What Does KVM Stand For?
The acronym "KVM" stands for "Keyboard, Video, and Mouse." KVM identifies a class of computer hardware-based devices that enable users to control two or more computers from a single keyboard, video monitor and mouse.
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Function
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A KVM device connects a keyboard, video monitor and mouse (or other pointing device) to two or more computer systems with either a direct hardware connection or a hardware-and-communications software connection. KVM devices are particularly useful in data centers and network operations centers where they enable system administrators to manage large numbers of rack-mounted computers and servers from a single control point.
Features
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The most basic KVM device is a 2-port KVM switch, which is a Y-shaped configuration of cables with a manual switch that enables the user to swap the active connection to the keyboard, video monitor and mouse between two computers. KVM switches may have separate keyboard, video and mouse ports and cables or---to minimize cable clutter---combined KVM ports and cables. More sophisticated KVM switches enable multiple users to control multiple computers and use electronic switching to manage multiple active connections.
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Types
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There are two basic types of KVM technology: analog KVM and KVM over IP. Analog KVM is essentially a direct, physical connection between the KVM device and the managed computers. There is a limit to the cabling distance that analog KVM devices can be placed from the connected computers, but that distance can be increased to several hundred feet by using an intermediary KVM "extender" device. KVM devices based on KVM over IP (Internet Protocol) technology overcome the distance limitation because the analog signals to and from the keyboard, video and mouse are converted into IP packets which can be transmitted over local area networks, wide area networks, and the Internet.
Considerations
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KVM devices may not support all types of keyboard, video and mouse ports, devices, or computing platforms. Consult the manufacturer's specifications for a particular KVM product to ensure that the device is compatible with and supports your computing environment.
Benefits
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KVM devices can save time, money and space. KVM devices enable users to work from a centralized control point, save the cost of a dedicated keyboard, monitor and mouse for each computer, free up space on your desktop and reduce cable clutter.
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References
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- Photo Credit Image by Flickr.com, courtesy of Ben McC
