Troubleshooting
Q. What if there appears to be random triggering of the DualCom ?
Ensure that 0 volts is common across all parts of the alarm system.
If the DualCom receives its power from a Power Supply that is additional to
the alarm system, ensure that the 0 volt connection on the additional power
supply is connected to the 0 volt connection on the alarm system.
Q. What if the Telephone path signal is not received by the Alarm
Receiving Centre ?
Use the A & B Buttons to check that the PSTN path is active. See Appendix
1, Table 31.
Check that the PSTN line is properly connected. Check with a meter that
approximately 50 volts DC is present across the PSTN terminals marked A
and B (25-33v if connected to a PABX). Connect a telephone to the PSTN
line and make a call to ensure that it is fully functional. (Note the screw-
driver access holes to avoid removing the DualCom’s lid). Remove telephone
after test.
Disconnect any other equipment that is using the same PSTN line to en-
sure that it is not inhibiting the DualCom.
Where ADSL (Broadband) digital signals are on the telephone line ensure
that an ADSL (Broadband) filter is fitted between the DualCom’s telephone
terminals and the PSTN line. See page 39 & 40.
Check that when the DualCom’s PSTN path is triggered, the voltage across
the telephone line A and B terminals drops to between 6 and 12 volts DC.
Ensure that ‘call barring’ to the ARC Receiver telephone number has not
been set on the PSTN line used by DualCom. Test using a telephone to call
the ARC receiver number.
See Appendix 1, Table 18 for Line Monitoring indications. These will help
diagnose line problems.
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