Communication Failure; Table 8: Troubleshooting Communication Failures - Bosch D7412G Installation & Troubleshooting Quick Reference Manual

D9412G/D7412G/D7212G
Troubleshooting
3.6

Communication Failure

The panel goes into Communication Failure after ten unsuccessful attempts to reach the receiver. Follow the procedure in
Section 3.5 Phone Line Trouble on page 11 to verify that there is no problem with the phone lines at the installation. If the
phone lines are good, monitor the lines (preferably at the receiver) for the symptoms listed below.
Symptom
The line rings but the D6500
receiver does not pick up. The
Ring indicator LED on line card
does not light. You cannot hear
ring with headset at receiver
location.
The panel is unable to call out
when all 246 points are faulted.
The line rings but the receiver
does not pick up. The Ring
Indicator LED on line card lights.
You can hear ring with test set at
receiver location.
The panel reaches a busy signal for
all ten attempts to reach the
receiver.
The receiver answers the call and
provides an acknowledgment
tone, but the communicator does
not transmit reports.
Panel does not connect to central
station.
The receiver answers the call and
provides an initial "handshake"
acknowledgment, but does not
acknowledge the panel's report
transmission with a "kiss-off"
acknowledgment.
D9412G/D7412G/D7212G Installation & Troubleshooting Quick Reference Guide
43700F
Diagnosis
Line is not ringing at
the receiver.
The total current
draw is too much for
the panel.
Line card in receiver
may be faulty.
Calls are not reaching
the receiver.
The receiver's call
load is too great.
The receiver is not
producing the correct
acknowledgment
tone.
The D136 relay used
for ground start
phone systems is
inserted incorrectly.
The receiver is not
compatible with the
panel's transmission
format.
Noisy phone lines are
interfering with
report transmission.

Table 8: Troubleshooting Communication Failures

Page 12
Remedy
Verify that the lines are correctly connected to the
receiver.
Verify that correct prefixes and phone numbers for the
receiver have been programmed into the panel.
If completing the steps above does not correct the
problem, contact your telephone company repair
service.
Put command centers on a separate power supply to
get maximum current draw from points in alarm.
Review receiver manuals for troubleshooting
procedures.
Verify that correct prefixes and phone numbers for the
receiver have been programmed into the panel.
Verify that the phone lines are not shorted between the
phone company's equipment and the receiver by
placing a call to the number for the receiver. If you
hear the line ring, but the ring detector doesn't light,
or if you hear a busy signal and the green on line (OL)
indicator is not lit, call the phone company for service.
Additional line cards and phone lines may be needed
for the receiver
Verify that the receiver is producing a 1400 Hz, 2300
2
Hz, or Modem IIIa acknowledgment tone.
Insert the D136 relay in the GND STARTsocket
correctly. Also check that phone line is connected and
that phone jack is wired properly. See the Ground Start
section in the panel's Operation and Installation Guide
for instructions.
Verify that the receiver is compatible with the format
the panel is using (either BFSK or Modem IIIa
Communications Format). See the Telephone
Connections section in the panel's Program Entry
Guide.
The panel requires D6500 MPU and Line Card
EPROM revision 8.00 or higher.
Try making a voice call to the receiver on the line to
verify the noisy condition. It may be necessary to have
the phone company check the lines.
© 2004 Bosch Security Systems, Inc.
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