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g-4
GLOSSARY
a common protocol. Bridges can usually be made to filter certain packets (to
forward only certain traffic).
Broadband - a service or system requiring transmission channels capable of
supporting rates greater than the Integrated Services Digital Network (ISDN)
primary rate.
Broadband Access - an ISDN access capable of supporting one or more
broadband services.
Brouter (bridging/router) - a device that routes some protocols and bridges
others based on configuration information.
BUS (Broadcast and Unknown Server) - in an emulated LAN, the BUS is
responsible for accepting broadcast, multicast, and unknown unicast packets
from the LECs to the broadcast MAC address (FFFFFFFFFFFF) via dedicated
point-to-point connections, and forwarding the packets to all of the members
of the ELAN using a single point-to-multipoint connection.
CAC (Connection Admission Control) - the procedure used to decide if a
request for an ATM connection can be accepted based on the attributes of both
the requested connection and the existing connections.
Call - an association between two or more users or between a user and a net-
work entity that is established by the use of network capabilities. This associ-
ation may have zero or more connections.
CBR (Constant Bit Rate) - a type of traffic that requires a continuous, specific
amount of bandwidth over the ATM network (e.g., digital information such
as video and digitized voice).
cchan - a FORE program used to manage virtual channels on a FORE Systems
ATM switch running asxd.
CCITT (International Telephone and Telegraph Consultative Committee) -
the international standards body for telecommunications.
CDV (Cell Delay Variation) - a quantification of cell clumping for a connec-
tion. The cell clumping CDV (y
k
) is defined as the difference between a cell’s
expected reference arrival time (c
k
) and its actual arrival time (a
k
). The
expected reference arrival time (c
k
) of cell k of a specific connection is
max . T is the reciprocal of the negotiated peak cell rate.
CE (Connection Endpoint) - a terminator at one end of a layer connection
within a SAP.
CEI (Connection Endpoint Identifier) - an identifier of a CE that can be used
to identify the connection at a SAP.
Cell - an ATM Layer protocol data unit (PDU).
c
k 1–{}
Ta
k
,+[]