JP4455317B2 - Packet communication device - Google Patents

Description

  The present invention relates to a packet communication apparatus, and more particularly to a packet communication apparatus that multiplexes uplink data from a plurality of LAN lines onto an upper line or separates downlink data from an upper line into LAN lines.

  The packet communication device primarily multiplexes uplink data from a plurality of LAN lines with a line package and transfers them to the control package. In the control package, the primary multiplexed data from each line package is further subjected to secondary multiplex to the upper line. It has been conventionally known that downlink data from an upper line is transmitted to each LAN line by performing the reverse process.

  On the other hand, in the packet switching apparatus of Ni input ports, No output ports, in the packet switch unit, a redundant output port unit that multiplexes packets having any output port as routing information and further forwards to any output port, By having a selector in each output port and selecting either output port or redundant output port, even if a failure or congestion is detected in any output port, the buffer in the redundant output port will fail. Alternatively, there is a packet switching device that realizes N + M duplication on the switch surface of the packet switching device and avoids packet discard due to congestion by transferring traffic destined for the output port detected by the control unit (for example, , See Patent Document 1).

  Further, the device extracts the SDH transmission frame from the input data, outputs the fixed-length cell data, the connection identifier, and the routing tag, and separates the routing tag from the cell stream and converts it into the channel identifier, A line interface unit comprising an output port drive unit for transmission to a node, a switch output multiplexing unit for preferentially reading out and outputting a memory cell corresponding to an input port drive unit having a high occurrence frequency, and a system clock distribution unit for distributing a clock signal , An initialization control unit that controls system initialization, a switch maintenance control unit that performs switch maintenance control in accordance with a network management cell, and a switch call that outputs connection information by message analysis of a preprocessing cell when an input cell is a signal cell Processing control unit and switch to switch to normal board in case of failure With full interconnected asynchronous transfer mode switching device having a switch module control unit (for example, see Patent Document 2.).

JP 2000-49860 A JP-A-9-181742

  When a failure occurs in the multiplexed line package in this way and the data is in a disconnected state, all the LAN lines accommodated in the line package become unusable, so that the LAN line needs to be repaired instantly. Become.

  As a relief method, conventionally, a protection circuit package is provided in addition to the working circuit package, and a switching circuit (for example, a relay) that switches between both circuit packages is required.

  In addition, the line package accommodates a plurality of LAN lines with priority classes and multiplexes the data of each LAN line. When data congestion occurs, the data of the low priority LAN line is sacrificed and discarded. It was supposed to be.

  As a method for suppressing the data discard, conventionally, a large-capacity buffer is prepared or a line package with a small number of accommodation ports is used.

  Therefore, the present invention can instantaneously relieve a LAN line without using a protection line package or a switching circuit to relieve a LAN line related to a failure, and further includes a large-capacity buffer or accommodates a line package. It is an object of the present invention to provide a packet communication apparatus that can suppress data discard during data congestion without reducing the number of ports.

  In order to solve the above-described problem, a packet communication device according to the present invention (1) includes two line packages each of which accommodates a plurality of uplink LAN lines and that multiplexes and outputs the data of the uplink LAN lines. And a control package having a multiplexing / demultiplexing unit that further multiplexes the primary multiplexed data of each line package and transmits it to the upstream upstream line, and each line package includes the input port of the upstream LAN line and the primary An L2 switch having a bypass port in addition to an output port of multiplexed data, and a setting unit for controlling switching of each port interconnection of the L2 switch, wherein each bypass port is connected to each other, and the control package However, when two failure detection units that detect the disconnection state of each primary multiplexed data, and one failure detection unit detects the disconnection state of the primary multiplexed data, Change the setting of the setting section of the corresponding line package to switch the connection of the input port from the output port to the bypass port, and output the data from the bypass port of the line package corresponding to the fault And a communication unit for making a detour to a detour port of a circuit package without a line.

Here, the principle (upward data relief) of the present invention (1) will be described below with reference to FIG.

  First, regarding the configuration, a plurality of uplink LAN lines 1u_1, 1u_2 (hereinafter may be collectively referred to as “1u”) may be collectively referred to as line packages 2_1, 2_2 (hereinafter, referred to as “2”). )) L2 switches 10u_1, 10u_2 (hereinafter, collectively referred to as “10u”), are connected to input ports 7u_1, 7u_2 (hereinafter, sometimes collectively referred to as “7u”). The output ports 8u_1 and 8u_2 (hereinafter may be collectively referred to as “8u”) of each L2 switch 10u are output data (primary multiplexed data) 3_1 and 3_2, respectively, back wiring board (BWB) 20, etc. It is sent to the control package 6 via the transmission line. In the control package 6, the primary multiplexed data 3_1 and 3_2 are sent to the multiplexing / demultiplexing unit 5 and the failure detection units 12_1 and 12_2 (hereinafter, may be collectively referred to as “12”).

  The output terminal of the multiplexer / demultiplexer 5 is connected to the upstream upstream line 4u. The output terminals of the two failure detection units 12 are respectively connected to the input terminals of the communication unit 13, and the two output terminals of the communication unit 13 are the setting units 11_1 and 11_2 (hereinafter, “11”) of each line package 2. And the output terminal of each setting unit 11 is connected to each L2 switch 10u.

  The L2 switches 10u_1 and 10u_2 are provided with detour ports 9_1 and 9_2 (hereinafter may be collectively referred to as “9”), and the detour ports 9_1 and 9_2 are connected to each other.

  In the above configuration, in a normal state, each setting unit 11 that controls the interconnection between the ports of the L2 switch 10u outputs each LAN port data of each input port 7u to each output port 8u. Is set. Accordingly, the L2 switch 10u performs primary multiplexing on the data of each uplink LAN line 1u received at the input port 7u based on the setting information of the setting unit 11, and outputs the result from the output port 8u. The primary multiplexed data 3_1 and 3_2 are transferred to the multiplexing / separating unit 5 of the control package 6 through a transmission path constituted by, for example, a back wiring board (BWB) 20, and further secondary-multiplexed and transmitted. It is output to the upper line 4u.

  Here, when the primary multiplexed data 3_1 of the line package 2_1 is in a disconnected state due to some failure (indicated by x in the figure), the failure detecting unit 12_1 of the control package 6 detects the disconnected state and sends it to the communication unit 13. The communication unit 13 changes the setting information to the setting unit 11_1 of the line package 2_1. As a result, the L2 switch 10u_1 switches the data received at the input port 7u_1 to be output from the output port 8u_1 to the detour port 9_1 in accordance with the setting change of the setting unit 11_1. Therefore, the data on the uplink LAN line 1u_1 A detour is made to the detour port 9_2 of the line package 2_2 via 18u.

  The data detoured from the detour port 9_1 to the detour port 9_2 is primarily multiplexed together with the data of the uplink LAN line 1u_2 to the input port 7u_2 of the L2 switch 10u_2 and multiplexed from the output port 8u_2 to the control package 6 Is transferred to the demultiplexing unit 5, and the multiplexing / demultiplexing unit 5 further performs secondary multiplexing and transmits the result to the upstream upstream line 4 u.

