on the line falls below 3.0 VDC.

If the monitor senses trouble, it starts a programmable phone line trouble timer. The timer 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 D7212G Program Entry Guide (P/N: 4998138538).

Anytime the D7212G uses the phone line to make a call(s) or is on-line with RAM IV, it ceases to monitor the phone line during this process. Once the phone line on the D7212G 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 can not recognize this trouble condition.

6.9Called 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. D7212G 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 seven seconds, it puts the phone 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 panel dials the number anyway. Each time the number is dialed, the panel records this as an attempt.

6.10Communication Failure

After two attempts to reach the receiver, a COMM FAIL PH # event is generated. This event (COMM FAIL PH #) will then be sent first, followed by the original event.

After ten attempts to reach the receiver, the panel goes into communication failure. The 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. An hour after the COMM FAIL RTE # is generated, the panel attempts to send this event (COMM FAIL RTE #), 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 will not turn on the trouble sounder again.

6.10.1Enhanced Communication

The D7212G Control/Communicator has the ability to transmit events over the SDI Bus to a D9133TTL-E Network Interface Module. For more information on Enhanced Communications capabilities, please refer to RADXAUX1 in the D7212G Program Entry Guide (P/N: 4998138538).

D7212G Operation and Installation Guide

4998138544C Page 32 © 2003 Bosch Security Systems