When it comes to KVM extenders over RJ45 cable, there are several technical considerations to keep in mind:

1. Maximum Distance: The maximum distance over which a KVM extender 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 30 and 100 meter.

2. Resolution: The maximum resolution supported by the KVM extender 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 KVM extender 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: KVM extenders 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 KVM extender 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 KVM extenders support the transmission of audio signals as well. If you require audio support, ensure that the device you choose has this feature.

7. Power: Some KVM extenders require external power sources to function properly. Check the requirements of the device you choose to ensure that it is compatible with your setup.

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