Paradyne 392xPLUS Automatic dial standby, Automatic rate control, Backbone network, Backplane

COMSPHERE 392xPlus Modems

automatic dial standby	When operating in Dial Backup mode, this function forces the modem to periodically
	check the quality of the leased line. If the leased line is found to be at normal operating
	condition, the modem disconnects from the dial network and continues normal operation
	over the leased-line network.
automatic rate control	Modems adjust their signaling rate based on current line conditions.
backbone network	The primary route from a control modem to its first tributary when the communications
	network contains extended control modems.
backplane	A common bus at the rear of the COMSPHERE 3000 Series Carrier connecting each
	circuit card slot to the SDCP and/or SDU. It also distributes low-voltage ac power to
	each slot.
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.
Bisync	Binary Synchronous Communications. An IBMr 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	A contraction of binary digit. A bit, which is the smallest unit of information, represents
	the 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 storage device used to compensate for differences in the 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.
carrier	The rack mounting that contains 17 slots: 1 control slot for an SDU and 16 modem slots.
	See data carrier.
carrier-mount	A modem that is designed for installation in a COMSPHERE 3000 Series Carrier and
	used at central-site operations.
CCITT	An advisory committee (Consultative Committee on International Telephone and
	Telegraph) established by the United Nations to recommend communications standards
	and policies.
channel	A 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 to the monitor (displaying)
	all the characters being transmitted.

Glossary-2 November 1996 3920-A2-GN31-30