JP2000253040A - Connector and network connection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily connect networks with different protocols. SOLUTION: A network connection system is provided with a slave set UM 14 connected to an Ethernet (R) 12 and a master set CM 15 connected to an asynchronous transfer mode ATM network 16. The UM 14 has a LAN adaptor section 35 that extracts data transmitted through the Ethernet 12, a base band section 37 and a radio section 38 that transmit the data through a radio channel. The CM 15 is provided with a radio section 31 and a base band section 32 that receive data sent through a radio channel, a control section 33 that converts the received data into the data format of the ATM network and an ATM adaptor section 34 that outputs the converted data to the ATM network 16 according to the protocol of the ATM network 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection device and a network connection system used for connecting networks, and more particularly to a connection device and a network connection system for connecting networks having different protocols.

[0002]

2. Description of the Related Art Conventionally, in the office, one personal computer is assigned to each person, and each personal computer is connected to an L
It is connected to an AN (local area network). recent years,
L that uses an asynchronous transfer mode (ATM) is capable of transmitting a large amount of data and handling multimedia in an integrated manner.
AN (ATM-LAN) is gradually spreading. Then, this ATM-LAN is connected to an L such as an existing Ethernet.
It is being introduced in place of AN.

[0003] As described above, the existing LAN is connected to the ATM-LA.
When shifting to N, for example, it is necessary to change the transmission medium such as changing a twisted pair cable to an optical fiber cable, and a large-scale wiring work is required,
The problem that the initial investment cost is large arises. Therefore, in practice, when migrating to ATM-LAN, all existing LAN systems are not replaced,
ATM-LAN is gradually introduced while existing terminals (for example, personal computers), applications, and the like are made available. For example, existing L such as Ethernet
LAN emulation is known as a technique for using AN applications in ATM networks, and the ATM Forum in the United States established a de facto standard in 1995.

[0004] Here, the functional components of LAN emulation include a LAN emulation client (LEC) as a client for executing communication on the ATM network and an existing medium access control (MAC) address of the LAN. A LAN emulation server (LES) for executing an address resolution protocol for converting addresses, and a broadcast unknown server (BU) for performing broadcast communication on an ATM network.
S) and a LAN emulation configuration server (LECS) that manages the configuration of an ATM network such as LES and BUS. For details of these functions, see, for example, ATM Forum Series 2
It is described in LAN Emulation Specification 1.0 (issued by the Telegraph and Telephone Technical Committee).

FIG. 1 is a diagram showing a configuration of a network system incorporating a conventional LAN emulation. In this network system, a plurality of terminals 102 that communicate according to the Ethernet protocol and a LAN switch 103 that enables communication between the Ethernet and the ATM network are connected by the Ethernet 101. The LAN switch 103 has an LEC function of the LAN emulation described above. LA
The N switch 103 sends an ATM-LAN 105 to an ATM switch 104 for exchanging data between ATM networks.
Connected by The ATM switch 104 is provided with the LAN emulation LES, LECS, and B
Has US function. The ATM switch 104 is an ATM terminal 106 that performs data communication according to the ATM protocol.
Are connected by an ATM-LAN 105. Also,
The ATM switch 104 is an ATM-WAN (wide area network).
(ork) 107 and the like.

FIG. 2 is a diagram showing a protocol structure of the LAN switch 103. The LAN switch 103 has a physical layer 111 for Ethernet and a MAC layer 112 on the Ethernet 101 side in order from the lower layer.
On the AN 105 side, the physical layer 113 for the ATM in order from the lower layer.
, ATM layer 114 and AAL (ATM adaptation layer
r) has five layers 115, and further has a MAC layer 112 and AA
A LANE (LAN emulation) layer 116 is provided between the LANE layer 115 and the L5 layer 115.

[0007]

SUMMARY OF THE INVENTION As described above, LA
When using N emulation, the existing LAN
It is necessary to perform wiring work to connect the ATM and the LAN to the ATM-LAN via a LAN switch, which causes a problem of high cost. In addition, since such wiring work is required, there has been a problem that it is not possible to easily and quickly cope with a layout change or the like in an office.

Therefore, an object of the present invention is to provide a connection device and a network connection system which can solve the above-mentioned problems. This object is achieved by a combination of features described in the independent claims. The dependent claims define further advantageous embodiments of the present invention.

[0009]

To achieve the above object, a connection device according to a first embodiment of the present invention is connected to a first network for performing data communication according to a first protocol, and is connected to the first network. A connection device for transmitting data from a network to a second network that performs data communication according to a second protocol different from the first protocol, the data acquisition unit extracting data on the first network, It is characterized by having a data conversion unit for converting to a data format according to the above, and a wireless transmission unit for wirelessly transmitting data.

A connection device according to a second aspect of the present invention is connected to a first network for performing data communication according to a first protocol, and performs data communication according to a second protocol different from the first protocol. A connection device for receiving data from a second network side, a wireless receiving unit for receiving data wirelessly transmitted from the second network side, and converting the received data to data in a format according to a first protocol. A data conversion unit for converting the converted data into a first
A data output unit for outputting to the first network according to a protocol.

[0011] The first network is a wired Ethernet, the second network is a network using a wired asynchronous transfer mode, and the data converter is configured to send a destination medium access control address in Ethernet frame data. A virtual path identifier and a virtual channel identifier for the destination in the second network, and convert the data in the frame format for the first network into the cell format data for the asynchronous transfer mode including the virtual path identifier and the virtual channel identifier. May be converted.

