Motorola and V.32bis, V.34-SDC, 326X V.34 manual Crc

Glossary

Busy out	An indication to a Central Office that a subscriber line is not available to answer incoming
	calls. The availability and implementation of Busy Out varies by country.
Byte	An 8-bit sequence of binary digits (bits) taken as a single unit by a computer.
CCITT. See ITU.	Consultative Committee on International Telephone and Telegraph. International data
	communications standards group.
Character	A group of bits used to represent one digit, letter, or symbol (often in 7- or 8-bit groups).
Character-oriented	A communications protocol that carries control information encoded in fields of one or
	more characters. Compare with Bit-Oriented.
Control characters	In data communications, any additional transmitted characters that control or facilitate data
	transmission between data terminals.
CRC	Cyclic Redundancy Check. A BCC error-checking mechanism for link-level data
	transmission.
Crossover cable	Special DTE/DCE interface cable that reassigns signals from specific pins, thus allowing
	normal data transfer between two DTEs or two DCEs at the same site.
CTS	Clear To Send. The signal passed from the local modem to the local terminal when the data
	port is ready to transmit data. Usually occurs in response to Request To Send (RTS).
Data compression,	See Synchronous Data Compression.
synchronous
dB	Decibel. A unit used to express relative difference in power between acoustic or electric
	signals, equal to ten times the common logarithm of the ratio of the two power levels. An
	increase of 3 dB is equal to doubling the power; a decrease of 3 dB is equal to halving the
	power.
dBm	A measure of power in communications: the decibel referenced to one milliwatt into a
	600-ohm load (0 dBm = 1 milliwatt).
DCD	Data Carrier Detect. Also known as the Received Line Signal Detector (RLSD). This signal
	is passed from a local modem to a local DTE when an acceptable carrier signal is received
	by the modem over the telephone line.
DCE	Data Communications Equipment. A modem or other data transmission device.
Demodulation	In data communications, retrieval of an original digital data signal from a modulated analog
	signal.
Digital signal	The binary 0 (off) and 1 (on) output of a data terminal. Modems convert digital signals into
	analog waves for transmission over conventional telephone lines.
DSR	Data Set Ready. This signal is passed from the local modem. Indicates that the local modem
	is ready to enter the data transmission phase.
DTE	Data Terminal Equipment. End user devices that generate or receive data and that provide
	data communications control functions. Examples include: central processing units (CPUs),
	front-end processors (FEPs), high-speed multiplexers, PCs, user terminals, and so on.

2-Glossary