Smartek UCC User Manual page 75

Example 1
Figure 47 illustrates the packet resend mechanism with the following assumptions:
Packet 1007 is missing within the stream of packets and has not been recovered
MaxResendPacketRetry parameter is set to 2
(1)
999
Figure 47: Packet Resend example when MaxResendPacketRetry value has exceeded
Corresponding to Figure 47, the workflow of the Packet Resent mechanism would look like described below:
1. Stream of packets. Gray indicates packets that have been checked by the driver, white packets have
not yet been checked.
2. As packet 1008 is received, packet 1007 is detected as missing.
3. Interval defined by the PacketResendTimeout parameter.
4. The PacketResendTimeout is expired, the first resend request for packet 1007 is sent to the camera.
The camera does not respond with a resend.
5. Interval defined by the PacketResendResponseTimeout parameter.
6. The PacketResendResponseTimeout expires and second resend request for packet 1007 is sent to
the camera. The camera does not respond with a resend.
7. Interval defined by the PacketResendResponseTimeout parameter.
8. As the maximum number of resend requests has been sent ( MaxResendPacketRetry ) and the last
PacketResendResponseTimeout has expired, packet 1007 is now considered as lost.
If a group of packets is missing (for example 1000, 1001, 1002 and 1003 ), only one resend request will be
sent covering all connected packets.
1000 1001 1002 1003 1004 1005 1006 1008
(2) (4) (6)
1009 1010 1011 1012 1013 1014 1015
(3) (5)
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User Manual - twentynine
(8)
1016 1017 1018 1019 1020
(7)
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