Following up on my initial Motorola (MOT) post yesterday, here are my numbers on the company's networking and mobility (non cell phone) segment. With MOT shares languishing near multi-year lows at nine dollars, doing individual valuations on both segments that will be spun off next year can help us figure out if there is much downside left in the stock.

My calculation is meant to be realistic, rather than overly conservative or aggressive. I get to about $8 per share for Motorola's non cell phone business, which just shows you how little faith Wall Street has in the cell phone segment right now. Let me know if you think tweaks in my numbers are warranted.

Full Disclosure: No position in MOT at the time of writing