After reading an article recently it said that if you're a vulnerable customer you can request a BBU for the ONT, for in case of a power cut.
Does the BBU only power the ONT? Can it also power the router too?
I'm thinking its only powering the ONT. But in case of a power cut, with the phone plugged in to the router, how is this allowing me to make a phone call during a power cut?
Or am I wrong about the purpose of the BBU?
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do you have a good mobile phone signal/service?
It just powers the ONT. You either need a separate one for the hub or a UPS to power both.