Appendix D: FAQs310Bandwidth and KVM-over-IP PerformanceHow is bandwidth used in KVM-over-IP systems?The KX II offers next generation KVM-over-IP technology – the very bestvideo compression available. Raritan has received numerous technicalawards confirming its high video quality transmissions and the lowbandwidth utilization.The KX II digitizes, compresses and encrypts the keyboard, video, andmouse signals from the target server and transmits IP packets over theIP network to the remote client to create the remote session to the user.The KX II provides an at-the-rack experience based on its industryleading video processing algorithms.Screen changes, such as video, accounts for the majority of thebandwidth used – keyboard and mouse activity is significantly less.It is important to note that bandwidth is only used when the user isactive. The amount of bandwidth used is based on the amount ofchange to the server‟s video display screen.If there are no changes to the video – the user is not interacting with theserver – there is generally no bandwidth used. If the user moves themouse or types a character, then there is a small amount of bandwidthused. If the display is running a complex screen saver or playing avideo, then there can be a larger amount of bandwidth used.How does bandwidth affect KVM-over-IP performance?In general, there is a trade-off between bandwidth and performance.The more bandwidth available, the better performance can be. Inlimited bandwidth environments, performance can degrade. The KX IIhas been optimized to provide strong performance in a wide variety ofenvironments.What factors affect bandwidth?There are many factors that determine how much bandwidth will beused. The primary factor, as discussed previously, is the amount ofchange in the target server‟s video display. This is dependent on theuser‟s task and actions.Other factors include the server‟s video resolution, networking speed andcharacteristics, client PC resources, and video card noise.The KX II has very sophisticated video processing algorithms thatoptimize bandwidth and performance for a variety of environments. Inaddition, they are highly configurable since there are many settings tooptimize bandwidth usage. In particular, the Connection Speed settingin the remote clients (VKC, MPC) can be set to reduce the bandwidthused.
