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Bandwidth AXIS 230
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Other Considerations
• The MPEG-2 encoder chip in the AXIS 230 is designed for constant video bit rates from 1.0 -
8.0 Mbit/s. The parameter on the encoder chip that controls the video bit rate allows even
lower settings, but not at constant bit rates. At low bit rates, the encoder delivers variable bit
rates, and the rate is strongly affected by the selected video resolution and image information.
• The video quality level can be set from 1 (low) to 7 (high.) When using the levels 1-3, the bit
rate can become variable. The total bandwidth usage is determined by the audio and video
quality level and the protocol-specific contribution. Using quality levels lower than 3 may
reduce bandwidth usage at the expense of image quality.
The table below shows recommended video quality levels at various resolutions:
• There is a limit of 3 simultaneous uploads at any one time, although the number of event
types configured to upload can be greater than 3.
• If installing multiple units on the same network, the bandwidth requirements will be signifi-
cantly higher.
Resolution Unicast Multicast
4CIF 4-7 4-6
2CIF 3-7 3-6
CIF 3-7 3-6
QCIF 3-7 3-6