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Other communications problems that can cause this condition include:
1. Events occurring faster than the dialer can send them, which overflows the 32 event
buffer,
2. Programming errors such as missing phone numbers or account codes, over 100 Trouble
reports in 24 hours, or
3. Other problems contacting a receiver.
Check dialing type, format selection, phone numbers, account codes, phone line condition and
tone programming (if tone burst formats are used).
For more information, see Communicator Operation, 47.
Trouble Phone
Some troubleshooting tips for phone monitor problems are listed below:
!
Warning!
High voltage!
The voltage present during ringing for an incoming call can be over 100 VAC.
1. Use a voltmeter to measure the voltage present across each phone line (Tip to Ring)
while the phone line is idle. This standby telco battery voltage is typically in the range of
30 VDC to 50 VDC, but any voltage above 5 VDC is accepted by the control panel. The
polarity of the voltage does not matter.
2. Check for other devices that might use the phone line, such as fax machines, credit card
verifiers or PBX systems. If the devices cannot be removed, ensure they are wired so that
the control panel’s line seizure relay disconnects them when needed. Measure the line
voltage while these devices are in use. Ensure that it stays above 5 V.
i
Notice!
NFPA 72 requirements mandate a dedicated phone line for fire reporting.
3. Check for intermittent faults in the phone line. Make a test call and confirm that the line
is free of distortion and noise. Temporarily swap Lines 1 and 2 on the control panel and
check if the problem indication moves to the control panel’s other phone line channel. If
so, the phone line is causing the problem rather than the line monitor.
4. Confirm that the fault message is phone fault and not com fault. Com fault is often
caused by failing to program a phone number or account number for Phone Number 2
while routing reports to Line 1, Backup Line 2. If only one phone number is available for
reporting, set report direction for all events to phone 1 only. Com fault can also happen if
one of the phone lines has telco battery voltage, but does not complete a call. Make test
calls to the receiver(s) on both phone lines, listening for the receiver ACK tone.
5. Ensure that two phone lines are available. In accordance with NFPA requirements, the
Auto-test report is sent on a different phone line each time it is sent. If only one phone
line is connected to the control panel, a Com fault is generated on every other test call.
10.5.2
Fire Alarm Control Panels Appendices | en 119
Bosch Security System, Inc. Installation and Operation Manual 2012.08 | 04 | F01U008458