| |
|
F |
| FAT |
 |
File Allocation Table |
| Fault
tolerance |
|
Generally,
the ability to prevent a problem on a device from affecting
other devices on the same
port. |
| FCAPS |
|
Faults,
Configuration, Accounting, Performance and Security |
| FCS |
|
Frame Check Sequence; First Customer Shipment, extra
characters added to a frame for error control purposes;
HDLC term adopted by subsequent link layer
protocols. |
| FCU |
|
Fraction Channel Unit |
| FDDI |
|
Fiber-Optic Distributed Data Interface; Fiber Distributed
Data Interface. A cable interface capable of transmitting
data at 100Mbps. Originally specified for fiber lines.
FDDI can also operate over twisted-pair cable for short
distances. LAN technology that permits 100-mega-bit-per-second
(Mbps) data transfer. ANSI has proposed FDDI as standard
X3T9.5. |
| FDM |
|
Frequency Division Multiplexing |
| FECN |
|
Forward Explicit Congestion Notification |
| FEP |
|
Front End Processor, device or board that provides
a network interface for networked devices. In SNA,
typically an IBM 3745 device. |
| FG |
|
Frame Ground |
| Fiber-optic
cable |
|
A
transmission medium that uses glass or plastic fibers,
rather than copper wire, to transport data
or voice signals. The signal is imposed on the fibers
via pulses (modulation) of light from a laser or a
light-emitting diode (LED). Because of its high bandwidth
and lack of susceptibility to interference, fiber-optic
cable is used in long-haul or noisy applications. |
| FIFO |
|
First
In First Out |
| File
Server |
|
A
computer that stores data for network users and provides
network access to that data. |
| Filtering |
|
Process
whereby an Ethernet switch or bridge reads the contents
of a packet and then finds that the packet
does not need to be forwarded, drops it. A filtering
rate is the rate at which a device can receive packets
and drop them without any loss of incoming packets
or delay in processing.
Firmware Alterable programs in semipermanent storage, e.g. some type of read-only
or flash reprogrammable memory. |
| Flash
EPROM |
|
PROM
(Programmable Read-Only Memory) technology providing
nonvolatile storage that can be electrically
erased in the circuit and reprogrammed; developed by
Intel and licensed to other semi-conductor companies. |
| Flooding |
|
Technique
where routing information received by a routing device
is sent out through every interface on that
device except the one on which the information was
received. |
| Flow
control |
|
Method
for ensuring that a transmitting entity does not overwhelm
a receiving entity with data. |
| FM |
|
Frequency Modulation |
| |
|
|
| FOIRL |
|
Fiber
Optic Inter-Repeater Link, Fiber-optic signaling methodology
based on the IEEE 802.3 fiber-optic specification. |
| FOM |
|
Fiber Optical Modem |
| FOMX |
|
Fiber Optical Multiplex |
| Forwarding |
|
Process whereby an Ethernet switch or bridge reads
the contents of a packet and then passes that packet
on to the appropriate attached segment. A forwarding
rate is the time that it takes the device to execute
all of the steps. |
| FR |
|
Frame
Relay |
| Fractional
T-1 |
|
A
WAN communications service that provides the user with
some portion of a T1 circuit which has been
divided into 24 separate 64 Kb channels; Fraction E-1
in Europe. |
| FRAD |
|
Frame Relay Access Device |
| Fragment |
|
A
piece of a larger packet that has been broken down
into smaller units. |
| Fragmentation |
|
Breaking a packet into smaller units when transmitting
over a network medium that cannot support the original
size of the packet. |
| Frame |
|
Set
of bits that form an elementary block of data to be
sent over a communications channel. Usually, a frame
contains its own control information, including
the transmission address and data for error detection. |
| Frame
relay |
|
High-performance
interface for packet-switching networks; considered
more efficient
than X.25, which
it is expected to replace. Frame relay technology can
handle "bursty" communications that have rapidly
changing bandwidth requirements.
|
| FRND |
|
Frame
Relay Network Device |
| FSK |
|
Frequency
Shift Keying |
| FSP |
|
File Service Protocol |
| FST |
|
Fast
Sequenced Transport |
| FTAM |
|
File Transfer, Access and Management, the OSI remote
file service and protocol. See FTP. |
| FTP |
|
File Transfer Protocol, a TCP/IP protocol for file
transfer. |
| FXO |
|
Foreign
Exchange Office. |
| FXS |
|
Foreign Exchange Station |
| |
|
|
