Glossary:
Installation and Upgrades for G700 with S8300 or S8700
555-234-100 — Issue 3 — May 2003
329
digital data endpoints
Devices such as the 510D terminal or the 515-type business communications terminal (BCT).
digital multiplexed interface (DMI)
An interface that uses DS1 24th-channel signaling to provide connectivity between a communications system and a host
computer or between two communications systems. 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-0 (DS0)
See digital signal level n (DS-n)
.
digital signal-1 (DS1)
See digital signal level n (DS-n)
.
digital signal level n (DS-n)
A term for the series of standard digital transmission rates or levels that are used to classify the capacities of digital lines
and digital trunks. Signals are based on DS0, and range upward to DS4. DS0 is a transmission rate of 64 Kbps, which is
the bandwidth that is normally used for one telephone channel. A DS0 is a single 64-kbps channel in a T1 facility or an
E1 facility, and consists of 8 bits in a T1 frame or an E1 frame every 125 microseconds. DS1, used as the signal in the T-
1 carrier, is 24 DS0 (64 Kbps) signals that are transmitted using pulse-code modulation (PCM) and time-division
multiplexing (TDM). DS-2 is four DS1 signals that are multiplexed together to produce a rate of 6.312 Mbps. DS-3, the
signal in the T-3 carrier, carries a multiple of 28 DS1 signals or 672 DS0s or 44.736 Mbps. Digital signal n is based on the
ANSI T1.107 guidelines.
digital signal processor (DSP)
A specialized microprocessor that processes a stream of bits in real time. In the telecommunications industry, DSPs are
used for such things as echo cancellation, call progress monitoring, voice processing, and the compression of voice and
video signals. See also codec
; compression.
digital terminal data module (DTDM)
An integrated data module or an adjunct data module that shares the same physical port with a digital telephone for
connection to a communications system. The function of a DTDM is similar to that of a processor data module (PDM)
and a modular processor data module (MPDM), in that a DTDM converts RS-232C signals to Digital Communications
Protocol (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 is converted to digital form, and then transmitted as a serial stream of
pulses.
digital trunk
A circuit that carries digital voice, digital data, or both in a telecommunications channel.
DIMM
See
dual in-line memory module (DIMM).
DIOD
Direct Inward and Outward Dialing (DIOD)
Direct Agent
A feature that is available only through the Adjunct-Switch Application Interface (ASAI). With Direct Agent, a call can
be placed in a split queue, but will be routed only to a specific agent in that split. The call is measured as an ACD call and
receives normal ACD call treatment such as announcements, but only a particular agent answers.
