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SDSL
STU
STU-C
STU-R
STU-S
TXD
T1
V.35
7900-A2-GB20-00
Symmetrical Digital Subscriber Line. A technique for the use of an existing twisted pair line
that permits high bandwidth, bidirectional transmission.
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).
SDSL Termination Unit – SNMP. The SNMP-compatible version of the Maintenance
Processor.
Transmit Data. Pin 2 of the EIA-232 interface that is used by the DTE to transmit data to
the modem. Conversely, the modem uses Pin 2 to receive data from the DTE.
A term for a digital carrier facility used to transmit a DS1 formatted digital signal at
1.544 Mbps. It is used primarily in North America.
An ITU-T standard for a high-speed, 34-position, DCE/DTE interface.
March 1998
Glossary
GL-3
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