JPH08111690A - Inter-node connector, node device and grid type network system - Google Patents

Abstract

PURPOSE: To suppress the increase of the hardware amount of the system even with the increase of the number of nodes. CONSTITUTION: A node connector 200 forms a row side optical transmission line, and a node connector 300 forms a column side optical transmission line. The device 200 multiplexes the frequency of a transmitted signal from the rt of a node 100 for each row group, and this multiplex signal is distributed to three nodes 100 belonging to the row group. The device 300 multiplexes the frequency of a transmitted signal from the ct of the node 100 for each column group and the multiplex signal is distributed to three nodes 100 belonging to the column group. An optical switch 201 distributes the transmitted signal from the rt of the node 100 for each row group. Converters 202 to 210 are provided while defining three converters as one group, and the first group is composed of 202 (λ1) to 204 (λ3) to convert the frequency. The second group is composed of 205 (λ1) to 207 (λ3). The third group is composed of 208 (λ1) to 210 (λ3).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internode connecting device, a node device and a lattice type network system, which can be applied to, for example, a packet communication system suitable for high speed and large scale.

[0002]

2. Description of the Related Art In recent years, a lattice type network system has attracted attention as an optical network system for packet communication suitable for high speed and large scale.

Here, the lattice type network system is arranged such that a plurality of nodes are arranged in a lattice form and are grouped in each row and each column, and a packet is transferred by one hop between any two nodes belonging to the same group. The system is configured so that it can be transferred in two hops between any two nodes belonging to different groups via the node located at the intersection of the two groups to which both belong.

An example of such a grid type network system is the system shown in FIG. 6 of the following document. Reference: IEEE INFOCOM ”1992, 9B.
3.1-9B. 3.10, "Virtual Topo
logs for WDM Star LANs-
The Regular Structures Ap
Proach ”.

FIG. 2 is a block diagram of the lattice type network system shown in this document. In this FIG.
As a node connection method, a method of connecting all the nodes with one star coupler is adopted. In other words, a method is adopted in which the transmission wavelengths of all the nodes are wavelength-multiplexed (or frequency-multiplexed) with one star coupler.

Therefore, in this system, a method of allocating different wavelengths to all coordinates is adopted as a method of allocating the packet transmission wavelength (or packet transmission frequency).

Further, in the above system, as a packet addressing method (method for defining a packet destination), a method of transmitting each packet at a wavelength corresponding to the destination is adopted. Therefore, as a method of allocating the packet transmission wavelength, a method of further allocating a plurality of wavelengths to each coordinate is adopted.

[0008]

However, in the wavelength division multiplexing network, in order to perform communication between nodes,
It is necessary that the transmission wavelength and the reception wavelength always match, and the conventional system has the following problems.

(1) That is, in order to output a transmission signal, each node must select the transmission wavelength corresponding to the destination node from a plurality of wavelengths that the node can transmit and transmit it. Therefore, a plurality of highly accurate laser diodes or wavelength tunable lasers are required. Therefore, there is a big problem that the hardware configuration of the transmission unit of each node becomes complicated.

(2) Also, since the combination of the output wavelengths is different for each node, the hardware configuration of the transmission signal output section is individual for each node. Therefore, the node configuration cannot be made uniform, which is not suitable for mass production.

(3) Further, when considering a grid of N rows × N columns, the wavelength multiplicity is 2 (N-1) N ² . This requires 2 × (N−1) transmitters and receivers for each node. As a result, there is a problem that the hardware configuration amount of the reception unit of each node increases when the scale of the system is increased.

From the above, there is a demand for providing an inter-node connecting device, a node device and a lattice type network system which can suppress an increase in the hardware amount of the system even if the number of nodes increases. .

[0013]

SUMMARY OF THE INVENTION Therefore, according to the present invention, an internode connecting device for connecting a plurality of node devices to transmit a signal between the plurality of node devices has the following characteristic configuration. To solve the problem.

That is, conversion means for allocating the transmission signals output from each node device to several groups and converting the transmission signals of each group into different signals within the group,
The transmission signal converted by the conversion means is signal-multiplexed for each group, and the signal distribution means for distributing the multiplexed signal of each group to the node devices belonging to each group.

[0015]

According to the present invention, the conversion means converts the transmission signal into a different signal for each group, and converts the signals so that the signals do not overlap in the same group.

