Nortel NT1R20 Description page 211

Figure 48
Test Carrier (T) screen
Test 1: Local Loopback Test
Test 2: External Loopback Test
Test 3: Network Loopback Test
(1,2,3 or S to cancel):
Figure 49
Test parameters screen
Enter Duration of Test (1-98 Mins, 0 = Once, 99 = Forever)
Test will interfere with traffic.
NT5D33 and NTRB34 Line-side E1 Interface Cards
Tests can be performed once, for one through 98 minutes, or continuously
(selected by entering 99 minutes) until a Stop Test command is entered.
Tests will continue for the duration specified even if a failure occurs, and will
terminate at the end of the time period or when a Stop Test command is
issued. Only this command will stop a test with a duration selection of 99,
however the STOP command can terminate a test set to any duration from
one to 99. After entering the test number selection, a prompt similar to
Figure 49 will appear:
Before a test is run, be sure to verify that the card is disabled since the tests
will interfere with calls currently in process.
During a test, if an invalid word is received, this is recorded via a failure peg
counter. The peg counter has a limit of 65,000. At the end of the test, the Test
Results message will indicate how many failures, if any, occurred during the
test.
Table 47 shows which test to run for the associated equipment:
Hit Q to quit or any Key to Continue
Page 187 of 290
Line cards Description