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Glossary
X
Generic term used to refer to digital subscriber line equipment and services, including ADSL, IDSL,
xDSL
SDSL, and SHDSL. All are digital technologies that provide high bandwidth over existing copper
infrastructure provided by the telephone companies.
See xTU-C.
xDSL Transmission
Unit—central office
See xTU-R.
xDSL Transmission
Unit—remote
xDSL Transmission Unit—central office. A hardware device that supports xDSL communication and
xTU-C
that is placed in the CO. The xTU-C has a matching unit on the subscriber premise in the form of an
xTU-R. The two units, in combination, support a high data rate over UTP copper cable local loops.
Examples of xTU-Cs are ATU-C, ITU-C, STU-C, and SHTU-C.
xDSL Transmission Unit—remote. A hardware device that supports xDSL communication and that is
xTU-R
placed in the customer's premise. The xTU-R has a matching unit in the carrier's CO in the form of
an xTU-C. The two units, in combination, support a high data rate over UTP copper cable local loops.
Examples of xTU-Rs are ATU-R, ITU-R, STU-R, and SHTU-R.
Cisco 6260 Hardware Installation Guide
GL-30
OL-2365-02
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