GXE502X User Manual 11/2/2009
14
Automatic Detection:
This section will be of great help to the user in order to determine the impedance, call progress
tones and current disconnect settings on the FXO ports of the GXE.
Remember that the impedance on the FXO ports must be as close as possible to the impedance
on your PSTN lines in order to reduce echo. If we do not match the impedance then we will have
problems with echo on calls, calls getting dropped and faxes not getting received.
Call progress tones will tell the GXE when the line has dial tone, when the line is getting ringback
tone and when to disconnect the line based on the busy tone heard at the end of a conversation.
These tones vary from country to country and the user must configure them according to the
geographical location where the GXE will be installed.
Current disconnect is a method used in a few countries, including the USA, that removed the
current from the line for a split second following the end of a conversation. This method is used to
determine when the line has been disconnected.
If the user ignores these settings the GXE may not work properly. No country in the world should
be using current disconnect and tone disconnect simultaneously, but these settings depend
completely on the central office. Impedance on the PSTN lines could vary from one to another as
the physical medium is susceptible to many changes.
Before starting the auto detection please make sure that the wires in your PSTN line are in the
correct order and that they work properly connected to an analog phone directly. You will need to
know the PSTN numbers corresponding to each wire.
Caller FXO (detected FXO): This will be the FXO port that we will detect the values for. Please
insert the line number (FXO port in the back of the GXE) and the PSTN line number for it. In other
words if we have a PSTN line connected to FXO port 1 with the phone number 469-241-0100. We
should type in 1 for the line number and 4692410100 for the PSTN number.
The important thing is to enter the PSTN numbers as if they were to dial each other locally
(because they will). So you do not need to include country codes or area codes if your PSTN
provider does not require you to input them. Do not include any dashes.
Called FXO: This is the FXO port that the caller FXO will call in order to run the tests. Simply input
the FXO port number and the PSTN number as explained above.
You can only test for one parameter at a time!
This means that you can only test for impedance or current disconnect or tone disconnect at a
single time.
Once you start the test all the services on the GXE will be stopped, and the user will have to
reboot the GXE for the services to restart.
Select only one of the tests and then click on start detect. The auto detection process will take a
few minutes; once it is done it will pop up a window with the test results. You must make a note of
these results and then apply them yourself manually after reboot. In other words the results do not
take place automatically!
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