Glossary
D
Dedicated Subscriber Lines
Communication lines (usually twisted pair) that are used to connect on- premise telephone equipment (such as a PBX) to the Central Office. Also referred to as direct lines.
Dial Line
A telephone line which is part of the Public Switched Telephone Network and is accessed through the DEFINITY Extender 1100 System’s automatic
F
Facility
Transmission facilities. Usually a two metallic pair set of cords, but can be telephone company carriers,