GXE502X User Manual 11/2/2009
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played. Typically these tones are made up of 2 or 3 frequencies and are reproduced according
to an on and off cadence. The “on” cycle means that the tone is played for certain duration of
time, and the “off” cycle means that only silence is played for certain duration of time. In order
to avoid false tone detections, the BT event can be configured so that the user can specify how
many cadence cycles need to be detected in order for a call to be disconnected.
Polarity Reversal Disconnect:
If set to “Yes”, calls will be terminated after a polarity signal reversal. The default value is No.
AC Terminal Impedance Scheme:
Users can select one of two options for the AC termination scheme: Country (rough and easy)
or the Model of related Impedance values (real and complex).
Please make note that inappropriate parameters may cause echo or popping noises on the
lines.
Please consult with your local Telco Carrier before configuring these fields.
AC Terminal Impedance:
This depends on whether Country or Model is selected, either 17 Countries are selectable or
users have to select the Impedance value used by the local PSTN carriers.
Gain(dB):
This option allows the user to increase or decrease the power level of the signal (audio) sent or
received on the FXO ports. Remember that we are using a logarithmic scale in this case and
that increasing the level by 3dB will actually double the power level sent to the PSTN. In a
similar way, decreasing the power level by 3dB will cut in half the power level of the signal
received.
Transmit (TX) to the PSTN: This controls the power level sent out to the PSTN.
Receive (RX) from the PSTN: This controls the power level received from the PSTN.
Jitter Buffer Type:
This option allows the user to toggle between an adaptive or fixed jitter buffer.
This will help in eliminating jitter in the communications by buffering some packets before
transmitting them.
Call Progress Tones: This feature lets you configure tones to match the FXO line regional
settings.
In certain countries, the carriers or central office will send special tones to indicate certain events
on the PSTN side. For example, when a call is disconnected from the remote side the other side
will hear a busy tone indicating that the call is terminated. Also, a dial-tone is used by the central
office to signal that it is ready to receive digits and process the call. Users can pre-configure these
tones in the GXE502X. However users must know the correct frequency values and cadences of
these tones from the PSTN carrier. Wrong parameters may cause the GXE502X to malfunction
due to incorrect tone settings.
In other words, the user MUST configure the call progress tones in order for the GXE to work
properly. For more information about troubleshooting this please refer to the HELP section under
this menu on the GXE’s web UI.
Here is an example for the syntax for a busy tone in the U.S.A:
Syntax: f1=freq@vol, f2=freq@vol, c=on1/off1-on2/off2-on3/off3; [...]
(Note: freq: 0 - 4000Hz; vol: -30 - 0dBm; c: (cadence) in msec, several cadences allowed)
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