Power surges, particularly those caused by nearby lightning strikes, can damage your cable or DSL modem, or even your computer. A surge/lightning suppresser can provide protection, but unfortunately many of the devices sold in retail stores, particularly the less expensive ones, are not terribly effective. Another problem is that they typically aren't designed for the higher speeds of Cable Modems and DSL. If you care about such protection, you may want to consider a higher quality "industrial grade" unit specifically designed for high-speed data; good sources of such products include:
At a minimum, make sure that any point of use surge suppressor is UL 1449 Second Edition listed/recognized at a suppressed voltage rating (SVR) of 330 volts. For endurance, the surge suppressor should also be Classified in Accordance with ANSI/IEEE C62.41-1991, Recommended Practices. UL 1449 listed products are not necessarily classified for endurance.
Telecommunications network suppressor standards
At a minimum, make sure that any point of use surge suppressor is UL 497 listed/recognized.
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