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Millions of XenApp users today access their applications over a local area network (LAN) Thanks to the low latency and high bandwidth afforded by the LAN, the user experience is normally indistinguishable from having the applications running locally on a PC As we move outside of the LAN, though, the connection choices for users to connect to their Citrix applications in several geographies are slim, and the relatively new solutions offered by wireless WAN (wWAN) carriers such as DirecPC satellite and mobile wireless carriers such as Sprint/Nextel, T-Mobile, Verizon, and others, offer a tremendous solution in the Citrix environment By providing truly anytime/anywhere access to the Citrix environment, these solutions enable even traveling laptop carriers to stay connected everywhere (Boeing is even working to provide satellite connectivity on planes as well) Wireless WANs, however, present the challenge of lower bandwidth and higher latency, as well as jitter (variable latency) These issues can be so pronounced in wWANs that the user experience is degraded to the point of being unacceptable
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TIP: Throughput and latency are the two elements that define the speed of a network Throughput is the quantity of data that can pass from source to destination in a specific time Roundtrip latency is the time it takes for a single data transaction to occur (that is, the time between requesting data and receiving it) Although most literature from wWAN providers focuses on throughput, the latency is far more important to XenApp usability When shopping for a wWAN carrier, check on their latency The underlying wireless networks are based on circuit-switched voice architectures, which do not contain efficient mechanisms for sending data-link layer acknowledgments To improve data efficiency, the networks typically wait for multiple frames to arrive before replying with an acknowledgment This delay is directly reflected in the packet latency Latency has a critical impact on the XenApp user experience, because every user action must travel across the network from the client to the server, and the server response must return to the client before the user sees an update On a LAN, latency is typically very low less than 10 ms Latencies on wired WANs, however, are typically in the 50 200 ms range, whereas wireless WANs are usually in the 300 3,000 ms range Latency normally increases with a corresponding increase in the size of the TCP packet On a LAN, this increase is barely noticeable, because ample bandwidth is generally available On a wired WAN, it typically has a minor impact On a wWAN, for example, the latency for a 32-byte packet may be 400 ms, whereas the latency for a 1,460byte packet may be significantly more, at 1,800 ms This high (and variable) latency on a wWAN can significantly interfere with a XenApp session to the point where the user may find the experience unacceptable Citrix provides a variety of features and settings that can be configured to improve the user experience with wWANs It is important to note that these changes do not raise the user experience to the level of a wired WAN connection, but they do take the user experience from unbearable to bearable It is also important to note that these features are not available with the Microsoft Remote Desktop client Because our recommendation for all remote users is to utilize the Citrix Web Interface client, the client settings discussed will be implemented on the Web Interface server With the newer versions of Web Interface there is an option to turn on bandwidth control and allow the users to choose to disable features to lighten the load across the network and improve their connection speed Some of the settings remove features that users on LANs and wired WANs will want to maintain, such as drive mapping and printer mapping Shutting down these virtual channels will give the ICA channel more room for video, keyboard, and mouse clicks, thus improving the session for the users If users are using a custom-configured Program Neighborhood client, the settings referenced can be performed on the client The settings and features that can be set and optimized include the following: Enable SpeedScreen Technologies (see the previous section) Enable Maximum Data Compression Enable Mouse Movement and Keystroke Queuing Enable Persistent Cache Optimize IIS to Cache Images and Utilize the Cache-Control HTTP Header
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