Campbell Scientific COM320 Voice Communications Modem - Manual (Page 31)

COM320 Voice Communications Modem
7.2 Communications Problems
Voice Mode
1) Can’t get beyond the initial voice announcement
a) The security code was not received. Try pressing # again, then xxx#
again (where xxx = modem security code).
2) Pressing handset keys sometimes fails to produce the correct response.
a) Handset keys not being pressed long enough.
b) Key presses (especially # #) were not spaced far enough apart and the
station is waiting for the last key (#).
c) Phone line introducing excessive noise or signal attenuation.
d) Handset introducing excessive noise or producing too low signal
levels.
3) Station has become unresponsive (try the following in the order given).
a) Press # which will usually announce the current menu again.
b) Press five or more * (star) keys in rapid succession to recover.
c) Allow station to time out and disconnect (usually 15 – 40 sec, rarely 5
min), then call again.
4) Volume levels vary.
This is normal due to the PCM voice encoding compression scheme.
Sometimes the modem will negotiate a higher volume for a given
connection.
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