AT&T MERLIN LEGEND Release 3.1 Maintenance And Troubleshooting Manual page 397

Glossary
Digital Signal 1
digital switch
element
digital transmission
DIP switch
direct facility
termination
Direct Inward Dialing See DID.
Direct-Line Console
Direct Station
Selector
display buttons
DLC
DNIS
door answering unit
DOS
GL–12
Maintenance and Troubleshooting
See DS1 .
See DSE .
Mode of transmission in which the information to be
transmitted is first converted to digital form and then
transmitted as a serial stream of pulses. See also analog
transmission .
(dual in-line package) Switch on a 400EM module used to
select the signaling format for tie-line transmission. Also
used on other equipment for setting hardware options.
(DFT) See personal line .
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)