PMC - Sierra Inc. The Group's principal activity is to design, develop, market and support high-performance semiconductor networking solutions. The Group's products are used in the high-speed transmission and networking systems, which are being used to modify the global telecommunications and data communications infrastructure. The products of the Group includes, line interface units, framers and mappers, packet & cell processors, traffic managers and switch fabrics, serializers/deserializers and microprocessors. Networking products accounted for 98% of 2002 revenues and non-networking products, 2%.