Installation guide

Glossary
GL-30
Cisco 6260 Hardware Installation Guide
OL-2365-02
X
xDSL
Generic term used to refer to digital subscriber line equipment and services, including ADSL, IDSL,
SDSL, and SHDSL. All are digital technologies that provide high bandwidth over existing copper
infrastructure provided by the telephone companies.
xDSL Transmission
Unit—central office
See xTU-C.
xDSL Transmission
Unit—remote
See xTU-R.
xTU-C
xDSL Transmission Unit—central office. A hardware device that supports xDSL communication and
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.
xTU-R
xDSL Transmission Unit—remote. A hardware device that supports xDSL communication and that is
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.