Patent ID: 8254292

Claim:
A passive optical network PON system comprising an optical line terminal OLT, an optical network unit ONU connected with the optical line terminal OLT through a network ODN and a storage device having been provided within the optical network unit ONU for storing data, (A) wherein the optical network unit ONU further comprises: 1) a first data transmission/reception unit for exchanging data with the optical line terminal OLT, 2) a data determination unit for determining data to be stored in data having been received by the first data transmission/reception unit, and for controlling the data to be stored into the storage device, and 3) a second data transmission/reception unit for exchanging data with a terminal having been connected with the optical network unit ONU, and (B) wherein the data determination unit is arranged to: 1) judge whether a terminal connected to the optical network unit ONU has transmitted a request with respect to the data, 2) control the data to be stored in the storage device in case no request has yet been sent, and 3) send the data to the terminal without being stored in the storage device if the request has been sent with respect to the data.