Station-side apparatus in optical transmission system, optical transmission system, and optical transmission method
First Claim
1. A station-side apparatus in an optical transmission system, for transferring frames between a host apparatus and a plurality of subscriber-side apparatuses connected via first to Nth (N≥
- 2) optical splitters, comprising;
first to Nth optical transceivers that are connected to the first to Nth optical splitters in one-to-one correspondence, and each perform electro-optical conversion of a downstream electrical signal into an optical signal to be output to the subscriber-side apparatuses and photoelectric conversion of an optical signal from one of the subscriber-side apparatuses into an upstream electrical signal;
a selection and distribution circuit that selects one of the first to Nth optical transceivers and outputs an upstream electrical signal input from the selected one of the optical transceivers while distributing and outputting the downstream electrical signal to the first to Nth optical transceivers; and
a control circuit that controls the plurality of subscriber-side apparatuses not to transmit upstream frames at the same time while controlling the selection and distribution circuit,the selection and distribution circuit includinga selection control unit that selects one of the first to Nth optical transceivers based on a timing of a discovery window for waiting for reception of a registration request frame from an unregistered subscriber-side apparatus, a timing of a grant as a reception period of an upstream frame from a registered subscriber-side apparatus, and a logical link identification number for a logical link with the registered subscriber-side apparatus assigned to the grant, all of which are transmitted from the control circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
An OLT (1) is formed by N optical transceivers (11), one PON control circuit (12), and one selection and distribution circuit (13). An optical transceiver selection control signal (SC) is transferred from the PON control circuit (12) to the selection and distribution circuit (13). The optical transceiver selection control signal (SC) indicates the timing of a discovery window, the timing of a grant, and a logical link identification number of a registered ONU assigned to the grant (a logical link identification number for a logical link with the registered ONU). The selection and distribution circuit (13) selects one optical transceiver (11-s (s is an integer falling within a range of 0 to N−1)) from the optical transceivers (11-0 to 11-N−1) based on the optical transceiver selection control signal (SC) from the PON control circuit (12).
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Citations
7 Claims
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1. A station-side apparatus in an optical transmission system, for transferring frames between a host apparatus and a plurality of subscriber-side apparatuses connected via first to Nth (N≥
- 2) optical splitters, comprising;
first to Nth optical transceivers that are connected to the first to Nth optical splitters in one-to-one correspondence, and each perform electro-optical conversion of a downstream electrical signal into an optical signal to be output to the subscriber-side apparatuses and photoelectric conversion of an optical signal from one of the subscriber-side apparatuses into an upstream electrical signal; a selection and distribution circuit that selects one of the first to Nth optical transceivers and outputs an upstream electrical signal input from the selected one of the optical transceivers while distributing and outputting the downstream electrical signal to the first to Nth optical transceivers; and a control circuit that controls the plurality of subscriber-side apparatuses not to transmit upstream frames at the same time while controlling the selection and distribution circuit, the selection and distribution circuit including a selection control unit that selects one of the first to Nth optical transceivers based on a timing of a discovery window for waiting for reception of a registration request frame from an unregistered subscriber-side apparatus, a timing of a grant as a reception period of an upstream frame from a registered subscriber-side apparatus, and a logical link identification number for a logical link with the registered subscriber-side apparatus assigned to the grant, all of which are transmitted from the control circuit. - View Dependent Claims (2, 3, 4, 5)
- 2) optical splitters, comprising;
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6. An optical transmission system comprising first to Nth (N≥
- 2) optical splitters, a plurality of subscriber-side apparatuses connected to the first to Nth optical splitters, and a station-side apparatus that transfers frames between a host apparatus and the plurality of subscriber-side apparatuses connected to the first to Nth optical splitters,
the station-side apparatus comprising first to Nth optical transceivers that are connected to the first to Nth optical splitters in one-to-one correspondence, and each perform electro-optical conversion of a downstream electrical signal into an optical signal to be output to the subscriber-side apparatuses and photoelectric conversion of an optical signal from one of the subscriber-side apparatuses into an upstream electrical signal, a selection and distribution circuit that selects one of the first to Nth optical transceivers and outputs an upstream electrical signal input from the selected one of the optical transceivers while distributing and outputting a downstream electrical signal to the first to Nth optical transceivers, and a control circuit that controls the plurality of subscriber-side apparatuses not to transmit upstream frames at the same time while controlling the selection and distribution circuit, and the selection and distribution circuit including a selection control unit that selects one of the first to Nth optical transceivers based on a timing of a discovery window for waiting for reception of a registration request frame from an unregistered subscriber-side apparatus, a timing of a grant as a reception period of an upstream frame from a registered subscriber-side apparatus, and a logical link identification number for a logical link with the registered subscriber-side apparatus assigned to the grant, all of which are transmitted from the control circuit.
- 2) optical splitters, a plurality of subscriber-side apparatuses connected to the first to Nth optical splitters, and a station-side apparatus that transfers frames between a host apparatus and the plurality of subscriber-side apparatuses connected to the first to Nth optical splitters,
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7. An optical transmission method of transferring frames between a host apparatus and a plurality of subscriber-side apparatuses connected to first to Nth (N≥
- 2) optical splitters in a station-side apparatus by providing the first to Nth optical splitters, the plurality of subscriber-side apparatuses connected to the first to Nth optical splitters, and the station-side apparatus provided between the host apparatus and the first to Nth optical splitters, the method comprising;
providing, to the station-side apparatus, first to Nth optical transceivers that are connected to the first to Nth optical splitters in one-to-one correspondence, and each perform electro-optical conversion of a downstream electrical signal into an optical signal to be output to the subscriber-side apparatuses and photoelectric conversion of an optical signal from one of the subscriber-side apparatuses into an upstream electrical signal, a selection and distribution circuit that selects one of the first to Nth optical transceivers and outputs an upstream electrical signal input from the selected one of the optical transceivers while distributing and outputting a downstream electrical signal to the first to Nth optical transceivers, and a control circuit that controls the plurality of subscriber-side apparatuses not to transmit upstream frames at the same time while controlling the selection and distribution circuit; and selecting, by the selection and distribution circuit, one of the first to Nth optical transceivers based on a timing of a discovery window for waiting for reception of a registration request frame from an unregistered subscriber-side apparatus, a timing of a grant as a reception period of an upstream frame from a registered subscriber-side apparatus, and a logical link identification number for a logical link with the registered subscriber-side apparatus assigned to the grant, all of which are transmitted from the control circuit.
- 2) optical splitters in a station-side apparatus by providing the first to Nth optical splitters, the plurality of subscriber-side apparatuses connected to the first to Nth optical splitters, and the station-side apparatus provided between the host apparatus and the first to Nth optical splitters, the method comprising;
Specification