Glossary - Avaya DEFINITY Manual

Glossary

ASAI Port
A logically unique access for ASAI services from the DEFINITY system. This port is differentiated
via an extension number and via a physical port number assignment.
B
Basic Rate Interface (BRI)
One of two interfaces within ISDN, the other being PRI. BRI provides two bearer B-channels at 64
KB per second and a data D-channel at 16 KB per second. The bearer B-channels are designed
for PCM (pulse code modulation) voice, video conferencing, group 4 fax machines, etc., while the
data D-channel function is to bring in information about incoming calls and take out information
about outgoing calls.
Baun
On the DEFINITY LAN Gateway connection, the adapter needed to connect the twisted-pair brea-
kout cable to the coaxial building wire distribution system.
BIOS
Basic Input Output System. Firmware resident in a PC system which maps a given hardware real-
ization into a standardized software interface (interrupts, I/O addresses, etc.) and which also pro-
vides for diagnostic and testing functions for the hardware including testing of peripheral devices.
BIST
Built in Self Test. Functions available in some device designs which allow the said devices to self
test.
Boot
The operation to start a computer system by loading programs from disk to main memory (booting
is part of system initialization).
Bridge
A router that connects two or more networks and forwards packets among them. Usually, bridges
operate at the physical network level, for example, an Ethernet bridge connects two physical Ether-
net cables and forwards from one cable to the other exactly those packets that are not local.
Bridges differ from repeaters because bridges store and forward complete packets while repeaters
forward electrical signals. See BRouter.
Brouter
Bridge/Router. In local area networking, a device that combines the dynamic routing capability of
an internetwork router with the ability of a bridge to interconnect dissimilar LANs. It has the ability
to route one or more protocols and bridge all other traffic. The DEFINITY LAN Gateway application
links ISDN and TCP/IP at both a physical and addressing level. See bridge and router.
Business Communications Terminal (BCT)
The recommended terminal for system maintenance and administration.
C
Call Reference Value (CRV)
An identifier present in ISDN messages that associates a related sequence of messages. In ASAI,
the CRVs distinguish between associations.
GL-2
Issue 2 November 2001