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18. Press Menu Up "
19. Press BER.
20. Obtain the sensitivity by slowly reducing RF LEVEL until the
BER falls below 1000ppm. The sensitivity is the RF LEVEL reading
at this point. It must be < -88dBm.
21. Press Menu Up "
22. Press BEARER RELEASE and switch off the 9V supply.
23. Disconnect the RF cable from the PCB.
Note:
These tests can also be repeated on TRAFFIC CARRIERS 5 and 9.
8.5. TELEPHONE LINE TESTS
1. Switch on the 9V power supply.
2. Connect a telephone cord from the base unit to the line/DTMF test
set.
3. Enter "HOOKOFF" from the PC to invoke an off-hook condition.
4. Set the current limit to 40mA on the line simulator.
5. Enter "HOOKON" from the PC to invoke the on-hook condition.
6. Check that the line current has dropped to 0 ± 0.5mA.
7. Enter "HOOKOFF".
8. Use a DMM to test the off-hook voltage at TP50. It must be 6.5V ±
1.0V.
9. Enter "DTMF_UP" to make the base generate the upper DTMF
frequency.
10. Check that the upper frequency is detected by the line/DTMF test
set. Must be 1477Hz ± 1.5%.
11. Enter "DTMF_LO" to make the base generate the lower DTMF
frequency.
12. Check that the lower frequency is detected by the line/DTMF test
set. Must be 852Hz ± 1.5%.
13. Switch off the 9V power supply.
14. Disconnect the telephone line and reconnect the base to the Bell
" on the CMD60.
" on the CMD60.
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