Man-Machine T1 maintenance interface software 253
Figure 44
MMI external loopback test
Test3, network loopback, loops the received T1 data back toward the CPE
equipment. No test data is generated or received by the Lineside T1 card. If
test 2 passes but test 3 fails, itindicates that the CPE device is defective. If
test 2 was not run and test 3 fails, the T1 link or the CPE devicecould be
defective. Toisolate the failure to the CPE device, tests 2 and 3 must be run
in tandem. Figure 45 "MMI network loopback test" (page 253) demonstrates
how the signaling is looped back toward the CPE equipment.
Figure 45
MMI network loopback test
The TestCarrier (T C) command set enables tests to be run on the Lineside
T1 card, the T1 link, or the CPE device. These three tests provide the
capability to isolate faulty conditions in any oneof these three sources.
See Table110 "MMI Tests" (page 254) for additional information on these
three test types.
After entering the T C command set, select which test to start. The prompt
appears, similar to the following:
Test 1: Local Loopback Test
Test 2: External Loopback Test
Test 3: Network Loopback Test
(1,2,3 or S to cancel):
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23May 2008
Copyright© 2003-2008, Nor tel Networks
.