JP2005354185A - Packet-switching apparatus and control method of packet-switching apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packet-switching apparatus for eliminating the need for an optical switch and reducing the cost, without generating a retiming control signal. <P>SOLUTION: The packet switching apparatus includes one input interface body 10 or more having either function of a station side apparatus and a subscriber side apparatus in a PON system, to which an input line is connected and receiving transmission data including communication packets from the input line; one or more output interface body 30 having the other function of the station side apparatus and the subscriber side apparatus in the PON system, to which an output line is connected and outputting the transmission data from the input interface body (bodies) 10; and an optical fiber transmission line 20 for optically interconnecting the input interface body (bodies) 10 and the output interface body (bodies) 30, and the transmission carried out between the input interface body (bodies) 10 and the output interface body (bodies) 30 via the optical fiber transmission line 20 is performed, by the same system as that carried out between the station side apparatus and the subscriber side apparatus in the PON system. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a packet switching apparatus in which a plurality of input lines and output lines are connected, and a communication packet taken from the input lines is sent to a selected predetermined output line, and a control method therefor.

  A conventional packet switching device uses a data transmission line and a switch card provided on the backplane in the device in order to transfer transmission data received by the input interface card to the output interface card.

  Transmission data including a communication packet received by the input interface card is transmitted to the switch card via a data transmission line (bus) formed on the backplane substrate. The switch card transfers the transmission data toward a desired output interface. Further, not only transmission data but also information for device control is transmitted via a data transmission line (bus) on the backplane substrate.

  In recent years, an optical switch capable of exchanging packet data has been devised, and a technique for transmitting transmission data via a data transmission line composed of an optical fiber has been developed. Along with this, a packet switching apparatus that transmits transmission data using a data transmission line made of an optical fiber and eliminates the need for a backplane substrate has been proposed (for example, Patent Document 1).

  The packet switching device proposed in Patent Document 1 wavelength-multiplexes an intra-device frame signal and a retiming control signal and transmits them using an optical signal. Therefore, the packet switching apparatus can be realized with a configuration that does not require a backplane substrate without increasing the number of electric circuits and optical circuits.

JP 2000-165444 A (Page 7 to Page 11, FIG. 4)

  However, the packet switching apparatus proposed in Patent Document 1 requires an optical switch instead of using a backplane board. This optical switch is expensive and causes an increase in cost. Furthermore, the packet switching apparatus proposed in Patent Document 1 requires a retiming control signal. Therefore, a circuit for generating this retiming control signal is required.

  The present invention has been made in view of the above, and eliminates the need for a backplane substrate and an optical switch, and further eliminates the need to generate a retiming control signal, thereby reducing costs. It is an object of the present invention to obtain a packet switching device and a method for controlling the packet switching device.

  In order to solve the above-described problems and achieve the object, a packet switching apparatus according to the present invention has one or more input lines and one or more output lines connected to each other, and receives a communication packet input from any of the input lines. A packet switching apparatus for outputting to a predetermined output line has a function of either a station side apparatus or a subscriber side apparatus of a PON system, the input lines are connected to each other, and the communication packet is transmitted from the input line. One or more input interface bodies for inputting transmission data including the other functions of the station side apparatus and the subscriber side apparatus of the PON system, and the output lines are connected to each other and transmitted from the input interface body One or more output interface bodies that output transmission data to the output line, the input interface body, and the output An optical fiber transmission line that optically connects the interface body, and transmission performed between the input interface body and the output interface body via the optical fiber transmission line is a PON station side device. And the same method as that performed with the subscriber side device.

  According to the present invention, since it has an optical fiber transmission line that multiplexes and transmits transmission data including communication packets, a backplane board is not required, and an input interface body and an output interface body Since the transmission performed between the PON station side device and the subscriber side device is performed in the same manner as that between the PON station side device and the subscriber side device, data transmission can be performed even in a configuration that does not require an optical switch. Furthermore, there is no need to generate a retiming control signal. Thereby, cost reduction can be aimed at.

  Embodiments of a packet switching apparatus and a packet switching apparatus control method according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
Prior to the description of the present embodiment, a PON (Passive Optical Network) used in a simulated manner by the present embodiment will be described. A PON is a system in which a splitter is inserted in the middle of an optical fiber transmission line extending from a station side device (OLT: Optical Line Terminal), and is branched from a subscriber side device (ONE: Optical Network Unit) to each subscriber's house. That is. In the present embodiment, among the PON technologies, in particular, a technology for multiplexing and transmitting transmission data on one optical fiber transmission line, its transmission method, and one of the functions of the station side device and the subscriber side device. Use the department as a simulation.

