This test is destructive.

For documentation purposes, the term DS1 applies to the DS1 Interface media modules.

The End Loopback/Span test deactivates an active loopback or span test on a DS1 media module. Bit error counting against the received test pattern stream halts, and sending of the framed 3-in-24 test pattern ceases. If either the CPE loopback jack or the far-end CSU is looped, the loopback deactivate code is sent. If the loopback could not be deactivated, the test will FAIL and a MINOR alarm is noted in the alarm log until the loopback is cleared.

The test is highly destructive and can only be initiated by entering the command test ds1-loop location end-loopback/span-test. Since only one of these three different long-duration loopback/span tests can be active at a time, the DS1 media module knows which loopback/span test to halt.

Enter busyout board to busy out all trunks or ports on the DS1 Interface media module before running this End Loopback/Span test.

Enter list measurements ds1 summary to show the length of time the test ran (Test Duration field) and number of bit errors detected (Loopback/Span Test Bit-Error Count field).

Enter release board to restore all trunks or ports on the DS1 Interface media module to the in-service state.