The first network is a network using a wired asynchronous transfer mode, the second network is a wired Ethernet, and the data converter is constructed by assembling a plurality of cell data for the first network. The data may be converted into frame format data for the second network.

To achieve the above object, a network connection system according to a first aspect of the present invention comprises a first network for performing data communication according to a first protocol, and a first network.
A network connection system that enables data communication with a second network that performs data communication according to a second protocol different from the first protocol, comprising: a first connection device connected to the first network; And a second connection device connected to the first connection device, the first connection device has a data acquisition unit that retrieves data flowing through the first network, and a wireless transmission unit that wirelessly transmits data,
A second connection device configured to receive the wirelessly transmitted data; a data conversion unit configured to convert the received data into a data format according to the second protocol; A data output unit for outputting to a network.

In order to achieve the above object, a network connection system according to a second aspect of the present invention employs a first network for performing data communication according to a first protocol and a second network different from the first protocol. A network connection system that enables data communication with a second network that performs data communication, comprising: a first connection device connected to a first network; and a second connection device connected to a second network. A first data acquisition unit that retrieves the data on the first network; a data conversion unit that converts received data into a data format according to a second protocol; A wireless transmission unit that performs wireless transmission, wherein the second connection device includes:
The wireless communication device includes a wireless receiving unit that receives wirelessly transmitted data, and a data output unit that outputs the received data to a second network according to a second protocol.

[0015] The first network is a wired Ethernet, the second network is a network using a wired asynchronous transfer mode, and the data converter is connected to a destination medium access control address in Ethernet frame format data. A virtual path identifier and a virtual channel identifier for the destination in the second network, and convert the data in the frame format for the first network into the cell format data for the asynchronous transfer mode including the virtual path identifier and the virtual channel identifier. May be converted.

The first network is a network using a wired asynchronous transfer mode, the second network is a wired Ethernet, and the data converter is constructed by assembling a plurality of cell data for the first network. The data may be converted into frame format data for the second network. Note that the above summary of the present invention does not list all of the necessary features of the present invention, and a sub-combination of these features may also be an invention.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described through embodiments of the present invention. However, the following embodiments do not limit the invention according to the claims, and have the features described in the embodiments. Not all combinations are essential to the solution of the invention.

FIG. 3 is a diagram showing a configuration of a network system including a network connection system according to an embodiment of the present invention. In this network system, a plurality of terminals 1 that communicate according to the Ethernet protocol
1 and a UM (user module: slave unit) 14 as an example of a connection device of the network connection system 13 are connected by the Ethernet 12. Also, a CM (control module: master unit) as an example of a connection device of the network connection system 13 that performs wireless communication with the UM 14
Reference numeral 15 is connected to an ATM switch 17 via an ATM network 16 such as an ATM-LAN. AT
The M exchange 17 is provided with LAN emulation LES, L
It has ECS and BUS functions. ATM switch 17
Is connected to an ATM network 18 such as an ATM-WAN.

FIG. 4 is a diagram showing a configuration of an Ethernet frame, a radio frame, and an ATM cell according to the first embodiment of the present invention. An Ethernet frame used in the Ethernet 12 has a destination MA as shown in FIG.
It has a C address section, a source MAC address section, a data length section, and a data section. The Ethernet frame includes a field for storing an error correction code and the like other than the above, but illustration and description are omitted here.
The destination MAC address field is a field for storing the MAC address of the destination terminal or the like. The source MAC address is a field for storing the MAC address of the source terminal or the like. The data length part is a field for storing information indicating the length of the data part of the Ethernet frame. The data section is a field for storing data to be transmitted.

The radio frame for the radio line is shown in FIG.
Has one B channel, four C channels, and one U channel. B channel is CM
15 is a channel for storing broadcast information to be transmitted to the UM 14. The broadcast information includes allocation information indicating to which UM 14 the U channel has been allocated in response to a request from a plurality of UMs 14, and whether the frame is a radio frame from the UM 14 to the CM 15, or a radio frame from the CM 15 to the UM 14. And the like. The C channel is a channel for storing control information for requesting data transmission or the like from the UM 14 to the CM 15. In the present embodiment, a plurality of C channels (four in the figure) are provided, and each C channel is allocated to each of the plurality of UMs 14 so that control information from each UM 14 does not collide. . The U channel is a channel for storing data to be transmitted wirelessly. In the present embodiment, an Ethernet frame is stored in the U channel.

AT for ATM networks 16, 18, etc.
The M cell has a 5-byte ATM as shown in FIG.
It has a header and a 48-byte information field. A
The TM header is a field for storing a virtual path identifier (VPI) and a virtual channel identifier (VCI), which are connection information to the destination. The information field is a field for storing data to be transmitted.

FIG. 5 is a block diagram showing a U-type antenna according to the first embodiment of the present invention.
It is a figure showing the protocol structure of M14 and CM15.
The UM 14 is arranged on the Ethernet 12 side in order from the lower layer.
It has a physical layer 21 and a MAC layer 22, and on the radio line side,
In order from the lower layer, the wireless physical layer 23 and the wireless MAC layer 24
And a wireless DLC layer 25, and a relay layer 26 above the MAC layer 22 and the wireless DLC layer 25.

