Dell Precision R5400 Manual

Also see for Precision R5400: Brochure Technical guide Setup and quick reference guide Specifications Manual

Contents

TER0806005 Issue 1 11Off-Campus Network ConsiderationsIn an off-campus remoting environment (WAN or MAN), IT administrators will encounter a number of itemswhich need special attention. These include:• restricted bandwidth environments• network latency• firewalls and virtual private networks (VPN’s)Restricted Bandwidth EnvironmentsIn cases where the planning bandwidth is not available, the IT administrator needs to make tradeoffs to achievethe optimal experience. In these cases the IT administrator should take the average bandwidth usage as well asUSB and audio traffic into account.Minimum Bandwidth Requirements – At a minimum, 3 Mbps peak bandwidth per user is required to beavailable for reliable system operation.Average versus Planning BandwidthThe average bandwidth used will typically be significantly lower than the planning bandwidth for users doinginteractive operations. Measurements have shown task workers consuming less than 200 kbps average, andknowledge workers consuming less than 1 Mbps on average. IT administrators can take advantage of this whenplanning their network deployments by measuring the requirements of their target users.USB and Audio ConsiderationsIn restricted bandwidth environments, USB and audio traffic can be a significant factor in overall bandwidthusage. For USB traffic, keyboard and mouse traffic remains small but IT administrators should budget for acertain amount of data transfers to occur.USB – upstream (input) or downstream (output) traffic that can range up to 12 Mbps in either direction.Keyboard and mouse USB traffic requires significantly less than 1Mbps. USB traffic is not compressed and canbe allocated based on the user segment’s USB peripheral throughput needs.Audio traffic requires low peak bandwidth but it can significantly affect a user’s average bandwidthrequirements.Audio – For HD audio, up to 3 Mbps bandwidth allocation is required downstream to the speakers and 1.5Mbps upstream from the microphone. For low bandwidth situations, audio may be compressed resulting in a peruser audio bandwidth as low as 800Kbps in each direction audio is used.Network Latency ConsiderationsIn general, to provide system responsiveness comparable to a traditional desktop, the round trip networklatency should ideally be less than 30ms. This requirement easily fits within corporate or campus LANinfrastructures. The hardware advantages of PC-over-IP technology help mitigate the impact of high latencylinks to deliver an exceptional user experience. Optimizations for network latencies >30ms will be covered in aseparate document.NAT ConsiderationsPC-over-IP ® traffic cannot undergo network address translation (NAT). The Host and destination IP addressescannot be modified as the packets move between the host and the portal. To support NAT, PC-over-IP® trafficcan be tunneled through a VPN.

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