Method and data transmission device for data transmission within an xDSL data transmission system connecting at least two ethernet networks via xDSL links

A data transmission method for transmitting data within an xDSL data transmission system which comprises at least two xDSL data transmission devices connecting at least two Ethernet networks to the xDSL data transmission system, comprising:

• using a respective xDSL data transmission frame according to a first protocol stack for transmitting payload data via a transmission link provided between two adjacent xDSL data transmission devices, in which additionally an embedded operations channel is provided according to the first protocol stack;
• providing a second protocol stack different from the first protocol stack according to which an access to the embedded operations channel within an xDSL data transmission device is executed independently of any access to the payload data;
• and
• subsequently adding management data for diagnostics and configuration of the xDSL data transmission system to the embedded operations channel independently of the payload data of the xDSL data transmission frame, transferring them therein, and reading them out therefrom;
• wherein, based on the execution according to the second protocol stack and in response to management data read from the embedded operations channel for operating a redundant ring configuration, blocking access of an xDSL data transmission device to an xDSL transmission link connected with this xDSL data transmission device with respect to payload data of the xDSL data transmission frame, while maintaining access to said xDSL transmission link with respect to management data of the embedded operations channel.