FXS-ID Configuration
8-12 9/24/01
8.7.3 “Busying Out” Individual FXS Channels
Switching a channel test switch to the ON position has three results on the selected FXS channel:
1. To confirm individual channel circuit integrity, 4 seconds of ringing voltage are sent to the
Tip and Ring pair. The Tip is then ground ed unti l the channel test switc h is tu rned to th e OFF
position (to the right).
Warning: Four seconds of ringing voltage (85 V) will be present at the Tip
and Ring pair of the FXS channel-under-test until the test telephone is picked
up to trip the ringing.
Requirement: A test telephone connected to the punch down block or RJ-11 Harmonica
should ring for 4 seconds.
2. As an aid to network technicians troubleshooti ng audio probl ems, 4 seconds of ri ngback tone
are also sent toward the T1 network.
3. After the 4 seconds of ringback tone , the FXS cha nnel will “busy out” toward t he T1 networ k
side.
Note: Each channel test switch can provide ringing during Trunk Processing (or
even when the T1 line is disconnected).
8.7.4 Self Test Loopbacks
During Self-Test, switching a channel test switch to the ON position has the following result:
The affected FXS channel receives 4 seconds of ringing voltage (85 V) and the LED for that particu-
lar channel turns RED. This allows a technician to ring the telephone and verify audio tone when it is
answered.
Note: During Self Test, a RED channel LED may come on, but does not indicate a
problem.
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