Point Grey Flea3 GigE Technical Reference
2 Flea3 GigE Installation
If the packet size and packet delay combination exceeds the available bandwidth, frames will be
dropped.
To calculate your bandwidth requirements:
Determine your required resolution, frame rate, and pixel format (bytes per pixel)
(Height x Width x Frame Rate x Bytes per Pixel)/1000000 = Bandwidth in MB
For example, for an image that is VGA, 82 FPS, Mono8:
640 (H) x 480 (W) x 82 (FPS) x 1 (BPP) = ~25 MB
Once you have calculated your required bandwidth, you can allocate an amount to each camera by adjusting the packet
size and packet delay. Allocating a specific amount to each camera helps to avoid dropped packets due to a data burst.
You would do this in a set up with multiple cameras, or in a situation where the system bandwidth might be limited or
shared due to hardware architecture.
Here are some packet size/packet delay combinations you can use with any image size, pixel format combination. Frame
rate will be limited depending on total bandwidth.
To allocate 25 MB
~20% of bandwidth
To allocate 55 MB
~45% of bandwidth
Packet Size = 9000
Packet Delay = 5900
Packet Size = 9000
Packet Delay = 1800
Packet Size = 1400
Packet Delay = 900
Packet Size = 1400
Packet Delay = 255
Bandwidth Requirements for Multiple Cameras
Multiple cameras can be set up in two ways: 1) Each camera is connected directly to a single Ethernet port; or, 2)
multiple cameras are connected to a single port through an Ethernet switch.
If using the first method, each camera has the full bandwidth allocation available to it. If using the second method, the
combination of all cameras on a switch cannot exceed the available bandwidth.
Title
Article
Setting Up Multiple GigE Cameras
Knowledge Base Article 390
Related Knowledge Base Articles
2.4.4
Configuring Other Network Settings
The following GigE Vision bootstrap registers can be used for configuring the camera on the network. All registers are
implemented according to the GigE Vision standard. A listing of all network-related bootstrap registers supported on the
camera is provided in
GigE Vision Bootstrap Registers
.
2.4.4.1
Stream Channel Destination Address
The stream channel destination address (SCDA) register is used to specify the streaming destination IP address. The
default SCDA is the IP address of the network or computer to which the camera is connected. It can be set within a
Revised 10/29/2013
Copyright ©2010-2013 Point Grey Research Inc.
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