ADJUNCT UNIT KEY TELEPHONE

Brand	Owner	Address	Description
KEYPLUS	AMERICAN TELEPHONE AND TELEGRAPH COMPANY	32 Avenue of the Americas New York NY 100132412	adjunct unit for key telephone systems;KEY PLUS;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

An interface circuit that interconnects a terminal device at an extension station with the adjunct port circuit of a telephone of a business communications system (BCS), such as a digital PBX. The interface circuit enables a call diverted to a BCS telephone to be answered at the extension station. The interface circuit receives a ringing control signal from the adjunct port circuit when its BCS telephone is rung on an incoming call. This causes a ringing current source in the interface to apply ringing current to the extension station simultaneously with ringing of the BCS telephone.