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GLOSSARY
GL-7
D4 framing
format
D-channel
DACS
data module
data set
data service
unit (DSU)
data terminal
equipment
(DTE)
dB
DCP
decibel (dB)
dialed-number
identification
service (DNIS)
dial pulse
dial-pulse
addressing
DID
digital-access
and cross-
connect system
(DACS)
A format containing 12 frames. See also extended frame and frame.
The 16K-bps or 64K-bps packet-switched channel on an Integrated Services
Digital Network basic rate interface (ISDN-BRI) or 64K-bps on an Integrated
Services Digital Network primary rate interface (ISDN-PRI) packet-switched
channel that carries signaling messages and packet-switched user data. A D-
channel is the (ISDN-PRI) Q.931 signaling channel. (A D-channel can also
carry data, but this capability is not used on a DEFINITY Communications
System Generic 2.) See also B-channel, Q.930 and Q.931.
See digital-access and cross-connect system.
An interconnection device between a basic rate interface (BRI) or Digital
Communications Protocol (DCP) interface of System 75 and System 85 and data
terminal equipment (DTE) or data circuit-terminating equipment (DCE).
See modem.
A device designed to transmit digital data on transmission facilities. See also
network channel-terminating equipment.
The equipment that makes up the endpoints in a connection over a data circuit.
For example, in a connection between a data terminal and a host, the terminal,
the host, and their associated modems or data modules make up the DTE. DTE
usually consists of the following functional units: control logic, buffer store, and
one or more input or output devices or computers. DTE can also contain error
control, synchronization, and telephone-identification capabilities.
See decibel.
See Digital Communications Protocol.
A relative unit of measure that converts the power or voltage ratio for acoustic or
electrical energy at each of two points to a useful and comparative form. For
example, a 3-dB loss implies a loss ratio of one half and a 6-dB loss implies a
ratio of one fourth.
A display provided to the answering agent of a service or project, or of the
number called by the caller, so that agents grouped in one split can answer calls
appropriately for different services. DNIS can also be sent to a host computer or
other adjunct.
Regular momentary interruptions by the sending end of a direct- or alternating-
current path. The number of interruptions corresponds to the value of a digit or
character. Also called dial-pulse addressing.
See dial pulse.
See Direct Inward Dialing.
A reconfigurable, central-office (CO) system used to cross-connect digital signal
level 1s (DS1s). A DACS takes DS1s as inputs and also outputs DS1s.