OPERATION GLOSSARY3
EthernetA CSMA/CD, 10Mbps, local area data network, developed by Digital
Equipment Corp., Intel, and Xerox Corporation. It is one of the most popular
baseband LANs in use.
Express switchingA positive Ţltering algorithm that automatically learns the addresses of
stations attached to each Ethernet port and forwards only packets
speciŢcally destined for learned stations. This operational mode of the
Switch 2200 eliminates super�uous trafŢc created by the �ooding that
results from IEEE 802.1d address learning and aging.
FDDIFiber Distributed Data Interface. A high-performance, Ţber optic token ring
LAN that operates at 100Mbps over distances of up to 200 kilometers with
up to 1000 connected stations.
FDDI dual ringThe pair of counter-rotating, logical rings (primary and secondary) common
to the FDDI network. This architecture provides a high degree of reliability.
In normal operation, only the primary ring carries data. The second or
backup ring is used for automatic recovery in case of failure. If a network
fault occurs, only the stations on either side of the fault are affected. They
detect the fault and automatically bypass it to maintain continuous
transmission of data.
FDDI pathsThe segments of an FDDI ring that pass through a station. Every FDDI
station must contain a primary path. The primary path represents, to the
best of the stationOs knowledge, the segments of the primary ring that pass
through the station. In addition, a station may optionally contain a
secondary path representing the segments of the secondary ring that pass
through the station. A station may contain additional paths representing
segments of rings other than the primary and secondary. Such paths are
called local paths.
FDDI standardA standard by the X3T9.5 Committee of the American National Standards
Institute (ANSI) that addresses the need for more speed and reliability than
is currently available in other standard LANs. Its recent completion is a
major factor contributing to the expected acceptance and widespread use
of optical Ţber as a LAN transmission medium. The standard has four parts.
See also PHY standard, PMD standard, and SMT.
Flash EPROMErasable Programmable Read-Only Memory. |
ACEC
