Dell PowerConnect 5548 User Guide - Page 122

Time Range Time ranges can be defined and associated with an QoS ACL, so that it is applied only during that time range. There are two types of time ranges: • Absolute -This type of time range begins on a specific date or immediately and ends on a specific date or extends infinitely. It is created in the Time Range pages. A recurring element can be added to it. • Recurring - This is a time range element that is added to an absolute range, and begins and ends on a recurring basis. It is defined in the Time Range Recurrence pages. If a time range includes both absolute and recurring ranges, the ACL is activated only if both absolute start time and the recurring time range have been reached. The ACL is deactivated when either of the time ranges is reached. The switch supports a maximum of 10 absolute time ranges. All time specifications are interpreted as local time (Daylight Savings Time does not affect this). To ensure that the time range entries take effect at the desired times, the system 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 network only during business hours, after which they are locked, and access to the rest of the network is blocked. 122 Dell PowerConnect 55xx Systems User Guide