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US 8,184,977 B2Granted
Optical line terminal capable of active bandwidth allocation for passive optical network system
AssigneeHitachi, Ltd.
InventorsTohru Kazawa, Kenichi Sakamoto, Ryosuke Nishino
Life of this patent
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Abstract
In a GPON system conforming to ITU-T Recommendations G.984.3, an optical line terminal is provided which has an active bandwidth allocation function that preferentially puts small bandwidth signals in a particular segment of a frame, e.g., at a head of the frame, to prevent fragmentations that may occur particularly when allocating small bandwidths of about 100 kbits/s.
Claims4
An optical line terminal, or carrier side device, connected through optical transmission lines to a plurality of optical network units (ONUs), or subscriber side devices, the optical line terminal comprising:
- an active bandwidth allocation unit to allocate a data amount that it permits each of the ONUs to transmit to the optical line terminal in a predetermined period;
- and
- a data send permission unit to refer to the data amount that is allocated by the optical line terminal, to allocate a time slot in which data is transmitted to the optical line terminal for each of the ONUs that has the data amount which is smaller than a predetermined value at first then to allocate the time slot to remaining ONUs.
Dependencies are inferred from the claim text.