Chicago-based Ameritech Corp has signed a five year agreement to make Reliance Comm/Tech Corp the exclusive provider of telecommunications power systems for its network services unit: Reliance Comm/Tech’s Lorain Products Division, which is based in Lorain, Ohio, will supply the required power hardware systems while the company’s Lorain-based Network Services Division will design, provision, install and manage power equipment such as DC systems, emergency engines and battery plants; the pact is said to be worth over $100m.