Modem Cables
Different external serial modems use an assortment of different types of cables. Make sure the cable is actually a modem cable; other cables might fit, but that doesn’t mean they’ll work. Also try testing the cable in a cable tester. With USB cables, it is often easy to swap with a known good cable.
For information on troubleshooting network connections, see “Troubleshooting Internet Connections.”
Cable and DSL Modems
Cable and DSL modems are external devices used to connect computers to a broadband (high-speed) Internet connection. DSL models connect to the telephone line without a DSL filter. A DSL filter is a device that blocks the DSL signal from interfering with regular telephone conversations; these are usually provided by the DSL provider. DSL modems are connected to the computer either through a USB cable or an Ethernet network cable. Cable modems are similar to DSL modems, but they connect to a television cable instead of a telephone line.
Modem/Sound Card Combinations
No longer manufactured, modem/sound card combinations are very difficult to get drivers for. The best way to deal with failed modem/sound card combos is to replace it with individual components. If you have only one free slot, you can probably replace the modem with an external modem.
By : Book-PC Repair and Maintenance: A Practical Guide
