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2. BT Versatility - Wikipedia

   en.wikipedia.org/wiki/BT_Versatility

   Built in ADSL Modem; Redundant Internet via ISDN; The following may be installed inside the CCU. Music On-Hold (MOH) Module which connects to any Extension on the CCU. Battery Backup - requires a 7aH Sealed Lead Acid Battery to give 40mins at 11erlangs.

3. Uninterruptible power supply - Wikipedia

   en.wikipedia.org/wiki/Uninterruptible_power_supply

   The offline/standby UPS offers only the most basic features, providing surge protection and battery backup. The protected equipment is normally connected directly to incoming utility power. When the incoming voltage falls below or rises above a predetermined level the UPS turns on its internal DC-AC inverter circuitry, which is powered from an ...

4. 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 ...

5. These Modem-Router Combo Boxes Can Help Lower Your Internet ...

   www.aol.com/lifestyle/modem-router-combo-boxes...

   This affordable modem-router combo is a decent bare-bones machine that’s perfect for sub-gigabit internet plans. It still offers the DOCSIS 3.1 standard and compatibility with major cable ISPs ...

6. 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 ...

7. Battery room - Wikipedia

   en.wikipedia.org/wiki/Battery_room

   Telephone system central offices contain large battery systems to provide power for customer telephones, telephone switches, and related apparatus. [2] Terrestrial microwave links, cellular telephone sites, fibre optic apparatus and satellite communications facilities also have standby battery systems, which may be large enough to occupy a separate room in the building.