Specifications

E&M Card
An E&M voice card for this system.
ETS1
European Telecommunications Standards Institute
F4
Four-frame multiframe structure used in T1 signals.
FAS
Frame Alignment Signal
FCC
Federal Communications Commission
FDL
Facility Data Link, consists of every other framing bit of an extended T1 superframe. The FDL
is used to convey performance data, line test/loopback status, and other parameters for an
ESF-framed T1 line. The FDL rate is 4 kHz.
FE1
Fractional E1
FEBE
Far End Block Error, shows transmission errors detected by the far end equipment
FOTS
Fiber Optics Transmission Systems
frame
A delineated assembly of information, consisting of one sequence of 24 encoded channel
samples (T1) or 32 channel samples (E1).
FRAD
Frame Relay Assembler/Disassembler, a card used in this system.