Avocent MPX1000 User Manual

The following table provides detailed instructions for tuning your MPX1000 extenders.

choppy video for a wired or 
wireless connection

Data Rate from the drop-down list on the Media LAN Settings page of the 
transmitter. Figure 4.1 on page 36 illustrates this web page.

This setting affects the degree of compression applied to video input prior 
to transmission across the extension network. The selected value 
indicates a target throughput in Mbps on the extension network. 
Supported rates for wireless media sessions include integer values from 
1 to 20 Mbps. Supported rates for wired media sessions include integer 
values from 1 to 40 Mbps. 

Contention for bandwidth grows as more receivers are bound to a 
MPX1000 transmitter. Excessive contention results in lost frames and 
increased retransmission requests. When this occurs, the frame rate of 
the session will fluctuate or drop on one or more receivers. Frame rates 
below 20 frames per second result in noticably choppy video and 
degraded audio. This is more likely to occur with wireless extension 
networks than wired extension networks, but the principle holds true in 
both cases.

To restore smooth video and audio playback, adjust the data rate setting 
downward as needed to obtain a frame rate of 24 fps or greater; this will 
reduce media LAN congestion, allowing the frame rate to rise. The effect 
of changes will be noticable within a few seconds. It is advisable to 
maintain the highest setting that yields an acceptable frame rate. Ensure 
that each receiver is properly aligned for maximum signal quality before 
adjusting the data rate.