US Robotics COURIER Instrukcja Użytkownika Pobierz pdf (Strona 129)

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101

U.S. Robotics I-modem Command Reference

Handshaking, Error Control, Data Compression, and Throughput • Page 11-20

The protocols listed above further reduce throughput when an error control connection is

established. The accuracy of the data is checked both by the File Transfer Protocol and

the I-modem. To avoid redun-dancy, use the above protocols only for non-ARQ connec-

tions, and only at speeds of 2400 bps and below.

Overhead is minimal with ZMODEM

, resulting in throughput that is almost equal to that

obtained with no File Transfer Protocol. ZMODEM should also be used for non ARQ

connections. Leave the I-modem at its &M4 and &K1 settings for both error control and

data com-pression.

YMODEM

-G is another good choice, but never use it unless both the local and remote

devices are using error control: if YMODEM-G detects an error, it aborts the transfer.

Do not use either pr

otocol with software ßow control (XON/XOFF signaling).

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