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Using Compression in TurboPPP mode
Courier I-modem supports the following three types of compression
modes in TurboPPP.
Pass-through Compression
Pass-through compression allows the terminal applications running on
each PC on both ends of the connection to perform compression. Using
this form of compression, the Courier I-modem does not perform
compression.
Pass-through compression allows for maximum compression by
eliminating the serial port bottleneck.
Auto Mode Compression
Auto Mode Compression allows the I-modem to negotiate compression if
your application cannot negotiate compression. This is the default.
Turbo Mode Compression
Turbo Mode Compression allows the I-modem to negotiate compression
with the remote host and disable compression between the I-modem and
your application.
Setting Modes of Compression
Use the following *K settings to use compression in TurboPPP mode:
Use this mode of compression
Pass-through Mode
Auto Mode (Default)
Turbo Mode
U.S. Robotics recommends that you enable the compression in your
application software and keep compression set to &K1 (default).
Note: Under Auto Mode Compression (&K1), the I-modem allows your
application to negotiate compression. If you have enabled compression in
your application and the application successfully negotiates compression,
then the I-modem switches to Transparent Mode compression and allows
your application do data compression.
11-6
Use this setting
*K0
*K1
*K2
Courier I-modem Getting Started Guide
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