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O
G
PERATION
LOSSARY
A port
In FDDI technology, each DAS contains two ports: A and B. The A port is
connected to the primary ring on the incoming fiber and the secondary
ring on the outgoing fiber. A properly formed trunk ring is composed of a
set of stations with the A port of one station connected to the B port of the
neighboring station. See also B port.
ANSI
American National Standards Institute. ANSI, the primary group that defines
computer communication standards in the United States, developed the
Fiber Distributed Data Interface (FDDI) standard.
AppleTalk® protocol
Apple Computer Corporation's networking specifications for the physical
layer (LocalTalk®, EtherTalk®, and TokenTalk®), network and transport
functions (Datagram Delivery Protocol and AppleTalk Session Protocol),
addressing (Name Binding Protocol), file sharing (AppleShare®), and remote
access (AppleTalk Remote Access).
application layer
The uppermost layer of the OSI model and the only layer with which users
can communicate directly. Users interact with the application layer through
e-mail, and file transfer, and other services. See also OSI.
ATM
Asynchronous Transfer Mode. A transfer method used by Broadband ISDN.
ATM carries voice, video, and data at speeds up to 2.2 Gbps and can
integrate geographically distant disparate networks. Also called cell relay.
ATM Adaption Layer
A set of protocols that translate higher-layer protocols into ATM format.
(AAL)
ATM Forum
A consortium of vendors, carriers, and users formed to expedite industry
agreement on ATM interfaces.
ATM Layer
The part of the BISDN protocol stack that handles most of the ATM routing
and processing.
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