encyclopedia

DIAGNOSTIC TEST EQUIPMENT

Pre-programmed automatic-test sets used to check car circuitry and subsystems. Usually for use in shops, but may refer to portable sets on cars or trains.

DIAL-A-RIDE TRANSPORTATION SYSTEM (DAR)

A demand-responsive system in which curb-to-curb transportation is provided to patrons who request service by telephone, either on an ad-hoc or subscription basis. It is also known as dial-a-bus (DAB) when buses are the vehicles used. (TRB)

DIALBACK

Used as a control over dialup telecommunications lines. The telecommunications link established through dialup on the computer from a remote location is interrupted so the computer can dial back to the caller. The link is permitted only if the caller…