US Robotics COURIER Manuel d'utilisateur télécharger pdf (Page 127)

U.S. Robotics I-modem Command Reference

Handshaking, Error Control, Data Compression, and Throughput • Page 11-18

Getting Maximum Throughput

The following guidelines should help you to make the most of the I-modem's advanced

performance features. In many instances, experimentation and experience will indicate

what works best for your applications.

Maximum throughput results when:

¥ The communications software allows Þxing the serial port rate higher than the connec-

tion rate by setting the soft-ware to 230400, 115200, 57600, or 38400 bps and setting the

I-modem to &B1.

If the software automatically switches serial port rates to follow the connection rate, the

I-modem's serial port rate must be also set to follow the connection rate for each call

(&B0) and throughput will be limited.

Installations with specialized software may want to enable a Þxed serial port rate for

ARQ calls and a variable serial port rate for non-ARQ calls. (See the &B2 command in

Chapter 7, Controlling Data Rates

¥ The call is under data compression.

¥ The data is made up of text Þles rather than binary Þles such as .EXE or .COM Þles.

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US Robotics COURIER Manuel d'utilisateur Page 127