Network Related Camera Parameters and Managing Bandwidth AW00118303000
42 Basler racer GigE
Step 3 - Set the Bandwidth Reserve parameter for each camera.
The Bandwidth Reserve parameter setting for a camera determines how much of the bandwidth
assigned to that camera will be reserved for lost packet resends and for asynchronous traffic such
as commands sent to the camera. If you are operating the camera in a relatively EMI free
environment, you may find that a bandwidth reserve of 2% or 3% is adequate. If you are operating
in an extremely noisy environment, you may find that a reserve of 8% or 10% is more appropriate.
Step 4 - Calculate the "data bandwidth needed" by each camera.
The objective of this step is to determine how much bandwidth (in Byte/s) each camera needs to
transmit the frame data that it generates. The amount of data bandwidth a camera needs is the
product of several factors: the amount of image data included in each frame, the amount of chunk
data being added to each frame, the "packet overhead" such as packet leaders and trailers, and the
number of frames the camera is acquiring each second.
For each camera, you can use the two formulas below to calculate the data bandwidth needed. To
use the formulas, you will need to know the current value of the Payload Size parameter and the
Packet Size parameter for each camera. You will also need to know the frame rate (in frames/s) at
which each camera will operate.
Data Bandwidth Needed = Bytes/Frame x Frames/s
Where:
Packet Overhead = 72 (for a GigE network)
78 (for a 100 MBit/s network)
Leader Size = Packet Overhead + 36 (if chunk mode is not active)
Packet Overhead + 12 (if chunk mode is 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
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