Openreach Fibre Modem

[#1]

Hi, my Plusnet Hub One arrived today, I have a query regarding connecting to my phone line.
I currently have a Wi-Fi router connected to a BT Openreach fibre modem which is then connected to a BT Openreach double phone socket.
There is no mention of a fibre modem in the set up instructions, do I connect the new Plusnet One Hub directly to the Double socket or do I connect it to the fibre modem like my current set up?
Thanks Mark

[#2]

@Alfagt 

The Hub One has the modem built in so all you need to do is to connect the Hub One DSL socket to the DSL output on your Openreach Master socket. No separate modem is required.

[#3]

Thank you