This group corresponds to, for example, a row group or a column group. The number of groups is determined by the number of nodes in the network system.

The converting means converts the transmission signal into a signal having a different frequency when converting the signal into a different signal within a group, or a signal having a different power,
Various methods such as conversion to signals with different phases, conversion to signals with different modulation modes, conversion to signals with different amplitudes, conversion to signals with different polarizations, etc. can be used. be able to.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described with reference to the drawings. Therefore, in this embodiment, in the lattice type network system, "node connection means" for forming a packet transmission path, specifically, "signal distribution means" and "frequency conversion means", It is composed of "frequency multiplexing means" and "signal distribution means".

The signal distribution means may be a packet transmission signal output from the packet transmission unit of each node (the transmission frequency of this transmission signal does not have to be specified in particular, and may be anything. Not required) is assigned to each group.

Next, the frequency conversion means has a function of converting the packet signals of each group distributed by the signal distribution means into a specific frequency.

The frequency multiplexing means has a function of frequency multiplexing the transmission signal whose frequency is converted by the frequency converting means.

Further, the signal distributing means has a function of distributing the frequency-multiplexed signals of each group outputted from the frequency-multiplexing means to a plurality of nodes belonging to this group.

In such a configuration, the transmission signals output from the plurality of nodes are frequency-multiplexed for each group by the signal distribution means, the frequency conversion means, and the frequency multiplexing means. This frequency-multiplexed signal is distributed to the nodes belonging to the corresponding group by the signal distribution means.

With such a configuration, this allocation can be freely performed as long as the requirement to allocate different packet transmission frequencies to each group is satisfied.
This makes it possible to perform allocation such that the same packet transmission frequency is used for all row groups and the same packet transmission frequency is used for all column groups.

Therefore, the frequency multiplicity can be reduced, and the device can be made to have the same configuration on the row side and the column side. Therefore, even when the system is scaled up, the amount of hardware increases. It can be realized by simply preparing two sets of the same configuration on the row side and the column side. Here, the amount of hardware is one transmitter and 2N receivers.

"Logical Arrangement of Nodes": FIG. 3 is a logical arrangement of nodes. In FIG. 3, the nodes 100 _{1 to} 100 ₉ are arranged in a grid pattern of N rows × M columns. Here, N and M are both integers of 2 or more. That is, in FIG. 3, they are arranged in a 3 × 3 grid pattern.

A plurality of nodes 100 arranged in this lattice form
_{1-100 9,} are grouped for each row and each column. In the case of this example, three row groups RG1 to RG3
Are divided into three column groups CG1 to CG3.

Further, between any two nodes 100 belonging to the same group, the packet is transferred in one hop by the configuration described later. Similarly, between any two nodes 100 belonging to different groups, the two
2 via node 100 located at the intersection of two groups
Packets are forwarded at hops.

[Node Connection Configuration]: FIG. 1 is a network configuration diagram of an embodiment. It should be noted that FIG. 1 is for the network in the lattice state of 3 rows × 3 columns in FIG. That is, FIG. 1 shows a connection configuration of the nodes 100 _{1 to} 100 ₉ .

In this embodiment, all the nodes 100 ₁ ...
One optical transmission path 100 ₉ is configured to be shared. However, the optical transmission line is formed independently on the row side and the column side. Therefore, the optical transmission line of this embodiment comprises the optical transmission line on the row side and the optical transmission line on the column side.

The network system shown in FIG. 1 has a row-side node connection device 20 forming an optical transmission line on the row side.
0, and the column side node connection device 3 forming the optical transmission line on the column side
00 is also provided.

The row-side node connection device 200 frequency-multiplexes the transmission signals output from rt of the _nine nodes 100 _{1 to} 100 ₉ for each row group, and the frequency-multiplexed signal is divided into three nodes belonging to the row group. It is configured to distribute to 100.

Similarly, the column-side node connection device 300 frequency-multiplexes the transmission signals output from ct of the nine nodes 100 for each column group, and the frequency-multiplexed signal is divided into three nodes 100 belonging to the column group. Is configured to be distributed to.

