Setting Up 21Power surges on telephone lines can damage modems. Dell recommendsthat you disconnect the telephone line from the telephone wall jack duringelectrical storms. Many surge protectors have a telephone jack for modemprotection. See the surge protector documentation for modem connectioninstructions.NOTICE: Network adapter protection is not available on surge protectors.Dell recommends that you disconnect the network cable from the network walljack during electrical storms.Line ConditionersNOTICE: Line conditioners do not protect against power interruptions.Line conditioners are designed to maintain AC voltage at a fairly constantlevel. Line conditioners can cost up to several hundred dollars more thansurge protectors.Uninterruptible Power Supply DevicesNOTICE: Loss of power while data is being saved to the hard drive may resultin data loss or file damage.HINT: To ensuremaximum batteryoperating time, connectonly your computer to aUPS. Connect otherdevices, such as a printer,to a separate power stripthat provides surgeprotection.A UPS protects against power fluctuations and interruptions. UPS devicescontain a battery that provides temporary power to connected devices whenAC power is interrupted. The battery charges while AC power is available.See the UPS manufacturer documentation for information on batteryoperating time and to ensure that the device is approved by UnderwritersLaboratories (UL).