3Com 155 PCI manual Vbr

GLOSSARY 5

SONET

Synchronous Optical Network. A growing body of standards that defines all aspects of transmitting and managing digital traffic over optical (fiber) facilities.

STS-3c

Synchronous Transport Signal, Level 3 Concatenated.

SVC

Switched Virtual Circuit. Circuit that 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 Mbps or a 16 Mbps 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 2-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.