Nortel Circuit Card Installation Manual page 242

Page 242 of 906
553-3001-211 Standard 3.00
NT5D11 and NT5D14 Lineside T1 Interface cards
Tests can be performed once (for 1 through 98 minutes), or continuously
(selected by entering 99 minutes) until a "Stop Test" command is entered.
Tests continue for the duration specified even if a failure occurs, and
terminate at the end of the time period or when a "Stop Test" command is
issued. Only a "Stop Test" command will stop a test with a duration selection
of 99. After entering the test number selection, a prompt similar to the
following will appear:
Enter Duration of Test (1-98 Mins, 0 = Once, 99 =
Forever)
Verify DS-30A Links are disabled.
Hit Q to quit or any Key to Continue
Before a test is run, verify that DS-30A links are disabled since the tests will
interfere with calls currently in process.
During a test, if an invalid word is received, a failure peg counter is
incremented. The peg counter saturates at 65,000 counts. At the end of the
test, the Test Results message will indicate how many failures, if any,
occurred during the test.
Table 91 shows which test to run for the associated equipment.
Table 91
MMI Tests
Test number
1
2
3
Test 1, local loopback, loops the T1 link signaling toward itself at the
backplane connector, and test data is generated and received on all timeslots.
If this test fails, it indicates that the lineside T1 card is defective. Figure 34 on
page 243 demonstrates how the signaling is looped back toward itself.
August 2005
Equipment tested
Lineside T1 card
T1 link, lineside T1 card
and T1 network
CPE device and T1
network
Test description
Local loopback
External loopback
Network loopback