AT&T MERLIN LEGEND Release 3.0 System Programming And Maintenance Manual page 103

Glossary
door answering unit
DOS
DS0
DS1
DSS
DTE
DTMF signaling
Device connected to a basic telephone jack
and used at an unattended extension or front
desk.
(disk operating system)
(Digital Signal 0) Single 64-kbps voice or data
channel.
(Digital Signal 1) Bit- oriented signaling
interface that multiplexes twenty-four 64-kbps
channels into a single 1.544-Mbps stream.
(Direct Station Selector) 60-button adjunct that
enhances the call-handling capabilities of an
MLX-20L or MLX-28D telephone used as an
operator console.
(data terminal equipment) Equipment that
makes the endpoints in a connection over a
data connection, for example, a data terminal,
personal computer, host computer, or printer.
(dual-tone multifrequency signaling) Touch-
tone signaling from telephones using the voice
transmission path. DTMF signaling provides 12
distinct signals, each representing a dialed
digit or character, and each composed of two
voiceband frequencies.
System Programming and Maintenance (SPM) GL-13