Data compression in the V.42bis modems

A. Lettieri, K. Holtz, E. Holtz
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Abstract

A first international data compression standard became available when the CCITT adopted the V.42bis. standard in 1990. The standard is now used by more than 50 modem manufacturers and is rapidly,spreading into Local and Remote Area Networks (LANs, WANs). Follow-on standards now being developed (such as V.34 or V.fast) use the same data compression method in different communications protocols. British Telecom developed the V.42bis standard by combining a variety of inventions and ideas into a standard called BLTZ (British Telecom Lempel Ziv). Data compression is based on tree libraries invented by Holtz in 1974, which Welch modified in 1984 into the LZW codes. British Telecom added "Delayed Innovation" and a limited recycling library. A built-in microprocessor monitors the compression ratio, switching compression on or off using IBM's "Escape Character" sequences. The output codes are stuffed into 8 bit octets and combined into packets which include error checking codes. Defective packets are re-transmitted automatically, ensuring error free data transmission.<>
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数据压缩在V.42bis调制解调器
当CCITT采用V.42bis时,第一个国际数据压缩标准成为可能。1990年的标准。该标准目前已被50多家调制解调器制造商采用,并迅速推广到本地和远程区域网络(LANs, wan)。现在正在开发的后续标准(如V.34或V.fast)在不同的通信协议中使用相同的数据压缩方法。英国电信通过将各种发明和想法结合成一个称为BLTZ(英国电信Lempel Ziv)的标准,开发了V.42bis标准。数据压缩基于Holtz在1974年发明的树形库,Welch在1984年将其修改为LZW代码。英国电信增加了“延迟创新”和一个有限的回收图书馆。内置微处理器监控压缩比,使用IBM的“转义字符”序列打开或关闭压缩。输出代码被塞进8位字节组,并组合成包含错误检查代码的数据包。故障报文自动重传,保证无差错数据传输
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