Microsoft KB Archive/97977

= RAS and Telebit PEP =

Article ID: 97977

Article Last Modified on 10/31/2006



This article was previously published under Q97977



SUMMARY
It is recommended that you do not use Telebit's proprietary PEP compression method with Microsoft Remote Access Service (RAS). It will actually slow down data throughput rates with RAS.



MORE INFORMATION
PEP is a method implemented in some Telebit modems to get higher data throughput over slower DCE rate. Using a normal terminal for file transfer over a 9600 bps PEP connection, you may actually get DTE throughput closer to 19,200 bps. RAS is more of an interactive application that both sends and receives smaller packets of data. A PEP connection with RAS is actually much slower than a non-PEP connection at the same DCE bps. The reason is that PEP holds back small packets of data to compress them when more packets of data come from the system. This has the effect of holding back NBFs\AsyBEUIs acknowledgment frames. Hence, frames are resent, timeouts occur, and in general things slow down. A straight 9600 bps connection without PEP is actually faster for RAS.

Additional query words: 2.20 v.42bis mnp 5 1.1 1.0 3.1 error correction data compression.

Keywords: KB97977

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