Xelerated, a maker of networking chip sets for carriers, has raised a $13 million round from its existing investors.

Sixth Swedish National Pension Fund led the round. Others included Accel Partners, Alta Partners, Amadeus Capital Partners and Atlas Ventures.

The company said in a news release that proceeds of the round will be used to develop its network processors and Ethernet switching chips. It will also expand sales and support overseas. The company’s chips are application-specific standard products, which can be customized for a number of different communications functions.

The Stockholm-based company has raised $93 million in venture capital since 2000. We previously wrote about a round in 2007.