TeleCom Glossary

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Glossary: F
Facilities Assignment Control System (FACS) Database system for assigning and controlling cable pairs.
FAD See Facility Access Digroup.
Facility access digroup (FAD) This term refers to the DS1 path(s) between the DTAU and the test system.
Far-end Alarm and Control (DS3 FEAC) A DS3 C-bit subframe used to send alarm or status information from the far-end terminal to the near-end terminal. The channel is also used to initiate DS3 loopbacks at the far-end terminal from the near-end terminal (or mid-point test resource).
Far-end block error (FEBE) An indication sent to a transmitting node that a flawed block has been detected at the receiving node.
FAS Frame Alignment Signal
FBE See Framing Bit Error.
FC Framing Conversion
FCIF Flexible Computer Interface Format
FCS See Frame Check Sequence.
FDDI Fiber Distributed Data Interface
FDL Facility Data Link
FDM See Frequency Division Multiplexing.
FDS1 Fractional DS1 (or FT1)
FE1 Fractional E1
FEC Forward Error Correction
FECN Forward Explicit Congestion Notification
FEP See Front-End Processor.
FEV Far-End Voice
FEXT Far-End Cross-Talk
FIFO "First In
Flag The unique bit pattern (01111110) in a data stream at the data link layer used to mark the start or end of a frame. Requires bit stuffing so strings of ones in the data do not erroneously indicate a start or end to a frame.
FLC Function Level Code
Foreign exchange A circuit between a customer's main station or private branch exchange and a central office. This circuit is different than the one that normally serves the exchange area in which the customer is located.
Format errors "Any deviations from the prescribed format of the signal. This includes bipolar violations
Four-wire circuit (4W) A circuit which uses two electrically separated paths to carry data signals. One path is used for each direction.
FPS Framing Pattern Sequence
FPU FADplus Line Interface Unit
Fractional T1 "A technology that combines several individual channels on a T1 and uses them as a single channel. This action provides channels of a greater bandwidth (multiples of 64 or 56 kbps) than the typical 64-kbps channel
FRAD Frame Relay Access Device
Frame check sequence (FCS) A checking code used to detect data corruption.
Frame error (DS1): A frame synchronization bit error which occurs in either a terminal framing (Ft) bit or signaling framing (Fs) bit of the superframed format.
Frame relay "A high-speed
Frame slip The deletion or duplication of a frame of data. You detect a frame slip by the following event sequence:
Frame sync loss "In SF
Framing bit A bit introduced into a bit stream that identifies where one frame ends and the next one begins. This bit helps separate the characters at the receiving end of a transmission.
Framing bit error (FBE) "In SF
Framing bit error ratio "The number of framing bits in error divided by the total number of framing bits. This computation does not include any second where there is LOS
Frequency division multiplexing (FDM) The process of combining a number of analog signals onto a single transmission facility by an orderly assignment of frequency bands.
FRMBE Framing Bit Errors
Front-end processor (FEP) "A communications processor
Ft Terminal Framing
FT1 Fractional T1 (aka Nx64k)
FT3 Fractional T3
Full-duplex A transmission mode in which information can travel in both directions at the same time.
FX See Foreign Exchange.
 

 

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