Increasing its foothold on the Eastern Seaboard, Communications Supply Corp., Carol Stream, Ill., purchased Communication Products Unlimited (CPU). CPU, Gaithersburg, Md., with one location and 27 employees, distributes communication infrastructure products, including cable, fiber optics, network electronics and other related communication products. Under the deal, CPU will operate as a stand-alone operation within CSC. Lee Osterman will remain as CPU's general manager and all of CPU's staff will remain in their current positions.