  Accordingly, when the primary multiplexed data 3_1 of the line package 2_1 is in a disconnected state, the line package 2_2 becomes a relief package through the bypass port 9, so that the uplink LAN line 1u_1 is not used without using the backup line package. Data can be rescued.

  Even if the primary multiplexed data 3_2 of the line package 2_2 is in a disconnected state, the line package 2_1 becomes a relief package in the same manner. In this case, the data of the upstream LAN line 1u_2 is not used without using the spare line package. Can be rescued.

  Further, as described above, the bypass ports 9 connected to each other function in both directions, so that each line package 2 connected by the bypass port 9 is fixed 1 like a conventional spare line package. Rather than relieving only one line package, mutual redress is possible.

  Further, the L2 switch 10u of each line package 2 is configured to change the uplink data input from the bypass port 9 based on the setting of the setting unit 11 together with the uplink data to the input port 7u of the uplink LAN line 1u. The primary multiplexing can be performed and output to the control package 6.

  In order to solve the above-described problem, the packet communication apparatus according to the present invention (2) uses two forwarding tables in which the downlink upper line data is designated in advance by storing destinations at normal time and failure time. Each line package comprising: a control package having a multiplexing / separating unit for primary separation in a route; and two line packages for further separating the primary separated data into secondary separated data and transmitting them to a plurality of downlink LAN lines. A failure detection unit for detecting a disconnection state of the primary separation data, an L2 switch having a bypass port in addition to an input port of the primary separation data and an output port of the downlink LAN line, and each port of the L2 switch And a setting unit that controls the switching of the interconnection, each detour port is connected to each other, and one failure detection unit has detected a disconnection state of the primary separation data Changing the setting of the corresponding setting unit to switch the connection of the output port from the input port to the bypass port, and when the setting unit changes the setting, the control package changes the forwarding table to the time of the failure. A communication unit that switches the primary separated data to the non-failed line package and switches the L2 switch of the non-failed line package based on the setting of the setting unit. The primary separation data is output from the detour port and detoured to the detour port of the line package corresponding to the failure.

Here, the principle (relief of downlink data) of the present invention (2) will be described below with reference to FIG.

  First, regarding the configuration, the data from the downlink higher line 4d is received by the multiplexing / demultiplexing unit 5 of the control package 6, and the multiplexing / demultiplexing unit 5 converts the primary separated data 15_1 and 15_2 into the back wiring board (BWB) 20. L2 switches 10d_1 and 10d_2 (hereinafter sometimes collectively referred to as “10d”) and fault detection units 16_1 and 16_2 (hereinafter collectively denoted by “16”) of each line package 2 via a transmission line such as Send it to.) The multiplexing / separating unit 5 includes a forwarding table 14, and an input terminal of the forwarding table 14 is connected to an output terminal of the communication unit 13.

  An output terminal of each failure detection unit 16 of each line package 2 is connected to an input terminal of the setting unit 11, and an input / output terminal of the setting unit 11 is connected to two input / output terminals of the communication unit 13 of the control package. The other output terminal is connected to the L2 switch 10d. The output ports 7d_1 and 7d_2 of the L2 switch 10d (hereinafter sometimes collectively referred to as “7d”) are connected to the downlink LAN lines 1d_1 and 1d_2 (hereinafter sometimes collectively referred to as “1d”). Has been.

  Further, the detour ports 9_1 and 9_2 of each L2 switch 10d are connected by a detour route 18d.

  In the above configuration, the forwarding table 14 of the control package 6 indicates the destination of the data of the downlink higher line 4d, and stores two destinations in the normal state and the failure state in advance. In the normal state, the communication unit 13 Is switched to the normal destination.

  In addition, each setting unit 11 that controls the interconnection between each port of the L2 switch 10d of the line package 2 is configured so that each output port 7d outputs data from each input port 8d in a normal state. Setting information of 10d is set.

  Accordingly, the multiplexing / demultiplexing unit 5 primarily transfers the data of the downlink higher level line 4d to the two line packages 2 corresponding to the destination indicated by the forwarding table 14, and in each line package 2 that has received this, the L2 switch 10d further separates the primary separation data 15_1 and 15_2 further based on the setting information of the setting unit 11, and sends them to each downlink LAN line 1d from each output port 7d.

  Here, when the primary separation data 15_1 is disconnected for some reason (indicated by a cross in the figure), the failure detection unit 16_1 of the line package 2_1 detects the disconnection state and notifies the setting unit 11_1. The setting unit 11_1 changes the setting so that the output port 7d_1 outputs the data input from the bypass port 9_1 instead of the data from the input port 8d_1 to the L2 switch 10d_1, and the communication unit of the control package 6 13 is notified that the switching has been performed.

  Upon receiving the notification, the communication unit 13 switches the destination of the forwarding table 14 from the normal state to the destination at the time of failure, and also issues a setting change instruction to the setting unit 11_2 of the line package 2_2.

  The multiplexing / demultiplexing unit 5 detours and transfers the primary separation data 15_1 to the line package 2_2 corresponding to the destination at the time of the failure. The setting unit 11_2 changes the setting to the L2 switch 10d_2, and the L2 switch 10d_2 further separates the primary separation data 15_1 that has been detoured to the input port 8d_2 as the primary separation data 15_2, and further performs a secondary separation. Output to 9_2.

  The secondary separation data output from the detour port 9_2 is detoured to the detour port 9_1 of the line package 2_1 via the detour route 18d, and the downlink LAN line 1d_1 is set by the L2 switch 10d_1 that has already been changed to the line package 2_1. Is sent out.

  Accordingly, when the primary separation data 15_1 of the line package 2_1 is in a disconnected state, the line package 2_2 becomes a relief package via the bypass port 9_1, and therefore the data of the downlink LAN line 1d_1 without using the spare line package. Can be remedied.

  Further, even when the primary separation data 15_2 of the line package 2_2 is in a disconnected state, the line package 2_1 becomes a relief package in the same manner. In this case, the data on the downlink LAN line 1d_2 is also rescued without using the backup line package. can do.

  Further, as described above, the bypass ports 9 connected to each other function in both directions, so that each line package 2 connected by the bypass port 9 is fixed 1 like a conventional spare line package. Rather than relieving only one line package, mutual redress is possible.

  Further, the L2 switch 10d of each line package 2 secondarily separates the bypassed primary separation data into data for the downlink LAN line 1d and the bypass data based on the setting of the setting unit 11, and the bypass data Can be output to the bypass port 9.

