Basler raL2048-48gm User Manual download pdf (Page 53)

AW00118302000 Network Related Camera Parameters and Managing Bandwidth

Basler racer GigE 43

Step 5 - Calculate “data bandwidth assigned” to each camera.

For each camera, there is a parameter called Bandwidth Assigned. This read only parameter

indicates the total bandwidth that has been assigned to the camera. The Bandwidth Assigned

parameter includes both the bandwidth that can be used for frame data transmission plus the

bandwidth that is reserved for packet resends and camera control signals. To determine the “data

bandwidth assigned,” you must subtract out the reserve.

You can use the formula below to determine the actual amount of assigned bandwidth that is

available for data transmission. To use the formula, you will need to know the current value of the

Bandwidth Assigned parameter and the Bandwidth Reserve parameter for each camera.

Step 6 - For each camera, compare the data bandwidth needed with the data bandwidth

assigned.

For each camera, you should now compare the data bandwidth assigned to the camera (as

determined in step 4) with the bandwidth needed by the camera (as determined in step 3).

For bandwidth to be used most efficiently, the data bandwidth assigned to a camera should be equal

to or just slightly greater than the data bandwidth needed by the camera. If you find that this is the

situation for all of the cameras on the network, you can go on to step 6 now. If you find a camera

that has much more data bandwidth assigned than it needs, you should make an adjustment.

To lower the amount of data bandwidth assigned, you must adjust a parameter called the Inter-

packet Delay. If you increase the Inter-packet Delay parameter value on a camera, the data

bandwidth assigned to the camera will decrease. So for any camera where you find that the data

bandwidth assigned is much greater then the data bandwidth needed, you should do this:

1. Raise the setting for the Inter-packet delay parameter for the camera.

2. Recalculate the data bandwidth assigned to the camera.

3. Compare the new data bandwidth assigned to the data bandwidth needed.

4. Repeat 1, 2, and 3 until the data bandwidth assigned is equal to or just greater than the data

bandwidth needed.

Note

If you increase the inter-packet delay to lower a camera’s data output rate

there is something that you must keep in mind. When you lower the data

output rate, you increase the amount of time that the camera needs to transmit

an acquired frame. Increasing the frame transmission time can restrict the

camera’s maximum allowed acquisition line rate.

Data Bandwidth Assigned Bandwidth Assigned

100 Bandwidth Reserved–

100

-----------------------------------------------------------------------

=

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 237 238

No comments

Basler raL2048-48gm User Manual Page 53