JPH02154549A - Network communication equipment - Google Patents

Abstract

PURPOSE:To utilize the performance of an optical fiber or the like capable of spatial multiplex sufficiently and to increase the communication capacity between terminal equipments by devising each terminal equipment provided in each station such that any of them can select freely the communication wavelength. CONSTITUTION:Each node (7a - 7n) is provided with a demultiplex/multiplex circuit 8 and a transfer control circuit 14 controlling an inter-memory transfer circuit 11, a common buffer memory 12 and a device connection interface 13. Upon the receipt of a service point number SAP and a communication data from each terminal equipment 5 provided in each station 1a - 1n, each station selects a designated wavelength among communication wavelengths lambda1 - lambdan, converts the communication data into a communication signal having the said wavelength by using the demultiplex/multiplex circuit 8 and each station sends the resulting signal to a designated terminal equipment 5 of a designated node. Moreover, upon the receipt of a communication signal, it is demodulated by the demultiplex/multiplex circuit 8 and fed to the designated terminal equipment 5. Thus, the performance of an optical fiber capable of spatial multiplexing is utilized sufficiently and the communication capacity between terminal equipments is considerably increased.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) TECHNICAL FIELD The present invention relates to network communication devices.

(Prior Art) In a network communication device that connects a plurality of terminals, each terminal is connected using a coaxial cable or the like, and data exchange between these terminals is supported.

(Problem to be solved by the invention) However, in such conventional network communication devices, the system is built on the premise of using a single communication medium such as a coaxial cable, There was a problem in that it was not possible to fully utilize the performance of optical fibers that could be spatially multiplexed.

In view of the above circumstances, it is an object of the present invention to provide a network communication device that can make full use of the performance of optical fibers capable of spatial multiplexing and dramatically increase the communication capacity between terminals. .

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, a network communication device according to the present invention is connected to a plurality of stations and supports data exchange between these stations. In the node, there is a communication wavelength selection section that selects a communication wavelength corresponding to the service point number output from the station connected to the own node, and a communication wavelength selected by this communication wavelength selection section is used to connect to the own node. A transmitting unit that converts communication data output from a station connected to a station into a communication signal and transmits it to a station connected to another node, and a station that demodulates communication signals supplied from other nodes and connects to the own node. The invention is characterized in that it is provided with a receiving section that supplies the information to the receiver.

(Operation) In the above configuration, when a service point number is output from the station connected to the own node, the communication wavelength selection unit selects the communication wavelength corresponding to this service point number. Then, when communication data is output from the station, the communication data is converted into a communication signal using the communication wavelength by a transmitter and transmitted to a station connected to another node.

Further, when a communication signal is supplied from another node, this communication signal is demodulated by the receiving section and supplied to the station connected to the own node.

(Embodiment) FIG. 1 is a block diagram showing an example of a network system using an embodiment of a network communication device according to the present invention.

The network system shown in this figure includes a plurality of stations 1a to 1n that make up the system, and a network communication device 2 that connects these stations 1a to 1n. Support processing.

Each station] a to 1n are each equipped with a plurality of terminal devices 5 used as man-machine interfaces with users, and the keyboards of the terminal devices 5 and the network communication device 2
When a processing command is input via the local station's memory (
It accesses the memory of another station (not shown) via the network communication device 2 (not shown) and executes the designated process. The processing results are then presented on the CRT of each terminal device 5 or output to other stations via the network communication device 2.

The network communication device 2 includes a network transmission path 6 constituted by an optical fiber communication line having a communication wavelength band of λ1 to λn, and a plurality of nodes 7a to 7n connected to required portions of the network transmission path 6. Each time data is output from each of the stations 1a to 1n connected to each of these nodes 7a to 7n, it is taken in and supplied to a designated station.

As shown in FIG. 2, the nodes 7a to 7n each include a branching/synthesizing circuit 8 connected to the network transmission line 6, and a plurality of serial/parallel converting circuits (S/ P conversion circuit) 9a to 9n and each of these S
A plurality of buffer memories 10a to Ion connected to the /P conversion circuits 9a to 9n, respectively, and each of these buffer memories 3
- an inter-memory transfer circuit connected to Oa to 1On] 1, a common buffer memory connected to this inter-memory transfer circuit 11] 2, a device connection interface 13 connected to this common buffer memory 12, and the memory A transfer control circuit 14 that controls an inter-transfer circuit 11 to a device connection interface 13 is provided.

Each of these nodes 7a to 7n is connected to each of the stations 1a.
When the service point number SAP and communication data are supplied from each terminal device 5 within ~1n, the communication wavelength λ]
~λn, the wavelength specified by the service point number SAP is selected, the communication data is converted into a communication signal of this wavelength, and this is transmitted to the specified node of the specified node via the network transmission path 6. It is transmitted to the terminal device 5. Further, when a communication signal is supplied via the network transmission line 6, it is taken in, demodulated, and supplied to the designated terminal device 5.

Next, the operation of this embodiment will be explained in detail with reference to FIGS. 3 and 4.