  In order to solve the above-described problem, the packet communication device according to the present invention (3) accommodates a plurality of uplink LAN lines each assigned a priority class, and stores data on the uplink LAN line as a primary. Two line packages that are multiplexed and output, and a control package having a multiplexing / demultiplexing unit that further secondary-multiplexes the primary multiplexed data of each line package and transmits it to the upstream upstream line, and each line package includes: An L2 switch having a high-priority input port, a low-priority input port, an output port for the primary multiplexed data, and a detour port for the uplink LAN line, and outputting data traffic information, and interconnecting ports of the L2 switch A setting unit for controlling switching is provided, each detour port is connected to each other, and the control package is configured based on each data traffic information. When two failure detection units that detect a failure state of various data congestions and one failure detection unit detects the failure state of the corresponding L2 switch, the corresponding setting unit is reconfigured to change the low priority A communication unit for switching the input port from the output port to the bypass port, thereby outputting the uplink data of the low priority line from the bypass port to the bypass port of the faulty line package It is characterized by having.

Here, the principle of the present invention (3) (upstream data discarding suppression) will be described below with reference to FIG.

  First, regarding the configuration, the high priority lines 1u_1H, 1u_2H and the low priority lines 1u_1L, 1u_2L to which the priority classes are assigned are connected to the high priority ports 15u_1, 15u_2 (in the upstream LAN line 1u of the L2 switch 10u of each line package 2. Hereinafter, they may be collectively referred to as “15u”) and low-priority ports 16u_1 and 16u_2 (hereinafter, sometimes collectively referred to as “16u”), and are connected to the output ports of each L2 switch 10u. 8 u is connected to the input terminal of the multiplexer / demultiplexer 5 of the control package 6 via a back wiring board (BWB) 20 or the like.

  Further, the output terminals of the traffic information 17_1 and 17_2 (hereinafter may be collectively referred to as “17”) of each L2 switch 10u are connected to the input terminals of the two failure detection units 12.

  Further, the output terminal of the multiplexing / demultiplexing unit 5 of the control package 6 is connected to the upstream upstream line 4u, the output terminal of each failure detecting unit 12 is connected to each input terminal of the communication unit 13, and the communication unit 13 Are connected to the input terminals of the setting units 11 of the line packages 2, and the output terminals of the setting units 11 are connected to the L2 switches 10u.

  Further, the detour ports 9 of each L2 switch 10u are connected by a detour route 18u.

  In the above configuration, in the normal state, each setting unit 11 that controls the interconnection between the ports of the L2 switch 10u outputs the data of the input ports 15u and 16u to the output ports 8u. Is set. Accordingly, the L2 switch 10u of each line package 2 performs primary multiplexing on the data of each uplink LAN line 1u that has entered from the input ports 15u and 16u based on the setting information of the setting unit 11, and outputs the result to the output port 8u. Then, the primary multiplexed data 3 is transferred to the multiplexing / demultiplexing unit 5 of the control package 6 via the transmission path constituted by the BWB 20, where it is secondarily multiplexed and sent to the upstream upstream line 4u. It has become.

  Here, when the traffic on the uplink LAN line 1u_1 is congested, the L2 switch 10u_1 sends the traffic information 17_1 to the failure detection unit 12_1 of the control package 6. The failure detection unit 12_1 detects the data congestion state and notifies the communication unit 13, and the communication unit 13 changes the setting to the setting unit 11_1 of the line package 2_1. Since the L2 switch 10u_1 switches the output of the low priority line 1u_1L that has entered the low priority port 16u_1 from the output port 8u_1 to the bypass port 9_1 based on the setting change, the data of the low priority line 1u_1L Then, a detour is made to the detour port 9_2 of the line package 2_2 via the detour route 18u.

  The data bypassed to the bypass port 9_2 is primarily multiplexed together with the data of the input port 15u_2 of the L2 switch 10u_2, transferred from the output port 8u_2 to the multiplexing / demultiplexing unit 5 of the control package 6, and multiplexed / separating unit 5 Is further subjected to secondary multiplexing and sent to the upstream upstream line 4u.

  Accordingly, when the traffic on the upstream LAN line 1u_1 of the line package 2_1 becomes congested, the line package 2_2 becomes a relief package via the bypass port 9, so that a large capacity buffer is provided or the number of accommodated lines It is possible to suppress discarding of particularly low priority line data in the uplink LAN line 1u_1 without reducing the amount of data.

  Further, even when the traffic on the uplink LAN line 1u_2 of the line package 2_2 becomes congested, the line package 2_1 becomes a relief package in the same manner, and in this case as well, discarding of low priority line data can be suppressed. .

  Further, as described above, the bypass ports 9 connected to each other function in both directions, so that each line package 2 connected by the bypass port 9 suppresses data discarding of only one fixed line package. Rather than doing so, mutual suppression is possible.

  Further, the L2 switch 10u of each line package 2 converts the uplink data input from the detour port 9 based on the setting of the setting unit 11 into the input port 15u of the uplink LAN line 1u with the priority class. Together with the 16 u upstream data, the primary multiplexing can be performed and output to the control package 6.

  Furthermore, in order to solve the above-described problem, the packet communication device according to the present invention (4) includes two data specified by the forwarding table in which the downlink upper line data is stored in advance in the normal state and the destination at the time of the failure. Multiplexing / separating unit for primary separation into a route, a control package having two failure detection units each buffering and transmitting the primary separation data of each route, and each primary separation data is further subjected to secondary separation. Two line packages that are separated into data and transmitted to a plurality of downlink LAN lines with priority classes, and each line package includes a high-priority output port, a low-priority output port of the downlink LAN line, Each detour port includes an L2 switch having an input port for primary separation data and a detour port, and a setting unit that controls switching of each port interconnection of the L2 switch. When one of the failure detection units detects a failure state of data congestion due to the buffering overflow, the corresponding setting unit is reconfigured to change the low priority output port to the low priority output port. A communication unit that switches connection from the input port to the detour port, switches the forwarding table to the destination at the time of the failure, and detours the primary separation data to the non-failure line package; The L2 switch of the package, based on the setting of the setting unit, outputs the bypassed primary separation data from the bypass port and bypasses it to the bypass port of the line package corresponding to the failure Yes.

Here, the principle of the present invention (4) (downlink data discarding suppression) will be described below with reference to FIG.

  First, regarding the configuration, the downlink higher line 4d is connected to the input terminal of the multiplexing / demultiplexing unit 5 of the control package 6, and its two output terminals are connected to the input terminals of the respective fault detection units 12, The primary separation data output terminal of each failure detection unit 12 is connected to the input ports 8d_1 and 8d_2 of the primary separation data 15_1 and 15_2 of each line package 2 via a back wiring board (BWB) 20 and the like.

  Further, the failure information output terminal of each failure detection unit 12 is connected to the input terminal of the communication unit 13, and the communication unit 13 is connected so as to control the forwarding table 14.

  The communication unit 13 is connected to the setting unit 11 of each line package 2 so as to be capable of bidirectional communication. The output terminals of the setting units 11 are connected to the L2 switch 10d, respectively, and high priority ports 15d_1 and 15d_2 (hereinafter may be collectively referred to as “15d”) on the downlink LAN line 1d of the L2 switch 10d and low. High priority lines 1d_1H and 1d_2H and low priority lines 1d_1L and 1d_2L, which are classified in priority order, are connected to priority ports 16d_1 and 16d_2 (hereinafter may be collectively referred to as “16d”). .

