Appendix D: FAQs328Ethernet and IP NetworkingDoes the KSX II offer dual gigabit Ethernet ports to provideredundant fail-over, or load balancing?Yes. The KSX II features dual gigabit Ethernet ports to provideredundant failover capabilities. Should the primary Ethernet port (or theswitch/router to which it is connected) fail, the KSX II will failover to thesecondary network port with the same IP address, ensuring that serveroperations are not disrupted. Note that automatic failover must beenabled by the administrator.How much bandwidth does the KSX II require?The KSX II offers next generation KVM-over-IP technology - the verybest video compression available. Raritan has received numeroustechnical awards confirming its high video quality transmissions and thelow bandwidth utilization.Raritan pioneered the KVM-over-IP functionality that allows users totailor their video parameters to conserve network bandwidth. Forinstance, when connecting to the KSX II through a dial-up modemconnection, video transmissions can be scaled to grayscale - allowingusers to be fully productive while ensuring high performance.With that in mind, the following data refers to the KSX II at its defaultvideo settings - again, these settings can be tailored to a specificenvironment. They can be increased to provide even higher quality video(color depth), or decreased to optimize for low-speed connections.As a general rule, a conservative estimate for bandwidth utilization (atthe KSX II's default settings) is approximately 0.5Mbit/second per activeKVM user (connected to and using a server), with very occasional spikesup to 2MBit/second. This is a very conservative estimate becausebandwidth utilization will typically be even lower.Bandwidth required by each video transmission depends on what task isbeing performed on the managed server. The more the screen changes,the more bandwidth is utilized. The table below summarizes some usecases and the required bandwidth utilization at the KSX II's defaultsettings on a 10Mbit/s network:Use case RequiredbandwidthIdle Windows Desktop 0 MbpsMove Cursor Around Desktop 0.18Mbps
