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8-2
Cisco MGX 8220 Installation and Configuration
Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
Chapter
Troubleshooting the MGX 8220 Shelf
General Troubleshooting Procedures
The MGX 8220 shelf run self-tests continuously to ensure proper function. When the unit finds an error
condition that affects its operation, it downs the card or line that is affected. If it is caused by a card
failure and there is a redundant card, the failed card is downed and the standby card becomes the active
card.
The fail lights on the cards indicate that the system has found these cards defective in some mode, and
now considers them as failed cards. See Table 8-1 to find the cause and obtain information on replacing
the failed component.
Table 8-1 Troubleshooting the MGX 8220 Shelf Node
Symptom Probable Cause Remedy
No front panel LEDs
are lighted.
Circuit breakers on the MGX 8220
shelf power entry modules
switched off.
Press the black button on the power entry modules to switch
on the circuit breakers. If a problem persists, pull all cards and
power supplies out to see if a shorted card or supply exists.
MGX 8220 shelf power cord plug
disconnected from AC supply.
Reconnect power cord.
Card front panel FAIL
LED lit.
Card failed self-test. Check status of card at control console entering the dspcds
screen. If the alarm is confirmed, try the card reset (resetcd
command). Finally, remove and replace the card.
Card STBY LED on. Card is off-line. Not a problem as long as a primary card is active.
BNM major or minor
LED on.
Service-affecting (major) or
nonservice affecting (minor)
system fault.
Check event log to identify problem reported.
Network trunk failed. Observe port LEDs on each BNM.
Use control console dspln to locate failure.
Internal temperature is higher than
normal resulting from blocked air
flow or defective fan.
Check front of cooling assembly for freedom of air flow.
Replace the assembly that might have failed or slowed. Check
free air flow in plenum chamber, remove blockage if
necessary.
ASM HIST LED lit. If no other alarm indications, a
fault occurred in the past but has
been cleared.
Press ASM HIST (history clear) button. Check NMS event log
to determine cause.
BNM PORT LED is
red.
Trunk is in local or remote alarm. Use short BNM loopback cable line module connector for
local test of trunk. Loop trunk at DSX-3 crossconnect to check
cable.
ASC FAIL LED
flashing.
Downloading system software or
configuration data.
Wait for download to complete.