Table of Contents
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Glossary
FAW
FCC
FEBE
G.703
HDB3
HDSL
HTU-M
HTU-S
LED
loopback
MTSO
OOF
reset
RTS
RXD
SDSL
SNMP
STU
STU-C
STU-R
STU-S
TXD
V.11
V.35
GL-2
Frame Alignment Word. A loss of synchronization error detection.
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.
ITU-TS standard for covering transmission facilities.
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.
Host Termination Unit – Maintenance. A carrier-mounted module used to perform
maintenance operations on one or more STU-R and STU-C modules.
Host Termination Unit – SNMP. The SNMP-compatible version of the Maintenance
Processor.
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.
Mobile Telephone Switching Office.
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).
Symmetric Digital Subscriber Line. Provides symmetrical bi-directional transmission over
copper wire for both T1 and E1 services.
Simple Network Management Protocol. Allows multi-vendor networking devices to be
managed more easily with common management tools.
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 SDSL connection. Also known as a Line Termination Unit (LTU).
SDSL Termination Unit – Remote. The module at the CP (customer premises) end of an
SDSL connection. Also known as a Network Termination Unit (NTU).
SDSL Termination Unit – SNMP. The SNMP-compatible version of the Maintenance
Processor.
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. Similar to V.35, but used for
longer cable distances where V.35 is not appropriate.
ITU-T standard for a high-speed, 34-pin, DCE/DTE interface.
September 1997
7915-A2-GB20-20
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