HC & C Communications Inc. is a voice and data communications company that has been in operation since 1990. It offers a range of services, such as installation and maintenance and planning and development. Located in Oakland, Calif., the planning and development services include design layout, site surveys and project management. The company is involved in the design and building server rooms and telco closets. HC & C Communications Inc. serves the needs of residential, commercial and industrial businesses.. Cabling; Data,Voice & Fiber. Ceiling plenum clean-up. New Office build-out. Equipment relocation & install. Project Management. Site surveys. Network design & layout.