User Manual

LEDs
M40 Internet Router Hardware Guide
192
LEDs
The LEDs described in the following sections indicate the basic status of hardware
components:
 LEDs on the Craft Interface on page 192
 LEDs on Hardware Components on page 192
LEDs on the Craft Interface
The craft interface hosts LEDs and an LCD that provide status and troubleshooting
information at a glance. It is located on the front of the chassis below the FPC card cage (see
Figure 1). The LEDs on the craft interface include the following:
 Alarm—The circular red alarm LED at the left of the craft interface indicates a critical
condition that can result in a system shutdown. The triangular yellow alarm next to it
indicates a less severe condition that requires monitoring or maintenance. Both alarms
can occur simultaneously. When an alarm LED is lit, the LCD describes the cause of the
alarm. For more information about the alarm LEDs, see “Alarm Relay Contacts, LEDs,
and Cutoff Button” on page 18. For more information about the causes of alarms, see
“Hardware and Interface Alarm Messages” on page 192.
 FPC—For each of the eight FPC slots in the router, there are two LEDs and an offline
button located on the craft interface directly below the slot. The green LED labeled
OK
and red LED labeled
FAIL indicate FPC status. For more information, see “FPC LEDs and
Offline Button” on page 18.
 Routing Engine— LEDs at the right side of the craft interface indicate the status of the
Routing Engine—a green one labeled
OK and a red one labeled FAIL. For more
information, see “Routing Engine LEDs and Interface Ports” on page 19.
LEDs on Hardware Components
LEDs on the faceplates of many hardware components report component status:
 PIC—Most PICs have an LED labeled
STATUS on the PIC faceplate. Some PICs have
additional LEDs, often one per port. The meaning of the LED states differs for various
PICs. For more information, see the M20 and M40 Internet Routers PIC Guide.
 Power supply—A red
FAIL LED and a green OK LED are located on each power supply
faceplate and indicate the status of the power supply. See “Power Supply LEDs” on
page 22.
 SCB—Four LEDs on the faceplate of the SCB indicate its status. See “SCB Components”
on page 13.
Hardware and Interface Alarm Messages
When the Routing Engine detects an alarm condition, it lights the red or yellow alarm LED on
the craft interface as appropriate, trips the corresponding alarm relay contact on the craft
interface, and reports the cause of the alarm in the craft interface LCD. To view a more
detailed description of the alarm cause, issue the
show chassis alarms CLI command: