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US 2008/0279554 A1Published application
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.
Claims8
An optical line terminal, or carrier side device, connected through a coupler module to a plurality of optical network units (ONUs), or subscriber side devices, the optical line terminal comprising:
- an active bandwidth allocation unit to determine a data length that it permits each of the ONUs to transmit in a first period;
- and
- a data send permission unit to determine an order of the plurality of ONUs according to the transmission-permitted data length determined by the active bandwidth allocation unit and to determine, in the determined order, a data transmission timing for each of the plurality of ONUs in a plurality of second periods shorter than the first period.
Dependencies are inferred from the claim text.