  FIG. 1 is a block diagram showing the internal configuration of the packet switching apparatus according to the first embodiment of the present invention. In FIG. 1, a packet switching apparatus 1 includes three input interface cards 10 as input interface bodies having functions of subscriber-side apparatuses of a PON system, and output interface bodies having functions of station-side apparatuses of a PON system. And three output interface cards 30.

  The packet switching apparatus 1 further has an optical fiber transmission line that optically connects the input interface card 10 and the output interface card 30. The optical fiber transmission line is used to collect the optical fiber transmission line 20 for transmitting packet data from the input interface card 10 to the desired output interface card 30 and the optical fiber transmission line 20 addressed to the same output interface card 30. The optical coupler 21 includes an optical fiber transmission path 20 for transmitting information collected by the optical coupler 21 to the output interface card 30.

  Each of the three input interface cards 10 is provided with one input port. Input lines (input 1, input 2, input 3) extending from external devices are connected to the input ports. On the other hand, each of the three output interface cards 30 is provided with one output port. The output ports (output 1, output 2, output 3) connected to the external devices are connected to the output ports.

  The input interface card 10 is connected to an input line, and any one of the reception interface unit 11 as an input unit for inputting transmission data including a communication packet from the input line and the destination information attached to the header portion of the communication packet. It has a sending card discriminating unit 12 as a destination discriminating unit for discriminating whether to output to an output unit, and a card output unit 13 provided corresponding to each output interface card 30. On the other hand, the output interface card 30 has another card input unit 31 to which the optical fiber transmission line 20 is connected and a transmission interface unit 32 as an output unit to which an output line extending from an external device is connected.

  Next, the operation will be described. Transmission data transmitted from the external device is received by the reception interface unit 11 in the input interface card 10. The reception interface unit 11 extracts a communication packet from the transmission data. The extracted communication packet is transferred to the sending card determination unit 12. The sending card discriminating unit 12 obtains destination information attached to the communication packet as header information, for example. Then, the output interface card 30 to be output is determined based on the destination information and transferred to the card output unit 13 addressed to the corresponding output interface card 30. Even in a configuration that does not require an optical switch, data transmission can be performed, and there is no need to generate a retiming control signal. Note that the input interface card 10 and the output interface card 30 may have the functions of either a PON station side device or a subscriber side device, and the direction of communication is not limited to this.

  In the present embodiment, as described above, the PON technique (a technique of inserting a branching device in the middle of an optical fiber network and drawing a single fiber into a plurality of subscriber homes) is used in a simulated manner. . The packet transfer method between the card output unit 13 and the other card input unit 31 of the output interface card 30 uses the transfer method of the upstream packet from the PON subscriber side device to the station side device. That is, the card output unit 13 outputs transmission data according to the transmission data transmission timing notified from the other card input unit 31 of the output interface card 30. The other card input unit 31 transfers the received transmission data to the transmission interface unit 32, and the transmission interface unit 32 outputs the transmission data to an external device.

  In the present embodiment, regarding the retiming of communication packets, packet delimiter data is extracted from a bit string on an encoded transmission line based on a bit string extracted by a clock recovered by clock recovery, and the packet is reproduced. . Then, ATM cells, Ethernet (registered trademark) frames, and the like are used as techniques for performing frame separation for encoding and packet recognition.

  As described above, the packet switching apparatus 1 according to the present embodiment has a function of any one of the station side apparatus and the subscriber side apparatus of the PON system, the input lines are connected to each other, and the communication packet is transmitted from the input line. The input interface card 10 for inputting the transmission data including the other function of the station side device and the subscriber side device of the PON system, the output lines are connected to each other, and the transmission data transmitted from the input interface card 10 is output. An output interface card 30 that outputs to the line, and an optical fiber transmission path 20 that optically connects the input interface card 10 and the output interface card 30, and outputs to the input interface card 10 via the optical fiber transmission path 20. Transmission to / from the interface card 30 is PON It carried out in the same manner as method performed between the line terminal and the subscriber unit. Therefore, data transmission can be performed even in a configuration that does not require a backplane substrate. Then, the reception interface unit 11 and the transmission interface unit 32 are optically connected, and the optical fiber transmission line 20 and the optical coupler 21 as optical fiber transmission lines for multiplexing and transmitting the transmission data including the communication packet, and the communication packet Since the sending card discriminating unit 12 as the destination discriminating unit for discriminating which transmission interface unit 32 outputs based on the destination information attached to the card, no optical switch is required, thereby reducing the cost. Can do.

  In addition, since transmission of communication packets from the reception interface unit 11 to the transmission interface unit 32 is performed by the uplink packet transfer method from the PON subscriber side device to the station side device, it is necessary to generate a retiming control signal. No further cost reduction can be achieved.

