Axis Communications Axis 211A User Manual

Page 62

AXIS 210A/211A - Technical Specifications

Bandwidth
As there are many factors that affect bandwidth, it is very difficult to predict the required

amounts. The settings that affect bandwidth are:

• the image resolution
• the image compression
• the frame rate
• the MPEG-4 object type
• the MPEG-4 GOV structure
• the maximum exposure time.

There are also factors in the monitored scene that affect the bandwidth. These are:

• the amount of motion
• the image’s complexity
• the lighting conditions.

For MPEG-4, if there is only limited bandwidth available, and if this is more important

than the image quality, using a constant bit rate (CBR) is recommended. Use a variable bit

rate (VBR) if the image quality needs to be maintained at a higher level. With multiple

viewers, and If supported on the network, consider using MPEG-4 multicasting, as the

bandwidth consumption is much lower.