Comrex Access NX, Руководство по эксплуатации продукта

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troublEShootINg potS CoNNECtIoN
There are dozens of factors that can affect the success or failure of a POTS codec call, some within the user’s control and
some not. Here’s a short list of rules to follow for POTS codec connections:
1 Use the POTS codec on a direct telephone company line and avoid in-house phone systems. A line
used by a fax machine usually provides this direct access. (Be sure to disconnect the fax machine
before connecting the codec!)
2 Check to see that there are no extensions or modems on the line you are using — or at least
arrange that no one uses these during your broadcast.
3 If there is call-waiting on your line, disable it by entering “*70” in front of the number you are
dialing.
4 If possible, try the POTS codec out at the remote site before your actual broadcast at about the
same time of day that you plan to use it. This will give you a good idea of expected connect rates
and possible line problems.
5 At minimum, connect a few minutes before airtime to assess the connection quality. Setting a
MaxRate on the POTS codec, based on your findings, is highly recommended. MaxRate usually
should be set at a level or two below the maximum unrestricted rate. This will provide a “guard
band” of sorts against noise and corruption which may cause errors on the line.
6 If operation starts to degrade after a long period of connection, it may be that the phone line
parameters have changed. These parameters are affected by factors such as time of day, weather
and geographic location. The modems should be given the opportunity to renegotiate for these
new parameters.
7 If you experience low connection rates or errors, try redialing. If that does not help, dial from the
other end. If the call is long distance, try forcing the call to another carrier. If a good connection is
found, keep that line up.