System information

Troubleshooting Hardware
Book Title
3-36
Table 3-10 outlines the possible LightStream 2020 problems and describes solutions to those
problems.
Table 3-10 Hardware: LightStream 2020 Startup Problems and Solutions
Possible Problem Solution
System initialization
problem
Step 1 Make sure power cords and data cables are firmly connected at both
ends.
Step 2 Make sure all cards (front and back of the chassis) are firmly seated
in the midplane and screwed securely to the chassis.
Step 3 Make sure power supplies, blowers, and disk drives are properly
connected and screwed securely to the chassis.
Blower problem If you are experiencing any of the following symptoms, you might need to
replace the blower:
• The temperature on one or more cards is out of the recommended range.
• The system is powered on, but the blower is not turning, is making noise,
or is exhausting air.
• Two minutes after the system is powered on, the blower fails to reduce its
speed in a room temperature environment.
• The system is powered on, but the blower’s green LED is off. The LED
indicates that the blower is turning at a rate of at least 1500 rotations per
minute.
Bulk power tray problems In a system with one power tray, no power will be present if the power tray is
faulty. There might be a problem with the power tray if cycling the system’s
power has no effect.
A system with two power trays can operate normally when only one is
working. If you suspect a problem, use the CLI
1
command show chassis
powersupply. If a status line for an occupied slot says anything other than
Good, check the faulty power tray to see that it is properly connected.
Replace the power tray if necessary.
Switch card problems If you are experiencing any of the following symptoms, you might need to
replace the switch card:
• POST
2
fails (the FLT
3
LED stays lit and POST results indicate a
problem).
• The Switch card fails even when moved to the other slot. (If the card fails
in one slot but operates properly in another, suspect a problem with the
midplane.)
• Diagnostics that loop data through the switch card fail on two or more
function cards.
• The Switch card fails to come up or to select a TCS
4
hub.
• Traffic is not passing through the system, but the line cards and NPs
5
are
operational.
• The system has data transmission problems that do not go away when you
replace the card that appears to be failing or that occur in several cards
simultaneously. (Problems of this type may also indicate a faulty
midplane.)
• The switch card cannot be fully inserted into its slot. This probably
indicates damage to the connectors on either the card or the midplane.
Inspect all the connectors and replace the card or the midplane if you find
damage.