Motorola 326X V.34 ユーザーズマニュアル
Glossary-3
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DTMF
Dual Tone Multi-Frequency. A signaling method used for push-button telephones that
combines two output signals to create a unique tone for each of the 12 keys.
combines two output signals to create a unique tone for each of the 12 keys.
EBCDIC
Extended Binary Coded Decimal Interchange Code. A method of coding digital signals
using eight bits to generate 256 different characters.
using eight bits to generate 256 different characters.
Echo
Reflection back to the sender of a transmitted signal (as heard on telephone circuits
involving long distances, or poor transmission facilities).
involving long distances, or poor transmission facilities).
EIA
Electronic Industries Association. The American electronics standards group.
EIA/TIA 232-D
The most commonly used computer/modem interface. An electrical standard for
interconnecting data communications equipment (DCE) and data terminal equipment (DTE)
established by EIA. (The pinout is the same as for EIA 232-C and is nearly equivalent to
ITU V.24.)
interconnecting data communications equipment (DCE) and data terminal equipment (DTE)
established by EIA. (The pinout is the same as for EIA 232-C and is nearly equivalent to
ITU V.24.)
EOT
End-of-transmission control character in character-oriented protocols (applied to BISYNC).
Tells the receiver that all user data (text) has been sent.
Tells the receiver that all user data (text) has been sent.
ETX
End-of-text control character. Tells the receiver that the end of a message has been reached.
Exclusion key
telephone
telephone
Allows calls to be answered manually and transferred to the modem using an integral
exclusion key.
exclusion key.
Fallback
Switching the data system to a lower transmission speed either for reduced traffic during
off-peak hours or because of distortion in the telephone system.
off-peak hours or because of distortion in the telephone system.
Fall forward
Switching from a lower to a higher data rate.
Flow control
Controls data transfer between endpoints in a data network; line signals or flow control
characters stop and start the flow of data.
characters stop and start the flow of data.
Four-wire
A circuit containing two pairs of wires, one pair for each transmission direction.
Full-duplex
A signaling circuit that allows simultaneous 2-way transmission and reception.
Frame
A group of bits transmitted serially over a communications channel. The basic data
transmission unit used with bit-oriented protocols.
transmission unit used with bit-oriented protocols.
Gain
The amount by which an amplifier (or power) increases the amplitude of a signal passing
through it; often represented in dB.
through it; often represented in dB.
Half-duplex
A circuit that allows alternating transmit and receive signals, but not both simultaneously.
HDLC
High-level data link control. ITU-specified, bit-oriented, data-link control protocol; any
related control of data links by specified series of bits rather than by control characters.
related control of data links by specified series of bits rather than by control characters.
Hexadecimal
Base 16 number system with digits ranging from 0 to F.
ITU. See CCITT
International Telecommunications Union. Formerly CCITT.
ITU -T
Telecommunication Standardization Sector of ITU.
ITU V.13
V.13 signaling allows your modem to communicate with non-Motorola modems. This
signaling operates when the modem is configured for synchronous mode.
signaling operates when the modem is configured for synchronous mode.
ITU V.22 bis
2400 bps modem standard for use with dial and leased-line circuits.