Link Up For A Short Time And Then Down; Link Goes Down When Idle; Dms Smdi Shutdown Behavior - Northern Telecom DMS-100 Series Manual

Link up for a short time and then down

Verify that the cables are of the type recommended for SMDI links.
Check the connectivity of the related SMDI cable.
Verify that the SMDI links are datafilled correctly. Refer to the DMS
VoiceMail Translation Procedures, 297-7001-310.
Check the status of the links on the terminal display. Then follow the
described steps in the previous section for the type of condition.

Link goes down when idle

Check the connectivity of the related SMDI cable.
If the link bounces up and down when it is idle (that is, every minute), then
suspend the load on the switch side of the SMDI link. Verify that if an MPC
card is being used, then the load should be MPCA33CP or later.
Verify that the correct firmware is being used.
If the terminal display indicates an alarm condition, refer to the section
entitled If the system shows an alarm in this chapter.

DMS SMDI shutdown behavior

If the switch-side SMDI links shutdown, then the InService link on the
DMS VoiceMail side will get an InsrvRedAlarm after about ten seconds. If
the SMDI link on the switch-side does not recover in five minutes then the
InsrvRedAlarm link is deemed to be faulty.
However, if the link is either out-of-service or faulty, the link stays
InsrvRedAlarm. However, if the link remains down for over ten minutes,
DMS VoiceMail resets and re-initializes the onboard modem causing the
modem connection to be dropped (InsrvYelAlarm) and attempts to
re-establish connections.
If redundancy is available, after five minutes a switch link occurs causing
the standby link to take over. Once the standby link takes over and the
switch is down, the link behaves as described above. Once the link on the
switch comes up, the problem should clear itself. Maintenance needs to be
performed on the faulty link if redundancy was equipped.
If the problem is isolated to the SMDI link on the switch-side, disable the
SMDI card on the switch-side (either an MPC or FA card). Find the
location of the card on the DMS shelf and reseat the card. Then enable the
card (that is, download the software to the card again) and enable the link.
DMS VoiceMail Trouble-locating and alarm-clearing procedures SPM 02
Peripherals and links 8-9