DEFINITY Enterprise Communications Server Release 8.2
Upgrades and Additions for R8r
555-233-115 Issue 1
April 2000
Glossary and Abbreviations

GL-9

bridged appearance
A call appearance on a voice terminal that matches a call appearanc e on another voice terminal
for the duration of a call.
BTU
British Thermal Unit
buffer
1. In hardware, a circuit or component that isolates one electrical circuit from another. Typically, a
buffer holds data from one circuit or process until another circuit or process is ready to ac cept the
data.
2. In software, an area of memory that is used for temporary storage.
busA multiconductor electrical path used to transfer information over a common connection from any
of several sources to any of several destinations.
business communications terminal (BCT)
A digital data terminal used for business applications. A BCT can function via a data mod ule as a
special-purpose terminal for services provided b y a processor or as a terminal for data entry and
retrieval.
BX.25
A version of the CCITT X.25 protocol for data communications. BX.25 adds a fourth level to the
standard X.25 interface. This uppermost level combines levels 4, 5, and 6 of the ISO reference
model.
bypass tie trunks
A 1-way, outgoing tie trunk from a tandem switch to a main switch in an ETN. Bypass tie trunks,
provided in limite d quantities, are used as a last-choice route when a ll trunks to another tandem
switch are busy. Bypass tie trunks are used only if all applicable intertandem trunks are busy.
byte
A sequence of (usually eight) bits processed together.
C
CACR
Cancellation of Authorization Code Request
cabinet
Housing for racks, shelves, or carriers that hold electronic equipment.
cable
Physical connection between two pieces of equipment (for example, data terminal and mod em) or
between a piece of equipment and a termination field.
cable connector
A jack (female) or plug (male) on the end of a cab le. A cable connec tor connects wires on a c able
to specific leads on telephone or data equip ment.
CAG
Coverage answer group