  In the present embodiment, the input interface card 10 and the output interface card 30 are different cards, but they may be configured as the same substrate. Furthermore, in the present embodiment, the PON technique is simulated as described above. There are various types of PON such as GE-PON (gigabit Ethernet (registered trademark) -PON) "and" B-PON (broadband-PON) ". In this embodiment, a specific PON is used. It is not limited, and any PON system may be used.

  Further, in the present embodiment, the three input interface cards 10 and the three output interface cards 30 are provided. be able to.

Embodiment 2. FIG.
In the first embodiment described above, PON is used for connection between the plurality of input interface cards 10 and the output interface card 30, and packet transfer is performed using an optical fiber transmission line. In this embodiment, in addition to the configuration of the packet switching apparatus 1 having the configuration of the first embodiment, a control card for performing control and setting is added, and PON is also used for connection between the control card and the interface card. Thus, an optical fiber transmission line is used.

  FIG. 2 is a block diagram showing an internal configuration of the packet switching apparatus according to the second embodiment of the present invention. 2, in the packet switching apparatus 2 of the present embodiment, a control card 40 as a control body is added to the packet switching apparatus 1 of the first embodiment (FIG. 1), and an optical fiber transmission line 20 and an optical coupler 21 are further added. As in the connection between the input interface card 10 and the output interface card 30, the control card 40 and the input interface card 10 are connected.

  In addition to transmitting / receiving control data and setting parameters to / from the input interface card 10, the control card 40 can be connected to an input interface control card 50 having the same input interface structure as the input interface card 10. In this case, the control card 40 has a transmission interface unit 32 similar to the output interface card 30 and functions as an input / output interface configuration capable of transmitting and receiving control data and setting parameters within the apparatus.

  Next, the operation will be described. The operation in which the output interface card 30 outputs the packet received by the input interface card 10 is the same as in the first embodiment. The operation of outputting the packet received by the input interface control card 50 by the output interface card 30 is the same as that of the first embodiment.

  Next, internal transfer of internal information such as setting parameters will be described. The device setting / monitoring control unit 42 disposed on the control card 40 transmits the operation parameters of the control card 40 and the input interface control card 50 and the operation parameters of the interface card 10 to the interface card 10. The interface card 10 also receives current setting information, statistical information, and operation status.

  When setting parameters and control data of the interface card 10 are generated in the device setting / monitoring control unit 42 of the control card 40, both the destination interface card numbers are transferred to the interface card input / output control unit 41. The transferred parameters are broadcast on the optical fiber transmission line by the interface card input / output control unit 41 using the downlink packet transfer means from the PON station side device to the subscriber device.

  The control card input / output control unit 14 of the input interface card 10 extracts only the data addressed to its own input interface card from the broadcasted setting / control data and transfers it to the setting information storage unit 15. The setting information storage unit 15 stores the transferred data.

  Next, an operation for transmitting information from the setting information storage unit 15 to the apparatus setting / monitoring control unit 42 will be described. The setting information storage unit 15 extracts necessary information and transfers it to the control card input / output control unit 14. The control card input / output control unit 14 uses the upstream packet transfer method from the PON subscriber side device to the station side device in the same manner as the normal received packet transfer method. 41. When the control card input / output control unit 14 simultaneously transfers transmission data received from an external device and information from the setting information storage unit 15, information to be transferred is selected according to a preset priority order. The information that has not been selected is stored in a memory on the input interface card or the like, and waits for the transfer of the information being transferred to end. The interface card input / output control unit 41 that has received control data from the control card input / output control unit 14 transfers it to the device setting / monitoring control unit 42.

  As described above, in the packet switching apparatus 2 according to the present embodiment, since control information and setting information in the apparatus are also transferred through the optical fiber transmission line using the PON, the backplane card as conventionally performed is used. It is not necessary to transfer control information and setting information using, and it is possible to configure a packet switching apparatus that does not require a backplane card.

  FIG. 3 shows a modification of the packet switching apparatus according to the second embodiment of the present invention. In the packet switching apparatus shown in FIG. 3, the interface card 120 has the configuration of the input interface card 10 and the output interface card 30 of the packet switching apparatus shown in FIG. Further, the input / output / control card 130 has the configuration of the control card 40 and the input interface control card 50 of the packet switching apparatus shown in FIG. That is, the input interface card 10 and the output interface card 30 are a single card. The control card 40 and the input interface control card 50 are a single card. In addition, the reception interface unit 11 and the transmission interface unit 32 of each card are arranged along one side of the apparatus so as to be easily connected to the input line and the output line. An actual packet switching apparatus is often formed in such a shape.

