Lonworks has a few different topologies available, I believe the most common is the Free Topology, aka FFT-10.
I've got a file I downloaded from Echelon regarding the Free Topology wiring guidelines. It has a number on it 005-0023-01, it is classified as an engineering bulletin. It has recommended cable manufacturers part numbers, as
well as distances and wiring diagrams.
Cable lengths also depend on the transceiver type and wire type. For example, the FTT-10 is qualified over a number of different wire types and the distances depend on wire type. The FTT-10 can communicate over just about any wire type, but Echelon hasn't tested and quantified the distances except for more common wire types. Those wire types and distances are also
specified in the same wiring guidelines application note show above.