Inter-Packet Delay - Smartek UCC User Manual

5.6.2 Inter-Packet Delay

The Inter Packet Delay is usually applied when multiple cameras are connected to one PC over the same
Network Interface Card (NIC). It enables the user to create a pause between consecutive packets which
reduces the amount of effective load and creates timeslots for packets from other devices on the connection.
Packet n
Camera 1
Camera 2
Packet 3 Packet n
If the Inter Packed Delay is not used, excessive collision between packets may occur which results in
data loss, like illustrated in Figure 49. Packets from two cameras are sent to PC over the same network
connection. Without any Inter Packet Delay set, collision between packets from different cameras may
occur in case of insufficient bandwidth. Figure 50 illustrates a well configured Inter Packet Delay to prevent
collisions.
Packet n
Camera 1
Camera 2
Packets sending flow
Packet 3
Packet 3
Figure 49: Packet flow while not using inter packet delay
Packets sending flow
Delay
Each camera has dedicated time slot
Delay Packet 2
Figure 50: Packet flow while using inter packet delay
Packets receiving flow
Packet 2
Packet 1
Packet 1
Packet 2
Packets receiving flow
Packet 2
Packet 1
Delay
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User Manual - twentynine
Collision
Packet 1
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