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GLOSSARY 7
STM-1
Synchronous Transfer Mode, level 1. A European
standard defining a signal with a data rate of
155.52 Mbps.
SVC
Switched Virtual Circuit. Creates a dynamic
connection between two network nodes. SVCs are
created “on demand” and are torn down upon
completion of the data transfer.
TCP/IP
Transmission Control Protocol/Internet Protocol.
Network architecture standard for internetworking
multiple organizations. The TCP/IP protocol stack is
dominant in academic and research sites, and is the
standard protocol for the Internet.
Token ring
A 4 megabit per second or a 16 megabit per second
network using a ring topology and a token-passing
access method.
VBR
Variable Bit Rate. The transmission of data bits at
varying rates over a network.
VCI
Virtual Circuit Identifier. A two-byte field in an ATM
cell header that, when combined with the VPI (Virtual
Path Identifier), makes up an ATM address.
Virtual circuit (virtual channel)
A “logical transmission path” or connection between
two network endpoints.
Virtual path
A group of virtual circuits that connect two network
devices.