Architectural changes in the radio access network (RAN) enabled by new functional splits between the baseband unit (BBU) and remote radio head (RRH) bring new possibilities to optimize and scale the network using Cloud-RAN (C-RAN). To help minimize transport costs, particularly in the fronthaul segment, 5G radios use the new Ethernet-based enhanced Common Public Radio Interface (eCPRI) protocol, which permits baseband signal transport over a packet fronthaul network. This enables operators to use statistical multiplexing of packet flows to make transport more efficient. To take full advantage of packet fronthaul, the traffic streams coming from the large installed base of 4G CPRI-based radios and any new 5G CPRI radios must be packetized for transport over Ethernet networks. The IEEE 1914.3 Radio over Ethernet (RoE) standard addresses this need by specifying a transport protocol and encapsulation formats for transporting these time-sensitive radio streams over Ethernet. This white paper explores the capabilities and benefits of the different RoE modes and examines the benefits of gaining visibility into the underlying CPRI streams.