There are many, many more patents in the Nortel portfolio. Intel is very, very deep in computer, silicon technology and even wired network patents. Patents are a DETERRENT to getting sued in a particular industry. For SoC silicon that Intel is planning, there are a number of patent toes that could be stepped on.
Important patents in their portfolio would provide value against lawsuits even if they were not building something in that area. Think of important patents as having intrinsic bargaining value.