  Further, the detour ports 9_1 and 9_2 of each L2 switch 10d are connected by a detour route 18d.

  In the above configuration, the forwarding table 14 of the control package 6 indicates the destination of the data of the downlink higher line 4d, and stores two destinations in the normal state and the failure state in advance. In the normal state, the communication unit 13 Is switched to the normal destination.

  The failure detection unit 12 transfers the data from the multiplexing / demultiplexing unit 5 to the line package while buffering it in a buffer (not shown), and when the buffer space becomes small, the traffic congestion information is sent to the communication unit 13. It is designed to output.

  That is, the multiplexing / demultiplexing unit 5 primarily separates the data of the downlink higher level line 4d for the two line packages 2 corresponding to the destination indicated by the forwarding table 14, and transfers the data to the buffer of the failure detecting unit 12. Reads the primary separation data 15 from the buffer and transfers it to the line package 2 and monitors the free state of the buffer.

  On the other hand, each setting unit 11 that controls interconnection between the ports of the L2 switch 10d of each line package 2 controls the L2 switch 10d so that each output port 15d outputs data from the input port 8d in a normal state. The L2 switch 10d that has received this information further separates the primary separation data 15 based on the setting information of the setting unit 11 and further separates the primary separation data 15 from the output ports 15d and 16d. It is sent to the downlink LAN line 1d.

  Here, when the buffer free space of the failure detection unit 12_1 becomes equal to or less than a predetermined value, the failure detection unit 12_1 outputs traffic congestion information to the communication unit 13, and the communication unit 13 sets the setting information of the L2 switch 11_1 to the setting unit 11_1. Instruct to change.

  Upon receiving the instruction, the setting unit 11_1 changes the setting information so that the output port 16d_1 outputs not the data from the input port 8d_1 but the data input from the bypass port 9_1 to the L2 switch 10d_1. The communication unit 13 of the control package 6 is notified that the switching has been performed.

  Upon receiving the notification, the communication unit 13 switches the destination of the forwarding table 14 from the normal time to the destination at the time of failure, and also issues a setting information change instruction to the setting unit 11_2 of the line package 2_2.

  The multiplexing / demultiplexing unit 5 detours and transfers the primary separation data 15_1 toward the line package 2_2 corresponding to the destination at the time of the failure, and the setting unit 11_2 changes the setting information to the L2 switch 10d_2, and the L2 switch 10d_2 The primary separation data 15_1 that has been detoured to the input port 8d_2 as the primary separation data 15_2 is further secondarily separated and output to the detour port 9_2.

  The secondary separation data output from the detour port 9_2 is diverted to the detour port 9_1 of the line package 2_1 via the detour route 18d, and the downlink LAN line is set by the L2 switch 10d_1 whose setting has already been changed in the line package 2_1. It is sent to the low priority line 1d_1L.

  Accordingly, when the primary separation data 15_1 of the line package 2_1 becomes congested, the line package 2_2 becomes a relief package through the bypass port 9_1, and traffic is smoothed. Data discard of the downlink LAN line 1d_1 can be suppressed without reducing the number of accommodated lines.

  Even when the primary separation data 15_2 of the line package 2_2 becomes congested, the line package 2_1 becomes a relief package in the same manner. In this case as well, a large capacity buffer is provided or the number of accommodated lines is reduced. Without discarding data on the downlink LAN line 1d_2.

  Further, as described above, the bypass ports 9 connected to each other function in both directions, so that each line package 2 connected by the bypass port 9 suppresses data discarding of only one fixed line package. Rather than doing so, mutual suppression is possible.

  In addition, the L2 switch 10d of each line package 2 uses the setting of the setting unit 11 to secondary-convert the primary separated data to the downlink LAN line 1d and the detour data that have been assigned a priority order. The bypass data can be output to the bypass port 9 after being separated.

  Further, the detour ports 9 can be connected to each other by a cable or a wiring pattern of a back wiring board.

  Each bypass port 9 can use an empty port of each L2 switch 10u, 10d.

  In the packet communication apparatus according to the present invention, each line package includes a bypass port that uses an empty port of the L2 switch, and includes a bypass route that connects the bypass port in both directions. There is an advantage that it is possible to relieve without requiring a fixed standby line package.

  Further, the detour route for connecting the detour ports can be constituted by a wiring pattern or a cable of a back wiring board (BWB), and there is an advantage that a switching circuit such as a relay is unnecessary.

  As a result, there is no need for mounting space for conventional standby line packages and switching circuits, and as many line packages can be mounted, the volume per number of accommodated LAN lines is reduced, and the device can be easily reduced in size and cost. There is an advantage of becoming.

  In addition, the packet communication device of the present invention constantly monitors the traffic of the line package and dynamically or flexibly changes the route, so there is an advantage that data discarding is suppressed by smoothing the traffic.

  Also, by constantly monitoring the traffic of each line package with the control package, switching the LAN line to a line package with less traffic in a congested state, and dynamically returning to the original state when recovering from the congested state Therefore, non-stop communication without data discard due to congestion can be realized.

  Similarly, if the control package sets a bypass route in consideration of the priority order of each LAN line, COS (Class of Service) can be provided as a function of the apparatus.

Furthermore, according to the present invention, as shown in Table 1, since the circuit package twice as many as the number of detour routes can be relieved, there is an advantage that the quality assurance is improved more efficiently. (Note that Table 1 shows a case where four LAN lines are accommodated per line package.)

  Examples (1) to (4) corresponding to the principle diagrams of the present invention shown in FIGS. 1 to 4 will be described below with reference to FIGS.

Example (1): FIG. 5 (Relief of Uplink Data)
FIG. 5 shows an embodiment of a packet communication apparatus according to the present invention (1). First, in each line package 2, a plurality of upstream LAN lines 1u are connected to the input port 7u of the L2 switch 10u, and the output port 8u of the L2 switch 10u is a wiring pattern of a BWB (back wiring board) 20. The control package 6 is connected to the input terminal of the multiplexing / separation unit 5 and the input terminal of the failure detection unit 12, respectively, and the output terminal of each setting unit 11 is connected to each L2 switch 10u.

  On the other hand, in the control package 6, the output terminal of the multiplexing / demultiplexing unit 5 is connected to the upstream upstream line 4u, and the output terminals of the two failure detection units 12 are connected to the input terminals of the communication unit 13, respectively. Two output terminals of the unit 13 are respectively connected to input terminals of the setting unit 11 of each line package 2.

  Further, the detour ports 9 of each L2 switch 10u are connected by a detour bus 19 constituted by a wiring pattern on the BWB 20.

  In such a configuration, in a normal state, the control package 6 performs initial setting in each setting unit 11 via the communication unit 13, and the L2 switch 10u outputs data of each input port 7u to each output port 8u. The bypass port 9 is electrically open on the BWB 20 (inactive state).

  Therefore, in a normal state, the L2 switch 10u of each line package 2 performs primary multiplexing of the data of each uplink LAN line 1u from the input port 7u based on the setting information of the setting unit 11 and outputs the result to the output port 8u. Therefore, the primary multiplexed data 3 is transferred to the multiplexing / demultiplexing unit 5 of the control package 6 via the BWB 20, and the multiplexing / demultiplexing unit 5 further performs secondary multiplexing to the upstream upper line (for example, WAN). To send.