The row-side node connection device 200 shown in FIG.
Are two optical switches 201 and 214, nine frequency conversion devices 202 to 210, and three star couplers 211.
˜213. Here, the optical switch 2
01 has a function of distributing the transmission signals output from the rt of the _nine nodes 100 _{1 to} 100 ₉ to each row group. Further, the frequency conversion devices 202 to 210
Is a set of three, and the first set is 202 (output wavelength λ
1), 203 (output wavelength λ2), 204 (output wavelength λ
3). The second set is 205 (output wavelength λ1), 206
(Output wavelength λ2) and 207 (output wavelength λ3). The third set is 208 (output wavelength λ1) and 209 (output wavelength λ1).
2) and 210 (output wavelength λ3).

The above-mentioned combination is used, and the frequency conversion function is provided so that frequencies belonging to the same row group do not overlap.

Further, each of the optical couplers 211 to 213 has a function of frequency multiplexing the three transmission signals of the corresponding row group. Furthermore, the optical switch 214 at the latter stage has a function of distributing the frequency-multiplexed signal of each row group to the three nodes 100 belonging to the corresponding row group.

The column-side node connection device 300 is also composed of two optical switches 310 and 314, nine frequency conversion devices 302 to 310, and three optical couplers 311 to 313. Here, the optical switch 301 has a function of distributing the transmission signals output from ct of the _nine nodes 100 _{1 to} 100 ₉ to each column group.

Further, the frequency converters 302 to 310 are
As one set of three, the first set is 302 (output wavelength λ1),
303 (output wavelength λ2) and 304 (output wavelength λ3). The second set is 305 (output wavelength λ1), 306 (output wavelength λ2), and 307 (output wavelength λ3). 3rd set is 3
08 (output wavelength λ1), 309 (output wavelength λ2), 31
0 (output wavelength λ3).

Furthermore, it has a frequency conversion function so that frequencies belonging to the same column group do not overlap. Further, each of the optical couplers 311 to 313 has a function of frequency-multiplexing the three transmission signals of the corresponding column group. Further, the optical switch 314 in the latter stage has a function of distributing to the three nodes 100 belonging to each column group.

The above is the schematic configuration of each node connection device 200, 300. Here, the connection configuration in these node connection devices 200 and 300 will be described by taking the row-side node connection device 200 as a representative.

Optical switch 2 of row-side node connection device 200
01 has nine input terminals i1 to i9 and nine output terminals o1 to o9. Each input terminal i1~i9 is connected to the line-side transmission terminal rt the corresponding nodes ₁₀₀ 1 to 100 _9.

In FIG. 1, nine output terminals o1 to o9 are provided.
Are divided into three groups of three in accordance with the grouping of the nodes 100 _{1 to} 100 ₉ . Here, the output terminals o1 to o3 correspond to the row group RG1, the output terminals o4 to o6 correspond to the row group RG2, and the output terminal o.
7 to o9 correspond to the row group RG3.

In such a configuration, the optical switch 20
1 corresponds each input terminal in to the corresponding output terminal om (m = 1, m = 1, in accordance with the grouping of the nodes 100 _{1 to} 100 ₉ ).
2, ...).

When the input terminal i1 to which the node 100 ₁ is connected is connected, it is connected to any one of the three output terminals corresponding to the row group to which the node 100 ₁ belongs. For example, when the node group to which this node 100 belongs is RG1, it is connected to any one of the three output terminals o1 to o3 corresponding to this RG1, for example, the output terminal o1. The optical switch 20
1 indicates the input terminals i1 to i1 according to the change of the network.
The connection destination of i9 is configured to be changeable.

The frequency converters 202 to 204 are respectively connected to the three output terminals o1 to o3 corresponding to the row group RG1 of the optical switch 201. In such a configuration, the frequency converters 202 to 204 frequency-multiplex information signals by the star coupler 211 described later, so that the frequency converters do not have signals having the same frequency in the same group, for example, RG1. 202-2
Reference numeral 04 frequency-converts and outputs the information signals of frequencies λ1 to λ3.

Frequency converters 205 to 207 and 2
08 to 210 also output information signals of frequencies λ1 to λ3, respectively. The star coupler 211 has three input terminals i1.
To i3 and three output terminals o1 to o3. An optical switch 2 is connected to each input terminal in through a frequency conversion device.
Of the nine output terminals o1 to o9 of 01, three output terminals corresponding to the row group, for example, o1 to o3 corresponding to the row group RG1 are connected, respectively.

