![]() ![]() Printer mapping for non-spooling client (Thin client devices) Remote Windows screen update data (ThinWire) No longer used. Previously: Citrix Browser Acceleration Seamless Windows screen update data (ThinWire) The following are the numerical priorities in the XenApp 6.5 ICA/GPO: Low Priority: used for background virtual channels such as printing.Medium Priority: used for bulk virtual channels such as drive mapping, scanners (TWAIN), and so forth.High Priority: used for interactive channels such as graphics, keyboard, and mouse.Very High Priority: used for real-time channels such as audio.The network administrator will be able to prioritize each of these classes of service, independently from each other, based on the connection port number used for the connection. The four classes of service are the following: Similar to TCP port number, the relevant configured UDP port number could be used by network administrators to prioritize UDP traffic. In XenDesktop 5.5, UDP channel is used for Very High Priority data like real-time audio. ![]() Each ICA virtual channel will be associated with a specific class of service and be transported in the corresponding TCP connection using configured unique port number. Each of these connections (streams) will be associated with a different class of service. In addition in XenDesktop 5.5, there is an optional UDP connection along with multiple TCP connections (there are five streams available to use). In XenApp 6.5 and Citrix XenDesktop 5.5 there is an option to configure multiple TCP connections to carry the ICA traffic between the client and the server (there are four streams available to use). For example, the client Graphics channel would communicate with the Graphics channel of the server within the ICA stream. There is a maximum of 32 channels that are available on each ICA stream. Each of the virtual channels above for both client and server would communicate with each other over the correct virtual channel. on between the client and the XenApp server. Within the ICA stream exist virtual channels, these virtual channels are for functions such as printing, audio, keyboard, mouse, video, drive mapping etc. Frame Trailer – Asynchronous Transport Protocol Data.Command (required) – Starting point of the ICA protocol.Encryption – Managed data within encryption.Reliable – Detection of errors and recovery.Frame Head – Stream Oriented Transport data.The ICA packet is made up of the following: It also supports Quality-Of-Service (QoS) and other bandwidth optimization features. The ICA protocol is a protocol optimized for Wide Area Networks or WANs with high latency links. QoS is a mechanism to prioritize network traffic to help ensure that the most important data gets through the network as quickly as possible. In XenApp 6.5 and XenDesktop 5.5, with Receiver 3.0 (including Online Plugin 13.0), Citrix introduced support for true network based Quality of Service (QoS) to the ICA or HDX protocol.
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