The CM 15 includes a wireless physical layer 23, a wireless MAC layer 24, a wireless DL
ATM-LAN 1 having a C layer 25 and a MAC layer 22
The physical layer 27, the ATM layer 28, and the
And the AAL5 layer 29, and further, the MAC layer 22 and A
The LANE layer 30 is provided in a layer above the AL5 layer 29.

The physical layer 21 encodes the Ethernet frame received from the upper layer and transmits the encoded Ethernet frame to the Ethernet 12. The physical layer 21 receives the encoded Ethernet frame from the Ethernet 12, decodes the Ethernet frame, and decodes the Ethernet frame. And a function of delivering the layers. MA
Upon receiving the decoded bit sequence of the Ethernet frame from the lower layer, the C layer 22 decomposes the bit sequence into frames, deletes the control information, and passes only the data to be transmitted to the upper layer. It has a function of assembling an Ethernet frame by adding control information such as a destination MAC address and a source MAC address to data to be transmitted passed from the layer, and delivering the Ethernet frame as a bit string to a lower layer.

The radio physical layer 23 modulates and converts the radio frame received from the upper layer and transmits the radio frame by radio. The radio physical layer 23 receives the radio frame transmitted by radio, demodulates the radio frame, demodulates the received radio frame, and demodulates the radio frame. And a function to deliver the information to Wireless MAC
When the layer 24 receives the bit string of the decoded radio frame from the lower layer, the layer 24 decomposes the bit string, deletes the control information, extracts the Ethernet frame, and passes the Ethernet frame to the upper layer. A function of assembling a wireless frame by adding control information for a wireless line to an Ethernet frame to be transmitted passed from the layer of the wireless layer and delivering the wireless frame as a bit string to a lower layer, and a function of performing error correction on the wireless frame And The wireless DLC layer 25 performs access control of a wireless line. Specifically, the wireless DLC layer 25 has a function of performing retransmission control and order guarantee on a wireless line for a wireless frame received from a lower layer or a wireless frame received from an upper layer. The relay layer 26 includes the MAC layer 22 and the wireless D
It has a function of relaying data with the LC layer 25.

The physical layer 27 has a function of encoding data received from an upper layer and transmitting the encoded data to the ATM network 16 and a function of receiving encoded ATM cells from the ATM network 16 and decoding the ATM cells. And a function of delivering the same to the layer of The ATM layer 28 has a function of adding and deleting an ATM header of an ATM cell. AAL5
The layer 29 divides the data received from the upper layer into the size of the information field of the ATM cell and transfers it to the lower layer, and restores the information field of the ATM cell received from the lower layer to the original data. And a function to deliver to an upper layer. The LANE layer 30 includes a VPI and a VC for specifying a transmission path of a transmission destination of the ATM network based on a transmission destination MAC address of data received from the MAC layer 22.
It has a function of determining I, a function of adding an LE header for storing an identification number of a transmission source LEC to an Ethernet frame, and a function of deleting the LE header from data received from a lower layer.

FIG. 6 is a view showing a C-type power supply according to the first embodiment of the present invention.
It is a figure showing the composition of M15. The CM 15 includes a wireless unit 31 and a baseband unit 32 as an example of a “wireless transmitting unit” and a “wireless receiving unit”, a control unit 33 as an example of a “data converting unit”, a “data acquiring unit” and a “data And an ATM corresponding unit 34 as an example of the “output unit”. The wireless unit 31 mainly performs the function of the wireless physical layer 23. For example, the wireless unit 31 has a function of modulating and frequency converting a wireless frame transmitted to the UM 14 and wirelessly transmitting the same, and a function of receiving a wireless frame wirelessly transmitted from the UM 14 and demodulating the same.

The baseband unit 32 mainly includes the wireless MAC layer 2
Execute the function of No. 4. For example, the baseband unit 32
When the radio unit 31 receives the decoded bit sequence of the received radio frame, the radio unit 31 decomposes the bit sequence, deletes the radio control information, and passes it to the control unit 33.
A function to assemble a wireless frame by adding control information for a wireless line, an error correction code, and the like to an Ethernet frame to be transmitted passed from the wireless communication apparatus, and to deliver the wireless frame to the wireless unit 31 as a bit string; And a function of correcting an error of the obtained radio frame.

The control unit 33 mainly includes the radio DLC layer 25 and the MA
The functions of the C layer 22 and the LANE layer 30 are executed. Specifically, the control unit 33 has a function of controlling the wireless unit 31 and the baseband unit 32 in the wireless line to perform retransmission control and order guarantee. Further, the control unit 33 has a function of extracting an Ethernet frame from the wireless frame received from the baseband unit 32 and a function of restoring the Ethernet frame by removing the LE header from the data received from the ATM corresponding unit 34. The control unit 33
Has a function of determining a VPI and a VCI for specifying a transmission path of a transmission destination of an ATM network based on a transmission destination MAC address in an Ethernet frame.

In the present embodiment, VPI and VCI can be determined as follows. For example, L of the ATM switch 17
The destination MAC address is transmitted to the ES to inquire and obtain the ATM address of the transmission destination, and the relevant ATM is acquired.
The VPI and VCI can be determined by establishing a connection with the destination by the address. Also, A
The LEC of the destination using the BUS function of the TM exchange 17
, The VPI and VCI can be determined by establishing a connection with the BUS.

