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Data that is coming from the NI-2 card to the subscriber lines. See also upstream.
downstream
digital signal level 3. A framing specification used for transmitting digital signals at 44.736 Mbps on
DS3
a T3 facility. See also E3.
digital subscriber line. Public network technology that delivers high bandwidth over conventional
DSL
copper wiring at limited distances. There are several types of DSL: ADSL, IDSL, SDSL, and SHDSL,
to name a few. All are provisioned via modem pairs, with one modem located at a CO and the other
at the customer site. Because most DSL technologies do not use the whole bandwidth of the twisted
pair, there is room remaining for a voice channel. See also ADSL, IDSL, SDSL, and SHDSL.
An organization of competing companies that sponsors an Internet Web site (http://www.adsl.com)
DSL Forum
containing information about the applications, technology, systems, market, trials, and tariffs related
to DSL technology.
digital subscriber line access multiplexer. A device that connects many digital subscriber lines to a
DSLAM
network by multiplexing the DSL traffic onto one or more network trunk lines. The Cisco DSLAMs
include the Cisco 6015, Cisco 6100, Cisco 6130, Cisco 6160, and Cisco 6260. See also chassis and
multiplexer.
data terminal equipment. Device at the user end of a user-network interface that serves as a data
DTE
source, destination, or both. DTE connects to a data network through a DCE device (for example, a
modem) and typically uses clocking signals generated by the DCE. DTE includes such devices as
computers, protocol translators, and multiplexers. Compare with DCE.
See DHCP.
Dynamic Host
Configuration
Protocol
E
Wide-area digital transmission scheme used predominantly in Europe that carries data at a rate of
E1
2.048 Mbps. See also T1.
Wide-area digital transmission scheme used predominantly in Europe that carries data at a rate of
E3
34.368 Mbps. See also DS3 and T3.
explicit forward congestion indication. In ATM, one of the congestion feedback modes allowed by
EFCI
ABR service. EFCI is set by a network element to notify the destination end-system of congestion or
impending congestion in the network.
Electronic Industries Alliance. A standards organization made up of electronics industry
EIA
organizations. EIA is responsible for the RS-232C and RS-422 standards.
See EIA.
Electronic Industries
Alliance
See ESD.
electrostatic
discharge
OL-2365-02
Cisco 6260 Hardware Installation Guide
Glossary
GL-13
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