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AW00011916000 Network Related Camera Parameters and Managing Bandwidth
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You can lower the data output rate on a camera by using the Inter-packet Delay parameter. This
parameter adds a delay between the transmission of each packet from the camera and thus slows
the data transmission rate of the camera. The higher the inter-packet delay parameter is set, the
greater the delay between the transmission of each packet will be and the lower the data
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.
5.2.1 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 - Improve the Network Performance.
If you use, as recommended, the Basler performance driver with an Intel PRO network adapter or
a compatible network adapter, the network parameters for the network adapter are automatically
optimized and need not be changed.
If you use the Basler filter driver and have already set network parameters for your network adapter
during the installation of the Basler pylon software, continue with step two. Otherwise, open the
Network Connection Properties
window for your network adapter and check the following network
parameters:

If you use an Intel PRO network adapter: Make sure the Receive Descriptors parameter is set to
its maximum value and the Interrupt Moderation Rate parameter is set to Extreme .
Also make sure the
Speed and Duplex Mode
parameter is set to
Auto Detect
.

If you use a different network adapter, see whether parameters are available that will allow
setting the number of receive descriptors and the number of CPU interrupts. The related
parameter names may differ from the ones used for the Intel PRO adapters. Also, the way of
setting the parameters may be different. You may, e.g., have to use a parameter to set a low
number for the interrupt moderation and then use a different parameter to enable the interrupt
moderation.
If possible, set the number of receive descriptors to a maximum value and set the number of