TroubleshootingHardware Components
LCD Message CLI Message
interface-name so-x/x/xSEF interface-name so-x/x/x- SONET severely errored
frame
interface-name so-x/x/xUNEQ interface-name so- x/x/x- SONET unequipped

Blown Fuse Indicators

The router uses fuses fromthe Cooper Bussman brand GMT series for the
FPCs, MCSs, PCGs, and SFMs. They are located in a fuse box on the rear
ofthemidplane. Whenthefuseforacomponentblows,thecomponent
stopsfunctioningeventhoughitisinstalledcorrectlyandthepower
supplies are s till providing power to the rou ter.
Figure 107 shows the location in the fuse box of the fuse for each componen t.
The labels shown in the figuredo not appear on the actual fuses (the clear cover
on every fuse reads BUSS GMT-X), but a table on the surfaceof the midplane
below the fuse box displaysthe same information.
Figure 107: Fuse Locations in the Fuse Box
J240
A
B
C
D
J241
ABCD
J244
ABCD
J242
ABCD
J243
ABCD
MCS0 12A
MCS1 12A
SFM0 10A
SFM1 10A
SFM2 10A
FPC4 15A
FPC2 15A
FPC1 15A
FPC0 15A
PCG0
1A
15A
SFM3 10A
SPARE 1A
SPARE 10A
SPARE 12A
SPARE 15A
FPC7 15A
FPC6 15A
FPC5 15A
1238
1A
PCG1
FPC3
When a fuse has blown but the power supplies are still delivering power to router,
the amber LED adjacent to the fuselights. For verticallyoriented fuses (in the
groups labeled J241 through J244in F igure107), the LED is located below the fu se;
for horizontally oriented fuses (in the grou p labeled J240), it is to the left of the fuse.
NOTE: The LEDs are each about 0.1” (2 mm) square. They might be difficult
to see when not lit.
Another indication that a fuse has blown is that the coloredindicator bulb
inside it becomes visible through the clear cover on the fuse. For information
about the indicator bulb color for each fuse type, see Table25.
Overview of TroubleshootingResources 211