Avaya Nortel Communication Server 1000 Reference page 241
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Also See for Nortel Communication Server 1000:
- Manual (570 pages) ,
- Configuration manual (350 pages) ,
- Hardware installation and maintenance (262 pages)
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Man-Machine E1 maintenance interface software
Figure 65: MMI Local loopback test
Test 2, external loopback, applies an external loopback to the E1 link. Test data is generated
and received by the LEI on all timeslots. If test 1 passes but test 2 fails, it indicates that the E1
link is defective between the LEI and the external loopback location. If test 1 was not run and
test 2 fails, the E1 link or the LEI could be defective. To isolate the failure to the E1 link, tests
1 and 2 must be run in tandem.
Figure 66: MMI External loopback test
on page 241
demonstrates how an external loopback is applied to the E1 link.
Figure 66: MMI External loopback test
Test 3, network loopback, loops the LEI's received E1 data back toward the CPE. No test data
is generated or received by the LEI. If test 2 passes but test 3 fails, it indicates that the CPE
device is defective. If test 2 was not run and test 3 fails, the E1 link or the CPE device could
be defective. To isolate the failure to the CPE device, tests 2 and 3 must be run in tandem.
Figure 67: MMI Network loopback test
on page 241 illustrates how the signaling is looped
back toward the CPE.
Figure 67: MMI Network loopback test
Circuit Card Reference
July 2011
241
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