Embodiment 3 FIG.
In the above-described first and second embodiments, the input interface card 10 is provided with the outgoing card discriminating unit 12 for selecting the output interface card 30 that is the destination of the received packet, and each interface card is connected to another interface card. It has a transfer function on the subscriber side of the PON for transferring the packet and a reception function of the station side apparatus for receiving the packet from another interface card.

  In the packet switching device 3 according to the present embodiment, the output destination of the communication packet is determined not on the interface card 10 but on the switch card 70 having the reception function of the PON station side device. As a result, the function of the interface card is simplified, and the apparatus configuration is such that it can have only functions substantially equivalent to those of the PON subscriber-side apparatus.

  FIG. 4 is a block diagram showing an internal configuration of the packet switching apparatus according to the third embodiment of the present invention. In FIG. 4, the packet switching apparatus 3 according to the present embodiment includes an input / output interface card 60 that is a plurality of input / output interface bodies and a switch card 70 that is one or a plurality of switch bodies. The input / output interface card 60 includes a packet input / output unit 61, a transmission control unit 62, an output determination unit 63, and a transmission / reception demultiplexing unit 64 that are output units as well as an input unit. The switch card 70 includes a transmission / reception demultiplexing unit 71, a packet destination determination unit 72 as a destination determination unit, and a packet input control unit 73.

  The packet switching device 3 further has an optical fiber transmission path for optically connecting the input / output interface card 60 and the switch card 70. The optical fiber transmission line is connected to each of the input / output interface cards 60 to transmit data, the optical coupler 21 for collecting the optical fiber transmission lines 20 from the input / output interface card 60, and the optical coupler. 21 and a switch card 70 are connected to each other to form an optical fiber transmission line 20 for data transmission.

  Next, the operation will be described. Transmission data including a communication packet transferred from an external device is received by the packet input / output unit 61 of the input / output interface card 60 and taken out as transmission data. The transmission data is transferred to the transmission control unit 62, and the transmission control unit 62 transmits and receives transmission data at a transmission timing according to the transfer method from the PON subscriber side device to the station side device in cooperation with the packet input control unit 73. Transfer to the demultiplexing unit 64. The transmission / reception demultiplexing unit 64 converts the transmission data into an optical output and transmits it to the optical fiber transmission line 20. The transmission data output from each input / output interface card 60 in this way is combined by the optical coupler 21 and transmitted to the switch card 70 via the optical fiber transmission line 20.

  The transmission / reception demultiplexing unit 71 of the switch card 70 extracts the transmission data and transfers it to the packet destination determination unit 72. The packet destination determination unit 72 detects timing information of the input transmission data, recognizes a communication packet based on the timing information, and obtains destination information attached to the communication packet as header information, for example. The transmission data for which the destination is determined is transferred to the transmission / reception demultiplexing unit 71 with the information of the output interface card 60 as the destination information added thereto according to the transfer method from the PON station side device to the subscriber side device.

  The transmission / reception demultiplexing unit 71 outputs the transferred transmission data to the optical fiber transmission line 20. The transmission data output from the switch card 70 is demultiplexed by the optical coupler 21 and broadcast to all interface cards via the optical fiber transmission line 20. The transmission / reception demultiplexing unit 64 of the input / output interface card 60 that has received the packet from the optical fiber transmission line 20 extracts the transmission data and transfers it to the output determination unit 63. The output judging unit 63 discriminates transmission data addressed to itself according to the PON procedure and transfers it to the packet input / output unit 61. The packet input / output unit 61 that has received the transmission data transfers the transmission data to an external device.

  As described above, it has the function of the subscriber side device of the PON system, and the input line and the output line are connected to each other. The transmission data including the communication packet is input from the input line and the transmission data is output to the output line. A plurality of input / output interface cards (input / output interface bodies) 60 are provided connected to the input / output interface card 60 by optical fiber transmission lines (optical fiber transmission lines 20 and optical couplers 21), and A switch card (switch) having a packet destination discrimination unit 72 (destination discrimination means) that has a function, inputs transmission data, and discriminates to which input / output interface card 60 to output based on destination information attached to a communication packet Body) 70.

  As described above, the switch card 70 having the reception function of the PON station side device determines the destination of the communication packet, so that the number of cards in the device increases, but the destination determination means in the packet transfer operation is combined into one. Therefore, the configuration of the packet switching device can be simplified.

  Transmission of the communication packet from the switch card 70 to the input / output interface card 60 is performed by a forward communication packet transfer method from the PON station side device to the subscriber side device, and destination information is added to the transmission data. It is broadcast on the optical fiber transmission line (optical fiber transmission line 20, optical coupler 21). Thus, since the transmission data is broadcast to all the input / output interface cards 60, multicasting and broadcasting can be easily realized without preparing a special buffer. Furthermore, since the switch card 70 is a process that only determines and transfers the input / output interface card 60 for the input transmission data, a buffer memory can be dispensed with on the switch card 70 and can be further simplified.

