Milestone XProtect Advanced VMS 2014 User Manual download pdf (Page 48)

Milestone XProtect

Advanced

VMS 2014

Administrator's Manual

www.milestonesys.com

First time use

The UPS works as a battery-driven secondary power source, providing the necessary power for

saving open files and safely powering down your system in the event of power irregularities. UPSs

vary in sophistication, but many UPSs include software for automatically saving open files, for alerting

system administrators, etc.

Selecting the right type of UPS for your organization's environment is an individual process. When you

assess your needs, however, bear in mind the amount of runtime you require the UPS to be able to

provide if the power fails. Saving open files and shutting down an operating system properly may take

several minutes.

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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Milestone XProtect Advanced VMS 2014 User Manual Page 48