Zayo Group Holdings, Inc. is a provider of communications and bandwidth infrastructure in the United States, Canada and Europe. Its products include leased dark fiber, fiber to cellular towers and small cell sites, dedicated Wavelength connections, Ethernet, Internet Protocol (IP) connectivity, data center colocation, cloud offerings and other bandwidth offerings. The Company provides its products and offerings through four segments: Zayo Networks, including dark fiber, mobile infrastructure solutions, Ethernet, wavelength, wholesale IP, SONET solutions, private lines and dedicated Internet; Zayo Colocation (zColo), including provision of colocation space and power and interconnection offerings and cloud-based computing offerings; Allstream, including Cloud VoIP and Data Solutions, and Other offerings, including Zayo Professional Services (ZPS).