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Glossary
Avaya C460 Reference Guide 245
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 244.
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 244.
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 244.
HDX
Half Duplex. 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 244.
Hop
Passage of a data packet between two network nodes (for example, between two
routers).