Article DetailsKVM over IP Devices |
| Date Added: May 21, 2012 11:38:15 AM |
| Author: Johnrocks |
| Category: Computers: Hardware |
| KVM over IP devices use a dedicated micro-controller and potentially specializing video capture hardware to capture the video, keyboard, and mouse signals, compress and convert them into packets, and send them over an Ethernet link to a remote console application that unpacks and reconstitutes the dynamic graphical image. This KVM over IP subsystem is typically connected to a system's standby power plane so that it's available during the entire BIOS boot process. These devices allow multiple computers to be controlled remotely across a wide area network, local area network or telephone-line using the TCP/IP protocol. There are performance issues related with LAN/WAN hardware, standard protocols and network latency so user management is commonly referred to as "near real time". Access to most remote or "KVM" over IP devices today use a web browser, although many of the stand-alone viewer software applications provided by many manufacturers are also reliant onActiveX or Java. In comparison to conventional methods of remote administration, a KVM switch has the advantage that it doesn't depend on a software component running on the remote computer, thus allowing remote interaction with base level BIOS settings and monitoring of the entire booting process before, during, and after the operating system loads. Modern KVM over IP appliances or switches typically use at least 128-bit data encryption securing the KVM configuration over a WAN or LAN. KVM over IP devices can be implemented in different ways. With regards to video, PCI KVM over IP cards use a form of screen scraping where the PCI bus master KVM over IP card would access and copy out the screen directly from the graphics memory buffer, and as a result it must know which graphics chip it is working with, and what graphics mode this chip is currently in so that the contents of the buffer can be interpreted correctly as picture data. Newer techniques in OPMA management subsystem cards and other implementations get the video data directly using the DVIbus. Implementations can emulate either PS/2 or USB based keyboards and mice. An embedded VNC server is typically used for the video protocol in IPMI and Intel AMT implementations. The LCD IP KVM allows both local and remote operators to monitor and access multiple computers from remote locations using a standard Internet browser. Since IP KVM switches use TCP/ IP for their communications protocol, they can be accessed from any computer on the Net — whether that computer is located down the hall, down the street, or halfway around the world. They offer many advanced features, such as message board, concurrent access, virtual remote desktop, and so on, which enable a faster response to mission-critical server room emergencies. The new generation of KVM over the NET™ switches allows local and remote operators to monitor and access the entire enterprise data center over the Internet using a web-based browser. In addition, they offer out-of-band access – including external modem support – for BIOS-level troubleshooting when the network is down. http://www.rackmountsales.com/KVM_over_IP_DB_15_s/60.htm |
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