Specifications

524-Port 10/100 Ethernet Switch Installation
Troubleshooting
How to Resolve Problems
This chapter describes common problems that may occur when using the switch and their possible
solutions.
First, use the information in this chapter to attempt to resolve a problem. If this information does not
resolve the problem, contact APC Worldwide Customer Support using the numbers listed on the back
cover of this guide.
Specific Problems and Their Solutions
Diagnosing LED Indicator
If the LNK LED does not illuminate after connection, check the following:
• Verify that the switch and any devices attached to it are turned on.
• Be sure the connecting cable is plugged into both the switch and its corresponding device.
• Verify that the proper cable type is used and its length does not exceed specified limits.
See “Connecting the switch” on page 4.
Power
If the power indicator on the front panel of the switch does not turn on when the power cord is plugged
in, the power outlet or power cord may be defective.
If the switch loses power after running for a while, check for loose power connections, or power
fluctuations at the power outlet.
Incorrect connections
The switch can auto-detect whether a device is connected with a straight-through or crossover cable. If
the RJ-45 connector pins are not properly configured, the link will fail.
Faulty or loose cables. Look for loose or faulty connections. Make sure the connections are snug. If
that does not correct the problem, try a different cable of the same category.
Non-standard cables. Check that you are using the correct cables.
See “Connecting the switch” on page 4.
Improper network topologies. Make sure that you are using a valid network topology. Too many
hubs or repeaters between the connected computers in the network may increase the number of packet
collisions or cause other network problems. Remove unnecessary hubs from the network.