Instruction manual

Noisy video cards

• A 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 also be digitized and sent over the network. Quality

video cards, in our experience, offer better performance simply

because they don’t add analog noise.

• Some external KVM switches generate video noise as well. Try to

keep cables short, in order to reduce this effect.

• Enable the Noise Filter option (on the Video Tuning menu) to

mitigate noise issues.

Network performance

The IP KVM switch 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 unit will

send as much data as your network connection and VNC client allow.

Network latency, which is the total time it takes for a packet to get

to the IP KVM switch and come back, has the biggest impact on

perceived performance and usability. Network bandwidth has a lesser

effect, particularly 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.

Using the Advanced Video Tuning Feature

The Advanced Video Tuning menu allows you to adjust the qualities of

the video in your VNC sessions, and can be accessed by clicking the

Advanced button on the Video Tuning VNC menu. While many users

will probably allow the IP KVM switch to automatically conﬁgure the

video properties, you can use this menu to exercise a great deal of

control over the settings if you wish.

The Presets section contains up to sixteen different settings, plus the

factory setting. If a number is highlighted, then that preset has been

programmed with valid settings and may be used. Note that the Factory