If you have a
FFTC Broadband service, it is identical for every ISP / CP who ultimately provides it. They are just reselling
Openreach's NGA GEA service and the link to / from you from / to the cabinet is
VDSL2, using the metallic pair.
The modem installed for a
FTTC service is either the
Huawei HG612 or the
ECI B-FOCuS and they both are configured identically. They operate in pure bridge mode, just translating the physical presence of the signal from
VDSL2 to
Ethernet. Hence all service authentication is performed by the ISP / CP provided router. If the EU does not want (or need) to use the provided router, one system can be connected directly to the modem. That system will have to provide the service authentication details (normally provided by the router) and, most importantly, will need to have a reliable firewall (which would have been provided by the router).
If, like
Asbokid and myself, you do not have a
FTTC Broadband service but have either an
ADSL2+,
ADSL2 or
G.Dmt service and have purchased a
Huawei HG612 to use as a
Broadcom based modem / router, then the (unfinished) documentation within the
Kitz wiki on the
Huawei EchoLife HG612 Home Gateway should be consulted. (
b*cat acknowledges that he must finish that article . . .
)