Displaylink Protocol
DisplayLink produces a system to connect monitors to computers through a universal serial bus (USB) 2.0 cable. It has its own data protocol to transfer data over this cable. This is the DisplayLink protocol.
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Features
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The DisplayLink protocol is a proprietary system the company keeps secret. However, the necessity of resolving problems with installations, and outright curiosity, has induced a number of technicians to analyze and document the standard.
System
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Although DisplayLink operates over short distances of cable within a premises, the communication between monitor and PC is encrypted. The system used for this encryption is called linear feedback shift register (LFSR). Data is compressed using a Huffman sequence. The Huffman sequence relies on a decoding table transmitted for each screen shot.
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Basis
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DisplayLink sends each screen shot in two blocks. The first block is a black background, the second contains the colors.
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References
- Photo Credit computer image by Orlando Florin Rosu from Fotolia.com
