There is nothing posh about Cambridge Broadband’s business - gear for the boring cellular back haul business. But it sure is one that will keep growing. No wonder the Cambridge, UK-based company was able to raise $22.5 million in new capital from existing investors Amadeus Capital, Accel Partners and TVM Capital, together with new investor Adara Ventures. The company has raised over $65 million and is getting a lot of traction in India.