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3.10 Modem Test 3 Test and Diagnostic Operation Handbook
3.10 Modem Test
The Modem test checks the function of dial tone detection.
NOTE: Remember to plug phone line into the Modem connector of unit before this test
starts.
The test takes the Modem off-hook and checks for line current. Lack of line current is a failure,
as the Codec needs line current to work in this mode – it means that there is no phone line
connected, and the test will be aborted and showed “fail”. Then samples are taken, and checked
the following items:
Two tones.
Both tones within a band of 276 to 640 Hz.
Tone levels differ from average sample levels by a factor of 10.
The screen should display as below, indicating whether the test passed or failed when finished.
Satellite A30 Series Maintenance Manual 3-13