![]() ![]() Another method to have a single DB25 or similar connector that aggregated connections at the switch with three independent keyboard, monitor and mouse cables to the computers. Depending on the product, the switch may present native connectors on the device where standard keyboard, monitor and mouse cables can be attached. KVM switches offer different methods of connecting the computers. A common example of home use is to enable the use of the full-size keyboard, mouse and monitor of the home PC with a portable device such as a laptop, tablet PC or PDA, or a computer using a different operating system. ![]() This switch then allows data center personnel to connect to any server in the rack. Use Ī KVM Switch is a hardware device, used in data centers, that allows the control of multiple computers from a single keyboard, monitor and mouse (KVM). Yes* Latency time within 1 second while switching between channels/ports. Limited* supported, but does not allow USB re-enumeration, which not only causes long delays in switching, but also sometimes causes HPD (Hot-Plug Device) errors to the OS system(s). Supports only limited/fixed general keyboard and mouse profiles, Special keyboard and mouse functions will not work, Can only share "standard" USB keyboard/mouse, Can't share other USB-HID such as: touchscreen monitor, drawing tablet, etc., Generated HPD error while using other USB-HID Longest latency, delay in device availability, Can't use USB keyboard/mouse to control KVM switching process, No Hot-Key command, Generates HPD error when switching with particular OS's USB keyboard/mouse switching control, shorter switching time, Hot-Key Commandsįull USB keyboard/mouse switching control, DDM ports can work with all USB-HID class devices, Short switching time (latency: within 1 sec.), Hot-Key commands (apply to all USB Semi-DDM ports), Lower cost than Full DDM class switchesįull USB keyboard/mouse switching control, DDM ports can work with all USB-HID class devices, Shortest switching time (no latency), Hot-Key commands (apply to all USB DDM ports) Passes all signals between USB devices and target system/computer(s) USB-HID (other than keyboard/mouse) support Wireless combo keyboard and mouse support Windows7/Windows 8 built-in touchscreen monitor driver support No, shows as standard keyboard and mouse no matter what keyboard/mouse are connected to the KVM Windows 7/Windows 8 showing correct connected devices Supports special keyboard and mouse functions Longest, depending on connected system's OS (about 10–15 seconds) This means that you can now use the extra function keys, wheels, buttons, and controls that are commonly found on modern keyboards and mice. This class of KVM switch overcomes the frustrating limitations of an Emulated USB Class KVM by emulating the true characters of the connected devices to all the computers simultaneously. DDM USB KVM Dedicated Dynamic device mapping USB console port(s) work with all USB-HID (including keyboard and mouse) and maintain the connected devices' special functions and characteristics to each connected/targeted system. This class of KVM takes advantage of DDM (Dynamic Device Mapping) technology. Semi-DDM USB KVM Dedicated USB console port(s) work with all USB-HID (including keyboard and mouse), but do not maintain the connected devices' presence to all of the targeted systems simultaneously. ![]() There are also USB KVM devices that allow cross-platform operating systems and basic keyboard and mouse sharing. ![]() However, this class of KVM switch only uses generic emulations and consequently has only been able to support the most basic keyboard and mouse features. Emulated USB provides an instantaneous and reliable switching action that makes keyboard hotkeys and mouse switching possible. Emulated USB KVM Dedicated USB console port(s) are assigned to emulate special sets of USB keyboard or mouse switching control information to each connected/targeted system. The switching to different ports is just as if you were to physically plug and unplug a USB device into your targeted system. USB Hub Based KVM Also called an Enumerated KVM switch or USB switch selector, a connected/shared USB device must go through the full initiation process (USB enumeration) every time the KVM is switched to another target system/port. The classes of KVM switches that are reviewed, are based on different types of core technologies in terms of how the KVM switch handles USB I/O devices-including keyboards, mice, touchscreen displays, etc. With the popularity of USB-USB keyboards, mice, and I/O devices are still the most common devices connected to a KVM switch. ( June 2014) ( Learn how and when to remove this template message) Statements consisting only of original research should be removed. Please improve it by verifying the claims made and adding inline citations. This section possibly contains original research. ![]()
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