Nortel Meridian 1 Mini-Carrier Remote, Описание, установка и обслуживание

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P0914209 Standard 3.00 April 2000
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 62
Off-line network loopback test
Off-line Loopback Toward Network Test
Test 5, the Off-line Loopback Toward Carrier 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 Carrier test on the
near end or the distant end. No failure is indicated. The test simply performs
a loopback toward the network on the T1 link. This test can be used to isolate
network problems.
Figure 63
Off-line loopback toward network test
N e a r M C R C a r d F a r M C R C a r d E x t e r n a l N e t w o r k
T1 Traffic T1 Traffic
N e t w o r k L o o p b a c k
Test Vector
N e a r M C R C a r d F a r M C R C a r d E x t e r n a l N e t w o r k
T1 Traffic T1 Traffic