Instruction manual

DEFINITY® Business Communications System and GuestWorks® Issue 6
Overview
555-231-208
Issue 1
April 2000
Glossary and Abbreviations
GL-12
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.
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 the system, devices such as the 510D terminal or the 515-type business communications
terminal (BCT).
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
Direct Extension Selection (DXS)
A feature on an attendant console that allows an attendant direct access to telephones by pressing
a group-select button and a DXS button.
Direct Inward Dialing (DID)
A feature that allows an incoming call from the public network (not FX or WATS) to reach a specific
telephone without attendant assistance.
Direct Inward Dialing (DID) trunk
An incoming trunk used for dialing directly from the public network into a communications system
without help from the attendant.
DIVA
Data In/Voice Answer
DLC
Data line circuit