US Robotics 56K MESSAGE MODEM - QUICK FOR WINDOWS Guía de usuario descargar pdf (Pagina 48)

56K Professional Message Modem44

digital signals

Signals that are discrete and uniform. In this manual, the term refers to

the

binary digits

0 and 1. These signals are in contrast with

analogue

signals

DTE

Data

Terminal

(or Terminating) Equipment is a computer that generates

or is the final destination of data.

duplex

Indicates a communications channel capable of carrying signals in both

directions. See

half duplex

full duplex

Electronic Industries Association (EIA)

This association is a group which defines electronic standards in the

United States.

error control

A variety of techniques that check the reliability of

characters

(

parity

) or

blocks of data.

V.42

and

MNP

error-control

protocols

use error

detection (

CRC

) and retransmission of flawed

frames

(

ARQ

facsimile

A method for transmitting the image on a page from one point to

another. This is commonly referred to as fax.

fax mode

The mode in which the faxmodem is capable of sending and receiving

files in a

facsimile

format. See definitions for

V.17, V.27ter, V.29

flow control

A mechanism that compensates for differences in the flow of data into

and out of a modem or other device. See commands

&Hn, &In, &Rn.

frame

data communications

term for a block of data with header and trailer

information attached. The added information usually includes a frame

number, block size data, error-check codes, and Start/End indicators.

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