122 Dell PowerConnect 55xx Systems User GuideTime RangeTime ranges can be defined and associated with an QoS ACL, so that it isapplied only during that time range.There are two types of time ranges:• Absolute —This type of time range begins on a specific date orimmediately and ends on a specific date or extends infinitely. It is createdin the Time Range pages. A recurring element can be added to it.• Recurring — This is a time range element that is added to an absoluterange, and begins and ends on a recurring basis. It is defined in the TimeRange Recurrence pages.If a time range includes both absolute and recurring ranges, the ACL isactivated only if both absolute start time and the recurring time range havebeen reached. The ACL is deactivated when either of the time ranges isreached.The switch supports a maximum of 10 absolute time ranges.All time specifications are interpreted as local time (Daylight Savings Timedoes not affect this).To ensure that the time range entries take effect at the desired times, thesystem time must be set. For more information on setting the system time,see "Time Synchronization" on page 162.A possible use for this feature is to limit access of computers to the networkonly during business hours, after which they are locked, and access to the restof the network is blocked.