In such a configuration, the star coupler 2
Reference numeral 11 is for frequency-multiplexing the information signals input to the three input terminals i1 to i3 and distributing them to the three output terminals o1 to o3.

The star couplers 212 and 213 are also provided with three input terminals i1 to i3 and three output terminals o1 to o3, respectively.
o3 and three input signals are frequency-multiplexed and distributed to the output terminals o1 to o3.

The optical switch 214 has nine input terminals i1.
To i9 and nine output terminals o1 to o9. Here, the input terminals i1 to i3 are connected to the output terminals o1 to o3 of the star coupler 211, and the input terminals i7 to i9 are connected to the output terminals o1 to o3 of the star coupler 213. On the other hand, the output terminal o1~o9 are respectively connected to the nine nodes ₁₀₀ 1 to 100 ₉ line-side receiving terminal rr.

In such a configuration, for example, the optical switch 214 has three input terminals i1 to i3 corresponding to the row group RG1 respectively and row side receiving terminals rr of the nodes 100 having node numbers 1 to 3 belonging to this group RG1. And three input terminals i corresponding to the row group RG2.
4 to i6 are connected to the row side receiving terminals rr of the nodes 100 having the node numbers 4 to 6 belonging to the group RG2, respectively, and the three input terminals i7 to i7 corresponding to the row group RG3 are connected.
i9 is connected to the row-side receiving terminals rr of the nodes 100 having node numbers 7 to 9 belonging to this group RG3.

The optical switches 201 and 214 are constructed so that the connection destinations of the input terminals i1 to i9 can be changed according to the reconfiguration of the network.

"Internal Configuration of Nodes 100 _{1 to} 100 ₉ ": FIG. 4 is a diagram showing the internal functional configuration of the nodes 100 _{1 to} 100 ₉ of the embodiment. In FIG. 4, the node 10
0 is mainly a packet processing unit 101, a column side transmission laser diode 110, a row side reception coupler 111, fixed filters 112 to 114, 122 to 124, and optical / electrical converters 115 to 117, 125 to 127. , A row side transmission laser diode 120 and a column side reception coupler 121.

The packet processing unit 101 is for performing generation of a transmission packet, reception of a reception packet and relaying. The column-side transmission laser diode 110 converts the electric transmission signal output from the packet processing unit 101 into an optical signal. The transmission signal output from the column side transmission laser diode 110 is given to the column side transmission terminal ct. The output frequency of the column-side transmission laser diode 110 does not need to be specified in particular, and can be freely determined at each node. Further, the frequency accuracy does not need to be so high. Here, for example, λ0 is set.

The row side transmission laser diode 120 converts the electric transmission signal output from the packet processing unit 101 into an optical signal. The transmission signal output from the row-side transmission laser diode 120 is given to the row-side transmission terminal rt. The output frequency of the row-side transmission laser diode 120 does not need to be specified in particular, and can be freely determined at each node. Further, the frequency accuracy does not need to be so high. Here, for example, λ0 is set.

The row-side receiving coupler 111 has a row-side receiving terminal rr.
It distributes the received signal supplied to the. The fixed filters 112 to 114 select the optical signals of wavelengths λ1 to λ3 from the optical signals distributed by the row-side receiving coupler 111. The column-side reception coupler 121 distributes the reception signal supplied to the column-side reception terminal cr. The fixed filters 122 to 124 are for selecting optical signals of wavelengths λ1 to λ3 from the optical signals distributed by the column side reception coupler 121.

The optical / electrical converters 115 to 117 convert the optical signals selected by the corresponding fixed filters 112 to 114 into electric signals. By this conversion, the optical signal is converted into an electric signal and supplied to the packet processing unit 101. Further, the optical / electrical converter 125-1
27 is a corresponding fixed filter 122-124, respectively.
The optical signal selected by is converted into an electric signal. By this conversion, the optical signal is converted into an electric signal,
It is supplied to the packet processing unit 101.

"Packet addressing method":
Next, FIG. 5 is a packet format diagram of the embodiment. In FIG. 5, the address of the packet is addressed by inserting the address of the source node and the address of the destination node in the header of the packet.

