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5536 PRI RAS Communications Controller Users Guide 201
Glossary
2B+D See BRI (Basic Rate Interface).
23B+D See PRI (Primary Rate Interface).
30B+D See PRI (Primary Rate Interface).
802.2 IEEE Standards that govern the LLC within the Data Link
layer of the OSI model. LLC frames carry user information between
the nodes on a network and define the transmission of a frame between
two stations. These standards are common across the various lower
level standards within the Data Link and the Physical layers.
802.3 IEEE Standards that govern the use of the CSMA/CD (Carrier
Sense Multiple Access/Collision Detection) network access method
used by Ethernet networks.
802.5 IEEE Standards that govern the use of the token ring indicator
and frame priority.
Adapter A device, usually a user interface card, that physically con-
nects an end station to the network medium (for example, twisted pair,
coaxial, fiber).
Advanced program-to-program communication See APPC.
AIS (Alarm Indication Signal) PRI alarm, also known as Keep
Alive or Blue signal.
AMI (Alternate Mark Inversion) A method of digitally encoding
data as electrical signals on a link.
ANSI (American National Standards Institute) An organization
which coordinates, develops, and publishes standards used in the
United States.
APPC Advanced Program-to-Program Communications.The gen-
eral facility characterizing the LU 6.2 architecture and its various
implementations in products. 2. Sometimes used to refer to the LU 6.2
architecture and its product implementations as a whole, or to an LU
6.2 product feature in particular, such as an APPC application pro-
gramming interface.