Communication system and OLT system
AssigneeNippon Telegraph and Telephone Corporation
InventorsTomoya Hatano, Keita Takahashi, Naotaka Shibata, Hiroko Nomura
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Abstract
A communication system of a passive optical communication network includes an optical line terminal (OLT) system including a first OLT, a second OLT, and an OLT control device that controls the first OLT and the second OLT, a plurality of splitters that connects between the first OLT and the second OLT with an optical communication path, and an optical network unit (ONU) that is connected to each of the plurality of splitters with an optical communication path.
Claims19
A communication system of a passive optical communication network, the communication system comprising:
- an optical line terminal (OLT) system including a first OLT, a second OLT, and an OLT control device configured to control the first OLT and the second OLT;
- a plurality of splitters configured to connect between the first OLT and the second OLT with an optical communication path, both ends of the optical communication path being connected to the first OLT and the second OLT, respectively;
- and
- an optical network unit (ONU) connected to a splitter of the plurality of splitters with an optical communication path, the ONU having a first light meter, a second light meter, and an ONU controller,
- wherein during normal communication where no failure is detected in the passive optical communication network including the OLT system, the plurality of splitters, and the ONU, the OLT control device is configured to cause the first OLT and the second OLT to transmit first and second downlink optical signals toward the ONU, respectively,
- the first light meter is configured to receive the first downlink optical signal via the splitter to output first light intensity information corresponding to an intensity of the first downlink optical signal to the ONU controller,
- the second light meter is configured to receive the second downlink optical signal via the splitter to output second light intensity information corresponding to an intensity of the second downlink optical signal to the ONU controller, and
- the ONU controller is configured to:
- determine which one of the first and second light intensity information has a higher intensity value;
- pass a selected downlink optical signal among the first and second downlink optical signals to an external device, wherein the selected downlink optical signal has the higher intensity value;
- and
- notify the OLT system about assignment information indicating one of the first and second OLTs to which the ONU is assigned, wherein the one of the first and second OLTs transmits the selected downlink optical signal having the higher intensity value.
Dependencies are inferred from the claim text.