ZyXEL Communications 56K manual Arq, Ascii, Ccitt

	User's Guide for ZyXEL Omni 56K USB Modem
	Glossary
Analog	An electrical circuit that is represented by means of continuous, variable physical quantities
	(such as voltages and frequencies), as opposed to discrete representations (like the 0/1,
	off/on representation of digital circuits).
Analog Loopback	Testing method in which the modem’s analog signal is connected to the analog input.
Test
Answer	In a connection between two modems, one modem works as the recipient (in answer mode)
	and the second modem as the initiator (originate mode).
Architecture	A design. The term architecture can refer to either hardware or software, or to a
	combination of hardware and software. The architecture of a system always defines its
	broad outlines, and may define precise mechanisms as well.
ARQ	Automatic Retransmission reQuest – standardized method in error control protocols.
ASCII	American Standard Code for Information Interchange. This code assigns a 7-bit numerical
	value to characters, digits and control characters. An ASCII character is a 7-bit character
	with a decimal value ranging from 0 to 127.
Asynchronous	Data transfer method in which a character's data bits are framed by additional bits (start bit,
	parity bit and stop bit). There are variable idle times between characters.
AT Command	The commands used with an intelligent modem. Every command line is started with the
	AT prefix (ATtention). To send an AT command to a modem, you must have
	communications software running.
Authenticity	Proof that the information came from the person or location that reportedly sent it. One
	example of authenticating software is through digital signatures.
Auto-answer	Modem's ability to automatically answer a call after a set number of rings.
Backbone	A high-speed line or series of connections that forms a major pathway within a network.
Bandwidth	This is the capacity on a link usually measured in bits-per-second (bps).
bis	Old French word for two.
Bit	(Binary Digit) – A single digit number in base-2, in other words, either a one or a zero. The
	smallest unit of computerized data.
Bit Rate	Count of data bits transmitted per time unit. The framing bits needed for asynchronous
	transfer are also counted in the calculation of the bit rate. In general, the bit rate is ten times
	the character rate.
bps	Unit of measurement. Bits per second.
Byte	A set of bits that represent a single character. There are 8 bits in a Byte.
Carrier	The carrier is a modulated tone and is used by the modem to transfer the data.
CCITT	Comité Consultatif International Thonique et Traphique; former name for the ITU-TSS
	(ITU-T), the international standard making organization for telecommunications.
CD	See DCD.

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