National Instruments NI CVS-1450 Series User Manual

© National Instruments Corporation

The IEEE 1394 bus provides a fixed amount of bandwidth that is shared 
among the three IEEE 1394a ports on the CVS-1450 device. These ports 
provide direct connection for up to three DCAM-compliant IEEE 1394 
cameras, depending on the amount of bandwidth each camera requires. 
Higher frame rates and larger image sizes require a higher data transfer rate 
and use more bandwidth.

Table 1-1 shows the maximum number of cameras the CVS-1450 device 
supports for three common video formats. Use this table as a guide when 
determining the combination of cameras to use in your application.

Bandwidth calculations described in Table 1-1 do not include software decoding of 

YUV images to RGB. This conversion time is dependent on processor speed.

By triggering your cameras at a frame rate slower than those rates listed in 
Table 1-1, you can operate more cameras simultaneously. If the camera 
combination exceeds the amount of available bandwidth, the software 
returns an Insufficient Resources error.

Table 1-1.  Available Camera Bandwidth

640 

× 480 

8-bits/pixel mono

30

3

60

1

100

1

640 

× 480 YUV 

(4:2:2) 
16-bits/pixel color

15

3

30

1

1024 

× 768 

16-bits/pixel mono

7.5

2

15

1