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DID
473
Administration for Network Connectivity
555-233-504 — Issue 1 — April 2000 CID: 77730
Glossary
DID
Direct Inward Dialing.
digital communications protocol (DCP)
A proprietary protocol used to transmit both digitized voice and digitized data
over the same communications link. A DCP link is made up of two 64-kbps
information (I-) channels and one 8-kbps signaling (S-) channel. The DCP
protocol supports 2 information-bearing channels, and thus two telephones/data
modules.
digital signal level 0 (DS0)
A single 64-kbps voice channel. A DS0 is a single 64-kbps channel in a T1 or
E1 facility and consists of eight bits in a T1 or E1 frame every 125
microseconds.
digital signal level 1 (DS1)
A single 1.544-Mbps (United States) or 2.048-Mbps (outside the United States)
digital signal carried on a T1 transmission facility. A DS1 converter complex
consists of a pair, one at each end, of DS1 converter circuit packs and the
associated T1/E1 facilities.
digital terminal data module (DTDM)
An integrated or adjunct data module that shares with a digital telephone the
same physical port for connection to a communications system. The function of
a DTDM is similar to that of a PDM and MPDM in that it converts RS-232C
signals to DCP signals.
distributed application
A computer application that runs on one or more clients and uses shared
resources, such as databases. These resources reside on a common server.
Distributed design lets multiple users run programs using common, centrally
maintained files.
domain
An addressable location on a network, such as a group of computers, single
computer, or subdirectory. See Domain Name Server (DNS).
Domain Name Server (DNS)
An Internet computer that maintains a database of domain names.
Provides a mapping of alphanumeric names to IP addresses; for example,
xxx.xxx.xxx.xxx --> www.lucent.com.
DNS
See Domain Name Server (DNS).