Cisco 1-PORT G.SHDSL 2600 - Manual (Page 21)

1-Port G.SHDSL WAN Interface Card for Cisco 2600 Series Routers
Glossary
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Cisco IOS Release 12.2(4)XL
Glossary
ABR—available bit rate.
ADSL—asymmetric digital subscriber line (ADSL) available through several telecommunications
carriers to accommodate the need for increased bandwidth for Internet access and telecommuting
applications.
ATM—Asynchronous Transfer Mode. International standard for cell relay in which multiple service
types (such as voice, video, or data) are conveyed in fixed-length (53-byte) cells. Fixed-length cells
allow cell processing to occur in hardware, thereby reducing transit delays. ATM is designed to take
advantage of high-speed transmission media such as E3, SONET, and T3.
CLI—command-line interface.
CO—Central office, or local exchange (local switch), which terminates individual local telephone
subscriber lines for switching, and connects to the public network. Known as a class 5 switch office. For
example, 5ESS by Lucent and DMS 100 by Nortel.
CPE—customer premise equipment, including devices such as channel service units (CSUs)/data
service units (DSUs), modems, and ISDN terminal adapters, required to provide an electromagnetic
termination for wide-area network circuits before connecting to the router or access server. This
equipment was historically provided by the telephone company, but is now typically provided by the
customer in North American markets.
DSL—digital subscriber line available through several telecommunications carriers to accommodate the
need for increased bandwidth for Internet access and telecommuting applications.
FXO—foreign exchange office. A FXO interface connects to a central office.
FXS—foreign exchange station: A FXS interface connects directly to a standard telephone, supplying
ring voltage, dial tone, etc.
G.SHDSL—Multirate Symmetrical High-Speed Digital Subscriber Line
IAD—integrated access device. A CPE device used to combine services from various sources onto a
common platform for transmission on a common transport span. Typically, an IAD combines various
voice and data services such as circuit-based services like traditional POTS and packet-switched services
such as frame relay or ATM.
PVC—permanent virtual circuit.