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Where:
Packet Overhead = 72 (for a GigE network)
Leader Size = Packet Overhead + 36 (if chunk mode is not active)
Trailer Size = Packet Overhead + 8
⎡ x ⎤
1
means round up x to the nearest integer
⎡ x ⎤
4
means round up x to the nearest multiple of 4
Step 4 - Calculate "data bandwidth assigned" to each camera.
For each camera, there is a parameter called Bandwidth Assigned. This read only parameter
indicates the total bandwidth that has been assigned to the camera. The Bandwidth Assigned
parameter includes both the bandwidth that can be used for image data transmission plus the
bandwidth that is reserved for packet resents and camera control signals. To determine the "data
bandwidth assigned," you must subtract out the reserve.
You can use the formula below to determine the actual amount of assigned bandwidth that is
available for data transmission. To use the formula, you will need to know the current value of the
Bandwidth Assigned parameter and the Bandwidth reserve parameter for each camera.
Data Bandwidth Assigned
Step 5 - For each camera, compare the data bandwidth needed with the data bandwidth
assigned.
For each camera, you should now compare the data bandwidth assigned to the camera (as
determined in step 4) with the bandwidth needed by the camera (as determined in step 3).
For bandwidth to be used most efficiently, the data bandwidth assigned to a camera should be equal
to or just slightly greater than the data bandwidth needed by the camera. If you find that this is the
situation for all of the cameras on the network, you can go on to step 6 now. If you find a camera
that has much more data bandwidth assigned than it needs, you should make an adjustment.
To lower the amount of data bandwidth assigned, you must adjust a parameter called the Inter-
packet Delay. If you increase the Inter-packet Delay parameter value on a camera, the data
bandwidth assigned to the camera will decrease. So for any camera where you find that the data
bandwidth assigned is much greater then the data bandwidth needed, you should do this:
1. Raise the setting for the Inter-packet delay parameter for the camera.
2. Recalculate the data bandwidth assigned to the camera.
3. Compare the new data bandwidth assigned to the data bandwidth needed.
4. Repeat 1, 2, and 3 until the data bandwidth assigned is equal to or just greater than the data
bandwidth needed.
Basler pioneer
Network Related Camera Parameters and Managing Bandwidth
78 (for a 100 MBit/s network)
Packet Overhead + 12 (if chunk mode is active)
=
Bandwidth Assigned
100 Bandwidth Reserved
–
×
---------------------------------------------------------------------- -
100
95
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