First, one of the plurality of terminal devices 5 in the stations 1a to 10, for example, the first terminal device 5 in the station 1-a, selects one of the service point numbers SAP1 to 5APn, for example, the service point number 5AP2, When the communication data is output, the device connection interface] 3 in the node 7a connected to the station 1a as shown in FIG. The number 5AP2 is supplied to the transfer control circuit 14.

As a result, the transfer control circuit 14 is transferred to the inter-memory transfer circuit 11.
to take in the communication data stored in the common buffer memory 12, transfer it to the buffer memory 10b corresponding to the service point number 5AP2, and connect the S/P conversion circuit 9b to the buffer memory 10b. is converted into a serial signal, and this conversion result is supplied to the second terminal of the demultiplexing/synthesizing circuit 8.

When the serial signal is supplied to the second terminal, the demultiplexing/synthesizing circuit 8 converts this serial signal into a communication signal of wavelength λ2, sends it onto the network transmission line 6, and transmits this communication signal. The data is transmitted to the designated terminal device 5 of the destination station included in the data.

Also, from another terminal device 5, the service point number SAP
]~5APn and communication data are output, the above-mentioned processing is executed to generate a communication signal with the communication wavelength specified by the value of the service point number SAP, and this is transmitted to the specified destination station. is transmitted to the terminal device 5 of.

Also, communication wavelengths λ1 to λ are transmitted via the network transmission path 6.
If a communication signal specifying its own node is supplied to any one of n, for example, the communication wavelength λ1, the branching/synthesizing circuit 8 of the node to which this communication signal is supplied, for example, the node 7a, takes it in, demodulates it, and then As shown in FIG. 4, the demodulation result is output from the first terminal corresponding to the communication wavelength λ1 of this communication signal and supplied to the S/P conversion circuit 9a, which converts it into parallel communication data. The data is supplied to the inter-memory transfer circuit]1 via the buffer memory 10a.

As a result, the inter-memory transfer circuit] takes in this communication data and writes it into the common buffer memory 12, and also supplies the transfer control circuit 14 with a signal indicating that a communication signal has been supplied at the communication wavelength λ1.

When the transfer control circuit 14 is supplied with this signal, it transfers the communication data stored in the area corresponding to the wavelength λ1 of the common buffer memory 12 to the device connection interface 13, and also controls the terminal of the device connection interface 13. Among them, the communication data is outputted from a terminal corresponding to the destination included in the communication data and supplied to the terminal device 5 connected to this terminal r-.

In addition, other communication wavelength λ2 is transmitted via the network transmission line 6.
When a communication signal is supplied by ~λn, the demultiplexing/synthesizing circuit 8 takes it in and demodulates it, and also outputs the second
This demodulation result is output from the terminal corresponding to the wavelength of this communication signal among the ~nth terminals.

Thereby, the demodulation result is transmitted to the S connected to this terminal.
/P conversion circuit and the buffer memory to the inter-memory transfer circuit 11, and after being stored in the common buffer 12 by this inter-memory transfer circuit 11, it is sent to the terminal device corresponding to the destination via the device connection interface 13. 5.

In this embodiment, the communication wavelengths λ1 to λn can be freely selected in any of the terminal devices 5 provided in each station]a to 1n, so that the network transmission path 6 The performance of the spatially multiplexable optical fibers that make up the system can be fully utilized.
Thereby, the communication capacity between each terminal device 5 can be dramatically increased.

Furthermore, in the embodiment described above, one service point number SAP is associated with one of the communication wavelengths λ1 to λn, but one service point number SAP is associated with one of the communication wavelengths λ1 to λn. It is also possible to dynamically select a communication wavelength that is not being used at that time. Thereby, the overall throughput of the network transmitting device 2 can be improved.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to fully utilize the performance of optical fibers capable of spatial multiplexing, and to dramatically increase the communication capacity between terminals.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a network system using an embodiment of a network communication device according to the present invention, FIG. 2 is a block diagram showing details of the notebook shown in FIG. 1, and FIG. 3 is a block diagram showing the same embodiment. FIG. 4 is a schematic diagram for explaining an example of the operation of the embodiment. 1a to 1n... Station 2... Network communication device 8... Transmitting section, receiving section (branching/synthesizing circuit) 14...
Communication wavelength selection section

Claims (1)

[Claims] (1) In a network communication device that is connected to multiple stations and supports data exchange between these stations, a node connected to each of the stations has a service point number that corresponds to the service point number output from the station connected to its own node. a communication wavelength selection unit that selects a communication wavelength selected by the communication wavelength selection unit; and a communication wavelength selection unit that converts communication data output from a station connected to its own node into a communication signal to be connected to another node using the communication wavelength selected by the communication wavelength selection unit. What is claimed is: 1. A network communication device comprising: a transmitting section that transmits a signal to a station connected to the local node; and a receiving section that demodulates a communication signal supplied from another node and supplies the demodulated communication signal to a station connected to the local node.