Cisco Cisco 6015 IP DSL Switch
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Cisco IOS Release 12.2(12)DA
Glossary
Glossary
ADSL—asymmetric digital subscriber line. A DSL technology in which the transmission of data from
server to client is much faster than the transmission from the client to the server.
server to client is much faster than the transmission from the client to the server.
ADSL Transmission Unit—Central Office—See ATU-C.
ADSL Transmission Unit—Remote—See ATU-R.
asymmetric digital subscriber line—See ADSL.
Asynchronous Transfer Mode—See ATM.
ATM—Asynchronous Transfer Mode. A cell-based data transfer technique in which channel demand
determines packet allocation. ATM offers fast packet technology, and real-time, demand-led switching
for efficient use of network resources.
determines packet allocation. ATM offers fast packet technology, and real-time, demand-led switching
for efficient use of network resources.
ATU-C—ADSL Transmission Unit—Central Office. Special electronics in support of ADSL and placed
in the carrier’s CO. The ATU-C has a matching unit on the subscriber premise in the form of an ATU-R.
The two units, in combination, support a high data rate over UTP copper cable local loops.
in the carrier’s CO. The ATU-C has a matching unit on the subscriber premise in the form of an ATU-R.
The two units, in combination, support a high data rate over UTP copper cable local loops.
ATU-R—ADSL Transmission Unit—Remote. Special electronics in support of ADSL and placed in the
customer’s premises. The ATU-R has a matching unit in the carrier’s CO in the form of an ATU-C. The
two units, in combination, support a high data rate over UTP copper cable local loops.
customer’s premises. The ATU-R has a matching unit in the carrier’s CO in the form of an ATU-C. The
two units, in combination, support a high data rate over UTP copper cable local loops.
bridge—A device that connects two or more physical networks and forwards packets between them.
Bridges can usually be made to filter packets, that is, to forward only certain traffic. Related devices are:
repeaters which simply forward electrical signals from one cable to the other, and full-fledged routers
which make routing decisions based on several criteria. See router.
Bridges can usually be made to filter packets, that is, to forward only certain traffic. Related devices are:
repeaters which simply forward electrical signals from one cable to the other, and full-fledged routers
which make routing decisions based on several criteria. See router.
CBOS—Cisco Broadband Operating System. An operating system that users access to configure and
operate Cisco products.
operate Cisco products.
chassis—The card cage (housing) where modules are placed.
CLI—command line interface.
CPE—customer premises equipment.
CTC—common transmit clock.
DDTS—Cisco Distributed Defect Tracking System. Cisco uses DDTS to track bugs in a variety of
products, including router software, communication server software, and network management software.
DDTS is also used to track bugs in some hardware and microcode products, and for bugs in some internal
tools, including the automated test software and various software tools.
products, including router software, communication server software, and network management software.
DDTS is also used to track bugs in some hardware and microcode products, and for bugs in some internal
tools, including the automated test software and various software tools.
digital signal level 3—See DS3.
Distributed Defect Tracking System—See DDTS.
DMT—Discrete Multi-Tone. An ADSL modulation scheme defined by the ANSI T1.413 standard. DMT is
a multicarrier modulation scheme where incoming data is collected and then distributed over a large number
of small individual channels, each of which uses a form of Quadrature Amplitude Modulation (QAM).
DMT creates the channels using a digital technique known as Discrete Fast-Fourier Transform.
a multicarrier modulation scheme where incoming data is collected and then distributed over a large number
of small individual channels, each of which uses a form of Quadrature Amplitude Modulation (QAM).
DMT creates the channels using a digital technique known as Discrete Fast-Fourier Transform.
downstream rate—The line rate for return messages or data transfers from the network machine to the CPE.
DS-3—Digital signal level 3. A framing specification used for transmitting digital signals at 44.736 Mbps
on a T3 facility.
on a T3 facility.
DSL—digital subscriber line.
DSLAM—digital subscriber line access multiplexer. A device that concentrates digital subscriber line
signals at the telephone service provider location and multiplexes them onto the broadband wide area
network. Replaces ADSLAM.
signals at the telephone service provider location and multiplexes them onto the broadband wide area
network. Replaces ADSLAM.