The present invention relates to a transceiver unit in a PON, Passive Optical Network, for receiving an optical input signal and transmitting an amplitude modulated optical output signal. Preferably, only one sandbox is used. An adhesive used in the composite panel fabrication process is added to fibers. This first end is deflectable for radial insertion of the at least one cable winding within the first bore. The FFT butterfly instruction can be used in the software on a processor in a chip-set implementing the central-office modem end of a DSL link. The eNB assigns the subject downlink RBG to a UE 200 that transmitted a specific SRS that is SRS having the highest match rate in a frequency band with the subject downlink RBG, out of a plurality of SRSs received recently before the subject downlink RBG.