Method for providing an xDSL broadband transmission service between a central office and a customer premises equipment via a local loop, the method comprising: initiating a handshaking procedure between the central office and the customer premises equipment, wherein the customer premises equipment receives from the central office a profile defining a transmission rate; determining an xDSL transmission standard with a specified transmission rate during the handshaking procedure for providing the xDSL broadband transmission service, characterised in that the method comprises: utilizing a non-standard information field during the handshaking procedure to indicate a support of a non-standard mode between the central office and the customer premises equipment, wherein the non-standard mode allows the customer premises equipment to overrule the profile; initiating the non-standard mode, in case no synchronization is established between the central office and the customer premises equipment after the handshaking procedure, reducing the transmission rate below a lowest transmission rate as defined in said xDSL standard and trying again to establish synchronization for said broadband transmission service, and in case synchronization is established, providing a non-standard transmission with reduced transmission rates for feeding back to the central office diagnostic information about the local loop. initiating a handshaking procedure between the central office and the customer premises equipment, wherein the customer premises equipment receives from the central office a profile defining a transmission rate; determining an xDSL transmission standard with a specified transmission rate during the handshaking procedure for providing the xDSL broadband transmission service, characterised in that the method comprises: utilizing a non-standard information field during the handshaking procedure to indicate a support of a non-standard mode between the central office and the customer premises equipment, wherein the non-standard mode allows the customer premises equipment to overrule the profile; initiating the non-standard mode, in case no synchronization is established between the central office and the customer premises equipment after the handshaking procedure, reducing the transmission rate below a lowest transmission rate as defined in said xDSL standard and trying again to establish synchronization for said broadband transmission service, and in case synchronization is established, providing a non-standard transmission with reduced transmission rates for feeding back to the central office diagnostic information about the local loop. utilizing a non-standard information field during the handshaking procedure to indicate a support of a non-standard mode between the central office and the customer premises equipment, wherein the non-standard mode allows the customer premises equipment to overrule the profile; initiating the non-standard mode, in case no synchronization is established between the central office and the customer premises equipment after the handshaking procedure, reducing the transmission rate below a lowest transmission rate as defined in said xDSL standard and trying again to establish synchronization for said broadband transmission service, and in case synchronization is established, providing a non-standard transmission with reduced transmission rates for feeding back to the central office diagnostic information about the local loop.