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iSPAN Serial WAN Adapter Users Guide 195
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 (Logical Link Control)
within the Data Link layer of the OSI model. LLC frames carry user
information between the nodes on a network and define the transmis-
sion 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 (Car-
rier 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
connects 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.