Paradyne HotWire 7925 User Manual page 56

Glossary
HTU
Host Termination Unit. A generic reference to either an HTU-C or HTU-R module.
HTU-C Host Termination Unit – Central. The module at the CO (central office) or central site end
of an HDSL connection. Also known as a Network Termination Unit (NTU).
HTU-M
Host Termination Unit – Maintenance. A carrier-mounted module used to perform
maintenance operations on one or more HTU-R and HTU-C modules.
HTU-R Host Termination Unit – Remote. The module at the CP (customer premises) end of an
HDSL connection. Also known as a Line Termination Unit (LTU).
LED
Light Emitting Diode. A status indicator that responds to the presence of a certain
conditions.
loopback
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.
OOF Out Of Frame. An error condition in which frame synchronization bits are in error. A
network-reported condition.
reset
A reinitialization of the device that occurs at power-up or in response to a reset command.
RTS Request to Send. An EIA-lead standard for V.24 circuit CT 105; an input signal
(DTE-to-DCE).
RXD
Received Data. An EIA-lead standard for V.24 circuit CT 104; an output signal
(DCE-to-DTE).
TXD Transmit Data. An EIA-lead standard for V.24 circuit CT 103; an input signal
(DTE-to-DCE).
T1
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.
V.35
ITU-T standard for a high-speed, 34-pin, DCE/DTE interface.
GL-2
June 1997 7925-A2-GB20-30
PRELIMINARY DRAFT