Nortel Communication Server 1000 Fundamentals page 113

does not receive the data word that was sent. If a failure occurs, the 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 3 indicates a far-end defective
MCR Circuit Card or a bad T1 link.
Figure 66
Off-line Distant-end Loopback test
Off-line Network Loopback Test
Test 4, the Off-line Network Loopback test assumes that a loopback is
configured somewhere in the network. Test data is generated at the
near-end MCR and received at the near end. You can perform the Off-line
Network Loopback test on the near end or the distant end. A failure is
detected if the MCR does not receive the data word within 100 ms. In this
case, 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. This test could be performed
with the carrier looped back toward the MCR at the LTU, or anywhere
along the carrier link to determine the location of a carrier link failure.
Figure 67
Off-line Network Loopback test
Off-line Loopback Toward Network Test
Test 5, the Off-line Loopback Toward Network test loops the signal from
the MCR toward the carrier. No test data is generated or received at either
end of the link. You can perform the Off-line Loopback Toward Network
Nortel Communication Server 1000
Mini-Carrier Remote Fundamentals
NN43001-557 04.01 4 June 2010
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MMI diagnostic tools 113