US Robotics COURIER Bedienungsanleitung PDF herunterladen (Seite 271)

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101

U.S. Robotics I-modem Command Reference

Glossary • Page G-13

CSD

See circuit-switched data.

CSV

See circuit-switched voice.

CSV/D

Alternating circuit-switched voice and data. See circuit-switched voice and circuit-

switched data.

ÒCustomÓ

AT&TÕs call-control signaling protocol that was implemented before the advent of NI-1.

cyclic redundancy check (CRC)

An error-detection technique consisting of a cyclic algorithm performed on each block or

frame of data by both sending and receiving modems. The sending modem inserts the

results of its computation in each data block in the form of a CRC code. The receiving

modem compares its results with the received CRC code and responds with either a posi-

tive or negative acknowledgment. In the ARQ protocol

imple-mented in U.S. Robotics

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