  Here, when the primary multiplexed data 3_1 of the line package 2_1 is disconnected for some reason (indicated by a cross in the figure), the failure detection unit 12_1 of the control package 6 detects the disconnection state and sends it to the communication unit 13. Then, the communication unit 13 selects an optimum line package as a rescue destination from the communication state (traffic amount) of each line package 2 (assuming that the line package 2_2 is optimum in FIG. 5), and the line package. The setting is changed to the setting unit 11_2 of 2_2, and the bypass port 9_2 of the L2 switch 10u_2 is activated. Further, the setting unit 11_1 is also changed in setting so that the data input to the input port 7u_1 of the L2 switch 10u_1 is switched to be output from the output port 8u_1 to the bypass port 9_1 and the bypass port 9_1 is activated.

  Therefore, the data of the uplink LAN line 1u_1 of the line package 2_1 is output from the bypass port 9_1 and input to the bypass port 9_2 of the line package 2_2 via the bypass bus 19, and the data of the input port 7u_2 of the L2 switch 10u_2 The signals are first multiplexed together and transferred from the output port 8u_2 to the multiplexing / demultiplexing unit 5 of the control package 6, and the multiplexing / demultiplexing unit 5 further performs secondary multiplexing and transmits it to the upstream higher line 4u.

  As described above, the uplink LAN line data of the line package 2_1 blocked by the path failure of the primary multiplexed data 3_1 instantaneously bypasses the line package 2_2 having a path without a failure via the bypass bus between the line packages 2. Then, it is transmitted to the upstream higher line 4u.

  In addition, when the primary multiplexed data 3_2 of the line package 2_2 encounters the above-described failure, the line package 2_1 is diverted as a relief package in the same manner.

  That is, by using the empty port of the L2 switch 10u mounted in the line package 2 as the detour port 9 and connecting the detour ports with the detour bus 19, the data of the upstream LAN line 1u can be used without using the spare line package. Can be remedied instantly.

  Further, since the bypass ports 9 connected to each other function bidirectionally as described above, each line package 2 connected by the bypass port 9 is fixed as in the conventional standby line package. Rather than relieving only one line package, mutual redress is possible.

  Further, the L2 switch 10u of each line package 2 sends the uplink data input from the bypass port 9 together with the uplink data to the input port 7u of the uplink LAN line 1u based on the setting of the setting unit 11. The primary multiplexing can be performed and output to the control package 6.

Example (2): FIG. 6 (Relief of Downlink Data)
FIG. 6 shows an embodiment of a packet communication apparatus according to the present invention (2). First, the downstream upper line 4d is connected to the input terminal of the multiplexing / demultiplexing unit 5 of the control package 6, and the two outputs thereof are the BWB 20 wiring and the input ports 8d_1 and 8d_2 of the L2 switch 10d of each line package 2 and fault detection The units 16_1 and 16_2 are connected to the input terminals, respectively, and the output of the communication unit 13 is connected to the input terminal of the forwarding table 14.

  The output terminal of the fault detection unit 16 of each line package 2 is connected to the input terminal of the setting unit 11 and the input / output terminals thereof are the two input / output terminals of the communication unit 13 of the control package and the wiring of the BWB 20. (Indicated by broken lines with double arrows in the figure.) Each is connected, each remaining output terminal is connected to the L2 switch 10d, and each output port 7d_1, 7d_2 of the L2 switch 10d is a downlink LAN line. 1d_1 and 1d_2 are connected to each other.

  Further, the detour ports 9 of each L2 switch 10d are connected by a detour bus 19 configured by a wiring pattern on the BWB 20.

  In such a configuration, the forwarding table 14 of the control package 6 indicates the destination (address) of the data of the downlink upper line 4d, and stores addresses at the normal time and at the time of failure in advance. Switch to the normal address.

  Further, the setting unit 11 of each line package 2 sets each L2 switch 10d so that the output port 7d outputs data from the input port 8d in a normal state, and further sets the bypass port 9 on the BWB 20 Electrically set to the open state (inactive state).

  Accordingly, the multiplexing / demultiplexing unit 5 primarily transfers the data of the downlink upper line 4d to the line package 2 having the address indicated by the forwarding table 14, and in each line package 2 that receives the data, the L2 switch 10d sets the data. Based on the setting information of the unit 11, the primary separation data 15 is further subjected to secondary separation and transmitted to each downlink LAN line 1d of each output port 7d.

  Here, when the primary separation data 15_1 is disconnected for some reason (indicated by a cross in the figure), the failure detection unit 16_1 of the line package 2_1 detects the disconnection state and notifies the setting unit 11_1 for setting. The unit 11_1 switches the setting in which the output port 7d_1 of the L2 switch 10d_1 outputs the data of the input port 8d_1 to output the data input from the bypass port 9_1 and sets the bypass port 9_1 to the active state Further, the communication unit 13 of the control package 6 is notified of the completion of the switching.

  The communication unit that has received the notification of the completion of switching selects an optimum line package as a relief destination from the communication state (traffic amount) of each line package (in this example, it is assumed that the line package 2_2 is optimum), and the relief is performed. The address of the line package 2_2 according to the above is switched from the normal time to the address at the time of failure stored in the forwarding table 14 in advance, and the bypass port 9_2 is also activated for the setting unit 11_2 of the line package 2_2 To change the setting.

  Therefore, the multiplexing / demultiplexing unit 5 detours the primary separation data toward the circuit package 2_2 of the address at the time of the failure, and the L2 switch 10d_2 transfers the primary separation data 15_2 detoured to the input port 8d_2 to the setting unit. Based on the setting information of 11_2, further secondary separation is performed and output to the detour port 9_2.

  The secondary separation data output from the detour port 9_2 in this way is detoured to the detour port 9_1 of the line package 2_1 and transmitted to the downlink LAN line 1d_1 by the L2 switch 10d_1 whose setting has already been changed in the line package 2_1. Is done.

  Therefore, the primary separation data 15_1 of the line package 2_1 blocked by the path failure instantaneously bypasses the line package 2_2 having a path without failure via the bypass bus 19 between the line packages 2, and the downlink LAN line 1d_1 Will be sent to.

  In addition, when the primary separation data 15_2 of the line package 2_2 encounters the above-described failure, the line package 2_1 becomes a relief package in the same manner and is bypassed.

  Therefore, by using the empty port of the L2 switch 10d mounted on the line package 2 as the bypass port 9 and connecting the bypass ports with the bypass bus 19, the data of the downlink LAN line 1d can be used without using the backup line package. Can be remedied instantly.

  Further, since the bypass ports 9 connected to each other function bidirectionally as described above, each line package 2 connected by the bypass port 9 is fixed as in the conventional standby line package. Rather than relieving only one line package, mutual redress is possible.