Embodiment 4 FIG.
In the above-described third embodiment, the switch switching unit 70 is provided in the packet switching device 3 to simplify the configuration of the device by combining the packet destination determination means. However, the packet switching device of the present embodiment is In addition to the configuration of the third embodiment, functions for performing setting and monitoring control in the apparatus are added.

  FIG. 5 is a block diagram showing the internal configuration of the packet switching apparatus according to the fourth embodiment of the present invention. In FIG. 5, transmission data received from an external device is taken out by the packet input / output unit 81 of the input / output interface card 80. The packet input / output unit 81 transfers the extracted transmission data to the transmission control unit 82.

  The transmission control unit 82 transfers the transmission data to the transmission / reception demultiplexing unit 84 at a transmission timing according to the transfer method from the PON subscriber side device to the station side device in cooperation with the packet input control unit 93. At that time, the presence or absence of information addressed to the device setting / monitoring control unit 94 of the switch card 90 from the setting information storage unit 85 is confirmed. Transfer information from. The information that has not been selected is stored in a memory on the input interface card or the like, and waits for the transfer of the information being transferred to end. The transmission / reception demultiplexing unit 84 outputs the received data to the optical fiber transmission line 20 as transmission data.

  The optical coupler 21 combines signals from the optical fiber transmission line 20 and outputs them to the optical fiber transmission line 20 connected to the switch card 90. The transmission / reception demultiplexing unit 91 of the switch card 90 extracts data from the received signal and transfers it to the output determination unit 95. The output determination unit 95 determines whether the received data is transmission data from the external device or information in the own device. If the received data is transmission data from the external device, the data is transferred to the packet destination determination unit 92. For example, the data is transferred to the apparatus setting / monitoring control unit 94. The packet destination discrimination unit 92 determines the input / output interface card 80 to be output from the header information of the received transmission data. The transmission data for which the destination is determined is transferred to the transmission / reception demultiplexing unit 91 with the input / output interface card 80 information as the destination information added according to the transfer method from the PON station side device to the subscriber side device. At this time, the presence / absence of control information from the apparatus setting / monitoring control unit 94 is confirmed, and if it exists, it is transferred to the transmission / reception demultiplexing unit 91 according to a preset priority. Information that has not been selected is stored in a memory or the like on the switch card 90 and waits for the end of transfer of the information being transferred. The transmission / reception demultiplexing unit 91 outputs the received data to the optical fiber transmission line 20 as transmission data.

  The optical coupler 21 demultiplexes the signal from the optical fiber transmission line 20 connected to the switch card 90 and broadcasts it to the optical fiber transmission lines 20 of all the connected input / output interface cards 80. The transmission / reception demultiplexing unit 84 of the interface card 80 that has received the signal from the optical fiber transmission line 20 extracts the received data and transfers it to the output determination unit 83. The output determination unit 83 determines whether the received data is transmission data addressed to the external device or information in the own device. If the data is transmission data addressed to the external device, the data is transferred to the packet input / output unit. Transfer to the information storage unit 85. The packet input / output unit 81 outputs the transmission data received from the output determination unit 83 to the external device.

  Next, in-device transfer of internal information such as setting parameters according to the present embodiment will be described. The device setting / monitoring control unit 94 arranged in the switch card 90 sets the operation parameters of the switch card 90 itself, transmits the operation parameters of the input / output interface card 80 to the input / output interface card 80, and Receives setting information, statistical information, and operating status.

  The device setting / monitoring control unit 94 that has generated the operation parameter setting of the input / output interface card 80 transfers the operation parameter to the transmission control unit 96. The transmission control unit 96 checks the presence / absence of transmission transmission data from the packet destination determination unit 92, and if it exists, transfers it to the transmission / reception demultiplexing unit 91 according to a preset priority. If it does not exist, it is immediately transferred to the transmission / reception demultiplexing unit 91. The transmission / reception demultiplexing unit 91 outputs the received operation parameter to the optical fiber transmission line 20 as transmission data. The signal sent out to the optical fiber transmission line 20 is demultiplexed by the optical coupler 21 and broadcast to each input / output interface card 80 through the optical fiber transmission line 20. The input / output interface card 80 separates the received data by the transmission / reception demultiplexing unit 84 and transfers it to the output determination unit 83. If the output determination unit 83 is addressed to the own input / output interface card 80 and is a setting parameter, it is transferred to the setting information storage unit 85. The setting information storage unit 85 stores the received setting parameters.

