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DEFINITY Enterprise Communications Server Release 8.2
Upgrades and Additions for R8r
555-233-115
Issue 1
April 2000
Glossary and Abbreviations
GL-17
dial-repeating tie trunk
A tie trunk that transmits called-party addressing information between two communications
systems.
DID
Direct Inward Dialing
digit conversion
A process used to convert specific dialed numbers into other dialed numbers.
digital
The representation of information by discrete steps. See also
analog.
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.
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 (ADC).
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