The ATM corresponding unit 34 mainly includes the physical layer 27 and the AT.
The functions of the M layer 28 and the AAL5 layer 29 are executed. Specifically, the ATM corresponding unit 34 has a function of encoding an ATM cell and transmitting the encoded ATM cell to the ATM network 16, and receives the encoded ATM cell from the ATM network 16,
The function of decoding the ATM cell, the function of adding and deleting the ATM header, the function of dividing the transmission target data into the size of the information field of the ATM cell, and the function of dividing the information field of the ATM cell received from the ATM network 16 It has a function of assembling, restoring to original data, and delivering it to the control unit 33.

FIG. 7 is a circuit diagram of a C according to the first embodiment of the present invention.
FIG. 3 is a diagram illustrating an example of a configuration of a wireless unit 31 of M15. At the time of wireless transmission, the I signal (in-phase component signal) and the Q signal (quadrature component signal) received from the baseband unit 32 in the wireless unit 31 are modulated by the modulation unit 31A, and are mixed via the switch 31D. 31J. A signal generated by the crystal oscillation unit 31F and the PLL synthesizer 31E is input to the modulation unit 31A via the switch 31B. The mixer 31J includes a crystal oscillator 31F,
The signal input through the PLL synthesizer 31E, the multiplier 31G, the band-pass filter 31H, and the amplifier 31I is mixed with the signal input from the modulation unit 31A. The signal mixed by the mixer 31J is supplied to a band-pass filter 31K, a switch 31L, a microwave IC 31
M, 31N, switch 31O, bandpass filter 31
R, and wirelessly transmitted via the antenna 31S.

At the time of radio reception, the signal received by the antenna 31S in the radio section 31 is divided into a band-pass filter 31R, a switch 31O, a microwave IC 3
1P, 31Q, switch 31L, bandpass filter 3
The signal is input to a demodulator (detector) 31C via 1K, a mixer 31J, and a switch 31D. In the demodulator 31C,
The signal is demodulated into an I signal and a Q signal, and the I signal and the Q signal are demodulated.
The signal is input to the baseband unit 32.

FIG. 8 is a circuit diagram of a C according to the first embodiment of the present invention.
FIG. 3 is a diagram illustrating an example of a configuration of a baseband unit 32 of M15. At the time of wireless transmission, in the baseband unit 32, data to be transmitted from the control unit 33 received by the bus arbitration unit 32 </ b> A is transmitted to the parallel-serial conversion unit 3.
It is converted to serial data by 2C, and CRC (cyclic red)
undancy check) CRC code is added by the encoder 32D, and the FEC (forward error correction) encoder 3
An error correction code is attached in 2E, encrypted in a scramble unit 32H, pre-ampled in a preamble synchronization addition unit 32I, converted into a parallel signal in a serial / parallel conversion unit 32J, and converted into a parallel signal in a quaternary sum difference operation unit 32K. It is converted into an I signal and a Q signal.

In the FEC encoder 32E, a correction code detected by the error correction unit 32F is added. In the scramble unit 32H, encryption is performed based on the pattern set by the scramble pattern setting unit 32G. The bus arbitration unit 32A and the parallel / serial conversion unit 32C operate based on the control of the transmission control unit 32B.

At the time of wireless reception, the baseband unit 32
In the above, the I signal and the Q signal input from the radio unit 31 are subjected to delay detection by the delay detection unit 32L, converted to serial signals by the parallel-serial conversion unit 32M, and temporarily stored as data in the buffer unit 32N. Is done. Then, the data stored in the buffer unit 32N is decrypted by the descrambling unit 320, and the FEC decoder unit 3
The error correction is performed in 2S, the accuracy of the data is checked by the CRC check unit 32U, and the serial / parallel conversion unit 32
The signal is converted into a parallel signal by V and input to the control unit 33 via the bus arbitration unit 32A.

In the FEC encoder 32S, error correction is performed based on the error data detected by the error correction unit 32T and the corrected data. In the scramble unit 320, encryption is performed based on the pattern set by the scramble pattern setting unit 32P. Also,
Bus arbitration unit 33A and serial-parallel conversion unit 32V
Operates under the control of the reception control unit 32W that operates based on the synchronization information detected by the synchronization detection unit 32R. The buffer unit 32N outputs the stored data based on the synchronization information detected by the synchronization detection unit 32R.

FIG. 9 is a view showing a C-type power supply according to the first embodiment of the present invention.
FIG. 3 is a diagram illustrating an example of a configuration of a control unit 33 and an ATM corresponding unit 34 of M15. The control unit 33 includes a CPU (central proc).
essor unit) 33A and RAM (random access memor)
y) 33B and FLASH ROM (read only memor)
y) It has 33C and DPRAM (dual port RAM) 33D, and each part is connected by a bus 34E. CPU33
A realizes the function of the control unit 33 by executing the program. FLASH ROM33C
The program to be executed by the CPU 33A is stored. RA
M33B stores data and the like necessary during execution of the program. The DPRAM 33D stores transmission target data and received data. The DPRAM 33D has two input / output ports, and can input / output via the bus 34E and can input / output data to / from the baseband unit 32.

The ATM corresponding part 34 is an AAL5 terminal part 34.
A and the network termination controller 34
B, opto-electric signal converter 34C, and electro-optical converter 34D
And The AAL5 terminating unit 34A is connected to the bus 33E and the network termination controller 34B. The AAL5 terminating unit 34A divides the data to be transmitted into the size of the information field of the ATM cell, and transfers it to the network termination controller 34B. The AAL5 terminating unit 34A receives the ATM received from the network termination controller 34B.
The information field of the cell is restored to the original data to be transmitted and delivered to the CPU 33A or the like. As the AAL5 terminal portion 34A, for example, A8686 of Fujitsu Limited
There is a TM adaptation controller.

