A Procedure For Managing Bandwidth - Basler Pioneer User Manual

transmission rate will be. After you have adjusted the Inter-packet Delay parameter on each
camera, you can check the sum of the Bandwidth Assigned parameter values and see if the sum is
now less than 125 MByte/s.
7.2.1

A Procedure for Managing Bandwidth

In theory, managing bandwidth sharing among several cameras is as easy as adjusting the inter-
packet delay. In practice, it is a bit more complicated because you must consider several factors
when managing bandwidth. The procedure below outlines a structured approach to managing
bandwidth for several cameras.
The objectives of the procedure are:
To optimize network performance.
To determine the bandwidth needed by each camera for image data transmission.
To determine the bandwidth actually assigned to each camera for image data transmission.
For each camera, to make sure that the actual bandwidth assigned for image data
transmission matches the bandwidth needed.
To make sure that the total bandwidth assigned to all cameras does not exceed the network's
bandwidth capacity.
To make adjustments if the bandwidth capacity is exceeded.
Step 1 - Set the Packet Size parameter on each camera as large as possible.
Using the largest possible packet size has two advantages, it increases the efficiency of network
transmissions between the camera and the PC and it reduces the time required by the PC to
process incoming packets. The largest packet size setting that you can use with your camera is
determined by the largest packet size that can be handled by your network. The size of the packets
that can be handled by the network depends on the capabilities and settings of the network adapter
you are using and on capabilities of the network switch you are using.
Start by checking the documentation for your adapter to determine the maximum packet size
(sometimes called "frame" size) that the adapter can handle. Many adapters can handle what is
known as "jumbo packets" or "jumbo frames". These are packets with a 16 kB size. Once you have
determined the maximum size packets the adapter can handle, make sure that the adapter is set
to use the maximum packet size.
Next, check the documentation for your network switch and determine the maximum packet size
that it can handle. If there are any settings available for the switch, make sure that the switch is set
for the largest packet size possible.
Now that you have set the adapter and switch, you can determine the largest packet size the
network can handle. The device with the smallest maximum packet size determines the maximum
allowed packet size for the network. For example, if the adapter can handle 16 kB packets and the
switch can handle 8 kB packets, then the maximum for the network is 8 kB packets.
Once you have determined the maximum packet size for your network, set the value of the Packet
Size parameter on each camera to this value.
Basler pioneer
Network Related Camera Parameters and Managing Bandwidth
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