At the following URLs there are Visio and JPEG drawings of 3 common LVDS buss topologies (Point to Point, Multi-Drop, and Multi-point) that might be found on a backplane. Each comes with it’s own challenges and problems.
http://www.hamsdr.com/dnld.aspx?id=144 (Visio format)
In the case of the Point to Point topology there is a single driver on the buss and multiple receivers. In the Multi-Point topologies there can be multiple drivers as well as multiple receivers. If I am interpreting the Janus and Lionheart block diagrams correctly it seems that the currently envisioned topology is point-to-point (Janus and Lionheart only). With the desire for extra backplane slots it looks like Multi-Drop. Are there applications envisioned in the future that might place multiple drivers on the buss in the Multi-point topology?