Station-side apparatus and frame transfer apparatus

A station-side apparatus comprising:

• a reception circuit that receives an upstream frame from a subscriber-side apparatus connected via an optical transmission channel;
• a transmission/reception circuit that transmits the upstream frame to a host apparatus connected via an interface and receives a downstream frame from the host apparatus via the interface;
• a plurality of transmission circuits that are provided in correspondence with a plurality of transmission systems, respectively, and transmit the downstream frame to the subscriber-side apparatus via the optical transmission channel at transmission speeds preset via the optical transmission channel;
• a frame transfer processing unit that transfers the upstream frame received by said reception circuit to said transmission/reception circuit and transfers the downstream frame received by said transmission/reception circuit to said transmission circuits;
• and
• a table in which a destination ID for identifying one of a user apparatus and the subscriber-side apparatus serving as a destination of the downstream frame, identifier information for identifying one of the subscriber-side apparatus to which the user apparatus is connected and the subscriber-side apparatus serving as the destination, and transfer instruction information indicating the transmission system of an output destination of the downstream frame are registered in association with each other,
• wherein said frame transfer processing unit acquires, from said table, the identifier information and the transfer instruction information associated with the destination ID of the downstream frame received by said transmission/reception circuit, gives the identifier information to the downstream frame, and transfers the downstream frame to, out of said plurality of transmission circuits, said transmission circuit of the transmission system indicated by the transfer instruction information,
• further comprising a plurality of buffers provided for the plurality of transmission systems, respectively,
• wherein said frame transfer processing unit acquires, from said table, the identifier information and the transfer instruction information associated with the destination ID of the downstream frame received by said transmission/reception circuit, writes the identifier information and the transfer instruction information in the downstream frame, writes the downstream frame in said buffer of the transmission system indicated by the transfer instruction information written in the downstream frame, reads out the downstream frame written in said buffer, and transfers the downstream frame to said transmission circuit of the transmission system to which said buffer belongs.

A station-side apparatus comprising:

• a reception circuit that receives an upstream frame from a subscriber-side apparatus connected via an optical transmission channel;
• a transmission/reception circuit that transmits the upstream frame to a host apparatus connected via an interface and receives a downstream frame from the host apparatus via the interface;
• a plurality of transmission circuits that are provided in correspondence with a plurality of transmission systems, respectively, and transmit the downstream frame to the subscriber-side apparatus via the optical transmission channel at transmission speeds preset via the optical transmission channel;
• a frame transfer processing unit that transfers the upstream frame received by said reception circuit to said transmission/reception circuit and transfers the downstream frame received by said transmission/reception circuit to said transmission circuits;
• and
• a table in which a destination ID for identifying one of a user apparatus and the subscriber-side apparatus serving, as a destination of the downstream frame, identifier information for identifying one of the subscriber-side apparatus to which the user apparatus is connected and the subscriber-side apparatus serving as the destination, and transfer instruction information indicating, the transmission system of an output destination of the downstream frame are registered in association with each other,
• wherein said frame transfer processing unit acquires, from said table, the identifier information and the transfer instruction information associated with the destination ID of the downstream frame received by said transmission/reception circuit, gives the identifier information to the downstream frame, and transfers the downstream frame to, out of said plurality of transmission circuits, said transmission circuit of the transmission system indicated by the transfer instruction information, further comprising:
• an upstream input unit that writes, in the upstream frame, downstream output speed information associated in advance with the identifier information written in the upstream frame from the subscriber-side apparatus;
• and
• a transmission source ID registration unit that confirms whether the transmission source ID written in the upstream frame from the subscriber-side apparatus to identify one of the user apparatus and the subscriber-side apparatus of a transmission source of the upstream frame is registered in said table, and when the transmission source ID is not registered in said table, registers the downstream output speed information written in the upstream frame in said table as the transfer instruction information in association with the transmission source ID written in the upstream frame and the identifier information.

A station-side apparatus comprising:

• a reception circuit that receives an upstream frame from a subscriber-side apparatus connected via an optical transmission channel;
• a transmission/reception circuit that transmits the upstream frame to a host apparatus connected via an interface and receives a downstream frame from the host apparatus via the interface;
• a plurality of transmission circuits that are provided in correspondence with a plurality of transmission systems, respectively, and transmit the downstream frame to the subscriber-side apparatus via the optical transmission channel at transmission speeds preset via the optical transmission channel;
• a frame transfer processing unit that transfers the upstream frame received by said reception circuit to said transmission/reception circuit and transfers the downstream frame received by said transmission/reception circuit to said transmission circuits;
• and
• a table in which a destination ID for identifying one of a user apparatus and the subscriber-side apparatus serving as a destination of the downstream frame identifier information for identifying one of the subscriber-side apparatus to which the user apparatus is connected and the subscriber side apparatus serving as the destination, and transfer instruction information indicating the transmission system of an output destination of the downstream frame are registered in association with each other,
• wherein said frame transfer processing unit acquires, from said table, the identifier information and the transfer instruction information associated with the destination ID of the downstream frame received by said transmission/reception circuit, gives the identifier information to the downstream frame, and transfers the downstream frame to, out of said plurality of transmission circuits, said transmission circuit of the transmission system indicated by the transfer instruction information, further comprising:
• a plurality of input FIFOs and output FIFOs provided for each of the plurality of transmission systems;
• and
• a memory that stores frame data of the downstream frame,
• wherein said frame transfer processing unit acquires, from said table, the identifier information and the transfer instruction information associated with the destination ID of the downstream frame received by said transmission/reception circuit, writes the identifier information and the transfer instruction information in the downstream frame, and writes the downstream frame in one of said input FIFO and said output FIFO of the transmission system indicated by the transfer instruction information written in the downstream frame, and simultaneously controls transfer of the frame data from said input FIFO to said output FIFO, transfer of the frame data from said input FIFO to said memory, and transfer of the frame data from said memory to said output FIFO in accordance with internally generated control information, reads out the downstream frame written in said output FIFO, and transfers the downstream frame to said transmission circuit of the transmission system to which said output FIFO belongs.