Hardware Troubleshooting 5-11
Troubleshooting the Processor Subsystems
The processor subsystem consists of the I/O controller card, network processor card, and all port
adapters in the router shelf, and the dial shelf controller card, modem cards, and trunk cards in the
dial shelf. The following sections contain specific troubleshooting information for each of these
components.
The router shelf I/O controller card and network processor card are required system components.
The system cannot operate unless the I/O controller card and network processor card are insta lled
properly; however, the system can operate withou t any port adapte rs ins talle d as long as none are in
partial contact with the midplane pins. A port adapter that is partially connected to the midplane
causes the router shelf t o c ras h or to hang. Therefore, f irs t ensu r e t hat the I/ O con t rol le r ca rd an d t he
network processor card are installed properly and that the system software has initialized
successfully. Then, if necessary , you can troub leshoot i ndi vidual r outer shelf po rt adapt ers, dial shelf
controller cards, mo dem cards, or trunk ca rds.
Troubleshooting the Router Shelf Processor Subsystem
The following sections describe troubleshooting procedures for the router shelf I/O controller card,
the network processor card, and the port adapters.
Troubleshooting the I/O Controller Card
These procedures assume that the I/O controller card, netw ork process or card , and router s helf it self
are in the original factory configuration and that you have not made changes to your configuration
file.
If the I/O controller card LEDs do not light as expected (refer to the section “Identifying Startup
Problems” in this chapter), check the following items to help isolate the problem:
•Is the I/O power OK LED on?
—If yes, the router has booted successfully.
—If this LED remains OFF at system startup, either there is a problem with the power supply
(it is damaged or not connected to th e route r midplane ), or the netwo rk p roces sor c ard or I/O
controller card is not connected to the router midplane.
•Do all I/O controller card LEDs remain off when the system powers ON?
—If the LEDs remain off, first refer to the sections “Troubleshooting the Power Subsystems”
and “Troubleshooting the Cooling Subsystems” in this chapter to ensure th a t both the fans
and the power supply are functioning properly.
—If the power supply and fans appear op erati onal b ut no ne of the I/O control ler c ard LEDs are
on, ensure that an improperly connected I/O controller card or port adapter has not hung the
system. Tighten all captive installation screws, and then restart the system.
—With the power supply powered OFF, reseat the I/O controller card in i ts slot and restart the
router.
•Is the I/O controller card enabled LED on?
—If yes, the system software has initialized su ccessfully and the system is operational.
—If the enabled LED remains off, the system detected a processor hardw are fail ure. (This LED
should be on in normal operation.) Proceed to the section “Troubleshooting the Network
Processor Card” to continue troubleshooting.