  Further, the L2 switch 10d of each line package 2 secondarily separates the bypassed primary separation data into data for the output port 7d of the downlink LAN line 1d and bypass data based on the setting of the setting unit 11. Thus, the bypass data can be output to the bypass port 9.

Example (3): FIG. 7 (upstream data discard suppression)
FIG. 7 shows an embodiment of a packet communication apparatus according to the present invention (3). First, the high priority lines 1u_1H and 1u_2H and the low priority lines 1u_1L and 1u_2L with the priority classes are connected to the input ports 15u_1 and 15u_2 and 16u_1 and 16u_2 of the upstream LAN line of the L2 switch 10u of each line package 2, respectively. The output port 8 u of each L2 switch 10 u is connected to the input terminal of the multiplexer / demultiplexer 5 of the control package 6 via the BWB 20.

  Further, the output terminals of the traffic information 17_1 and 17_2 of each L2 switch 10u are connected to the input terminals of the respective fault detection units 12.

  Further, the output terminal of the multiplexing / demultiplexing unit 5 of the control package 6 is connected to the upstream upstream line 4u, the output terminal of each failure detecting unit 12 is the input terminal of the communication unit 13, and the two output terminals of the communication unit 13 are Each line package 2 is connected to an input terminal of each setting unit 11 (indicated by a broken line in the figure), and an output terminal of each setting unit 11 is connected to each L2 switch 10u.

  Further, the detour ports 9 of each L2 switch 10u are connected by a detour bus 19 configured by a wiring pattern on the BWB 20.

  In the above configuration, in the normal state, each setting unit 11 of the L2 switch 10u sets each L2 switch 10u to output the data of each input port 15u, 16u to each output port 8u. The port 9 is electrically set in the open state (inactive state) in the BWB 20.

  Accordingly, the L2 switch 10u of each line package 2 performs primary multiplexing of the data of each uplink LAN line 1u from the input ports 15u and 16u based on the setting information of the setting unit, and outputs to the output port 8u. The multiplexed data 3 is transferred to the multiplexing / separating unit 5 of the control package 6 through the wiring of the BWB 20, and the traffic information 17 indicating the traffic state of each L2 switch 10 u that changes from time to time is used to detect the failure of the control package 6. Sent to the unit 12.

  In such a state, when the traffic on the uplink LAN line 1u_1 is congested, the failure detection unit 12_1 detects the data congestion state and notifies the communication unit 13, and the communication unit 13 communicates the communication state (traffic) of each line package 2. The optimal line package is selected for the detour destination (in FIG. 7, it is assumed that the line package 2_2 is optimal), and the setting is changed to the setting unit 11_2 of the line package 2_2 to bypass the L2 switch 10u_2 Activate port 9_2. In addition, the setting unit 11_1 is also changed in setting so that the L2 switch 10u_1 switches the data of the low priority line 1u_1L of the input port 16u_1 to be output from the output port 8u_1 to the bypass port 9_1, and the bypass port 9_1 is switched. Activate.

  In this way, the data of the low priority line 1u_1L output to the bypass port 9_1 is diverted to the bypass port 9_2 of the line package 2_2 through the bypass bus of the BWB 20.

  The L2 switch 10u_2 of the line package 2_2 primarily multiplexes the data detoured to the bypass port 9_2 together with the data of the input port 15u_2, and multiplexes the primary multiplexed data 3_2 from the output port 8u_2 to the control package 6 The data is transferred to the demultiplexing unit 5, and the multiplexing / demultiplexing unit 5 further performs secondary multiplexing and transmits the result to the upstream upstream line 4 u.

  As described above, when the traffic on the uplink LAN line 1u_1 of the line package 2_1 becomes congested, the data of the low priority line 1u_1L is diverted to the line package 2_2 having a sufficient bandwidth through the detour port 9. Since the traffic is smoothed, it is possible to suppress data discard of the upstream LAN line 1u_1 without providing a large capacity buffer or reducing the number of accommodated lines.

  Even when the traffic on the upstream LAN line 1u_1 of the line package 2_2 becomes congested, the line package 2_1 becomes a detour destination package in the same way, and the traffic is smoothed. Data discard of the upstream LAN line 1u_2 can be suppressed without reducing the number.

  Further, as described above, the bypass ports 9 connected to each other function bidirectionally, so that each line package 2 connected by the bypass port 9 is not only one fixed line package, Data discard can be suppressed.

  In addition, since the optimum line package is selected as the detour destination from the communication state (traffic amount) of each line package 2, the traffic smoothing can be optimized according to the communication situation at that time for the detour destination of the line package.

  Further, the L2 switch 10u of each line package 2 converts the uplink data input from the detour port 9 based on the setting of the setting unit 11 into the input port 15u of the uplink LAN line 1u with the priority class. Together with the upstream data from 16u, the primary multiplexing can be performed and output to the control package 6.

Example (4): FIG. 8 (Drop data discard suppression)
FIG. 8 shows an embodiment of a packet communication apparatus according to the present invention (4). First, the downstream upper line 4d is connected to the input terminal of the multiplexing / demultiplexing unit 5 of the control package 6, and its two output terminals are connected to the input terminal of the transmission buffer 12 as each failure detecting unit. Output terminals of primary separated data of the transmission buffer 12 as a failure detection unit are connected to input ports 8d_1 and 8d_2 of each L2 switch 10d of each line package 2 via the BWB 20, respectively.

  Further, the output terminal of each failure detection unit 12 is connected to the input terminal of the communication unit 13, and one of the output terminals of the communication unit 13 is connected to the input terminal of the forwarding table 14.

  Further, the remaining two input / output terminals of the communication unit 13 are connected to the input / output terminals of the setting unit 11 of each line package 2 by the wiring of the BWB 20, and the output terminals of the setting units 11 are connected to the L2 switch 10d. Each is connected. The high priority lines 1d_1H and 1d_2H and the low priority lines 1d_1L and 1d_2L, which are assigned priority levels, are connected to the output ports 15d_1, 15d_2 and 16d_1 and 16d_2 of the downlink LAN line of the L2 switch 10d, respectively.

  Further, the detour ports 9_1 and 9_2 of each L2 switch 10d are connected by a detour bus 19 configured by a wiring pattern on the BWB 20.

  In the above configuration, the forwarding table 14 of the control package 6 stores in advance the addresses that are the destinations of the data of the downlink upper line 4d in the normal state and in the fault state, and in the normal state the communication unit is in the normal state. Switch to indicate the address.

  Accordingly, in a normal state, the multiplexing / separating unit 5 distributes the data of the downlink higher line 4d for each line package 2 having the address indicated by the forwarding table 14, that is, the transmission buffer 12 as a failure detecting unit corresponding to the primary separation. Each failure detection unit 12 buffers it, transfers it to the line package 2, and monitors the free state of the transmission buffer 12. When the free space of the buffer becomes less than a predetermined value, The traffic congestion alarm is output to the communication unit 13.

  On the other hand, the setting unit 11 of each line package 2 in the normal state sets the L2 switch 10d so that the output ports 15d and 16d output data from the input port 8d, and further sets the bypass port 9 An electrically open state (inactive state) is set on the BWB 20.

