METHOD FOR REGISTERING OPTICAL NETWORK UNIT IN TELECOMMUNICATIONS NETWORK AND OPTICAL NETWORK UNIT THEREFOR

摘要

In a telecommunications network including an optical line terminal (OLT) having optical subscriber units (OSUs) and an optical network unit (ONU) connected to the OLT, bandwidth allocation signals are periodically transmitted at a first period from the respective OSUs to the ONU, and an acknowledgement request signal is transmitted from at least one of the OSUs to the ONU at a second period having a value corresponding to the first period multiplied by a constant. If an ONU is registered in none of the OSUs, the first period is determined from reception intervals of the assignment signals, and a second period is calculated from the first period. Transmissive wavelength of a variable-wavelength (VW) filter in the ONU is periodically changed at a third period longer than the second period. In the OSU having transmitted the request signal, the unregistered ONU having received the request signal is registered.

主权项

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.