2007 ATEN Technology, Inc. www.aten-usa.com
Why Network Administrators Should Explore the “V” in K-V-M Switches
reduces the sharpness relative to passing video though at the native resolution. When using an IP KVM,
it is critical to characterize the primary mode of access to the controlled computers. If the IP KVM is
used for occasional monitoring and maintenance, then optimize video card settings for the local ac-
cess. If IP KVM is the primary mode of access, then optimize video card settings for that purpose.
Although a network administrator may know the bitmap resolution, refresh rate, color depth, and the
type of connector, it is not enough information to help in the selection of the best KVM switch and
monitor.
Other factors include knowledge of the highest resolution video to accommodate the KVM switch and
sharpness of the video. Without clearly defi ned industry standards on “sharpness” or “clarity”, or even
how to specify video bandwidth, there are other factors to understand when specifying and setting up
a KVM system.
A typical KVM switch video specifi cation might read as follows:
While it appears that Switch B is better, in reality it is not. The above specs can be misleading and
omit the proper defi nitions of terms and limits for measurement. Hence, these numbers are suspect
if not meaningless.
This example is not given to criticize manufacturers that have comparable specs but it presents
challenges to network administrators in the selection process. KVM manufacturers should provide
detailed specs to more accurately portray video resolution:
CONSERVATIVE-RATED KVM SWITCH MODEL A:
Compare this to Switch B below. It would seem that Switch A is inferior to Switch B.
OPTIMISTICALLY-RATED KVM SWITCH MODEL B:
De-mystifying Video Resolution Specifications
-P08-
VGA
1600 H x 1280 V @70 Hz
500 ft
200 MHz
WUXGA
1920 H x 1200 V
1,000 ft
300 MHz
Format
Resolution (w/ 200 ft total cable)
Maximum Cable Length
Bandwidth
Format
Resolution (w/ 200 ft total cable)
Maximum Cable Length
Bandwidth
G
orma
X
rm
00 f
Maximum Cable Len
t
,000
Maximum
able Lengt
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