The Group's principal activities are to provide engineering and installation on-site services and to design and manufacture communications power systems and equipment. It operates in two segments: Product and Service. The Product segment consists of manufacturing operations and the production of power plants, rectifiers and power distribution equipment. The Service segment consists of telecommunications contract, engineering, and installation services. It also offers systems integration products to the communications industry. The products include power systems, power distribution equipment and systems integration products and related services. The Engineering & Installation on-site services include engineering and installation management, power monitoring systems, applications software and customized products to meet customer needs.