Avaya S8700 Maintenance Manual page 1453

E-DIG-STA (Emulated Digital Line)
Voice and Control Channel Local Loop Test (#13)
These tests check the information and control channels between the media server
and the Digital Line port circuit. The media server sends a message to loop
around both the information and control channels for the port. First, the primary
information (voice) channel loop-back test sends a digital count from the
Tone-Clock circuit pack on the primary information channel time slot and receives
the same digital count with a General-Purpose Tone Detector.
While the primary information channel is still looped around, the Control Channel
Loop-around test sends four different transparent patterns to the on-board
microprocessor, receives them back, and compares them.
The Loop Around test for the secondary information (data) channel is the same as
the primary information channel loop around test and is performed only if a DTDM
is administered.
Next, a Conference test checks the primary information channel. This is the same
test as Conference test (#6).
The four tests generate only one result: Pass, Fail, or Abort. If any test fails or
aborts, the test sequence stops.
555-233-143 Issue 1 May 2002 8-731