This Recommendation describes a method for bonding of multiple digital subscriber lines (DSL) to transport ATM streams. The specifications of this Recommendation provide a complete description of startup, operational, and contingency modes of operation which allows for interoperability between vendors. This Recommendation includes the following types of requirements, recommendations, and information for defined DSL systems, including: - higher-layer transport-independent requirements, - higher-layer transport-dependent, e. g., ATM, requirements.