Patent ID: 9094150
Filing Date: 2015-07-28
Classification: H04J,H04Q

Abstract:
1. A method of registering an unregistered optical network unit (ONU) in a telecommunications network which comprises an optical line terminal (OLT) including a plurality of optical subscriber units (OSUs) and at least one ONU connected to the OLT, the ONU including a variable-wavelength (VW) filter, the plurality of OSUs transmitting a signal on different wavelengths specifically assigned to the respective OSUs, said method comprising: periodically transmitting by the plurality of OSUs a bandwidth allocation signal at a first period to each of the ONUS connected to the OLT; transmitting by at least one of the OSUs an acknowledgement request signal to the ONU at a second period having a value corresponding to the first period multiplied by a constant; determining by the unregistered ONU, if the ONU is registered in none of the OSUs, the first period for receiving the bandwidth allocation signal on a basis of a reception interval of the bandwidth allocation signal, and then calculating the second period on the basis of the first period; periodically changing by the unregistered ONU a transmissive wavelength of the VW filter in the unregistered ONU at a third period longer than the calculated second period; receiving the acknowledgement request signal by the unregistered ONU; and registering by the OSU having transmitted the acknowledgement request signal the unregistered ONU having received the acknowledgement request signal.