rru access module can be set via software control to meet desired capacity and throughput objectives or wireless subscriber needs the detailed topology of the remote radio head unit access module is shown in fig5 it comprises a small form factor pluggable optic transceiver sfp 500 which operates on two distinct wavelengths one for communicating from the bts to the remote radio head unit access module and the other for communicating in the opposite direction the sfp contains a laser diode for converting the electronic signal to an optical signal and an optical detector for converting the optical signal into an electronic signal a multiplexer demultiplexer 501 converts the high speed data to multiple lower speed data paths for delivery to a fpga 502 the multiplexer demultiplexer 501 performs the opposite function when data is being sent back to the bts or dau the framer deframer 503 routes the data to the appropriate remote radio head unit band modules an additional multiplexer demultiplexer 506 allows for further expansion of lower speed remote radio head units the number of remote radio head units is only limited by the capability of the fpga local communication with the remote radio head unit 39 s access module 39 s.