There are three layers to the network, and each layer has different responsibilities and uses different frequencies: core, distribution, and access.
The core layer is the backbone of the network. Its primary responsibility is switching and routing of traffic and primarily consists of point to point links. Various microwave frequencies are used at the core: 18GHz, 11GHz, e-band (70/80GHz) and 5GHz. or available fiber assets. Different frequencies are used for different link distances. Bandwidths of up to 10/100Gb/s are realistic expectations over fiber.
The distribution layer consists primarily of point to multipoint and mesh solutions. This layer is responsible for providing bandwidth to the access layer. 5.xGHz frequencies are used at the distribution layer with each base station providing bandwidths of up to 400Mb/s. Available fiber assets are utilized for higher bandwidth applications.
The final layer is the access layer. This is the layer where access points provide the required Internet services (i.e. Content, web, e-mail, etc.) to the end users. 802.11a/b/g/n/ac are the protocols supported in the 2.4 and 5.xGHz frequency bands providing approximately 100Mb/s of real data throughput for each access point. Available fiber assets are utilized for high speed backhaul and fronthaul.