For BT to make it even more confusing, there are 2 variants of Type A; one for FTTC and one for FTTP (though, they might actually the same device, with small modification in FTTP to connect have one of the LAN ports used as WAN to connect to the modem instead of the dedicated RJ11 port that is used for broadband in the FTTC variant.
Type B is only FTTC.
Type A FTTC:
Type A FTTP:
Type B FTTC:
