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61202.086L1-1 ISU 512 User Manual 99
Glossary
2 B+D
The basic rate interface (BRI) in ISDN. A single ISDN circuit divided into two 64
kbps digital channels for voice or data and one 16 kbps channel for low speed data
(up to 9,600 baud) and signaling. 2B+D is carried on one or two pairs of wires de-
pending on the interface, the same wire pairs that today bring a single voice circuit
into your home or office. See ISDN.
2B1Q
Two binary, one quarternary. An ISDN line encoding technique which uses two
bits to represent four variations in amplitude and polarity.
asynchronous transmission
Not synchronous. A method of data transmission which allows characters to be
sent at irregular intervals by preceding each character with a start bit and follow-
ing it with a stop bit. The timing of the transmission is not determined by the tim-
ing of a previous character. Applications include communication between most
small computers (especially PCs) and mainframes, lower speed transmission, and
less expensive computer transmission systems. See synchronous.
B channel
64 kbps bearer channel used for voice, circuit, or packet switched data.
bearer service
As defined by CCITT standards, a type of telecommunication service that provides
the capability for the transmission of information between user-to-network inter-
faces. Bearer services defined for ISDN are circuit mode and packet mode.
BONDING protocol
Industry standard B channel aggregation protocol. Developed by the Bandwidth
on Demand Interoperability Group.
bridging
The technique whereby additional stations may be served from a two-point facility
by extending the facility from a bridge at one of the facility’s terminating points.