Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps Información técnica descargar pdf (Pagina 53)

Chapter 3 Installing Applications 39

Keyboard and mouse input

Session control

Framing for asynchronous connections

Error detection and recovery

Encryption

Data compression

File system redirection

Print redirection

COM port redirection

Multiple generic virtual channels

Cut and paste across clients and servers

General purpose Citrix server browsing

The Thinwire Virtual Channel

The thinwire protocol is an ICA virtual channel protocol used to transmit

presentation commands from Windows applications running on the application

server to the client. The thinwire protocol is highly tuned for transmission of

Windows object display over low-bandwidth connections. This is accomplished

through:

Command- and object-specific intelligent compression with state persistence;

that is, run-length encoding for bitmaps

Outboard complex clipping and complex curve drawing

Intelligent caching of Windows objects such as bitmaps, brushes, glyphs, and

pointers

Remote SaveScreenBitmaps

Cross-session persistent caching

To enable thinwire to most efficiently distribute the Windows image to the ICA

client, use the following guidelines:

Use vector graphics instead of bit-mapped images for graphics

Use the raster operator to “brush” graphics to the screen

Bitmaps require more bandwidth than vector graphics because all of the image

data for each unique bitmap must be transmitted from the server at least once. ICA

compensates for this by caching each unique bitmap on the client system. When a

bitmap is to be displayed, it is compared with the client’s locally cached bitmaps.

If the displayed bitmap matches one that is already cached at the client, ICA sends

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Adaptec 2940U - AHA Storage Controller Ultra SCSI 20 MBps Información técnica Pagina 53