AT&T Door Phone Controller - Manual (Page 16)

Terms You Should Know
AuxiliaryAlert —A door speaker’s push button can activate a
bell/chime within the building.
Cadence —Telephone Ringing cycle, i.e., 2 second ringing,
4 second no ringing.
C.O. line —Central Office telephone line carrier into building.
EKTS (Electronic Key Telephone System) —Small business
telephone communications system.
Ground Start —One method by which a business telephone
system (PBX) signals the telephone company that you have
gone off-hook. Used in most business applications – contact
your telephone company to determine if you have Ground or
Loop Start.
Loop Start —One method of signaling the telephone company
that your telephone has gone off-hook – used for most
residential and communication system applications. Contact
your telephone company to determine if you have Ground or
Loop Start.
PBX (Private Branch Exchange) —Business telephone
system.
Ringdown —In Station mode, the activation of the door
speaker’s push button will cause the AT&T Door Phone
Controller to dial the number of a predetermined telephone
station number (PBX or EKTS must be installed). When the
telephone is answered, there is direct two-way communication
with the door speaker.
Trunk Port —PBX connection for Central Office or trunk lines.
Station Port —PBX connection for station sets.
Hook-Flash —This causes telephone equipment to go “on
hook” for a duration usually less than a second (not long
enough to be considered as calling for the circuit to be
released.)
Introduction 1-5