  The device setting / monitoring control unit 94 that needs to acquire the current setting information, statistical information, and operation state of the input / output interface card 80 sends a command to request information acquisition to the input / output interface card 80 that wants to acquire information. Transmit to the setting information storage unit 85. The procedure until the command output from the device setting / monitoring control unit 94 reaches the setting information storage unit 85 is the same as the transfer of setting parameters described above in the device.

  Next, an operation for transmitting information from the setting information storage unit 85 to the apparatus setting / monitoring control unit 94 will be described. The setting information storage unit 85 takes out necessary information and transfers it to the transmission control unit 82. The transmission control unit 82 transfers the data to the transmission / reception demultiplexing unit 84 in the same procedure as the reception transmission data transfer. The transmission / reception demultiplexing unit 84 outputs the received information to the optical fiber transmission line 20.

  The optical coupler 21 combines signals from the optical fiber transmission line 20 and outputs them to the optical fiber transmission line 20 connected to the switch card 90. The transmission / reception demultiplexing unit 91 of the switch card 90 that has received the signal from the optical fiber transmission line 20 extracts the received data and transfers it to the output determination unit 95. The output determination unit 95 determines whether the received data is transmission data received from an external device or information in the own device. If the data is transmission data, the data is transferred to the packet destination determination unit 92. Transfer to the monitoring controller 94. In this way, the information of the input / output interface card 80 is transferred to the device setting / monitoring control unit 94.

  As described above, in the packet switching apparatus 4 of the present embodiment, the input / output interface card 80 has the setting information storage unit 85 that stores its own setting information, and the switch card 90 stores the input / output interface card 80. A device setting / monitoring control unit 94 that monitors and sets the setting information in the setting information storage unit 85 as necessary. The device setting / monitoring control unit 94 stores setting information via the optical fiber transmission line 20. Setting information is sent to the unit 85.

  Further, transmission of packet data and setting information from the switch card 90 to the input / output interface card 80 is performed through the same transmission path, and the transmission destination input / output interface card 80 is confirmed and acquired. .

  In this way, the switch card 90 is provided with the device setting / monitoring control unit 94 to perform setting and management operations of the switch card itself and the input / output interface card 80, and further transfer device internal information for that purpose. Since the same transfer path is used, the packet switching apparatus can be configured with a simple configuration.

Embodiment 5. FIG.
In the above-described fourth embodiment, setting information and management information in the apparatus are transferred using a route similar to the transmission data transfer route. Next, the setting information and statistical information in the apparatus shows a mode of being transferred from the switch card to the interface card via an optical fiber transmission line different from the transmission data transfer path.

  FIG. 6 is a block diagram showing an internal configuration of the packet switching apparatus according to the fifth embodiment of the present invention. In FIG. 6, a packet switching apparatus 5 is used for transferring one or more switch cards 110 and a plurality of input / output interface cards 100 for transmission data transfer optical fiber transmission line 20 and setting information in the apparatus. The optical fiber transmission line 20 is connected by two data transfer lines.

  The transmission / reception demultiplexing unit 71, the packet destination determination unit 72, and the packet input control unit 73 on the switch card 110 are the same as those in the third embodiment. The packet input / output unit 81, transmission control unit 82, output determination unit 83, and transmission / reception demultiplexing unit 84 on the input / output interface card 100 are the same as those in the third embodiment. Next, transmission data transfer will be described. A device internal transfer system for transmission data to be transmitted / received to / from an external device is the same as that of the third embodiment.

  Next, in-device transfer of internal information such as setting parameters of the packet switching device 5 having such a configuration will be described. The device setting / monitoring control unit 114 arranged in the switch card 110 that is a switch body sets the operation parameters of the switch card 110 itself, and the operation parameters of the input / output interface card 100 that is the input / output interface card body. The current setting information, statistical information, and operation status of the input / output interface card 100 are received. The device setting / monitoring control unit 114 has a function of performing input control from the transmission control unit 82, which is equivalent to the input control unit 73.

  The device setting / monitoring control unit 114 in which the operation parameter setting of the input / output interface card 100 has occurred assigns the setting parameter to the information of the input / output interface card 100 according to the transfer method from the PON station side device to the subscriber side device. To the transmission / reception demultiplexing unit 111. The transmission / reception demultiplexing unit 111 outputs the received setting parameter to the optical fiber transmission line 20 as transmission data. The signal sent to the optical fiber transmission line 20 is demultiplexed by the optical coupler 21, and broadcast to each input / output interface card 100 through the optical fiber transmission line 20. The input / output interface card 100 separates the received data by the transmission / reception demultiplexing unit 84 and transfers it to the output determination unit 83. The output determination unit 83 transfers the received operation parameter to the setting information storage unit 85 if the received operation parameter is for the own card. The setting information storage unit 85 stores the received setting parameters.

