Cisco 6400 Guia de preparacion descargar pdf (Pagina 178)

Glossary

GL-4

Cisco 6400 Software Setup Guide

OL-1183-04

DCC Data Country Code. One of two ATM address formats developed by the ATM Forum for use by private

networks. Adapted from the subnetwork model of addressing in which the ATM layer is responsible

for mapping network layer addresses to ATM addresses. Compare with ICD.

DHCP

Dynamic Host Configuration Protocol. Provides a mechanism for allocating IP addresses dynamically

so that addresses can be reused when hosts no longer need them.

DMA direct memory access. DMA transfers data into memory at high speeds with no processor overhead.

DNIS dialed number identification service. Method for delivery of automatic number identification that uses

out-of-band signaling

DNS

Domain Name Server. The part of the distributed database system for resolving a fully qualified domain

name into the four-part IP (Internet Protocol) number used to route communications across the Internet.

downlink A network connection between the Cisco 6400 chassis and an aggregated modem shelf.

DRAM dynamic random-access (read/write) memory.

DS0

digital signal level 0. Framing specification used in transmitting digital signals at 64 kbps. Twenty-four

DS0s equal one DS1.

DS1 digital signal level 1. Framing specification used in transmitting digital signals at 1.544 Mbps on a T1

facility.

DS3 digital signal level 3. Framing specification used for transmitting digital signals at 44.736 Mbps on a

T3 facility.

DSL

digital subscriber line. A public network technology that delivers high bandwidth over conventional

copper wiring at limited distances. There are various types of DSL, including ADSL, HDSL, SDSL,

and VDSL. All are provisioned via modem pairs, with one modem located at a central office and the

other at the customer site. Because most DSL technologies don't use the whole bandwidth of the twisted

pair, there is room left for a voice channel.

DSLAM DSL access multiplexer.

DTE data terminal equipment. Device at the user end of a user-network interface that serves as a data source,

destination, or both. DTE includes such devices as computers, protocol translators, and multiplexers.

EHSA

enhanced high system availability. This processor redundancy scheme reduces switchover time by

requiring that the redundant processor be running in hot standby mode.

EIA Electronic Industries Association. Group that specifies electrical transmission standards. The EIA and

TIA have developed numerous well-known communications standards, including EIA/TIA-232 and

EIA/TIA-449. See also TIA.

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Cisco 6400 Guia de preparacion Pagina 178