Basler raL2048-48gm User Manual download pdf (Page 49)

AW00118302000 Network Related Camera Parameters and Managing Bandwidth

Basler racer GigE 39

5.2 Managing Bandwidth When Multiple

Cameras Share a Single Network Path

If you are using a single camera on a GigE network, the problem of managing bandwidth is simple.

The network can easily handle the bandwidth needs of a single camera and no intervention is

required. A more complicated situation arises if you have multiple cameras connected to a single

network adapter as shown in Fig. 10.

Fig. 10: Multiple Cameras on a Network

One way to manage the situation where multiple cameras are sharing a single network path is to

make sure that only one of the cameras is acquiring and transmitting frames at any given time. The

data output from a single camera is well within the bandwidth capacity of the single path and you

should have no problem with bandwidth in this case.

If you want to acquire and transmit frames from several cameras simultaneously, however, you

must determine the total data output rate for all the cameras that will be operating simultaneously

and you must make sure that this total does not exceed the bandwidth of the single path (125

MByte/s).

An easy way to make a quick check of the total data output from the cameras that will operate

simultaneously is to read the value of the Bandwidth Assigned parameter for each camera. This

parameter indicates the camera’s gross data output rate in bytes per second with its current

settings. If the sum of the bandwidth assigned values is less than 125 MByte/s, the cameras should

be able to operate simultaneously without problems. If it is greater, you must lower the data output

rate of one or more of the cameras.

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

1 Port

GigE

Adapter

GigE

Camera

GigE

Camera

GigE

Camera

GigE

Camera

GigE

Network

Switch

Single Path

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Basler raL2048-48gm User Manual Page 49