Troubleshooting guide

Diagnosing Problems
219
Table 76 shows the meaning of the indicators. If the primary controller fails and transfers support
for the trunk to the secondary controller, the LEDs on the T1/E1 Combo MMC will flash red and
green.
Table 76: Meaning of T1/E1 Combo MMC Indicators (Primary Controller)
Table 77: Meaning of T1/E1 MMC Indicators on Secondary Controller
Indicators Meaning Action
Link is functioning properly. No
alarms present.
None.
Primary controller has failed and
the system has transferred
support for the link to the T1/E1
MMC in the secondary controller.
Investigate reason for failure of
primary controller. See “IP Device
Resiliency” on page 153.
Loss of T1/E1 signal. Check link connection.
No signal is being received from
the PSTN.
Check link with analyzer.
Signal from the PSTN is faulty. Check link with analyzer.
• Not programmed. Link
descriptor not assigned.
• System is out of service
• Faulty T1/E1 MMC
Assign link descriptor. Refer to
System Tool Administration online
help for programming instructions.
Indicators Meaning Action
If the primary controller is supporting
the link, this alarm state on the
secondary controller indicates
normal operation. Because the link is
not connected to this T1/E1 MMC,
the alarm is not reported in the
system logs of the secondary
system.
None.
Primary controller has failed and
support for the link has failed over to
the T1/E1 MMC in this secondary
controller. However, the signal from
the PSTN is faulty.
Investigate reason for failure of
primary controller. See “IP
Device Resiliency” on page 153.
Check the link from the PSTN
with analyzer.
ALARM - Off
STATUS - Green
ALARM - Flashing Red
STATUS - Flashing Green
ALARM - Red
STATUS - Off
ALARM - Yellow
STATUS - Off
ALARM - Yellow
STATUS - Green
ALARM - Off
STATUS - Off
ALARM - Red
STATUS - Off
ALARM - Yellow
STATUS - Green