The network termination controller 34B encodes the data received from the AAL5 terminator 34A and passes it to the electro-optical converter 34D. The network termination controller 34B receives the encoded data from the electro-optical converter 34C and decodes the data. And a function of delivering the data to the AAL5 termination unit 34A. As the network termination controller 34B, for example, an MB manufactured by Fujitsu Limited
86683 network termination controller. The photoelectric converter 34C converts the electric signal received from the network termination controller 34B into an optical signal and transmits the optical signal to the ATM network 16 using an optical fiber as a transmission path. The electro-optical converter 34D converts an optical signal received from the ATM network 16 using an optical fiber as a transmission line into an electric signal and passes the electric signal to the network termination controller 34B.

FIG. 10 is a diagram showing a configuration of the UM 14 according to the first embodiment of the present invention. The UM 14 includes a LAN correspondence unit 35 as an example of a “data acquisition unit” and a “data output unit”, a control unit 36, a baseband unit 37 as an example of a “wireless reception unit” and a “wireless transmission unit”, and a wireless communication unit. And a portion 38. The wireless unit 38 has the same configuration as the wireless unit 31 described above. The baseband unit 37 has the same configuration as the baseband unit 32 described above. The control unit 36 mainly performs the functions of the wireless DLC layer 25, the MAC layer 22, and the relay layer 26. Specifically, the control unit 36
Has a function of controlling the radio unit 38 and the baseband unit 37 to perform retransmission control and order guarantee on a radio line.
Further, the control unit 36 has a function of passing the Ethernet frame received from the LAN correspondence unit 35 to the baseband unit 37 and a function of passing the Ethernet frame received via the baseband unit 37 to the LAN correspondence unit 35.

The LAN correspondence unit 35 has a function of encoding the Ethernet frame received from the control unit 36 and transmitting the Ethernet frame to the Ethernet 12, and a function of receiving the encoded Ethernet frame from the Ethernet 12, decoding the Ethernet frame, and decoding the Ethernet frame. 36, and a function of delivering the information to the user.

FIG. 11 is a diagram showing an example of the configuration of the control unit 36 and the LAN corresponding unit 35 of the UM 14 according to the first embodiment of the present invention. The control unit 36 includes a CPU 36A and R
AM36B, FLASH ROM36C, DPRA
M36D and PCI (peripheral component interconn
ect) a bus bridge 36F, and each part is a bus 36E.
Connected by The CPU 36A implements the functions of the control unit 36 by executing a program. F
The LASH ROM 36C stores a program to be executed by the CPU 36A. The RAM 36B stores data and the like necessary during execution of the program. DPRAM36D
Stores transmission target data and received data.
The DPRAM 36D has two input / output ports,
While data can be input and output via the bus 36E,
Data can be input and output to and from the baseband unit 37.
The PCI bus bridge 36F is further connected to a PCI bus 36G, and transfers data between the bus 36E and the PCI bus 36G.

The LAN corresponding section 35 has a LAN interface 35A and an RJ45 connector 35B. L
The AN interface 35A has a function of encoding the data received from the control unit 36 and passing it to the RJ45 connector 35B, and a function of receiving the encoded data from the RJ45 connector 35B, decoding the data, and decoding the data.
6 has the function of delivering the information to the user. RJ45 connector 35B
Connects the Ethernet 12 and the LAN interface 35A.

FIG. 12 is a flowchart of the data transmission process of the UM 14 according to the first embodiment of the present invention. L
When the AN corresponding unit 35 receives an Ethernet frame from the Ethernet 12 (step S01), it decodes the encoded Ethernet frame and delivers it to the control unit 36. The control unit 36 delivers the Ethernet frame to the baseband unit 37. The baseband unit 37 converts the received Ethernet frame into a wireless frame and delivers the wireless frame to the wireless unit 38. The wireless unit 38 wirelessly transmits the wireless frame (step S02).

FIG. 13 is a flowchart of the data receiving process of the CM 15 according to the first embodiment of the present invention. U
The radio frame transmitted from the radio unit 38 of M14 is C
The signal is modulated by the wireless unit 31 of M15 and passed to the baseband unit 32. When the baseband unit 32 receives the radio frame (step S03), the synchronization of the radio frame is established, and the radio frame is transmitted to the DP of the control unit 33.
Write to the RAM 33D. Next, the control unit 33 sets the DPR
An Ethernet frame is extracted from the U channel of the wireless frame stored in the AM33D (step S04),
The destination MAC address is obtained from the Ethernet frame, and the VPI / VCI of the route to the destination is determined based on the destination MAC address (step S05).

Further, the control unit 33 adds an LE header to the Ethernet frame. Then, the ATM corresponding unit 34 decomposes the Ethernet frame to which the LE data has been added, stores it in the information fields of the plurality of ATM cells (step S06), and stores the determined VPI / VCI in the ATM header of each ATM cell. (Step S07).
Then, the ATM corresponding unit 34 transmits each ATM cell to the ATM network 16 (Step S08). As a result, the data to be transmitted is transmitted to the destination on the ATM network 16.

