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Sportster Winmodem 33600 & x2/56K - User's manual 63
Data mode
Mode in which the fax/modem can send and receive data files.
A standard modem without facsimile capabilities is always in
data mode.
DCE
(Data Carrier Equipment) Termination equipment of the data
circuit. In this manual, this term applies to modems that establish
and control the data link on the telephone network.
Digital signals
Discreet and uniform signals. In this manual, the term refers to
bits 0 and 1.
DTE
(Data Terminal Equipment) Data processing terminal equipment.
Generally, a computer or terminal generates data or is the final
destination of data.
Duplex
Defines a communications channel capable of transmitting
signals in both directions (half duplex or full duplex).
Full duplex: Simultaneous flow of signals in two directions. In
micro-computer communications, full duplex can refer to
suppressing the local echo of transmitted characters..
Half Duplex: Signal flow in two directions, but only in one at a
given time. In micro-computer communications, half duplex can
refer to enabling of the local echo that causes the modem or the
software to send a copy of transmitted data to the screen of the
transmitting computer.
Error correction
Various techniques that check the reliability of the characters or
data blocks. The V.42 and MNP2-2, 10 error correction
protocols use error detection (using a CRC type control code)
and re-transmit erroneous frames (ARQ).