ConnectPRO UDP2-14AP proof test for production confirmation
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Classes of USB KVM Switches
With the popularity of USB; USB keyboards, mice and I/O devices are still the most common devices connected to a KVM switch. The classes of KVM switches reviewed are based on different types of core technologies in terms of the KVM switch handling USB I/O devices--including keyboard, mouse, touch screen display, etc. (USB HID class devices- Human Interface Devices ). 1. USB HUB based KVM Also called Enumerated USB KVM switch . A connected/shared USB device is required for the full initiation process (USB enumeration) EVERY TIME the KVM is switched to another target system/port. The switching to different ports is just as if you were to physically plug and unplug a USB device into your targeted system. 2. 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. Emulated USB provides an instantaneous and reliable switching action that makes keyboard hot...
How to identify different classes of KVM switches
If your KVM switch does not allow you to switch ports/channels by hitting the hot-key combinations, then you have a "HUB class" KVM switch. For the "Emulated KVM Switch class,” you’ll find that there is a specifically assigned USB port that you can plug your keyboard into for the hot-key commands. For both "Semi-DDM class" and "DDM class" KVM switches, there is no difference in which DDM port you can plug your keyboard into for the hot-key commands. As long as you plug in the keyboard or the wireless USB dongle to one of the DDM ports (normally there are at least two DDM ports/ KVM switch) you will have hot-key commands. Most importantly, you could have up to two connected keyboards (one for each DDM port) and the hot-key commands would work on both keyboards between all of the connected systems. The difference between "Semi-DDM" and "DDM" KVM switches are: 1. Semi-DDM switches still cause delays (but very short) when swit...
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