FIG. 14 is a flowchart of the data transmission process of the CM 15 according to the first embodiment of the present invention. A
When the TM corresponding unit 34 receives an ATM cell from the ATM network 16 (step S09), an Ethernet frame to which an LE header is added is assembled by combining information fields of the received plurality of ATM cells (step S10). . Next, the control unit 33
Removes the LE header and restores the Ethernet frame (step S11), and writes the Ethernet frame into the DPRAM 33D as the U channel of the wireless frame (step S12). The baseband unit 32 has a DP
The wireless frame is extracted from the RAM 33D, added with an error correction code, etc., and delivered to the wireless unit 31. Radio unit 3
1 wirelessly transmits the wireless frame (step S1).
3).

FIG. 15 is a flowchart of the data receiving process of the UM 14 according to the first embodiment of the present invention. C
The radio frame transmitted from the radio unit 31 of M15 is U
The signal is modulated by the radio section 38 of M14 and passed to the baseband section 37. When the baseband unit 37 receives the radio frame (step S14), the synchronization of the radio frame is established, and the radio frame is transmitted to the D of the control unit 36.
Write to PRAM 36D. Next, the control unit 36 sets the DP
An Ethernet frame is extracted from the U channel of the wireless frame stored in the RAM 36D (step S1).
5) Deliver to the LAN corresponding unit 35. Next, the LAN corresponding unit 35 converts the Ethernet frame into the Ethernet 1
2 (step S16). As a result, the data to be transmitted is transmitted to the destination on the Ethernet 12.

As described above, data can be transmitted and received between the Ethernet 12 and the ATM network 16. Also, the UM connected to the Ethernet 12
14 and a CM connected to the ATM network 16
15 transmits and receives data via a wireless line, so that there is no need to consider wiring for connecting the Ethernet 12 and the ATM network 16. Therefore, it is possible to easily and quickly cope with a change in the layout in the office.

Next, a network system according to a second embodiment of the present invention will be described. This network system has the same overall configuration as the network system according to the first embodiment shown in FIG.
15 have different functions. Hereinafter, among the components in the UM 14 and the CM 15,
The same components as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 16 is a diagram showing a configuration of a radio frame according to the second embodiment of the present invention.

C. The radio frame for the radio line is
It has one B channel, four C channels, and four U channels. The B channel is transmitted from CM15 to UM1.
4 is a channel for storing broadcast information to be transmitted to the fourth channel. The broadcast information includes allocation information indicating to which UM 14 the U channel has been allocated in response to requests from a plurality of UMs 14, and a radio frame from the UM 14 to the CM 15, or a radio frame from the CM 15 to the UM 14. There is direction information or the like indicating whether or not.

The C channel is a channel for storing control information for requesting data transmission and the like from the UM 14 to the CM 15. In the present embodiment, a plurality of C channels (four in the figure) are provided, and each C channel has a plurality of UM1s.
4 so that the control information from each UM 14 does not collide. The U channel is a channel for storing data to be transmitted. In the present embodiment, ATM cells are stored in each of the U channels.

FIG. 17 is a view for explaining the protocol structure of the UM 14 and the CM 15 according to the second embodiment of the present invention. The UM 14 has a physical layer 21 and a MAC layer 22 on the Ethernet 12 side in order from the lower layer, and a wireless physical layer 23 and a wireless MAC layer on the wireless line side in order from the lower layer.
Layer 24, wireless DLC layer 25, ATM layer 28, AA
It has an L5 layer, and further has a LANE layer 30 above the MAC layer 22 and the AAL5 layer 29.

The CM 15 includes a wireless physical layer 23, a wireless MAC layer 24, a wireless DL
A physical layer 27 and an ATM layer 28 on the ATM-LAN 16 side in order from the lower layer. Further, a relay layer is provided above the wireless DLC layer 25 and the ATM layer 28. 31
Having. The relay layer 31 includes a wireless DLC layer 25 and an ATM.
It has a function of relaying data with the layer 28.

FIG. 18 is a diagram for explaining the configuration of the CM 15 according to the second embodiment of the present invention. The CM 15 is a wireless unit 3 as an example of a “wireless receiving unit” and a “wireless transmitting unit”.
1 and a baseband unit 32, a control unit 41, and an ATM corresponding unit 4 as a "data acquisition unit" and a "data output unit"
And 2. The wireless unit 31 mainly performs the function of the wireless physical layer 23. The baseband unit 32 mainly includes the wireless MAC layer 2
Execute the function of No. 4. The control unit 41 mainly includes the wireless DLC layer 2
5 and the function of the relay layer 31 are executed. ATM corresponding part 42
Performs mainly the functions of the physical layer 27 and the ATM layer 28.

FIG. 19 is a diagram for explaining the configuration of the UM 14 according to the second embodiment of the present invention. The UM 14 is a LA as an example of a “data acquisition unit” and a “data output unit”.
An N corresponding unit 35, an ATM corresponding unit 44, a control unit 43 as an example of a “data conversion unit”, a baseband unit 37 and a wireless unit 38 as an example of a “wireless transmitting unit” and a “wireless receiving unit” Having. The ATM corresponding unit 44 mainly includes an AT
Perform the functions of the M layer 28 and the AAL5 layer. Control unit 43
Is mainly composed of the wireless DLC layer 25, the MAC layer 22, and the LAN
The function of the E layer 30 is executed.

