Avaya Communication Manager Administrator's Manual page 1794

Glossary and Abbreviations
D
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 two information-bearing channels, and
thus two telephones/data modules. The I1 channel is the DCP channel assigned on the first page of the
8411 station form. The I2 channel is the DCP channel assigned on the analog adjunct page of the
8411 station form or on the data module page.
Digital Communications Protocol. The DCP protocol supports two information-bearing channels, and
thus two telephones/data modules. The I1 channel is the DCP channel assigned on the first page of the
8411 station form. The I2 channel is the DCP channel assigned on the analog adjunct page of the
8411 station form or on the data module page.
digital data endpoints
In DEFINITY ECS, devices such as the 510D terminal or the 515-type business communications
terminal (BCT).
digital multiplexed interface (DMI)
An interface that provides connectivity between a communications system and a host computer or
between two communications systems using DS1 24th-channel signaling. DMI provides 23 64-kbps
data channels and 1 common-signaling channel over a twisted-pair connection. DMI is offered
through two capabilities: bit-oriented signaling (DMI-BOS) and message-oriented signaling
(DMI-MOS).
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.
digital-to-analog converter (DAC)
A device that converts data in digital form to the corresponding analog signals. See also
analog-to-digital converter
digital transmission
A mode of transmission in which information to be transmitted is first converted to digital form and
then transmitted as a serial stream of pulses.
digital trunk
A circuit that carries digital voice and/or digital data in a telecommunications channel.
DIOD
Direct Inward and Outward Dialing
direct agent
A feature, accessed only via ASAI, that allows a call to be placed in a split queue but routed only to a
specific agent in that split. The call receives normal ACD call treatment (for example,
announcements) and is measured as an ACD call while ensuring that a particular agent answers.
1794
(ADC).
Administrator's Guide for Avaya Communication Manager
November 2003