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alternate keyboard that is connected to any ISP on the network could retrieve recorded video.
During a failure, the Stream Manager Client Viewing Module cannot retrieve recorded video from
the failover ISP.
Note:
In a system that is configured with a 20 second refresh rate, typical recovery times are
approximately 75–80 seconds. During this time, video streams from the failed device are lost.
Single Port Failure
The failover solution can also monitor when a single port on an ISP fails or loses video. Such a
situation can occur for several reasons, such as a hardware malfunction or a faulty cable.
When a single port loses video, the following steps take place:
1.
The ISP is still able to communicate on the network, so it reports the port failure event directly
to the Administration and Monitoring with Failover Module, sending a video loss alarm that
specifies the peripheral ID of the failed port. Figure 36 on page 5-14 illustrates this
configuration.
2.
The Administration and Monitoring with Failover Module informs the failover ISP which video
stream needs to be recorded.
3.
The failover ISP notifies the matrix switch (through the serial cable) to redirect video streams to
the first available output port that is reserved for failover.
4.
The redirected video stream is recorded on the failover ISP.
5.
If an operator requests video playback during a failure, the retrieval steps are the same as
Step 1 through Step 6 that accompany Figure 12 on Page 2-8. These steps explain how video
is retrieved from the failover ISP.
Recovering from a Failure
The failover ISP continues to record until the failure is corrected. When a failed device becomes
operational, it begins to record video streams and responds to discovery requests from the
Administration and Monitoring with Failover Module. After receiving these responses for
approximately 10 seconds, the Administration and Monitoring with Failover Module redirects video
streams to the primary ISP.
The failover ISP instructs the matrix switch to stop sending video on the output ports and the
Administration and Monitoring with Failover Module notifies each failover port to stop recording. It
does it in sequence, by notifying one port and waiting for three seconds before notifying the next
port. The primary ISP resumes recording video.
Video streams that were recorded on the failover ISP remain on the failover ISP and are not
transferred to the primary ISP.
Retrieving Video from a Failover ISP
After the primary ISP is restored, video playback or exporting is performed on the primary ISP. To
retrieve video that was recorded during a failure, an operator performs the steps that accompany
Figure 12 on Page 2-8. When doing so, an operator also must specify the start time and date for
the desired video.
As shown in Figure 15, if operators requests to review video streams that fall within the time of the
failure, video is retrieved from the failover ISP. The video can be played until the point where the
Design Guide
3-4
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