Connectivity is key with this device and it is designed to ensure there is no crosstalk between input devices and to maintain the overall security of the network. In this context, we have a four-port DVI-I KVM switch that, in short, allows you to have one output monitor and four input sources. Suppose you have four computers, each with DVI-I outputs, and one monitor with its own DVI-I input. You need to connect four DVI-I computer ports to ports one through four on the KVM switch, then connect a keyboard and mouse, and finally run USB cables between the KVM and each of the computers. Connect KVM. and the device will light up with a blue LED bar at the top and clear indicators showing various keyboard issues (capital letter blocking, number blocking) as well as the computer source you have selected to send to the monitor. Which leads to the question - how do I turn off all the lights? Some of my work is done in low light where I don't want bright KVM lighting. This question led me to a manual page referenced by a very short manual that came with KVM. However, the guide there isn't much longer and doesn't address this issue at all, leading me to believe there's no way to change the brightness of the LED. KVM works exactly as intended, the only issue I had was switching from my bluetooth mouse/keyboard combo to wired. That is, it is not possible to connect a Bluetooth mouse and keyboard to this device for use with the selected computer source. Note that each of the KVM switches is only intended for one type of I/O source, so this one, the SC840, works with DVI-I while there are others for HDMI and DisplayPort. Of course, if you have a computer from the same year, another from a few years ago, and one from a different brand, you might have one with HDMI output, one with DVI-I, and one with DP. What I'd like to see is a device with a choice of inputs and an output for the one type of monitor you have, or even multiple possible outputs so you can switch monitors without being limited by output type. KVM is present. I'd also really like to see an improved guide that really breaks down the connections and pathways, including what's possible and what's not, and some sort of methodology for making adjustments to make things happen like the one I've outlined in The previous paragraph can be slightly corrected. If you are looking for a specific solution for the routine setup of standard PCs or Macs and a standard monitor with a DVI-I connection and you need reliable security, you have come to the right place. It's very well built and shows no signs of degradation in the signal path for high-bandwidth video.
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