  Accordingly, the L2 switch 10d further performs secondary separation of the primary separation data 15 based on the setting information of the setting unit 11 and transmits it to each downlink LAN line 1d assigned with the priority order from the output ports 15d and 16d. It is like that.

  When operating in this way, when the traffic addressed to the line package 2_1 increases and the buffer free space falls below a predetermined value, the transmission buffer 12_1 as a failure detection unit outputs a traffic congestion alarm to the communication unit 13, The communication unit 13 selects an optimal line package as a detour destination from the communication state (traffic amount) of each line package 2 (in FIG. 8, it is assumed that the line package 2_2 is optimal), and the line related to the detour destination The address of the package 2_2 is switched from the normal time to the address at the time of failure stored in the forwarding table 14 in advance, and also set for the setting unit 11_2 of the line package 2_2 to activate the bypass port 9_2 Direct change.

  The communication unit 13 also changes the setting of the setting unit 11_1 so that the L2 switch 10d_1 switches the data of the low priority line 1d_1L of the output port 16d_1 from the input port 8d_1 to the detour port 9_1 and sets the detour port 9_1. Activate.

  The multiplexing / demultiplexing unit 5 detours the primary separation data toward the line package 2_2 corresponding to the address at the time of the failure, and the setting unit 11_2 instructed to change the setting changes the setting of the L2 switch 10d_2. The switch 10d_2 further performs secondary separation on the primary separation data 15_2 that has been detoured to the input port 8d_2, and outputs it to the detour port 9_2.

  The secondary separation data output from the detour port 9_2 detours to the detour port 9_1 of the line package 2_1 and is transmitted to the downlink LAN line by the L2 switch 10d_1 whose setting has already been changed in the line package 2_1.

  Therefore, when the primary separation data 15_1 of the line package 2_1 is in a congested state, the traffic is smoothed by the data of the low priority line being diverted to the line package 2_2 not in the congested state via the detour port 9_1. Therefore, it is possible to suppress data discard of the downlink LAN line 1d_1 without providing a large capacity buffer or reducing the number of accommodated lines.

  Even if the primary separation data 15_2 of the line package 2_2 becomes congested, the line package 2_1 becomes a relief package in the same manner. In this case, too, a large-capacity buffer is provided or the number of accommodated lines is reduced. Without discarding data on the downlink LAN line 1d_2.

  Further, as described above, the bypass ports 9 connected to each other function in both directions, so that each line package 2 connected by the bypass port 9 suppresses data discarding of only one fixed line package. Rather than doing so, mutual suppression is possible.

  Further, the L2 switch 10d of each line package 2 uses the demultiplexed primary separated data as secondary data for the output ports 15d and 16d of the downlink LAN line 1d and the detour data based on the setting of the setting unit 11. The bypass data can be output to the bypass port 9 after being separated.

Further, by using the empty port of the L2 switch 10d as the bypass port, further downsizing and economy can be achieved.

(Appendix 1)
Two line packages each of which accommodates a plurality of uplink LAN lines and outputs the data of the uplink LAN lines by primary multiplexing;
A control package having a multiplexing / demultiplexing unit that further secondary-multiplexes the primary multiplexed data of each line package and transmits it to the upstream upstream line,
Each line package includes an L2 switch having a bypass port in addition to an input port of the uplink LAN line and an output port of the primary multiplexed data, and a setting unit that controls switching of each port interconnection of the L2 switch , Each detour port is connected,
When the control package detects the failure state of each primary multiplexed data, and when one failure detection unit detects the failure state of the primary multiplexed data, the corresponding line package setting unit To change the setting of the input port and switch the connection from the output port to the bypass port, thereby outputting the data from the bypass port of the line package corresponding to the failure to bypass the faulty line package. A packet communication apparatus comprising: a communication unit that bypasses the communication port.
(Appendix 2)
A control package having a multiplexing / demultiplexing unit that primarily separates the data of the downlink upper line into two paths designated by a forwarding table in which destinations at normal time and failure time are stored in advance;
Two line packages for further separating the primary separated data into secondary separated data and transmitting them to a plurality of downlink LAN lines,
A failure detection unit for detecting a disconnection state of the primary separated data, an L2 switch having a bypass port in addition to the primary separated data input port and the downlink LAN line output port, and the L2 switch And a setting unit that controls switching of each port interconnection. When each of the bypass ports is connected, and when one failure detection unit detects the disconnection state of the primary separation data, the corresponding setting is performed. And switching the connection of the output port from the input port to the bypass port,
The control package further includes a communication unit that, when the setting unit changes the setting, switches the forwarding table to the destination at the time of the failure and bypasses the primary separation data to the line package without the failure,
Based on the setting of the setting unit, the L2 switch of the line package without the failure outputs the bypassed primary separation data from the detour port to detour to the detour port of the line package corresponding to the failure A packet communication device characterized in that
(Appendix 3)
Two line packages each of which accommodates a plurality of uplink LAN lines with priority classes and outputs data of the uplink LAN lines by primary multiplexing;
A control package having a multiplexing / demultiplexing unit that further secondary-multiplexes the primary multiplexed data of each line package and transmits it to the upstream upstream line,
Each line package has a high-priority input port, a low-priority input port, an output port for the primary multiplexed data, and a bypass port for the uplink LAN line, and outputs data traffic information, and the L2 switch It has a setting part that controls switching of each port interconnection, and each detour port is connected,
When the control package detects a failure state of each data congestion from each data traffic information, and when one failure detection unit detects the failure state of the corresponding L2 switch, By changing the setting unit and switching the low-priority input port from the output port to the bypass port, the uplink data of the low-priority line is output from the bypass port and the fault-free line is output. A packet communication device comprising: a communication unit that bypasses a bypass port of a package.
(Appendix 4)
Multiplexer / separator that primarily separates the data of the downlink upper line into two routes designated by a forwarding table in which destinations at normal times and failures are stored in advance, and the primary separated data of each route respectively A control package having two failure detection units that are buffered and sent out;
Each of the primary separation data is further divided into secondary separation data, and two line packages are transmitted to a plurality of downlink LAN lines with priority classes,
Each line package controls an L2 switch having a high-priority output port and a low-priority output port of the downlink LAN line, an input port for the primary separation data, and a bypass port, and switching of each port interconnection of the L2 switch Each detour port is connected to each other,
When the control package detects a failure state of data congestion due to the overflow of the buffering in one failure detection unit, the corresponding setting unit is reconfigured so that the low-priority output port is used for the bypass from the input port. A communication unit for switching the connection to the port, and switching the forwarding table to the destination at the time of the failure to bypass the primary separation data to the line package without the failure,
Based on the setting of the setting unit, the L2 switch of the line package without the failure outputs the bypassed primary separation data from the detour port to detour to the detour port of the line package corresponding to the failure A packet communication device characterized in that
(Appendix 5) In Appendix 1 or 3,
Based on the setting of the setting unit, the L2 switch of the line package having no failure combines the upstream data input from the bypass port together with the upstream data to the input port of the upstream LAN line of the line package. In addition, the packet communication apparatus is characterized in that the first multiplexing and the output to the control package.
(Appendix 6) In Appendix 2 or 4,
Based on the setting of the setting unit, the L2 switch of the line package without the failure secondarily separates the bypassed primary separation data into data for the downlink LAN line and the bypass data of the line package, and A packet communication apparatus that outputs detour data to the detour port.
(Appendix 7) In any one of Appendices 1 to 4,
The packet communication device, wherein the bypass ports are connected by a cable or a wiring pattern of a back wiring board.
(Appendix 8) In any one of Appendices 1 to 4,
A packet communication apparatus characterized in that the bypass port can use an empty port of an L2 switch.

