Digicom 3911 Baud, Bell 103J, Bell 212A, Bisync, Bit, Bps, Broadcast, Buffer, Byte, Carrier

COMSPHERE 3900 Series Modems

baud	A unit of signaling speed that is equal to the number of symbols per second. This is not
	necessarily the same as bits per second, although the terms are frequently interchanged.
Bell 103J	A standard for 300 bps data transmission.
Bell 212A	A standard for 1200 bps data transmission.
bis	Latin for twice. Used to distinguish the second version of a standard from other versions; e.g.,
	V.32bis.
bisync	Binary synchronous communications. An IBM communications protocol that has become an
	industry standard. It uses a defined set of control characters and control-character sequences
	for synchronized transmission of binary-coded data between stations in a data communications
	system.
bit	Binary digit. The smallest unit of information, representing a choice between a one or a zero
	(sometimes called mark or space).
bps	Bits per second. Indicates the speed at which bits are transmitted across a data connection.
broadcast	A method of transmission. The simultaneous transmission to two or more communicating
	devices.
buffer	A temporary storage area used to compensate for differences in data flow rate when transmitting
	data from one device to another.
byte	A sequence of successive bits (usually eight) handled as a unit in data transmission.
Call Setup	Top-Level menu branch that contains all the functions necessary to dial telephone numbers
	stored in directory locations, answer incoming calls, disconnect calls, and save telephone
	numbers to directory locations.
carrier	A continuous frequency signal that can be modulated by another signal that contains information
	to be transmitted.
carrier-mounted	A device that is designed for installation in a COMSPHERE 3000 Series Carrier and used at
	central-site operations. Up to 16 devices can be installed per carrier, with six carriers per cabinet.
CCITT	Consultative Committee on International Telegraphy and Telephony. An advisory committee
	established by the United Nations to recommend communications standards and policies. It was
	renamed ITU in March 1993.
channel	A bidirectional voice, or data path for electrical transmission between two or more points. Also
	called a circuit, line, link, path, or facility.
character	A letter, figure, number, punctuation, or other symbol.
character echo	A way to check the accuracy of data transmission by sending (displaying) all the characters
	being transmitted to the monitor.
circuit pack lock	A screw lock tab installed over a circuit card’s latch release tab to prevent the unit from being
	removed without a tool.
Command mode	One of two modem operating modes. When in Command mode, the modem accepts commands
	instead of transmitting or receiving data.
configuration area	One of five areas within the Configure branch containing modem settings. Configuration areas
	include Active (Operating), Active (Saved), Customer 1, Customer 2, and Factory.
configuration option	Device software that sets specific operating parameters for the device. Sometimes referred to as
	straps.
Configure	Top-Level menu branch that contains all the device’s configuration options.
connector	An outlet on equipment and cables that provides a connection.

Glossary-2 September 1998 3910-A2-GN32-40