Operating instructions

CHAPTER 2 TECHNICALLY SPEAKING
17
F
igure 10 – Dedicated Processors in a KVM switch support a full
set of instructions for each attached computer.
.
Benefits
• Continuous, fault-free operation. A 1:1
microprocessor to computer ratio is more
efficient in processing data and provides
the most reliable performance. Each
computer connected to the dedicated
processor KVM switch receives all the
data required for each computer to
constantly recognize the keyboard and
mouse. Each processor “talks” to only
one computer, thus eliminating errors,
freezing, or other problems that can
occur in the shared processor
configuration. This reliability is an
important factor if your company cannot
tolerate downtime, errors or other
catastrophic problems.
• All computers can boot up simultaneously, which decreases start-up time.
• NTI’s patented USB KVM switch allows simultaneous boot-up of USB-enabled PCs and Macs. Other
USB KVM switches require that each USB computer be booted sequentially, one at a time.
• Failure of one processor will not cause the entire KVM switch to fail – only the port controlled by that
processor will fail.
Processor Software
A KVM switch processor can only do what engineers tell it to do. Each processor contains firmware
(software code) that gives the switch operating instructions. The firmware engineering determines what
systems (CPUs, keyboards, mouse and video) the KVM switch can recognize and how it can process the data
for final output to the monitor.
This engineering is where the various manufacturers differ the most. Since so many third-party vendors offer
their own computer products, it is nearly impossible to program a KVM switch processor to recognize them
all. Most manufacturers concentrate on keeping costs low and therefore provide minimal compatibility with
the various systems on the market. A few manufacturers (including NTI) invest in more highly engineered
technology to allow maximum compatibility.
Most manufacturers do not invest time into developing a good user interface, which can make use of their
KVM switch products cumbersome. Again, a few manufacturers, such as NTI, take that extra time to design a
user interface that is intuitive and easy-to-use.
The firmware instructs the processor which protocols should be used to recognize the:
 Mouse, such as PS/2, IBM RS6000, HP9000, and SGI. Specialized products, such as trackballs, touchpads,
and graphic tablets, require additional programming. Also, high-end engineering can provide smooth, fluid
mouse movement that users appreciate, but few KVM switch manufacturers implement. If the switch
manufacturer does not include this movement code, the mouse movement appears jerky and reacts in
delayed motion.
 Keyboard, such as IBM, PS/2 and SGI. The firmware instructs the processor on how to recognize
keystrokes and take them as commands instead of transparently passing them to the computer, such as