Milestone XProtect Essential 2014 Manuel d'utilisateur Page 11

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Milestone XProtect
®
Essential 2014
Administrator's Manual
www.milestonesys.com
11
Before you start
Your organization may also have selected to use any other port numbers, for example if you have
changed the server access (on page 136) port from its default port number (80) to another port
number.
About administrator rights
When you install the surveillance system, it is important that you have administrator rights on the
computer that should run the system. If you only have standard user rights, you cannot configure the
surveillance system.
About daylight saving time
Daylight saving time (DST) is the practice of advancing clocks in order for evenings to have more
daylight and mornings to have less. The use of DST varies between countries/regions.
When you work with a surveillance system, which is inherently time-sensitive, it is important that you
know how the system handles DST.
Spring: Switch from Standard Time to DST
The change from standard time to DST is not much of an issue since you jump one hour forward.
Typically, the clock jumps forward from 02:00 standard time to 03:00 DST, and the day has 23 hours.
In that case, there is no data between 02:00 and 03:00 in the morning since that hour, for that day, did
not exist.
Fall: Switch from DST to Standard Time
When you switch from DST to standard time in the fall, you jump one hour back. Typically, the clock
jumps backward from 02:00 DST to 01:00 standard time, repeating that hour, and the day has 25
hours. In that case, you reach 01:59:59, then immediately revert back to 01:00:00. If the system did
not react, it would essentially re-record that hour, so the first instance of, for example, 01:30 would be
overwritten by the second instance of 01:30.
Because of this, your system forcefully archives the current video in the event that the system time
changes by more than five minutes. The first instance of the 01:00 hour is not viewable directly from
clients. However, the data is recorded and safe, and it can be browsed using the XProtect Smart
Client by opening the archived database directly.
About time servers
Once your system receives images, they are instantly time-stamped. Since cameras are separate
units which may have separate timing devices, camera time and your system time may not correspond
fully. This may occasionally lead to confusion. If your cameras support timestamps, Milestone
recommends that you auto-synchronize camera and system time through a time server for consistent
synchronization.
For information about how to configure a time server, search www.microsoft.com for time server, time
service, or similar.
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