"System Operation": FIG. 6 is an explanatory diagram of the operation of the network of FIG. In FIG. 6,
In particular, the operation of the node connecting devices 200 and 300 will be described. In FIG. 1 described above, each node 100 _1-
Per 100 ₉ of the row-side transmission, after being distributed to each line group by the transmission signal the optical switch 201 to be outputted from the row side transmission terminal rt, the corresponding frequency converter 2
After 02-210, the frequency is multiplexed by the star couplers 211-213. This frequency-multiplexed signal is distributed by the optical switch 214 to the row-side receiving terminal rr of the node 100 belonging to its own group.

Similarly, the column side receiving terminal ct of each node 100
The transmission signal output from the optical switch 301 is distributed to each column group by the optical switch 301, and then passes through the corresponding frequency converters 302 to 310, and then the star couplers 311 to 31 1.
3 is frequency-multiplexed. This frequency multiplexed signal is
The optical switch 314 distributes the signal to the column-side reception terminals cr of the nodes 100 belonging to the own group.

FIG. 6 shows the optical switches 201 and 2 in this case.
It shows the connection state of 14, 301, and 314.
The logical arrangement of the nodes is the same as that shown in FIG.
Further, in FIG. 6, the connection state regarding the row group RG1 and the column group CG1 is shown as an example.

In this case, the input terminal i of the optical switch 214 is
1 to i3 are connected to the output terminals o1 to o3. As a result, the row group R output from the star coupler 211
The frequency multiplexed signal of G1 is distributed to the row side reception terminals rr of the nodes 100 having node numbers 1 to 3 belonging to this group RG1.

Similarly, the input terminal i of the optical switch 301 is
1, i4, i7 are connected to the output terminals o1 to o3.
As a result, the star coupler 311 frequency-multiplexes the output transmission signals from the column-side output terminals ct of the node numbers 1, 4, and 7 belonging to the column group CG1.

Further, the input terminals i1 to i1 of the optical switch 314 are
i3 is connected to output terminals o1, o4, and o7. As a result, the frequency-multiplexed signal of the column group CG1 output from the star coupler 302 is distributed to the column-side reception terminals cr of the nodes 100 of the node numbers 1, 4, and 7 belonging to this group CG1.

[Operation of Node 100]: FIG. 7 is an explanatory diagram of packet transfer according to the embodiment. (Packet Transmission Operation) In FIG. 7, when a packet is transmitted to another node included in the column group to which the node belongs (arrow (1) in FIG. 7), the transmission output from the packet processing unit 101 in FIG. The signal is supplied to the laser diode 110 on the column side. On the other hand, when transmitting a packet to another node included in the row group to which the node belongs (arrow (1) in FIG. 7), this transmission signal is supplied to the laser diode 120 on the row side in FIG. . Such "packet transfer is called one-hop transfer".

Next, when the packet is transmitted to another node which is not included in the row group or column group to which the node belongs (arrows (3) and (4) in FIG. 7), the packet processing unit 10
The transmission signal output from 1 is supplied to either the column side transmission laser diode 110 or the row side transmission laser diode 120. Transferring a packet to another node other than the row / column group to which the own node belongs is called "two-hop transfer".

The transmission signal supplied to the column side transmission laser diode 110 or the row side transmission laser diode 120 is
It is supplied from the column side transmission terminal ct or the row side transmission terminal rt to the column side node connection device 300 or the row side node connection device 200. As a result, this transmission signal is frequency-multiplexed with the transmission signal output from another node included in the column group or row group to which the own node belongs. The above is the packet transmission operation.

(Packet reception operation): The frequency-multiplexed signal supplied from the row-side node connection device 200 to the row-side reception terminal rr is distributed to the fixed filters 112 to 114 by the row-side reception coupler 111 in FIG. by this,
The frequency-multiplexed signal is separated into signals of wavelengths λ1 to λ3.

Now, when the own node (for example, the row side transmission terminal rt of node number 1) is connected to the frequency conversion device 202 via the optical switch 201, it is the packet transmission wavelength of the frequency conversion device 202 or λ1. , Fixed filter 11
The signal of wavelength λ1 separated by 2 is the signal transmitted from the own node. On the other hand, the fixed filter 1
The signals of wavelengths λ2 and λ3 separated by 13, 114 are signals transmitted from other nodes.

