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1. (WO2013159292) A DUAL-CHANNEL ANALOG DOOR ENTRY SYSTEM AND A METHOD THEREOF

Pub. No.:    WO/2013/159292    International Application No.:    PCT/CN2012/074668
Publication Date: Fri Nov 01 00:59:59 CET 2013 International Filing Date: Thu Apr 26 01:59:59 CEST 2012
IPC: H04Q 5/24
Applicants: ABB TECHNOLOGY LTD.
ZHOU, Dalin
CHEN, Jinshu
ZHOU, Xiaoping
ZHANG, Yangpeng
Inventors: ZHOU, Dalin
CHEN, Jinshu
ZHOU, Xiaoping
ZHANG, Yangpeng
Title: A DUAL-CHANNEL ANALOG DOOR ENTRY SYSTEM AND A METHOD THEREOF
Abstract:
The present invention discloses a dual-channel analog door entry system and a method thereof. The dual-channel analog door entry system comprises two cables connected between the building gateway and the floor distributors, configured to transmit audio and/or video signals between the outdoor stations and indoor phones; the building gateway, configured to receive a call request from at least one of the outdoor stations, identify and assign an available cable as an intercom channel, send the call request to each of the floor distributors via the intercom channel, and switch the audio and/or video signals from the outdoor station to the available cable; at least one of floor distributors, configured to receive and forward the call request to a desired indoor phone, receive a call response from the desired indoor phone if the desired indoor phone is available, and switch the audio and/or video signals from the available cable to the desired indoor phone. The solutions of the present invention achieves great improvement on line busy probability for large buildings and communities; and the solution is smart and simple to implement with low additional cost for reconstruction.