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Glossary
200 Avaya P460 Reference Guide
FCS
Frame Check Sequence. A field added to a frame for error-control purposes.
FDDI
Fiber Distributed Data Interface. A set of ANSI protocols for sending digital data
over fiber optic cable. FDDI networks are token-passing networks, and support data
rates of up to 100 Mbps. FDDI networks are typically used as backbones for wide-
area networks.
FDX
Full Duplex. A circuit or device permitting simultaneous data transmission between
sending and receiving stations. For more information, refer to Duplex Mode on
page 199.
Flow Control
Avaya’s devices use a proprietary form of flow control that enables one endpoint to
inform another endpoint that it should refrain from sending additional packets. The
flow control mechanism avoids packet loss. Flow control is used in Full Duplex
Mode.
Fragment
Ethernet packet shorter than 576 bits (usually the result of a collision).
Frame
A logical grouping of information sent as a Data Link Layer unit over a transmission
medium. The word Frame often refers to the header and trailer, used for
synchronization and error control, that surround the user data contained in the unit.
FTP
File Transfer Protocol. An application protocol, part of the TCP/IP protocol stack,
used for transferring files between network nodes.
Full Duplex (FDX)
A circuit or device permitting simultaneous data transmission between sending and
receiving stations. Duplex Mode on page 199.
Half Duplex (HDX)
A circuit or device permitting data transmission in only one direction at a time
between sending and receiving stations. For more information, refer to Duplex
Mode on page 199.
HDX
Half Duplex. A circuit or device permitting data transmission in only one direction