A Procedure For Managing Bandwidth - Basler ace acA640-90gm User Manual

Network Related Camera Parameters and Managing Bandwidth
B.3 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
CPU interrupts to a low value.
If possible, also set the parameter for speed and duplex to auto.
Contact Basler technical support if you need further assistance.
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