A VGA extender KVM (Keyboard, Video, Mouse) over RJ45 cable is a device that allows you to extend the distance between a computer or server and a monitor, keyboard, and mouse by transmitting these signals over a standard Ethernet cable. When using a VGA extender KVM over RJ45 cable, there are several technical considerations to keep in mind:

1. Maximum Distance: The maximum distance over which a VGA extender KVM can transmit signals over an RJ45 cable will depend on the specific device you are using. Generally, the maximum distance for this type of extender is between 100 and 300 feet.

2. Resolution: The maximum resolution supported by the VGA extender KVM will impact the distance over which it can transmit signals. Higher resolutions require more bandwidth and may not work over longer distances.

3. Cable Quality: The quality of the RJ45 cable used with the VGA extender KVM can impact the quality of the video signal transmitted. It is important to use a high-quality, shielded cable to ensure optimal performance.

4. Latency: VGA extender KVMs may introduce some latency or delay in the signal transmission, which can impact the responsiveness of the mouse and keyboard. Look for a device with low latency to minimize this effect.

5. Compatibility: Ensure that the VGA extender KVM you choose is compatible with your computer or server and the monitor you plan to use it with. Some extenders may require specific drivers or software to function properly.

6. Audio Support: Some VGA extender KVMs support the transmission of audio signals as well. If you require audio support, ensure that the device you choose has this feature.

By keeping these technical considerations in mind, you can choose the right VGA extender KVM over RJ45 cable for your needs and ensure optimal performance and reliability.