This test is destructive.
For documentation purposes, the term DS1 applies to the DS1 Interface media modules.
The CPE Loopback Jack (CLJ-LB) test causes a loopback at the CPE loopback jack and tests the building wiring connection between the DS1 board and the CPE loopback jack.
The test is highly destructive and can only be initiated by entering the command test ds1-loop location cpe-loopback-jack-test-begin [number-of-bits bit-pattern]. Enter a loopback activation code on the command line or use the default code (0x47F).
Enter busyout board to busy out all trunks or ports on the DS1 Interface media module before running the CPE Loopback Jack test.
Use busyout board to busy out all trunks or ports on the DS1 Interface media module before running the CPE Loopback Jack test.
The CPE Loopback Jack test has the DS1 Interface media module transmit a loopback activation code to the CPE loopback jack, waits up to 10 seconds for return of the code to verify the loopback has been established, transmits a framed 3-in-24 test pattern, begins counting bit errors in the received test pattern, and returns a PASS result to indicate that the pattern was successfully sent. If the loopback is not established within the 10 seconds, the test returns FAIL.
The status of the CPE Loopback Jack test appears in the error log as Error Type 3900. Several distinct aux values give information on the status of the test.
Use list measurements ds1 summary to show the length of time the test has been running (Test Duration field) and number of bit errors detected (Loopback/Span Test Bit-Error Count field). If the test pattern is passed through the loopback cleanly, the number of bit errors should be very low. The command also shows the type of loopback/span test executing (Test field), the type of pattern generated for the loopback/span test (Pattern field), and whether the pattern (3-in-24 Pattern) is synchronized (Synchronized field).
Use test ds1-loop location end-loopback/span-test to end the test.
Use release board location to restore each trunk or port on the DS1 Interface board to the in-service state.
This test is run on the following maintenance object:
