Glossary
GL-2
7914-A2-GB20-00
February 1998
Federal Communications Commission. Board of Commissioners that regulates all U.S.
interstate, intrastate, and foreign electrical communication systems that originate from the
United States.
Far End Bit Error. Number of errors reported by the remote equipment.
High Density Bipolar 3 coding format.
High-bit-rate Digital Subscriber Loop. Provides high bandwidth, bi-directional transmission
over copper wire for both T1 and E1 services.
Light Emitting Diode. A status indicator that responds to the presence of a certain
conditions.
Used to test various portions of a data link in order to isolate an equipment or data line
problem. A diagnostic procedure that sends a test message back to its origination point.
Multiframe Out of Sync. An error was detected in the synchronization of a multiframe.
An ordered, functional sequence of frames on a multiplexed digital circuit.
Out Of Frame. An error condition in which frame synchronization bits are in error. A
network-reported condition.
A reinitialization of the device that occurs at power-up or in response to a reset command.
Request to Send. An EIA-lead standard for V.24 circuit CT 105; an input signal
(DTE-to-DCE).
Received Data. An EIA-lead standard for V.24 circuit CT 104; an output signal
(DCE-to-DTE).
Symetrical Digital Subscriber Loop. Provides high bandwidth, bi-directional transmission
over copper wire for both T1 and E1 services using 2 wires.
Signal to Noise. A ratio, expressed in decibels, of the usable signal and interference on a
line.
SDSL Termination Unit. A generic reference to either an STU-C or STU-R module.
SDSL Termination Unit – Central. The module at the CO (central office) or central site end
of an HDSL connection. Also known as a Line Termination Unit (LTU).
SDSL Termination Unit – Remote. The module at the CP (customer premises) end of an
HDSL connection. Also known as a Network Termination Unit (NTU).
A data signaling rate common in the United States. A term for a digital carrier facility used
to transmit a DS1 formatted signal of 1.544 Mbps.
Transmit Data. An EIA-lead standard for V.24 circuit CT 103; an input signal
(DTE-to-DCE).
ITU-T standard for a high-speed, 34-pin, DCE/DTE interface.
FCC
FEBE
HDB3
HDSL
LED
loopback
MOS
multiframe
OOF
reset
RTS
RXD
SDSL
S/N
STU
STU-C
STU-R
T1
TXD
V.35
