Nortel Communication Server 100 Manual page 180

180 Carrier Remote IPE maintenance
Test #3 tests the far-end card by looping back the carrier link side on the
distant card and verifies if that card is good.
Test #4 tests the carrier link side by looping back at the near-end or
far-end CSU to test the link from the telco demarcation point to the local
system or Carrier Remote IPE or from the far-end CSU to test the carrier
link.
Test #5 provides a near-end loopback on the card to allow the distant
testing of the near-end card across the carrier link.
Test #2 and #3 can occasionally show false failure indication when a false
bit error is detected by the test logic, falsely indicating a test failure. If only
one or two errors are shown out of 15 tests, try the test again. If the test
passes on the second or third attempt, the carrier is probably performing
correctly.
To verify the performance, execute C A and C A D to clear errors. Then
display performance by executing the D P and D P D commands. The
carrier is operational if no additional errors are detected.
The STOP command terminates a test prematurely; however, it does not
terminate the remote loopback during carrier Test #3 and can interrupt
the traffic for several seconds. If the STOP command causes a problem,
execute Test #3 again with 0 duration to undo the far-end loopback or do
not use the STOP command on Test #3.
Test 5 places the carrier in the loopback and test 4 works only if an
external loopback is established first at the network or at the far-end.
Split pairs in the twisted pair patch cable between the telco network
interface and the Local and Remote Carrier Interface cards can cause
repetitive loss of frame errors despite passing loopback tests on both ends
of the cable.
Follow the steps in
the carriers.
Procedure 45
Testing the carriers
Step
1
2
Procedure 45 "Testing the carriers" (page 180)
Action
Logon and type T and press the Enter key to display the
selection of tests.
Select the appropriate test number and press the Enter key:
Nortel Communication Server 1000
Carrier Remote IPE Fundamentals
NN43021-555 04.01 4 June 2010
Copyright © 2007-2010 Nortel Networks. All Rights Reserved.
to test