FTTA is a broadband network architecture to connect the building base band unit (BBU) to the remote radio unit (RRU) at the top of the tower by using optical fibers to replace part or all of the coaxial network. FTTA technology can greatly reduce the loss of signal power. And up to 20km’s maximum transmission distance helps realize centralized placement of base stations in lower-cost telecommunication rooms as well as more flexible and modularized network planning.