(Reuters) - U.S. communications infrastructure provider Zayo Group Holdings Inc said on Wednesday it has agreed to be taken private by investment firms Digital Colony Partners LP and EQT for about $8.2 billion in cash. Zayo operates a 209,214 km fiber network in the United States and Europe to connect data centers and serves wireless and landline phone companies. It stands to benefit from rising demand for bandwidth in their markets, driven by cloud computing and streaming.