Robotics Sportster Flash x2 Betriebsanweisung PDF herunterladen (Seite 42)

38 Sportster Flash x2 - User’s Guide

Half Duplex

Signal flow in both directions, but only one way at a time. In

microcomputer communications, may refer to activation of the on-line

Local Echo, which causes the modem to send a copy of the

transmitted data to the screen of the sending computer.

Hertz, a frequency measurement unit used internationally to indicate

one cycle per second.

ITU-T

An international organisation that defines standards for telegraphic and

telephone equipment. For example, the Bell 212A standard for 1200-

bps communication in North America is observed internationally as

ITU-T V.22. For 2400-bps communication, most U.S. manufacturers

observe V.22 bis. The initials ITU-T represent the ‘International

Telecommunications Union - Telecommunications sector’.

LAPM

Link Access Procedure for Modems, an error-control protocol defined

in ITU-T Recommendation V.42. Like the MNP protocols, LAPM uses

cyclic redundancy checking (CRC) and retransmission of corrupted data

(ARQ) to ensure data reliability.

Local Echo

A modem feature that enables the modem to display keyboard

commands and transmitted data on the screen. See command Hn.

MNP

Microcom Networking Protocol, an error-control protocol developed by

Microcom, Inc., and now in the public domain. There are several

different MNP protocols, but the most commonly used one ensures

error-free transmission through error detection (CRC) and

retransmission of errored frames.

Modem

A device that transmits/receives computer data through a

communications channel such as radio or telephone lines. It also

changes signals received from the phone line back to digital signals

before passing them to the receiving computer.

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Robotics Sportster Flash x2 Betriebsanweisung Seite 42