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DEFINITY ECS Release 8.2
Administrator’s Guide
555-233-506
Issue 1
April 2000
Glossary and abbreviations
1620
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 accept the data.
2. In software, an area of memory that is used for temporary storage.
bus
A 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 module as a special-pur-
pose terminal for services provided by 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
limited quantities, are used as a last-choice route when all 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
cabinet
Housing for racks, shelves, or carriers that hold electronic equipment.
cable
Physical connection between two pieces of equipment (for example, data terminal and modem) or between a
piece of equipment and a termination field.
cable connector
A jack (female) or plug (male) on the end of a cable. A cable connector connects wires on a cable to specific
leads on telephone or data equipment.
CACR
Cancellation of Authorization Code Request
CAG
Coverage answer group
call appearance
1. For the attendant console, six buttons, labeled a–f, used to originate, receive, and hold calls. Two lights next
to the button show the status of the call appearance.
2. For the voice terminal, a button labeled with an extension and used to place outgoing calls, receive incom-
ing calls, or hold calls. Two lights next to the button show the status of the call appearance.
call-control capabilities
Capabilities (Third Party Selective Hold, Third Party Reconnect, Third Party Merge) that can be used in either
of the Third Party Call Control ASE (cluster) subsets (Call Control and Domain Control).