AT&T MERLIN LEGEND Release 3.1 System Planning Manual page 358

Glossary
direct facility
termination
Direct Inward
Dialing
Direct-Line Console
Direct Station
Selector
display buttons
DLC
DNIS
door answering unit
DOS
DS0
DS1
DSS
DTE
DTMF signaling
GL–10
System Planning
(DFT) See personal line .
See DID.
See DLC .
See DSS .
Buttons on an MLX display telephone used to access the
telephone's display.
(Direct-Line Console) Telephone used by a system
operator to answer outside calls (not directed to an
individual or a group) and inside calls, transfer calls, make
outside calls for users with outward calling restrictions, set
up conference calls, and monitor system operation.
(Dialed Number Identification Service) Service provided
by the AT&T Switched Network ( ASN ); it routes incoming
800 or 900 calls according to customer-selected
parameters, such as area code, state, or time of call.
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.