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Appendix C: Getting Peak Performance
Choose the best video mode
y We recommend using 60Hz refresh rate and 1024x768 resolution. Using a smaller
resolution like this allows you to fit multiple windows on your remote desktop. Higher
refresh rates stress the video card's quality and do not provide any additional
information or benefit.
Noisy video cards
y A NewStar Digital KVM works by converting the analog video signals emitted by your
video card into digital data. If there is noise on that signal, then it must be digitized
and sent over the network too. The name brand, quality video cards have, in our
experience, better performance simply because they don't add analog noise.
y Some external KVM switches generate video noise too. Try to keep cables short to
reduce the effect.
y Enable the Noise Filter option (on the Video Tuning menu) to mitigate noise issues.
Network performance
y The NewStar Digital KVM via IP will always send as much data as it can, given
what's happening on the screen and the actual network performance. When nothing is
changing on the video screen, zero bytes are sent over the network. If the whole
screen is changing, then the module will send as much data as your network
connection and VNC client can handle while not allowing it to fall behind.
y Network latency, which is the total time it takes for a packet to get to the KVM and
come back, has the biggest impact on perceived performance and usability. Network
bandwidth has a lesser effect, particular when just moving the mouse around. Only a
few bytes need to be sent when the mouse is moving (and nothing else is changing
on the screen), but the round-trip-time limits the hand-eye coordination of the user if it
is too great. Both actual bandwidth and measured network latency are shown in the
Main Menu.
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