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Microsoft KB Archive/103900

From BetaArchive Wiki
Knowledge Base

PC WRmt Ext: Telebit Modem Poor Throughput w/ 9600 Connection

Article ID: 103900

Article Last Modified on 10/30/2006


  • Microsoft Mail for PC Networks 2.1
  • Microsoft Mail for PC Networks 3.0
  • Microsoft Mail for PC Networks 3.0a
  • Microsoft Mail for PC Networks 3.2
  • Microsoft Mail Remote 3.2
  • Microsoft Mail Remote 3.0 for MS-DOS

This article was previously published under Q103900


In version 3.2 of Microsoft Mail Remote for Windows or version 2.1, 3.0, 3.0a, or 3.2 of Microsoft Mail for PC Networks, when you transmit a large amount of data using a Telebit modem with the Telebit script connecting at 9600 baud, throughput is well below that speed.

Upon connection, both modems echo "CONNECT FAST," show that the 1024x8 parameters are in use on both sides, and that the bytes received and transmitted are incremented in 1024 byte blocks. However, the receiving side is generally about 8K behind the sending side. As a result, there are long periods where both sides are waiting with no additional bytes being transmitted or received. Despite these problems, the transmission eventually succeeds.


Microsoft has confirmed this to be a problem with the Telebit Trailblazer modem using all versions of the Telebit script. We are researching this problem and will post new information here in the Knowledge Base as it becomes available.

Additional query words: 2.10 3.00 3.00a 3.20

Keywords: KB103900