OPTICAL LINE TERMINAL AND FRAME TRANSFER METHOD

摘要

Out of one constantly fed block (B0) and one power saving block (B1) provided by dividing in advance circuit units constituting an OLT (10), a power supply control unit (40) constantly supplies power to circuit units belonging to the constantly fed block. For circuit units belonging to the power saving block, the power supply control unit starts power supply to the power saving block starts in synchronism with the start of the period of an upstream bandwidth allocated to each ONU, and stops the power supply to the power saving block in synchronism with the end of the period of the upstream bandwidth. The power supply control unit starts power supply at a timing specified based on the start timing of the upstream bandwidth, and stops the power supply at a timing decided based on the end timing of the upstream bandwidth. This reduces the power consumption of an overall OLT.

主权项

1. An OLT comprising:
a reception circuit that receives upstream frames from a plurality of ONUs connected via a PON in periods of upstream bandwidths individually allocated to the respective ONUs; one or a plurality of transmission circuits that are provided for respective preset downstream transmission rates and transmit downstream frames to the ONUs via the PON at the downstream transmission rates; a transmission/reception circuit that transmits the upstream frame to a host apparatus connected via an SNI (Service Node Interface) and receives the downstream frame from the host apparatus via the SNI; a frame demultiplexing unit that demultiplexes the upstream frame received by said reception circuit into an SNI upstream frame to be transferred to the SNI side and a non-SNI upstream frame unnecessary to be transferred to the SNI side; a frame transfer processing unit that transfers the SNI upstream frame demultiplexed by said frame demultiplexing unit to said transmission/reception circuit, and transfers the downstream frame received by said transmission/reception circuit to said transmission circuit; and a power supply control unit that selectively supplies power to a power saving block constituted by at least one circuit unit used for reception processing of the upstream frame, out of circuit units including said reception circuit, said plurality of transmission circuits, said transmission/reception circuit, said frame demultiplexing unit, and said frame transfer processing unit which constitute the OLT, and constantly supplies power to a constantly fed block constituted by a circuit unit other than the power saving block, wherein when supplying power to the power saving block, said power supply control unit starts power supply in synchronism with a start of the period of the upstream bandwidth of each ONU, and stops the power supply in synchronism with an end of the period of the upstream bandwidth.