  Next, an operation for transmitting information from the setting information storage unit 85 to the apparatus setting / monitoring control unit 114 will be described. The setting information storage unit 85 takes out necessary information and transfers it to the transmission control unit 82. The transmission control unit 82 transfers the data to the transmission / reception demultiplexing unit 84 in cooperation with the device setting / monitoring control unit 114 in the same procedure as the received transmission data transfer. The transmission / reception demultiplexing unit 84 outputs the received information to the optical fiber transmission line 20. The optical coupler 21 combines signals from the optical fiber transmission line 20 and outputs them to the optical fiber transmission line 20 connected to the switch card 90.

  The transmission / reception demultiplexing unit 111 of the switch card 110 that has received the signal from the optical fiber transmission line 20 extracts the received data and transfers it to the device setting / monitoring control unit 94. In this way, the information of the input / output interface card 80 is transferred to the apparatus setting / monitoring control unit 94.

  As described above, in the packet switching apparatus 5 according to the present embodiment, the data transmission path from the switch card 110 to the input / output interface card 100 includes two paths: a packet data transmission path, a setting information transmission path, and two systems. Has been. In other words, separate optical fiber transmission paths are used for the transfer path of transmission data from the external device and the transfer path of the device internal information inside the device, and the processing unit corresponding to each transfer is provided for both the switch card and the interface card. By having them separately, it is possible to simplify the processing contents of the processing unit on each card and to secure the transmission band of the optical fiber transmission line.

  As described above, the packet switching apparatus and the packet switching apparatus control method according to the present invention are useful for a packet switching apparatus that switches transmission data including communication packets transmitted from a plurality of apparatuses to a predetermined apparatus. In particular, it is suitable for reducing the cost of the packet switching apparatus.

It is a block diagram which shows the internal structure of the packet switching apparatus of Embodiment 1 of this invention. It is a block diagram which shows the internal structure of the packet switching apparatus of Embodiment 2 of this invention. It is a block diagram which shows the modification of the packet switching apparatus of Embodiment 2 of this invention. It is a block diagram which shows the internal structure of the packet switching apparatus of Embodiment 3 of this invention. It is a block diagram which shows the internal structure of the packet switching apparatus of Embodiment 4 of this invention. It is a block diagram which shows the internal structure of the packet switching apparatus of Embodiment 5 of this invention.

Explanation of symbols

1, 2, 3, 4, 5 Packet switching device 10 Input interface card (input interface body)
11 Reception interface part (input part)
12 Sending card discriminating section (destination discriminating means)
13 Card output unit 14 Control card input / output control unit 15 Setting information storage unit 20 Optical fiber transmission line 21 Optical coupler 30 Output interface card (output interface body)
31 Other card input unit 32 Transmission interface unit (output unit)
40 Control card (control body)
41 Interface Card Input / Output Control Unit 42,114 Device Setting / Monitoring Control Unit 50 Input Interface Control Card 60, 80, 110 Input / Output Interface Card (Input / Output Interface Body)
61, 81 Packet input / output unit (output unit)
62, 82 Transmission control unit 63, 83 Output determination unit 64, 84, 111 Transmission / reception demultiplexing unit 70, 90, 100 Switch card (switch body)
71,91 Transmission / reception demultiplexing unit 72,92 Packet destination discriminating unit (destination discriminating means)
73, 93 Packet input control unit 85 Setting information storage unit 94 Device setting / monitoring control unit 95 Output determination unit 96 Transmission control unit 120 Interface card 130 Input / output / control card

Claims (15)

