Paradyne 3800PLUS manual over the leased-line network

COMSPHERE 3800Plus Modems

automatic dial backup	When leased-line operation fails, this function forces the modem to dial the telephone
	number stored in directory location 1; communication over the dial network continues
	with the remote modem. For a 3800Plus modem to perform this properly, the telephone
	number in directory location 1 must be the telephone number at the remote site. Also, the
	Auto Dial Backup configuration option in one modem must be enabled while the other
	modem must have the Auto Answer Ring Number configuration option enabled.
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.
backbone network	The primary route from a control modem to its first tributary when the communications
	network contains extended controls.
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.
bis	Latin for ªtwice.º Used to distinguish the second version of a standard from other
	versions; e.g., V.32bis.
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.
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.
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	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. Up to 16 modems can be installed per carrier, with
	6 carriers per cabinet.
CCITT	An advisory committee (Consultative Committee on International Telephone and
	Telegraph) established by the United Nations to recommend communications standards
	and policies. Now called ITU-T.

Glossary-2 November 1996 3980-A2-GB30-20