FIG. 20 is a flowchart of the data transmission process of the UM 14 according to the second embodiment of the present invention. L
When the AN corresponding unit 35 receives the Ethernet frame from the Ethernet 12 (step S21), the AN corresponding unit decodes the encoded Ethernet frame and transfers it to the control unit 43. The control unit 43 acquires the destination MAC address from the Ethernet frame, and determines the VPI / VCI of the route to the destination based on the destination MAC address (Step S22). Next, the control unit 43 adds an LE header to the Ethernet frame. And ATM
The corresponding unit 44 decomposes the Ethernet frame to which the LE data has been added, stores it in the information fields of a plurality of ATM cells (step S23), and stores the determined VPI / VCI in the ATM header of each ATM cell (step S23). S24). Then, the control unit 43 uses the ATM cell as a U channel of a radio frame in a DPRAM (not shown).
(Step S25). Next, the baseband unit 37 takes out the radio frame from the DPRAM, performs addition of an error correction code, etc., and delivers it to the radio unit 38. The wireless unit 38 modulates the wireless frame and transmits the wireless frame wirelessly (step S26).

FIG. 21 is a flowchart of the data receiving process of the CM 15 according to the second embodiment of the present invention. U
The radio frame transmitted from the radio unit 38 of M14 is C
The signal is modulated by the radio section 31 of M15 and passed to the baseband section 32. When the baseband unit 32 receives the wireless frame (step S27), the baseband unit 32 establishes synchronization of the wireless frame and writes the wireless frame into a DPRAM (not shown) of the control unit 41. Next, the control unit 41 takes out the ATM cell from the DPRAM and delivers it to the ATM corresponding unit 42 (Step S).
28). The ATM corresponding unit 42 transmits each ATM cell to the ATM network 16 (Step S29). As a result, the data to be transmitted is transmitted to the destination on the ATM network 16.

FIG. 22 is a flowchart of a data transmission process of the CM 15 according to the second embodiment of the present invention. A
When the TM corresponding unit 42 receives an ATM cell from the ATM network 16 (step S30), the ATM
The cell is passed to the control unit 41. The control unit 41 uses the ATM cell as the U channel of the radio frame,
Writing to the RAM (step S31). The baseband unit 32 extracts a wireless frame from the DPRAM, performs addition of an error correction code, and delivers the wireless frame to the wireless unit 31. The wireless unit 31 modulates the wireless frame and transmits the wireless frame wirelessly (step S32).

FIG. 23 is a flowchart of the data receiving process of the UM 14 according to the second embodiment of the present invention. C
The radio frame transmitted from the radio unit 31 of M15 is U
The signal is modulated by the radio section 38 of M14 and passed to the baseband section 37. When the baseband unit 37 receives the radio frame (step S33), the synchronization of the radio frame is established, and the radio frame is transmitted to the D of the control unit 43.
Write to PRAM. Next, the control unit 43
The ATM cell is extracted from the U channel of the wireless frame stored in the ATM cell (step S34) and delivered to the ATM corresponding unit 44.

Next, the ATM responding section 44 transmits a plurality of ATMs.
LE by combining cell information fields
An Ethernet frame to which a header has been added is assembled (step S35). Next, the control unit 33 removes the LE header and restores the Ethernet frame (step S36), and delivers the Ethernet frame to the LAN corresponding unit 35. Then LA
The Ethernet frame received by the N corresponding unit 35 is transmitted to the Ethernet 12 (step S37). As a result, the data to be transmitted is transmitted to the destination on the Ethernet 12.

As described above, data can be transmitted and received between the Ethernet 12 and the ATM network 16. Also, the UM connected to the Ethernet 12
14 and a CM connected to the ATM network 16
15 transmits and receives data via a wireless line, so that there is no need to consider wiring for connecting the Ethernet 12 and the ATM network 16. Therefore, it is possible to easily and quickly cope with a change in the layout in the office.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above embodiment, LES, BUS, LECS
Although the UM or CM of the network connection system may have at least one function of LES, BUS, and LECS. In the above embodiment, the connection device and the network connection system for connecting the Ethernet 12 and the ATM network 16 have been described. However, the present invention is not limited to this, and any connection device and network connection system for connecting networks of different protocols. The present invention can be applied if the invention is applied.

Although the present invention has been described with reference to the embodiment, the technical scope of the present invention is not limited to the scope described in the above embodiment. It is apparent to those skilled in the art that various changes or improvements can be added to the above embodiment. It is apparent from the description of the appended claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

[0067]

As is apparent from the above description, according to the present invention, networks with different protocols can be easily connected, and when an office layout is changed, etc., it is possible to respond easily and quickly. .

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a network system incorporating a conventional LAN emulation.

FIG. 2 is a diagram showing a protocol structure of a conventional LAN switch.

FIG. 3 is a diagram illustrating a configuration of a network system including a network connection system according to an embodiment of the present invention.

FIG. 4 is a diagram showing configurations of an Ethernet frame, a radio frame, and an ATM cell according to the first embodiment of the present invention.

FIG. 5 shows a UM and a CM according to the first embodiment of the present invention.
FIG. 3 is a diagram showing a protocol structure of FIG.

FIG. 6 is a diagram illustrating a configuration of a CM according to the first embodiment of the present invention.

FIG. 7 is a diagram illustrating an example of a configuration of a wireless unit of the CM according to the first embodiment of the present invention.

FIG. 8 is a diagram illustrating an example of a configuration of a baseband unit of a CM according to the first embodiment of the present invention.

FIG. 9 is a diagram illustrating an example of a configuration of a control unit and an ATM corresponding unit of the CM according to the first embodiment of the present invention.

