It should be remembered that the early development of the standard was also driven
partly by the need to provide a standardized technology to backhaul cellular traffic.
As was stated earlier, the SC-PHY standard was developed primarily for backhaul applications,
and it is still the most suitable standard to be used for backhauling cellular
traffic. This is primarily because the majority of cellular sites are either on top of large
buildings and towers that are likely to be in line-of-sight of another building or tower
with access to a wired infrastructure. In addition, all the reasons presented in favor of
SC-PHY for fiber-extension applications apply equally well to this application also. The
backhaul of cell towers could be provided by installing a BS on the rooftop of a building
with access to a wired backhaul facility and installing SSs on the rooftops of cell-sites
buildings or on top of cell towers.
The cost of deploying WiFi has come down considerably in the past few years, allowing
for large ubiquitous use of the technology and a widespread deployment of WiFi
hotspots. However, the cost of backhauling a hotspot remains the single biggest cost
for hotspot operators.
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