This test is destructive.
For documentation purposes, the term DS1 applies to the DS1 Interface media modules.
The One-Way Span test allows 1-way span testing to and from remote test equipment or another Communication Manager solution. This tests all circuitry and facilities from the local DS1 board to the remote test equipment or other Communication Manager solution.
The test is highly destructive and can only be initiated by entering the command test ds1-loop location one-way-span-test-begin.
Enter busyout board to busy out all trunks or ports on the DS1 Interface media module before running the One-Way Span test.
The One-Way Span test has the DS1 Interface circuit pack transmit a framed 3-in-24 test pattern and attempts to receive and verify the pattern. If the DS1 board receives a framed 3-in-24 test pattern sent from another Communication Manager system or test equipment at the far end of the DS1, it begins counting bit errors within the received pattern.
Note:
If a DS1 circuit pack and a DS1 Interface media module are connected, the test will fail because the media module does not frame-align its test pattern.
The status of the One-Way Span test appears in the error log as Error Type 3902. Several aux values give information on the status of the test.
Enter list measurements ds1 summary to see 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 sent cleanly over the span from the far end, the number of bit errors should be very low. The Test Duration field is 0 until the test pattern is received from the far end. Upon receiving the test pattern, the board begins calculating the test duration and number of bit errors. 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 (i.e., 3-in-24 Pattern) is synchronized (Synchronized field)
Enter test ds1-loop location end-loopback/span-test or release board to end the test. Enter release board to restore all trunks or ports on the DS1 Interface media module to the in-service state.
