4XEM 4X-PT7135 User Guide

To achieve good real-time visual effect, the network bandwidth should be large enough 

to allow a transmission rate of greater than 20 image frames per second. If the 

broadband network is over 1 Mbps, set the “Fix bit rate” to 1000Kbps or 1200Kbps. The 

maximum frame rate is 30. If your network bandwidth is more than 512Kbps, you can 

fix the bit rate according to your bandwidth and set the maximum frame rate to 30 fps. 

If the images vary dramatically in your environment, you may want to slow the 

maximum frame rate down to 20 fps in order to lower the rate of data transmission. 

This allows for better video quality and the human eyes cannot readily detect the 

differences between those of 20, 25, or 30 frames per second. If your network 

bandwidth is below 512 Kbps, set the “Fix bit rate” according to your bandwidth and try 

to get the best performance by fine-tuning with the “Maximum frame rate”. In a slow 

network, greater frame rate results in blur images. Another work-around is to choose 

“160x120” in the “Size” option for better images. Video quality performance will vary 

somewhat due to the number of users viewing on the network; even when the 

parameters have initially been finely tuned.    Performance will also suffer due to poor 

connectivity because of the network’s burst constraint. 

To have the best video quality, you should set “Fix quality” at “Detailed” or “Excellent” 

and adjust the “Maximum frame rate” to match your network’s bandwidth. If your 

network is slow and you receive “broken” pictures, go to the TCP protocol in 

“Connection type” and choose a more appropriate mode of transmission. The images 

may suffer a time delay due to a slower connection.    The delay will also increase with 

added number of users.   

If you have a broadband network, set “Fix quality” at ”Normal” or better, rather than 

setting “Fix bit rate”. You can also fix the bandwidth according to your actual network 

speed and adjust the frame rate.    Start from 30 fps down for best results but not below 

15 fps.    If the image qualities are not improved, select a lower bandwidth setting.