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2. Door phone - Wikipedia

   en.wikipedia.org/wiki/Door_phone

   Door phone. A door phone or door bell phone is a set of electrical and electronic elements used to handle communication between a resident in a house, apartment or villa and a guest outside. The device can also lock or unlock the door it has been configured to work with. Door phones have been used across a variety of commercial and residential ...

3. Wireless intercom - Wikipedia

   en.wikipedia.org/wiki/Wireless_intercom

   A wireless intercom is a telecommunications device that enables voice communication without the need to run copper wires between intercom stations. A wired intercom system may incorporate wireless elements. There are many types of wireless intercom systems on the market. Most wireless intercom systems communicate by radio waves using one of the ...

4. Video door-phone - Wikipedia

   en.wikipedia.org/wiki/Video_door-phone

   Video door-phone. A video door-phone (also known as a video door entry or video intercom) is a stand-alone intercom system used to manage calls made at the entrance to a building ( residential complex, detached family home, workplace, etc.) with access controlled by audiovisual communication between the inside and outside. The main feature of ...

5. Intercom device unveiled as new home security option for ...

   www.aol.com/intercom-device-unveiled-home...

   The new wifi-connected device links to a user’s current internal intercom handset and allows them to talk to and admit people at the door remotely. Intercom device unveiled as new home security ...

6. Backhaul (telecommunications) - Wikipedia

   en.wikipedia.org/wiki/Backhaul_(telecommunications)

   In a hierarchical telecommunications network, the backhaul[ 1] portion of the network comprises the intermediate links between the core network, or backbone network, and the small subnetworks at the edge of the network (like for example private networks, LANs, etc. [citation needed] ). The most common network type in which backhaul is ...

7. Intercoms: A History of Distance - AOL

   www.aol.com/news/intercoms-history-distance...

   The earliest intercom uses date back to the late 1960s and early 1970s, when concerts became too loud to allow for waving pieces of paper or shouting from the stage to the back of the hall.

8. Intercom - Wikipedia

   en.wikipedia.org/wiki/Intercom

   An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network. [ 1] Intercoms are generally mounted permanently ...

9. Optical wireless communications - Wikipedia

   en.wikipedia.org/wiki/Optical_Wireless...

   Short range: wireless body area network (WBAN) and wireless personal area network (WPAN) applications under standard IEEE 802.15.7, underwater communications. [10] [11] Medium range: indoor IR and visible light communications (VLC) for wireless local area networks (WLANs) and inter-vehicular and vehicle-to-infrastructure communications.