US Robotics COURIER Manual de usuario descargar pdf (Pagina 120)

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U.S. Robotics I-modem Command Reference

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

Error control is available for calls at 1200 bps and above. It can be disabled, although

high-speed analog calls (9600 bps or higher) should always be under error control. The

operations deÞned in an error-control protocol include:

¥ Establishing compatibility.

¥ Formatting data frames.

¥ Detecting errors using Cyclic Redundancy Checking (CRC).

¥ Retransmitting corrupt data frames.

The I-modem is set at the factory to &M4, causing it to try for an error-control connection

and, if that isn't possible, to proceed with the call in Normal mode.

The I-modem Þrst tries for a V.42 connection, then an MNP connection. The following

information is based on the I-modem's setting of &M4.

V.42 Error Control

This international standard includes a two-stage hand-shaking process:

¥A Detection phase that is based on an exchange of predeÞned characters.

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