| CPC H04Q 11/0067 (2013.01) [H04B 10/614 (2013.01); H04Q 2011/0079 (2013.01)] | 10 Claims |
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1. A communication system for a passive optical network, comprising:
an OLT system including a first OLT (Optical Line Terminal) and a second OLT, the first and second OLTs being configured to output first and second downstream optical signals to first and second ends of a trunk communication line, respectively, the trunk communication line being divided into a plurality of line sections by a plurality of splitters, the first OLT being connected to the second OLT via the plurality of line sections and the plurality of splitters, the plurality of line sections and the plurality of splitters being connected one another in series; and
a plurality of ONU (Optical Network Unit) systems optically connected to the plurality of splitters at an upstream side and electrically connected to a plurality of subordinate devices at a downstream side, respectively, each of the plurality of ONU systems including:
a first session establishing interface configured to establish a session with the first OLT via one of the plurality of splitters, the first session establishing interface passing the first downstream optical signal therethrough once the session is established;
a second session establishing interface configured to establish a session with the second OLT via the one of the plurality of splitters, the second session establishing interface passing the second downstream optical signal therethrough once the session is established; and
an ONU configured to:
receive one of the first and second downstream optical signals;
convert the one of the first and second downstream optical signals into a downstream electric signal and provide the downstream electric signal to one of the plurality of subordinate devices; and
convert an upstream electric signal from the one of the plurality of subordinate devices into an upstream optical signal and provide the upstream optical signal to one of the first and second OLTs via one of the first and second session establishing interfaces and the one of the plurality of splitters,
wherein each of the plurality of splitters is configured to distribute one of the first and second downstream optical signals to the ONU connected to the each of the plurality of splitters and either another of the plurality of splitters or one of the first and second OLTs, and
each of the plurality of splitters is configured to:
output the first downstream optical signal to the ONU connected to the each of the plurality of splitters via a first path; and
output the second downstream optical signal to the ONU connected to the each of the plurality of splitters via a second path different from the first path.
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