-
Assuming VDSL/FTTC:
Openreach provide a logical connection from the port in the DSLAM in the green cabinet next to the PCP back to the an Ethernet switch in the exchange. Your ISP backhaul then picks up the traffic there. Many ISPs use BT Wholesale backhaul and then the switchover can happen whenever your new ISP has provisioned your account. TalkTalk usually use their own backhaul so Openreach will switch your logical connection to a different port which will cut off your old ISP.
It's slightly different for ADSL or FTTP. In the case of ADSL many providers have their own DSLAM in the exchange so the cut over happens when your line is rejumpered on the MDF in the exchange. I think FTTP is similar to FTTC with an Openreach Ethernet switch terminating the service at the exchange.
You are reading a single comment by @jellybaby and its replies.
Click here to read the full conversation.
jellybaby
Only for my own interest, As the swap is between 2 providers that both use a BT line what would make it stop working? Couldn't the old router just carry on?
I usually swap between BT and Virgin each time so I have never thought about it.