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Maintenance
P0914209
Standard 3.00
April 2000
A verbose mode is also available for the user. This mode provides a display
of in-progress test results and allows the user to see exactly which port, or
ports are not passing the test. The command to activate the verbose mode is
TEST VERBOSE (T V)
.
On-line Carrier Test
Test 1, the On-line Carrier test allows a T1 link to be tested without effecting
call activity. Test patterns are passed through the T1 link, looped back at the
distant end and checked at the near end. A failure is detected if the MCR does
not receive the data word within 100 ms. In this case, a failure peg counter
increases by 1. This counter’s maximum capacity is 65,000. At the end of the
test, the test results message will indicate how many failures occurred during
the test. If this test fails, it indicates problem in the MCRs, T1 link, or the
network. To isolate the failure to a specific piece of equipment further tests
will have to be run. The following figure demonstrates how the signaling is
looped back.
Figure 59
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 loop backed 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.
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
Test Vector
Test Vector
