D-Link DFL-2500 User Guide - Page 114
Date & Time
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11 CHAPTER Date & Time Correctly set date and time is of greatest importance for the product to operate properly. For instance, time scheduled policies and auto-update of IDS signatures are two features that require the clock to be correctly set. In addition, log messages are tagged with time stamps in order to point out exactly when a specific event did occur. Not only does this assume a working clock, but also that the clock is being synchronized with other devices in the network. To maintain current date and time, the product makes use of a built-in real-time clock. The clock is also equipped with a backup battery to ensure operation even if the product should have lost its power. In addition, the product supports time synchronization protocols in order to automatically adjust the clock based on information from other devices. 95