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  2. Ambitalk - Wikipedia

    en.wikipedia.org/wiki/Ambitalk

    From 2013 onwards Ambitalk expanded, [7] [8] obtaining low cost national spectrum (due to the unpopular low frequency bands) and installing additional transmitter sites around the country. Ambitalk has installed microwave links and battery backup to each transmitter site.

  3. Network interface device - Wikipedia

    en.wikipedia.org/wiki/Network_interface_device

    As the ONT must derive its power from the customer premises electrical supply, many ONTs have the option for a battery backup in order to maintain service in the event of a power outage. [2] These terminals are used in both active optical networks and passive optical networks. An ONT can work in Single Family Unit/SFU mode (modem/bridge) or ...

  4. Plain old telephone service - Wikipedia

    en.wikipedia.org/wiki/Plain_old_telephone_service

    Plain old telephone service (POTS), or publicly offered telephone service, [1] is a retronym for voice-grade telephone service that employs analog signal transmission over copper loops. The term POTS originally stood for post office telephone service , [ citation needed ] as early telephone lines in many regions were operated directly by local ...

  5. Managed facilities-based voice network - Wikipedia

    en.wikipedia.org/wiki/Managed_facilities-based...

    According to NFPA 72 2010, 3.3.141, [1] an MFVN is defined simply as: A physical facilities-based network capable of transmitting real time signals with formats unchanged that is managed, operated, and maintained by the service provider to ensure service quality and reliability from the subscriber location to public switched telephone network (PSTN) interconnection points or other MFVN peer ...

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  7. Cordless telephone - Wikipedia

    en.wikipedia.org/wiki/Cordless_telephone

    In 1977, Douglas G. Talley and L Duane Gregory were granted U.S. patent 4,039,760 for a duplex voice communication link including controls provided between a base station connected directly to a telephone line of a telephone exchange and a mobile unit consisting of a small, compact cordless telephone instrument containing transmitter, receiver ...

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  9. Backup battery - Wikipedia

    en.wikipedia.org/wiki/Backup_battery

    A valve-regulated lead-acid battery is a battery type that is popular in telecommunications network environments as a reliable backup power source. VRLA batteries are used in the outside plant at locations such as Controlled Environmental Vaults (CEVs), Electronic Equipment Enclosures (EEEs), and huts, and in uncontrolled structures such as ...

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