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Design Guide
Time Synchronization
Maintaining internal clocks that are synchronized to a reliable time source is critical in a
surveillance environment, where video streams need to be retrieved from a specific date and time
for review. The matrix switch and the ISPs should be synchronized to display the same date and
time.
The Stream Manager software that runs on all Cisco Video Surveillance devices can synchronize to
the time that is provided by an ISP. In a typical video surveillance solution, one ISP is configured as
the time master. This ISP uses multicast updates to synchronize the time on all other devices,
including hybrid decoders and the Cisco Stream Manager Client Viewing Module application.
The time master ISP may rely on external devices, such as a matrix switch or devices that run the
Network Time Protocol (NTP) to synchronize its clock.
Figure 28 shows a deployment in which a matrix switch is the time source for the time master ISP.
The time master ISP receives the current time from the matrix switch and propagates it to other
Stream Manager devices. Typically, a serial cable is required to provide clock synchronization.
Note:
Only one ISP should be configured as the time master for the environment.
Figure 28.
Matrix Switch Clock
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