Installation Manual

Table 3-2. LED Error Patterns During Operation
Operational fault LED patterns Diagnostic Tips
Power Self-test Fault Net Fail
Unlit ***
Check power cord and power source. If they are OK, replace
the router.
Lit Unlit Lit All
Unlit
Software failure. Press Reset button or enter NCL Boot
command if router is not set to reboot automati cally. Check
console after you boot for the crash message. (You can re-
examine the crash messages any time with NCL’s Crash
command.)
Lit * Lit All Lit While Reset button is pressed or when power is applied, this
pattern is normal. If Reset is not pressed when you see this
pattern, go to the next row.
Lit Unlit Lit Any Ports Lit
Port failure. Cycle power or press Reset button to run self-
test. Interpret results using table 3-1.
Lit Unlit Unlit Any WAN
Lit
For point-to-point non-X.25 circuits, if Remote Signal & Sense
is enabled, then the WAN port is not hearing properly
addressed Breath-of-Life packets from the remote device.
This may be due to faulty or disconnected network hardware
or improper configuration. If nothing is to be connected to
this port, set Auto Enable to No for this circuit in the
Configuration Editor or delete the configuration for this port.
Lit Unlit Unlit Ethernet
(802.3) LAN
Lit
The driver is unable to send data. Data is sent by a protocol
or when XCVR Signal Polling is enabled on this LAN port. The
failure may be due to faulty or disconnected network hard-
ware, excessive collisions, or excessive deferrals. If nothing
is to be connected to this port, set Auto Enable to No for this
circuit in the Configuration Editor.
Lit Unlit Unlit Token Ring
(802.5) LAN
Lit
Ring error occured. Either the cable is not properly attached
or the wrong ring interface rate is active. (Options are 4
Mbit/s, 16 Mbit/s, or 16 Mbit/s ETR). Check both end
connections of the cable and then use the Quick
Configuration utility to verify that you are using the proper
rate. (The Ring Interface parameter is listed in the ‘‘Port Conf’’
column of the ‘‘Token Ring’’ row of Quick configuration
screens in routers having a token ring port.)
*
This LED is not important for the diagnosis.
Troubleshooting
3
Troubleshooting
Interpreting LED Error Patterns
3-5