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Figure 17.
Failover with two ISPs
The following events take place if ISP_2 fails:
1.
The Administration and Monitoring with Failover Module determines that ISP_2 has failed
because the module has not received replies after three times the period of the configured
refresh interval.
2.
The Administration and Monitoring with Failover Module sends a discovery request for
available failover ISPs. ISP_3 and ISP_4 respond and specify the number of free channels for
failover recording.
3.
The Administration and Monitoring with Failover Module notifies the first available failover ISP
(which could be ISP_3 or ISP_4) of the port on which to begin recording. Assuming that ISP_3
is first:
a.
The Administration and Monitoring with Failover Module informs ISP_3 which video
stream to begin recording. Through the serial cable between the matrix switch and ISP_3,
ISP_3 instructs the matrix switch to redirect video streams to the first available output port that
is reserved for failover.
b.
The Administration and Monitoring with Failover Module waits for three seconds, then
informs ISP_4 which port to begin recording. Because ISP_4 does not have a serial cable that
connects to the matrix switch, ISP_4 requests that ISP_3 instruct the matrix switch to redirect
the next video stream to the next available output port.
1.
The Administration and Monitoring with Failover Module continues to assign failover ports in
sequence until the failover ISPs report that there are no free channels available.
2.
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 allow video to be
retrieved from either ISP_3 or ISP4.
Design Guide
3-6
Page-3-6
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