FIG. 10 is a diagram showing a configuration of a UM according to the first embodiment of the present invention. It is.

FIG. 11 is a diagram illustrating an example of a configuration of a UM control unit and a LAN corresponding unit according to the first embodiment of the present invention.

FIG. 12 is a flowchart of a UM data transmission process according to the first embodiment of the present invention.

FIG. 13 is a flowchart of a CM data reception process according to the first embodiment of the present invention.

FIG. 14 is a flowchart of a CM data transmission process according to the first embodiment of the present invention.

FIG. 15 is a flowchart of a UM data reception process according to the first embodiment of the present invention.

FIG. 16 is a diagram illustrating a configuration of a radio frame according to the second embodiment of the present invention.

FIG. 17 shows UM and C according to the second embodiment of the present invention.
FIG. 3 is a diagram illustrating the protocol structure of M.

FIG. 18 is a diagram illustrating a configuration of a CM according to a second embodiment of the present invention.

FIG. 19 is a diagram illustrating a configuration of a UM according to a second embodiment of the present invention.

FIG. 20 is a flowchart of a UM data transmission process according to the second embodiment of the present invention.

FIG. 21 is a flowchart of a CM data reception process according to the second embodiment of the present invention.

FIG. 22 is a flowchart of a CM data transmission process according to the second embodiment of the present invention.

FIG. 23 is a flowchart of a UM data reception process according to the second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Terminal 12 Ethernet 13 Network connection system 14 UM 15 CM 16 ATM-LAN 17 ATM exchange 18 ATM-WAN 31, 38 Radio | wireless part 32, 37 Baseband part 33, 36, 38, 41, 43 Control part 34, 42, 44 ATM compatible part 35 LAN compatible part

Continued on front page F-term (reference) 5K030 GA08 HA10 HB18 HC15 HD06 JL01 KA05 KA13 LB13 5K033 AA09 CA08 CB02 CB08 DA05 DA17 DB01 DB19 5K034 AA20 DD03 EE03 FF13 HH04 HH07 HH16 HH18 HH61 KK27 NN04 KK27 NN04 KK27 NN04 9

Claims (8)

[Claims] 1. A first network connected to a first network that performs data communication according to a first protocol, and transmits data from the first network to a second network that performs data communication according to a second protocol different from the first protocol. A data acquisition unit that retrieves the data on a first network; a data conversion unit that converts the data into a data format according to the second protocol; and a wireless transmission unit that wirelessly transmits the data. A connection device comprising: 2. A connection device connected to a first network for performing data communication according to a first protocol and receiving data from a second network side for performing data communication according to a second protocol different from the first protocol. A wireless receiving unit that receives the data wirelessly transmitted from the second network side; a data converting unit that converts the received data into data in a format according to the first protocol; and the converted data. And a data output unit for outputting to the first network according to the first protocol. 3. The first network is a wired Ethernet network, the second network is a network using a wired asynchronous transfer mode, and the data conversion unit is a frame format for the Ethernet. Acquiring a virtual path identifier and a virtual channel identifier to the destination in the second network based on the medium access control address of the destination in the data;
3. The connection device according to claim 1, wherein the data in a frame format for a network is converted into data in a cell format for an asynchronous transfer mode including the virtual path identifier and the virtual channel identifier. 4. The first network is a network using a wired asynchronous transfer mode, and the second network is
The network is a wired Ethernet, and the data conversion unit assembles a plurality of cell format data for the first network to convert the data into frame format data for a second network. Item 3. The connection device according to item 1 or 2. 5. A data communication between a first network that performs data communication according to a first protocol and a second network that performs data communication according to a second protocol different from the first protocol is enabled. A network connection system, comprising: a first connection device connected to the first network; and a second connection device connected to the second network, wherein the first connection device flows through a first network. A data acquisition unit for retrieving data; a wireless transmission unit for wirelessly transmitting the data; the second connection device; a wireless reception unit for receiving wirelessly transmitted data; A data conversion unit that converts the data into a data format according to a protocol, and outputs the converted data to the second network according to the second protocol Network connection system characterized by having an that data output unit. 6. A data communication between a first network that performs data communication according to a first protocol and a second network that performs data communication according to a second protocol different from the first protocol is possible. A network connection system comprising: a first connection device connected to the first network; and a second connection device connected to the second network, wherein the first connection device is on a first network. A data acquisition unit for extracting the data, a data conversion unit for converting the received data into a data format according to the second protocol, and a wireless transmission unit for wirelessly transmitting the converted data. A second connection device configured to receive the wirelessly transmitted data; a second reception device configured to transmit the received data to the second communication device according to the second protocol;
A data output unit for outputting to a network. 7. The first network is a wired Ethernet network, the second network is a network using a wired asynchronous transfer mode, and the data conversion unit is the Ethernet frame format. Acquiring a virtual path identifier and a virtual channel identifier to the destination in the second network based on the medium access control address of the destination in the data;
7. The network connection system according to claim 5, wherein the data in a frame format for a network is converted into data in a cell format for an asynchronous transfer mode including the virtual path identifier and the virtual channel identifier. 8. The first network is a network using a wired asynchronous transfer mode, the second network is a wired Ethernet, and the data conversion unit includes a plurality of cells for the first network. 7. The network connection system according to claim 5, wherein the data is converted into frame format data for the second network by assembling the data in the format.