Glossary

digital transmission

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.

DIP switch

(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.

direct facility

(DFT) See personal line.

termination

 

Direct Inward Dialing

See DID.

Direct-Line Console

See DLC.

Direct Station

See DSS.

Selector

 

display buttons

Buttons on an MLX display telephone used to access the

 

telephone’s display.

DLC

(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.

DNIS

(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.

door answering unit Device connected to a basic telephone jack and used at

 

an unattended extension or front desk.

DOS

(disk operating system)

DS0

(Digital Signal 0) Single 64-kbps voice or data channel.

GL–12Maintenance and Troubleshooting

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AT&T 3.0 manual Dlc, Dnis, Dos, DS0