These signals are supplied to the packet processing unit 101 after being converted into electric signals by the optical / electrical converters 115 to 117, respectively. This packet processing unit 1
In 01, it is determined whether the received packet is addressed to the own node or to another node included in the column group to which the own node belongs, based on the destination address included in the header part of the received packet.

When the received packet is addressed to its own node, it is stored in the reception buffer (not shown). On the other hand, when it is addressed to another node, the column side transmission laser diode 1
Supplied to 10. As a result, this received packet is transmitted to other nodes included in the column group to which the own node belongs. The above is the packet receiving operation.

"Network Reconfiguration": Next, network reconfiguration will be described. This reconfiguration of the network is performed by changing the logical arrangement of the nodes 100. In this embodiment, the node connection device 2
00, 300 optical switches 201, 214, 301, 3
This is done by switching the connection state of 14.

FIG. 8 is an explanatory diagram of the reconfiguration of the network system of the embodiment. In FIG. 8, node number 1
The position of the node 100 and the position of the node 100 having the node number 4 are exchanged. In this case, the node change occurs in the row groups RG1 and RG2 and the column group CG1.
Is. Among these, in the column group CG1, the node position within the group is changed, but the node connection configuration is not changed. On the other hand, in the row groups RG1 and RG2,
The node connection configuration is changed.

In this embodiment, as described above, the communication within the group is carried out by broadcasting. Therefore, when the node position in the group is changed but the node connection configuration is not changed, the optical switches 201, 214, 301, 3
There is no need to change the connection state of 14. Therefore, in this case, only the connections relating to the row groups RG1 and RG2 are switched.

FIG. 9 shows the node connection devices 200 and 3 of the embodiment.
It is operation | movement explanatory drawing (the 2) of 00. The switching is performed by the optical switches 201 and 214 as shown in FIG.
Connection destination of node 100 with node number 1 and node number 2
It is sufficient to exchange the connection destination of the node 100 of FIG. That is, the input terminal i1 of the optical switches 201 and 214 is connected to the output terminal o4.
And the input terminal i4 may be the output terminal o1.

As a result, the transmission signals output from the row side transmission terminals rt of the nodes 100 having node numbers 4, 2, and 3 are frequency-multiplexed and distributed to these row side reception terminals rt. Further, the transmission signals output from the row-side transmission terminals rt of the nodes 100 having node numbers 1, 5, and 6 are frequency-multiplexed and distributed to these row-side reception terminals ct. As described above, the positions of the nodes 100 having the node numbers 1 and 4 have been exchanged.

"Network Reconfiguration When Adding Nodes": Next, FIG. 10 is a diagram for explaining network reconfiguration when adding nodes according to the embodiment. In FIG. 10, a case where the network is reconfigured to add the node 100 will be described. It is now assumed that a 3 × 3 network is configured in a maximum of 5 rows × 5 columns network.

In this state, one node 100 is added. In this case, if the node 100 is added while maintaining the 3 × 3 network, the added node can only send and receive packets in one direction.

Therefore, in this case, it is better to reconfigure the network and the number of nodes is 10.
As shown in 0, it is preferable to configure a 5 × 2 network. As a result, the extension node can also send and receive packets in two directions.

Next, FIG. 11 is a diagram for explaining the reconfiguration of the network when the faulty node of the embodiment is removed. In the maximum 5 × 5 network shown in FIG.
1 shows a case where a 3 × 3 network of 1 is configured and one node 100 in the network fails.
In this case, 8 nodes 100 excluding the faulty node are 2
The x4 network may be reconfigured.

(Effects of the Embodiment) According to the lattice type network system of the above embodiments, the transmission frequency can be assigned to each node in the same manner, and the node configuration can be unified.

Further, the transmission signals output from a plurality of nodes are frequency-multiplexed (= wavelength-multiplexed) for each group, and this frequency (wavelength) multiplexed signal is distributed to the nodes belonging to the corresponding group. The frequency multiplicity (= wavelength multiplicity) can be greatly improved as compared with the conventional case.

Furthermore, the above-mentioned effect makes it possible to suppress an increase in the amount of hardware that accompanies an increase in the size of a node.

Other Embodiments: (1) In the above embodiments, the case where the lattice type network system is applied to the optical communication system has been described. Can also be applied.

