3Com CoreBuilder 7000 Installation & Start?Up Manual page 139

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139
LOSSARY
SVC Switched Virtual Connection. A standard signaling protocol that
automatically defines connections as they are needed, and discards
them when complete.
switched virtual LAN A logical network consisting of several different LAN Emulation
domains controlled through an intelligent management application.
switching module A CoreBuilder 7000 switching module found in the slot just under the
power supply. An additional switching module can be used for
redundancy. The switching module contains a control port, a
management port and a service port.
Port that has been synchronized according to the external clock
synched external
supported by the external clock source port. Only on-board 8-port ports
clock port
can function as synched ports. Ports that are to be synched should be
configured to internal clock mode.
T
The database that describes the topology of the entire PNNI routing
topology database
domain as seen by a node.
topology The physical or logical placement of stations on a network in relation to
one another.
traffic management The aspect of the traffic control and congestion control procedures for
ATM. ATM layer traffic control refers to the set of actions taken by the
network to avoid congestion conditions. ATM layer congestion control
refers to the set of actions taken by the network to minimize the
intensity, spread and duration of congestion.
U
Unspecified Bit Rate. UBR is an ATM service category which does not
UBR
specify traffic related service guarantees. Specifically, UBR does not
include the notion of a per-connection negotiated bandwidth. No
numerical commitments are made with respect to the cell loss ration
experienced by a UBR connection, or as to the cell transfer delay
experienced by cells on the connection.
UNI User-Network Interface. An interface point between ATM end users and
a private ATM switch, or between a private ATM switch and the public
carrier ATM network defined by physical and protocol specifications per