It is a block diagram which shows the principle (rescue of upstream data) of the packet communication apparatus according to the present invention (1). It is a block diagram which shows the principle (relief of downlink data) of the packet communication apparatus which concerns on this invention (2). It is a block diagram which shows the principle (upstream data discard suppression) of the packet communication apparatus which concerns on this invention (3). It is a block diagram which shows the principle (discarding | rejection suppression of downlink data) of the packet communication apparatus which concerns on this invention (4). It is a block diagram which shows the Example (rescue of uplink data) of the packet communication apparatus concerning this invention (1). It is a block diagram which shows the Example (relief of downlink data) of the packet communication apparatus which concerns on this invention (2). It is a block diagram which shows the Example (suppression of discard of upstream data) of the packet communication apparatus which concerns on this invention (3). It is a block diagram which shows the Example (discarding | rejection suppression of downlink data) of the packet communication apparatus which concerns on this invention (4).

Explanation of symbols

1u_1, 1u_2 Uplink LAN line 1d_1, 1d_2 Downlink LAN line 1u_1H, 1u_2H, 1d_1H, 1d_2H High priority line 1u_1L, 1u_2L, 1d_1L, 1d_2L Low priority line 2, 2_1, 2_2 Line package 3_1, 3_2 Primary multiplexed data 4u Upstream upper line 4d Downstream upper line 5 Multiplexing / demultiplexing unit 6 Control packages 7u_1, 7u_2 Upstream LAN line input ports 7d_1, 7d_2 Downstream LAN line output ports 8u_1, 8u_2 Primary multiplexed data output ports 8d_1, 8d_2 Primary separated data input ports 9_1 , 9_2 Detour ports 10u_1, 10u_2, 10d_1, 10d_2 L2 switch 11_1, 11_2 Setting unit 12_1, 12_2 Fault detection unit 13 Communication unit 14 Forwarding table 15_1, 15_2 Primary separation data 15u_1, 15u_2, 15d_1, 15d_2 High priority ports 16u_1, 16u_2 , 16d_1, 16d_2 low Previous port 17_1,17_2 traffic information 18u, 18d bypass route 19 bypass bus 20 back wiring board (BWB)
In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (5)

Two line packages each of which accommodates a plurality of uplink LAN lines and outputs the data of the uplink LAN lines by primary multiplexing;
A control package having a multiplexing / demultiplexing unit that further secondary-multiplexes the primary multiplexed data of each line package and transmits it to the upstream upstream line,
Each line package includes an L2 switch having a bypass port in addition to an input port of the uplink LAN line and an output port of the primary multiplexed data, and a setting unit that controls switching of each port interconnection of the L2 switch , Each detour port is connected,
When the control package detects the failure state of each primary multiplexed data, and when one failure detection unit detects the failure state of the primary multiplexed data, the corresponding line package setting unit To change the setting of the input port and switch the connection from the output port to the bypass port, thereby outputting the data from the bypass port of the line package corresponding to the failure to bypass the faulty line package. A packet communication apparatus comprising: a communication unit that bypasses the communication port. A control package having a multiplexing / demultiplexing unit that primarily separates the data of the downlink upper line into two paths designated by a forwarding table in which destinations at normal time and failure time are stored in advance;
Two line packages for further separating the primary separated data into secondary separated data and transmitting them to a plurality of downlink LAN lines,
A failure detection unit for detecting a disconnection state of the primary separated data, an L2 switch having a bypass port in addition to the primary separated data input port and the downlink LAN line output port, and the L2 switch And a setting unit that controls switching of each port interconnection. When each of the bypass ports is connected, and when one failure detection unit detects the disconnection state of the primary separation data, the corresponding setting is performed. And switching the connection of the output port from the input port to the bypass port,
The control package further includes a communication unit that, when the setting unit changes the setting, switches the forwarding table to the destination at the time of the failure and bypasses the primary separation data to the line package without the failure,
Based on the setting of the setting unit, the L2 switch of the line package without the failure outputs the bypassed primary separation data from the detour port to detour to the detour port of the line package corresponding to the failure A packet communication device characterized in that Two line packages each of which accommodates a plurality of uplink LAN lines with priority classes and outputs data of the uplink LAN lines by primary multiplexing;
A control package having a multiplexing / demultiplexing unit that further secondary-multiplexes the primary multiplexed data of each line package and transmits it to the upstream upstream line,
Each line package has a high-priority input port, a low-priority input port, an output port for the primary multiplexed data, and a bypass port for the uplink LAN line, and outputs data traffic information, and the L2 switch It has a setting part that controls switching of each port interconnection, and each detour port is connected,
When the control package detects a failure state of each data congestion from each data traffic information, and when one failure detection unit detects the failure state of the corresponding L2 switch, By changing the setting unit and switching the low-priority input port from the output port to the bypass port, the uplink data of the low-priority line is output from the bypass port and the fault-free line is output. A packet communication device comprising: a communication unit that bypasses a bypass port of a package. Multiplexer / separator that primarily separates the data of the downlink upper line into two routes designated by a forwarding table in which destinations at normal times and failures are stored in advance, and the primary separated data of each route respectively A control package having two failure detection units that are buffered and sent out;
Each of the primary separation data is further divided into secondary separation data, and two line packages are transmitted to a plurality of downlink LAN lines with priority classes,
Each line package controls an L2 switch having a high-priority output port and a low-priority output port of the downlink LAN line, an input port for the primary separation data, and a bypass port, and switching of each port interconnection of the L2 switch Each detour port is connected to each other,
When the control package detects a failure state of data congestion due to the overflow of the buffering in one failure detection unit, the corresponding setting unit is reconfigured so that the low-priority output port is used for the bypass from the input port. A communication unit for switching the connection to the port, and switching the forwarding table to the destination at the time of the failure to bypass the primary separation data to the line package without the failure,
Based on the setting of the setting unit, the L2 switch of the line package without the failure outputs the bypassed primary separation data from the detour port to detour to the detour port of the line package corresponding to the failure A packet communication device characterized in that In claim 1 or 3,
Based on the setting of the setting unit, the L2 switch of the line package having no failure combines the upstream data input from the bypass port together with the upstream data to the input port of the upstream LAN line of the line package. In addition, the packet communication apparatus is characterized in that the first multiplexing and the output to the control package.

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