Cause
Error type 1538 in the error log indicates hyperactivity. The hyperactive DS1 board is out of service and one or more of the following symptoms may be exhibited.
The DS1 board tests such as test 138 and test 139 abort with error code 2000.
The tests run on the ports are returning NO BOARD.
A busyout or a release command has no affect on the test results.
A list config command shows that the media module and the ports are properly installed.
When hyperactivity occurs, the DS1 board is isolated from the system, and all of its trunks are placed into the out-of-service state. The system will try to restore the DS1 board within 15 minutes. When no faults are detected for 15 minutes, the DS1 board is restored to normal operation and every DS1 interface trunk is returned to the in-service state.
Hyperactivity is often caused by the associated facility. In this case, faults such as slips, misframes, or blue alarms would be entered in the error log. In addition, many hardware errors would be logged against the associated trunk circuits.
