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2. Intercom - Wikipedia

   en.wikipedia.org/wiki/Intercom

   Encrypted wireless intercoms can reduce or eliminate privacy risks, while placement, installation, construction, grounding and shielding methods can reduce or eliminate the detrimental effects of external interference. The United States and Canada have several frequency ranges for wireless intercom systems and other wireless products.

3. Wireless intercom - Wikipedia

   en.wikipedia.org/wiki/Wireless_intercom

   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 frequencies allotted by various government agencies. Some wireless intercom systems communicate using the 802.11 standard. [1]

4. Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Business_telephone_system

   The original intercom KTUs, WECo Model 207, were wired for a single talk link, that is, a single conversation on the intercom at a time. The WECo 6A dial intercom system provided two talk links and was often installed as the dial intercom in a 1A1 or 1A2 key system. The 6A systems were complex, troublesome, and expensive, and never became popular.

5. Intercoms: A History of Distance - AOL

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

   Clear-Com's Simon Browne takes us on a tour of the evolution of the intercom system. From analog to digital to the cloud, how have production crew communications evolved? Clear-Com's Simon Browne ...

6. List of telephone switches - Wikipedia

   en.wikipedia.org/wiki/List_of_telephone_switches

   HS 25 (modified from the Ericsson OL-100 system with double relays and 25-point selector (Ericsson license), mainly used for small villages and towns in the counties) HS 31 (new developed register system, introduced in 1931, based on a new flat type relay and a 100-point two-motion selector, suitable for small and large exchanges)

7. Talk:Business telephone system - Wikipedia

   en.wikipedia.org/wiki/Talk:Business_telephone_system

   EPABX (Electronic Private Automatic Branch Exchange) EPABX is an electronic device used in Offices, Hotels, Industries and many other places for voice communication. It is independent and can work with out any trunk lines (service providers) The main features offered by any EPABX system are: 1. Call transfer 2. Call pick up 3. Call back up 4.