Red Alarm Inquiry Test (#140)

A MG-DS1 Interface Media Module raises a Red alarm when the framing pattern of the incoming DS1 bit stream has been lost. The Red Alarm Inquiry Test checks the framing status of a MG-DS1 Interface Media Module. A MG-DS1 Interface Media Module takes 3 seconds to recognize and report a Red alarm and 10 seconds to recognize and report the resolution of a Red alarm.

When the MG-DS1 Interface Media Module detects a Red alarm, the Media Module transmits a Yellow alarm to the remote DS1 endpoint and sends a RED ALARM message to the maintenance software. After the Red alarm is confirmed, the maintenance software places all trunks or ports of the Media Module into the out-of-service state. The inquiry test runs every 10 minutes until the Red alarm is cleared.

When the Red alarm is cleared, the MG-DS1 Interface Media Module stops transmitting the Yellow alarm to the remote DS1 endpoint. The maintenance software restores all trunks or ports of the MG-DS1 Interface Media Module to the service state it was in before the Red alarm occurred.

Loss of Multiframe Alarm

If the MG-DS1 Interface Media Module is administered using DMI-BOS signaling, the MG-DS1 Interface Media Module raises a Loss of Multiframe Alarm (LMA) when it cannot interpret the incoming signaling bits to synchronize to the multiframe pattern received in the 24th channel. Once the MG-DS1 Interface Media Module detects an LMA, the Media Module transmits a Remote Multiframe Alarm (RMA) to the remote DS1 endpoint. Maintenance software handles both Red alarm and LMA alarm(s) using the same mechanism.

Table 154. TEST #140 Red 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 MG-DS1 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 MG-DS1 interface Media Module is restored to normal operation. All of the trunks for the MG-DS1 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.
	FAIL	The MG-DS1 interface Media Module detected a red alarm. An out of frame condition occurred on the MG-DS1 interface Media Module. The MG-DS1 interface Media Module will transmit a yellow alarm to the remote MG-DS1 endpoint until the red alarm is retired. If the MG-DS1 connects to a T1 network facility or to another switch, do the following. 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 a technician at the far-end switch to diagnose the remote DS1 endpoint. Check the physical connectivity of the MG-DS1 packs and of the cable. Replace the local MG-DS1 interface Media Module, and repeat the test. If the MG-DS1 connects to a line-side terminating device (for example, a PRI terminal adapter), do the following. 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 MG-DS1 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 MG-DS1 interface Media Module and repeat the test.
1	FAIL	The test failed. The MG-DS1 interface Media Module detected a loss of multiframe alarm (LMA). An out of frame condition occurred on the MG-DS1 interface Media Module. The MG-DS1 interface Media Module will transmit a remote multiframe alarm (RMA) to the remote MG-DS1 endpoint until the LMA is retired. If the MG-DS1 connects to a T1 network facility or to another switch, do the following: 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 a technician at the far-end switch to diagnose the remote DS1 endpoint. Check the physical connectivity of the MG-DS1 packs and of the cable. Replace the local MG-DS1 interface Media Module, and repeat the test. If the MG-DS1 connects to a line-side terminating device (for example, a PRI terminal adapter), do the following. 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 MG-DS1 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 MG-DS1 interface Media Module and repeat the test.
	PASS	No Red alarm is detected on the MG-DS1 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 MG-DS1 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.