Slip Alarm Inquiry Test (#144)

Slips occur when transmitter and receiver are not running at precisely the same clock rate. The DS1-MM Interface Media Module can detect both positive and negative slips on the DS1 facility. The Slip Alarm Inquiry Test is used to acquire the total number of slips that have occurred on a DS1 link.

When the DS1-MM Interface Media Module detects a slip condition, the Media Module increments the on-board slip counter by one. A SLIP-COUNT message is spontaneously sent to the system software after the counter reaches a threshold (for example, 88). When the maintenance software receives the SLIP-COUNT message, the Slip Alarm Inquiry Test is initiated to query the slip counters on a DS1-MM Interface Media Module and total the slip counts in the maintenance software.

If the count of slips is over the threshold, a Minor alarm is raised against the DS1-MM Interface Media Module. All trunks or ports of the DS1-MM Interface Media Module remain in the in-service state.

Table 71. TEST #144 Slip Alarm Inquiry Test �
Error Code	Test Result	Description/ Recommendation
	ABORT	Internal system error Retry the command at 1-minute intervals a maximum of 5 times.
2000	ABORT	Response to the test was not received within the allowable time period. This may be due to hyperactivity. Error Type 1538 in the error log indicates hyperactivity. The hyperactive Media Module is out of service and one or more of the following symptoms may be exhibited. The DS1-MM tests (such as Test #138 and Test #139) are aborting with error code 2000. The tests run on the ports of this Media Module are returning a no board result. 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 Media Module is isolated from the system, and all of the trunks for this Media Module are placed into the out of service state. The system will try to restore the Media Module within 15 minutes. When no faults are detected for 15 minutes, the DS1-MM interface Media Module is restored to normal operation. All of the trunks for the DS1-MM interface Media Module are then returned to the in service state. Hyperactivity is often caused by the associated facility. In such a 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. If the facility is OK and the error occurs again after 15 minutes, replace the Media Module.
2100	ABORT	Could not allocate the necessary system resources to run this test. Retry the command at 1-minute intervals for a maximum of 5 times.
1 to 88	FAIL	The test failed because the DS1-MM interface Media Module and the remote DS1 endpoint are not synchronized to the same clock rate. The DS1-MM interface Media Module detected a slip alarm. The error code equals the number of slips detected by the DS1-MM interface Media Module since the last slip alarm inquiry test. If the DS1-MM connects to a T1 network facility or to another switch, do the following: Retry the command at 1-minute intervals for a maximum of 5 times. For a DS1 interface Media Module, enter the list measurement ds1-log GGGVS command to read the error seconds measurement. Verify that both endpoints of the DS1 link are administered using the same signaling mode, framing mode, and line coding. Contact T1 Network Service or the technician at the remote switch to diagnose the remote DS1 endpoint. Check the physical connectivity of the DS1-MM interface Media Modules and the cable. Replace the local DS1-MM interface Media Module, and repeat the test.
1 to 88 (cont.)	FAIL (cont'd.)	If the DS1-MM connects to a line-side terminating device (for example, a PRI terminal adapter), do the following: Retry the command at 1-minute intervals for a maximum of 5 times. Enter the list measurement ds1-log GGGVS command to read the error seconds measurement. Verify that the switch DS1 and the line-side terminating device are administered using the same signaling mode, framing mode, and line coding. Investigate the maintenance status of the line-side terminating device. Refer to the 'Line-Side Terminating Device Operating Manual' for information. Contact the vendor of the line-side terminating device to diagnose the equipment. Check the physical connection of the DS1-MM interface Media Module to the terminating device, and check the premise distribution system (or the intra-premise wiring) for physical connection failures. Replace the local DS1-MM interface Media Module and repeat the test.
	PASS	No Slip alarm is detected on the DS1-MM Interface Media Module.
Any	NO BOARD	The test could not relate the internal ID to the port (no board). This could be due to incorrect translations, no board is inserted, an incorrect board is inserted, or an insane board is inserted. Ensure that the board translations are correct. Execute the add ds1 GGGVS command to administer the DS1-MM interface if it is not already administered. If the board was already administered correctly, check the error log to determine whether the board is hyperactive. If this is the case, the board is shut down. Reseating the board will re-initialize the board. If the board was found to be correctly inserted in step 1, then issue the busyout board command. Issue the reset board command. Issue the release busy board command. Issue the test board long command. This should re-establish the linkage between the internal ID and the port.