In the packet switching apparatus in which one or more input lines and one or more output lines are connected, and a communication packet input from any of the input lines is output to the predetermined output line,
One or more input interface bodies each having a function of either a station-side device or a subscriber-side device of the PON system, wherein the input lines are connected to each other, and transmission data including the communication packet is input from the input lines; ,
One or more output interfaces having the other function of the station side device and the subscriber side device of the PON system, wherein the output lines are connected to each other, and the transmission data transmitted from the input interface body is output to the output line. Body,
An optical fiber transmission line that optically connects the input interface body and the output interface body;
Transmission performed between the input interface body and the output interface body via the optical fiber transmission line is performed in the same manner as that performed between the PON station side device and the subscriber side device. A packet switching device. The said input interface body has the said destination discrimination | determination means which discriminate | determines to which said output interface body the said transmission data are output based on the destination information incidental to the said communication packet. Packet switching equipment. Transmission of communication packets from the side having the function of the subscriber side device of the input interface body and the output interface body to the side having the function of the station side device of the input interface body and the output interface body is performed by a PON subscriber. Is performed by the upstream packet transfer method from the side device to the station side device,
Transmission of communication packets from the side having the function of the station side device of the input interface body and the output interface body to the side having the function of the subscriber side device of the input interface body and the output interface body is performed by the PON station side. This is performed by a downlink packet transfer method from the device to the subscriber side device, destination information is added to the transmission data and broadcast on the optical fiber transmission line, and the destination interface body confirms the destination information. The packet switching device according to claim 1, wherein the packet switching device acquires this. Transmission of communication packets from the side having the function of the subscriber side device of the input interface body and the output interface body to the side having the function of the station side device of the input interface body and the output interface body is time division multiple access. Done in a manner,
Transmission of communication packets from the side of the input interface body and the output interface body having a function of a station side device to the side of the input interface body and the output interface body having a function of a subscriber side device is performed by time division multiplexing. The packet switching device according to claim 3, wherein A setting information storage unit provided in the input interface body for storing setting information of the input interface body;
A controller that monitors the input interface body and sets the setting information in the setting information storage unit as necessary;
The packet switching device according to any one of claims 1 to 4, wherein the control body sends the setting information to the setting information storage unit via the optical fiber transmission line. Transmission of the setting information from the control body to the input interface body is performed by a downlink communication packet transfer method from the PON station side apparatus to the subscriber side apparatus, and destination information is added to the transmission data to add the destination information. 6. The packet switching apparatus according to claim 5, wherein the packet transmission apparatus is broadcasted on an optical fiber transmission path, and the input interface body of the transmission destination confirms the destination information and acquires it. In the packet switching apparatus in which one or more input lines and one or more output lines are connected, and a communication packet input from any of the input lines is output to the predetermined output line,
It has the function of a subscriber side device of the PON system, the input line and the output line are connected to each other, and the transmission data including the communication packet is input from the input line and the transmission data is output to the output line A plurality of input / output interface bodies,
The input / output interface body is connected to the optical fiber transmission line and has a function of a station side device of the PON system. The transmission data is input, and any one of the transmission data is attached to the communication packet based on destination information. A switch body having a destination determination means for determining whether to output to the input / output interface body,
Transmission performed between the input / output interface body and the switch body via the optical fiber transmission line is performed in the same manner as that performed between the PON station side device and the subscriber side device. A packet switching device. The destination discrimination means detects timing information of the transmission data flowing through an optical fiber transmission line, recognizes the communication packet based on the timing information, and obtains the destination information attached to the communication packet. Item 8. The packet switching device according to Item 7. Transmission of the communication packet from the input / output interface body to the switch body is performed by an upstream packet transfer method from the PON subscriber side device to the station side device, and the switch body to the input / output interface body. Transmission of the communication packet is performed by a downlink packet transfer method from the PON station side device to the subscriber side device, destination information is added to the transmission data and broadcast on the optical fiber transmission line, and the transmission destination The packet switching apparatus according to claim 8, wherein the input / output interface body confirms and acquires the destination information. The transmission of communication packets from the input / output interface body to the switch body is performed by a time division multiple access method, and the transmission of communication packets from the switch body to the input / output interface body is performed by a time division multiplexing method. The packet switching device according to claim 9, wherein The input / output interface body includes a setting information storage unit that stores setting information of the input / output interface body,
The switch body includes an apparatus setting / monitoring control unit that monitors the input / output interface body and sets the setting information in the setting information storage unit as necessary.
11. The packet switching device according to claim 7, wherein the device setting / monitoring control unit sends the setting information to the setting information storage unit via the optical fiber transmission line. Transmission of packet data and setting information from the switch body to the input / output interface body is performed through the same transmission path, and the transmission destination input / output interface body is checked to obtain one. The packet switching device according to claim 11. The packet switching path according to claim 11, wherein the data transmission path from the switch body to the input / output interface body is divided into two systems: a packet data transmission path and a setting information transmission path. apparatus. One or more input lines and one or more output lines are connected, and a method for controlling a packet switching apparatus that outputs a communication packet input from an arbitrary input line to a predetermined output line,
One or more input interface bodies to which one or more of the input lines are connected respectively and one or more output interface bodies to which one or more of the output lines are connected to have the functions of a station side device and a subscriber side device of the PON system. ,
A method for controlling a packet switching apparatus, wherein transmission is performed between the input interface body and the output interface body via an optical fiber transmission line. 15. The transmission performed between the input interface body and the output interface body is performed in the same manner as that performed between the PON station side device and the subscriber side device. A method for controlling a packet switching apparatus.

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