US Robotics COURIER Instrukcja Użytkownika Pobierz pdf (Strona 123)

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U.S. Robotics I-modem Command Reference

Handshaking, Error Control, Data Compression, and Throughput • Page 11-14

&M6 Start V.25bis synchronous mode, using a character-oriented link protocol

similar to BISYNC. (External I-modems only.)

&M7 Start V.25bis synchronous mode, using the HDLC link protocol. (External

I-modems only.)

Data Compression

I-modems employ different data compression techniques during analog and TurboPPP

(digital) connections.

TurboPPP

When a call uses TurboPPP, the I-modem supports three kinds of compression: Ascend,

Microsoft, and Stac. Compression is available only when the remote device requests one

of the three supported compression types.

Compression for TurboPPP calls is controlled by the &K command. By default, compres-

sion is enabled. Set &K0 to disable compression.

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