Tripp Lite's NetController 4-Port, 1U rackmount KVM Switch is an affordable, highly-flexible enterprise class KVM Switch, which allows the user to connect either USB or PS/2 keyboards and mice. In addition, P780-Series USB/PS2 combo KVM cable kits allow you to connect either USB or PS/2 computers, without the need to purchase separate cables or adapters. Control up to 4 directly connected computers, or expand the number of connected computers to up to 244 by daisychaining up to 15 additional B042-Series KVM switches. Switch between connected computers via the On-Screen Display (OSD), pushbuttons, or keyboard hotkey commands. Other features include: password protection, auto-scanning, auto-logout, firmware upgrade and video support up to 2048 x 1536 (QXGA). Mounts easily in a standard 19" rack/cabinet and includes all necessary mounting hardware. Compatible with all major operating systems. Constructed of heavy-duty steel housing.

Tripp Lite 4-Port 1U Rack-Mount USB/PS2 KVM Switch Features,

• NetController 4-Port, 1U rackmount KVM switch
• Control 4 computers via a single VGA monitor and USB or PS/2 keyboard/mouse
• P780-Series USB/PS2 combo KVM cable kits allow you to connect either USB or PS/2 computers, without the need to purchase separate cables or adapters
• Control up to 244 computers by daisychaining up to 15 additional B042-Series KVM switches
• Allows for easy customization of ports by daisy-chaing any combination of B042-Series KVM's (4-, 8- or 16-port)
• Standard 19" Rackmount size - hardware included
• On-Screen Display (OSD) menu for intuitive operation and easy control
• Switch between connected computers via the On-Screen Display (OSD), pushbuttons, or keyboard hotkey commands
• Supports video resolution up to 2048 x 1536
• Password protection and auto-logout features
• Firmware upgradeable
• Robust metal case design ensures best EMI/RFI shielding and video quality
• Hot-swappable: disconnect and reconnect USB computers without rebooting
• Supports standard 5-button Microsoft, Logitech, or comparable mice
• Supports standard Microsoft, Logitech, or comparable keyboards
• Compatible with all major operating systems
• Constructed of heavy-duty steel housing