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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Glossary and Abbreviations
Page GL-17
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 Communications
Protocol. The DCP protocol supports 2 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 2
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 (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.