AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 270

Glossary
DNIS
DOS
DPI
DS0
DS1
DSE
DSS
DTE
DTMF signaling
Dual-tone
multifrequency
signaling
E&M signaling
EIA
EMI
endpoint
ESD
GL-8 Glossary
sent to a common QCC queue and wait until a QCC is
available to receive a call).
(Dialed Number Identification Service) A service provided
by ASN that routes incoming 800 or 900 calls according to
customer-selected parameters, such as area code, state, or
time of call.
Disk operating system
Dots per inch.
(Digital Signal 0) A single 64-kbps voice or data channel.
(Digital Signal 1) A bit-oriented signaling interface that
multiplexes 24 64-kbps channels into a single 1.544-Mbps
stream.
(Digital switch element) A device in each jack on each
module in the communications system control unit that
interfaces with the TDM bus.
(Direct Station Selector) A 60-button adjunct that enhances
the call-handling capabilities of an MLX-20L telephone or
MLX-28D telephone when used as an operator console.
(Date terminal equipment) The equipment that makes up
the endpoints in a connection over a data circuit, for
example, a data terminal, host computer, or printer.
(Dual-tone multifrequency signaling) Touch-tone signaling
from telephones using the voice transmission path. The
code for DTMF signaling provides 12 distinct signals, each
composed of two voice–band frequencies.
SEE DTMF signaling
Trunk supervisory signaling, used between two
communications systems, in which signaling information is
transferred through two-state voltage conditions (on the
E&M leads) for analog applications and through two bits for
digital applications. See also tie trunk.
(Electronic Industries Association) A trade association of the
electronics industry that establishes electrical and
functional standards.
Electromagnetic interference.
The final destination in the path of an electrical or
telecommunications signal.
Electrostatic discharge.