Inter Packet Delay - Smartek Vision Giganetix GC Series User Manual

5.1.2 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 104. 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 105 illustrates a well configured Inter Packet Delay to prevent
collisions.
Packet n
Camera 1
Camera 2
Packets sending flow
Packet 3
Packet 3
Figure 104: Packet flow while not using inter packet delay
Packets sending flow
Delay
Each camera has dedicated time slot
Delay Packet 2
Figure 105: Packet flow while using inter packet delay
5 Image Transmission over Gigabit Ethernet
Packets receiving flow
Packet 2
Packet 1
Packet 1
Packet 2
Packets receiving flow
Packet 2
Packet 1
Delay
133
Collision
Packet 1
SMARTEK Vision Giganetix User Manual Version 2.1.4