(2) Further, since the node connection device of the present invention frequency-multiplexes the signals output from the respective nodes and distributes the signals to the respective nodes, it also receives signals other than signals destined to the own node. be able to. That is, by performing some processing on the receiving side, the transfer can be performed in a broadcast manner. Therefore, it can be applied to a network including video transfer such as CATV.

(3) Further, the node connecting device of the present invention is applied not only to a network system for transmitting digital signals but also to a network system for transmitting analog signals or a network system for transmitting both digital signals and analog signals. can do.

(4) Furthermore, in addition to the frequency conversion means, for example, signals of different powers, signals of different phases, signals of different modulation modes, different amplitudes, etc. It is effective when applied as a method for avoiding duplication within a group, whichever is the target, such as conversion to a signal of, or conversion to a signal of different polarization.

(5) In addition to frequency multiplexing, for example,
It is also effective to apply time division multiplexing, space division multiplexing, code division multiplexing, or the like.

(6) Furthermore, the row-side node connection device 2 described above
00 and the column-side node connection device 300 can also be applied as an optical switching device.

(7) Further, in addition to the laser diode, a light emitting diode or the like can be applied.

[0090]

As described above, according to the present invention, the conversion means for distributing the transmission signals output from each node device into several groups and converting the transmission signals of each group into different signals within the group. And the signal distribution means for signal-multiplexing the transmission signals converted by this conversion means for each group and distributing the multiplexed signals of each group to the node devices belonging to each group. It is possible to realize an inter-node connection device, a node device, and a lattice type network system that suppresses an increase in the amount of system hardware even with the increase in the number of nodes.

[Brief description of drawings]

FIG. 1 is a network configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional lattice type network system.

FIG. 3 is a logical array configuration diagram of nodes according to the embodiment.

FIG. 4 is a diagram showing the internal functional configuration of a node according to the embodiment.

FIG. 5 is a packet format diagram of the embodiment.

FIG. 6 is an operation explanatory diagram (1) of the network of FIG. 1 of the embodiment.

FIG. 7 is an explanatory diagram of packet transfer according to the embodiment.

FIG. 8 is an explanatory diagram of reconfiguration of the network system according to the embodiment.

FIG. 9 is an explanatory diagram (No. 2) of the operation of the node connecting device according to the embodiment.

FIG. 10 is a diagram for explaining the reconfiguration of the network in the case of adding nodes according to the embodiment.

FIG. 11 is a diagram for explaining the reconfiguration of the network when the failed node of the embodiment is removed.

[Explanation of symbols]

100 ... node, 200 ... row side node connection device, 20
1, 214, 301, 314 ... Optical switch, 202-2
10, 302-310 ... Frequency conversion device, 211-21
3, 311 to 313 ... Star coupler, 300 ... Column side node connecting device.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04Q 3/52 B 9566-5G

Claims (5)

[Claims] 1. In an inter-node connection device for connecting a plurality of node devices to transmit a signal between the plurality of node devices, a transmission signal output from each node device is distributed to several groups, Conversion means for converting the transmission signals of the groups into different signals within the group, and the transmission signals converted by this conversion means are signal-multiplexed for each group, and the multiplexed signals of each group are applied to the node devices belonging to each group. An inter-node connection device comprising a signal distribution means for distributing a signal. 2. The conversion means converts the transmission signal into a signal having a different frequency within a group, a signal having a different power, and a signal having a different phase,
2. The inter-node connection device according to claim 1, wherein the inter-node connection device is any one of conversion into signals of different modulation modes, conversion into signals of different amplitudes, and conversion into signals of different polarizations. 3. The signal multiplexing of the signal distributing means is any one of frequency multiplexing, time division multiplexing, space division multiplexing and code division multiplexing.
The internode connection device described. 4. A column group demultiplexing means for demultiplexing from a multiplexed signal given from a node device of a column group, a row group demultiplexing means for demultiplexing from a multiplexed signal given from a node device of a row group, A column group demultiplexing means and a switching means for performing exchange processing from demultiplexed signals obtained by demultiplexing with the row group demultiplexing means, and performing signal transmission to other node devices of the column group or row group as necessary. A node device characterized by being provided. 5. A system comprising the inter-node connection device according to claim 1 and the node device according to claim 4, wherein a plurality of node devices arranged in a grid form each row and each A lattice type network system characterized by transmitting signals between a plurality of node devices, which are grouped for each column.