E-DIG-STA (Emulated Digital Line)
Issue 5 October 2002
1157
555-233-119
Voice and Control Channel Local Loop Test (#13)
These tests check the information and control channels between the Switch
Processing Element (SPE) and the Digital Line port circuit. The SPE sends a
message to loop around both the information and control channels for the port.
First, the primary information (voice) channel loopback 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 test is the
same as Conference Test #6.
The four tests will generate only one resulting value (Pass, Fail, or Abort). If any
test fails or aborts, the test sequence stops.
PASS
The port is correctly using its allocated time slots.
1. To ensure that this is not an intermittent problem, repeat this test a
maximum of 10 times.
2. If complaints persist, examine the station, connections, and wiring.
Table 249.
TEST #9 Digital Line NPE Crosstalk Test — Continued
Error
Code
Test
Result
Description/Recommendation
Continued on next page