Difference between Intercommunication System and Annunciator

INTERCOMMUNICATION SYSTEM vs ANNUNCIATOR: NOUN

A buzzer in a UK signal box, that sounds when a train activates a treadle positioned on the track. Provides a warning or announcement of a nearby train.
A signalling device that shows which of several electrical circuits is active, especially such a device in a telephone switchboard
Anything that announces something
An indicator (as in a hotel) which designates the room where attendance is wanted.
One who announces. Specifically: An officer in the church of Constantinople, whose business it was to inform the people of the festivals to be celebrated.
One who or that which announces; an announcer.
One that announces, especially an electrical signaling device used in hotels or offices to indicate the sources of calls on a switchboard.
An indicator that announces which electrical circuit has been active (as on a telephone switchboard)

Telephone receiver, Call box, Public address system, Pa system, Telephone operator, Radioteletype, Rebroadcaster, Telephone box, Telephone line, Audio system, Telephone exchange, Radio receiver, Telephone system, Communication system, Intercom

Variable resistor, Detents, Crystal oscillator, Nvis, Lubricator, Phototransistor, Microswitch, Pyrometer, Toggle switch, Totalizer, Voltmeter, Digital voltmeter, Ammeter, Photocell, Pushbutton

Telephone receiver, Call box, Public address system, Pa system, Telephone operator, Radioteletype, Rebroadcaster, Telephone box, Telephone line, Audio system, Telephone exchange, Radio receiver, Telephone system, Communication system, Intercom

Handwheel, Variable resistor, Detents, Crystal oscillator, Nvis, Lubricator, Phototransistor, Microswitch, Pyrometer, Toggle switch, Totalizer, Digital voltmeter, Ammeter, Photocell, Pushbutton

Such multiple dwelling, as aforesaid, shall also be equipped with an intercommunication system to be located at the required main entrance door.
The infant affective display then becomes part of a conscious intercommunication system with the caretaker.
The audio and a video door intercommunication system are also classified as control of access.

This annunciator control process registers with the device manager when it initializes.
Description: Remote annunciator panels shall annunciate conditions for indicated transfer switches.
Remote annunciator receives the correct point or zone identification information.
The graphic annunciator shall be UL, ULC and CSFM Listed.
Ensure that the DRIVE MALF annunciator light is not lit.
The annunciator bar is green when terrain alerts are inhibited.
Zone numbers will not be allowed on the annunciator.
Red annunciator in center of rocker switch should extinguish.
HT warning light on the annunciator panel illuminates.
Graphic Annunciator, ENVOYThe annunciator shall depict the graphical diagrams or matrix lamps as required per the contract drawings and AHJ.