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impedance.
12. Enter "DTMF_UP" to make the base generate the upper DTMF
frequency.
13. Check that the upper frequency is detected by the line/DTMF test
set. Must be 1477Hz ± 1.5%.
14. Enter "DTMF_LO" to make the base generate the lower DTMF
frequency.
15. Check that the lower frequency is detected by the line/DTMF test
set. Must be 852Hz ± 1.5%.
16. Switch off the 9V power supply.
17. Disconnect the telephone line and reconnect the base to the Bell
oscillator.
18. Switch on the 9V supply.
19. Enter "RINGDET" to check the ring detection status. The
command returns a number to the PC display. "0" = no ring.
20. Switch the bell oscillator on to 23Hz, 30V RMS (Sin Wave).
21. Send the batch file "RINGDET".
22. Check that the Number on the PC display has changed to "1".
23. Switch off the 9V power supply.
8.7. BASE UNIT REFERENCE DRAWING
When connecting the Simulator and the Equipments to the P.C.B. for checking, refer to the
illustrations below.
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