Nortel Communication Server 1000 Fundamentals page 112

112 Maintenance
Figure 64
On-line Carrier test
Off-line Near-end Loopback test
Test 2, the Off-line Near-end Loopback test loops the near-end signal
back toward the near-end MCR. Test data is generated, sent through the
framer, LIU, and magnetics, then looped back through relays towards the
board. A failure is detected if the MCR does not receive the data word
that was sent. If a failure occurs, a failure peg counter is incremented.
This counter will saturate at 65,000 counts. At the end of the test, the test
results message will indicate how many failures occurred during the test. A
failure on test #2 indicates a near-end defective MCR Circuit Card.
Figure 65
Off-line Near-end loopback test
This test can also be issued with a distant modifier. Entering T D will
cause your MCR card to command the far-end MCR to run its Off-line
Near-end Loopback test.
Note:
unable to stop the far-end MCR from running the command.
Off-line Distant-end Loopback test
Test 3, the Off-line Distant-end Loopback test loops the distant-end signal
back towards the near end. You can perform the Off-line Distant-end
Loopback test on the distant-end MCR. A failure is detected if the MCR
This command is limited to 10 minutes because you will be
Nortel Communication Server 1000
Mini-Carrier Remote Fundamentals
NN43001-557 04.01 4 June 2010
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