Nortel NT1R20, Description, Page: 148 / 316

Page 124 of 290 NT5D11 Line-side T1 Interface Card
553-3001-105 Standard 5.00 June 1999
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, be sure to 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 30 shows which test to run for the associated equipment.
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 line-side T1 card is defective. Figure 26
demonstrates how the signaling is looped back toward itself.
Table 30
MMI Tests
Test Number Equipment Tested Test Description
1 line-side T1 card Local loopback
2 T1 link, line-side T1 card
and T1 network External loopback
3 CPE device and T1
network Network loopback