Method for initiating a non-standard mode for an xDSL transmission system and residential gateway using the method

1. 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,

determining an xDSL transmission standard with a specified transmission rate during the handshaking procedure for providing the xDSL broadband transmission service,

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,

initiating the non-standard mode, in case no synchronization is established between the central office and the customer premises equipment after the handshaking procedure, and 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 subsequently established, providing a non-standard transmission with reduced transmission rate for feeding diagnostic information about the local loop back to the central office.

2. The method of claim 1 , comprising: reducing the transmission rate of the upstream and/or downstream link of the selected xDSL transmission mode by a defined factor and trying again to establish synchronization for said broadband transmission service.

3. The method of claim 2 , comprising: reducing the transmission rates of the upstream and/or downstream link of the selected xDSL transmission standard in consecutive steps until synchronization is established.

4. The method of claim 1 , comprising: reducing the transmission rate below the transmission rate as defined in a profile provisioned by the central office.

5. The method of claim 1 , comprising: iteratively feeding back to the central office different values of impulse noise protection and/or delay until synchronization for said xDSL broadband transmission service is established.

6. The method according to claim 1 , wherein the xDSL transmission standard is an ADSL, ADSL2, ADSL2+ or VDSL transmission standard.

7. Method for providing an xDSL broadband transmission service between a central office and a customer remises equipment via a local loop, the method comprising:

initiating a handshaking procedure between the central office and the customer premises equipment,

determining an xDSL transmission standard with a defined transmission rate during the handshaking procedure for providing the xDSL broadband transmission service,

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,

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 said transmission rate and checking again whether synchronization is established, and

in case no synchronization is obtained, reducing said transmission rate consecutively in further steps, until a synchronization is established for said broadband transmission service.

8. The method of claim 7 , further comprising: reducing the transmission rate below the lowest transmission rate as defined in said xDSL standard.

9. The method of claim 7 , further comprising: reducing the transmission rate below the transmission rate as defined in a profile provisioned by the central office.

10. A residential gateway being configured to provide an xDSL broadband transmission service between a central office and the residential gateway via a local loop, and being configured to:

initiate a handshaking procedure between the central office and the customer premises equipment,

determine an xDSL transmission standard with a specified transmission rate during the handshaking procedure for providing the xDSL broadband transmission service,

utilize 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,

initiate the non-standard mode, in case no synchronization is established between the central office and the customer premises equipment after the handshaking procedure,

reduce said transmission rate and check again whether synchronization is established, and

feed diagnostic information about the local loop back to the central office.

11. The residential gateway of claim 10 , wherein the non-standard mode is implemented in a memory of the residential gateway to overrule a proposed profile of the central office.

12. The residential gateway of claim 10 , wherein the gateway is further configured to reduce said transmission rate consecutively, in case no synchronization is obtained, until a synchronization is established for said broadband transmission service.

13. The residential gateway of claim 10 , wherein the gateway is further configured to reduce the transmission rate below the transmission rate as defined in a profile provisioned by the central office.

14. The residential gateway of claim 10 , wherein the gateway is further configured to iteratively feed back to the central office different values of impulse noise protection and/or delay until synchronization for said xDSL broadband transmission service is established.

15. The residential gateway of claim 10 , wherein the xDSL transmission standard is an ADSL, ADSL2, ADSL2+ or VDSL transmission standard.