What are these BT boxes ?

[edwardskevin]

Hi Team

I am moving into a 8 year old house that  part of  which was previously  used as an office and BT supplied the internet . 

The internet connection boxes (untidily installed in cupboard under stairs) 

I am changing internet provider (probably   to 900gb fibre from Sky) . No phone requirement .

Regarding the  three BT equipment boxes shown in the picture , I understand the  modem (will be removed) and the ONT (fibre terminal with the lights , which has to stay ? can be switched off ?) .

 But what is the rectangular BT business box  function and can it be removed ?

Value your comments 👌

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[imjolly]

The 'boxes' are the property of openreach not BT RETAIL  so I would talk to your SKY installer

[edwardskevin]

ok, but what is the function of the rectangular box above the ONT box ?

[iniltous]

The rectangular box above the ONT , is the PSU (power supply unit ) for the BBU (battery back up unit ) as this is clearly a PSU as its plugged into a mains power outlet, I’m not sure you have identified the ONT correctly .

The box to the right of the mains sockets and Ethernet patch panel, which I think you are incorrectly identifying as the ONT is the CSP (customer service point ) 

[iniltous]

On closer inspection you probably think the BBU is the ONT because the lead from the PSU is labelled as ONT , in this old style FTTP installation, the power lead goes to the BBU which powers the ONT , the power lead can also be connected directly to the ONT leaving the BBU out if the ‘chain’ , which in this case would make no difference as it’s in an alarm state because its batteries are now defective so in a mains power failure it would not power the ONT anyway .