JPH07273802A - Inter-lan communication equipment, inter-lan communication transmitter and inter-lan communication receiver - Google Patents

Abstract

PURPOSE:To economically and efficiently perform inter-LAN communication by using a line exchange channel if a dead channel exists in the line exchange channel and using a packet exchange channel when the dead channel does not exist to perform communication and by using a line network and a packet exchange network. CONSTITUTION:In a step 1-3, whether a non-used line exchange channel exists or not is inspected. As a result, if the non-used line exchange channel exists, a treatment is shifted to the next step 1-4. If the non-used line exchange channel does not exist, the processing is shifted to a step 1-5. In the step 1-4, a channel for transmitting data to be transmitted at present is newly opened by using the line exchange channel and the communication of transmission data is performed by using this newly opened line exchange channel. In the step 1-5, the communication of transmission data is performed by using a packet exchange channel when a dead channel does not exist in the line exchange channel. Thus, the resources of communication is utilized and transmission efficiency can be raised.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-LAN communication device for connecting a plurality of local area networks (hereinafter referred to as LANs) to exchange data between a plurality of LANs and exchange messages.

[0002]

2. Description of the Related Art In recent years, with the progress of communication technology, many so-called LANs have been constructed and used for various communications. This LAN literally provides communication within a predetermined area, but as the number of LANs has increased, there has been a demand for sending messages and the like from one LAN to another LAN.

In order to satisfy such requirements, various so-called inter-LAN communication devices have been developed. As such an inter-LAN communication device, there is, for example, a device called a remote router or a remote bridge. These devices use a public line or a dedicated line to connect one LAN to another LAN.

Among these inter-LAN communication devices, there are many devices using the ISDN network. An example of a LAN-to-LAN network using the ISDN network is shown in FIG. As shown in FIG. 13, a plurality of bus networks can be connected to each other by an ISDN network. As shown in FIG. 13, a plurality of L
The AN can be connected to each other using a remote router and an ISDN network.

A configuration diagram of a general remote router is shown in FIG.
Is shown in. As shown in FIG. 14, the remote router is a LAN connected to the LAN cable.
A control unit 1 and a transfer data buffer 3 for storing data from or to the LAN control unit 1 are provided. Further, the transfer data buffer 3 is connected to a data processing unit 5 that processes data. Two types of exchange control units are connected to the data processing unit 5. That is, the packet switching control unit 7 and the line switching control unit 9 are connected to each other, and the packet switching channel and
It controls the circuit-switched channel. An ISDN control unit 11 is connected to the packet switching control unit 7 and the circuit switching control unit 9, and the final connection with the ISDN network is managed.

In addition, the remote router may be provided with a timer 13 for grasping time-outs, a circuit switching monitoring table 15, and a circuit switching channel usage right table 17. These tables are used when monitoring the usage status of the circuit switched channel of the ISDN network.

Generally, an ISDN network has two types of services, a circuit switching network and a packet switching network. For example, in the case of NTT INS-64 line, one contract has two B channels of 64 kbps and 16 kbp.
One s D channel can be used. The B channel is capable of circuit switching or packet switching, and the D channel is only capable of packet switching.

The features of such a circuit-switched channel will be described below. First, the advantages are as follows.

(A) The effective transmission rate is higher than that of the packet switching channel.

(B) When transmitting a large amount of data in a concentrated manner in a short time, the communication cost is lower than that of packet switching.

(C) Due to the large difference in perspective, short-distance communication costs are low.

As a disadvantage, (d) call connection time occurs.

(E) Call connection cannot be established when the own channel or the partner channel is in use.

(F) If the amount of transmission data during call connection is small, the communication cost is higher than that of packet switching.

The characteristics of the packet switching channel are as follows. First, the advantages are as follows.

(G) No call connection time is required.

(H) One channel can communicate with a plurality of parties at the same time.

(I) When a small amount of data is transmitted at time intervals, the communication cost is lower than that of the circuit switching channel.

(J) The long distance communication cost is low because the distance difference is small.

The disadvantages are as follows.

(K) The effective transmission rate is inferior to that of the circuit switching due to the delay in the network due to the storage and switching.

(L) When a large amount of data is transmitted in a short time, the communication cost is higher than that of the circuit switching channel.

(M) Since the difference in perspective is small, short-distance communication costs are high.

In many LAN-to-LAN communication devices using such an ISDN network, only a switching system of circuit switching or packet switching is used. Also,
In the LAN-to-LAN communication device that can use both exchange methods, the operation administrator selects which exchange method to use.
It must be specified in advance considering the frequency of use.

Which exchange method results in a cheaper communication cost depends on the communication distance and the generation status of communication data. In a very general usage situation, communication costs are low and circuit switching with high transmission speed is often used.

In addition, Japanese Patent Laid-Open No. 5-207070 discloses a structure in which the line is disconnected only when the waiting time exceeds a predetermined time and the communication time of a fixed charge unit is reached. Japanese Patent Application Laid-Open No. 5-153131 discloses a configuration in which the Maximum Transfer Unit is variably set by monitoring the data length of.

[0027]

When a plurality of LANs are connected by such an inter-LAN communication device, each LA is connected.
If the N-to-N communication device is provided with the circuit-switched channels corresponding to the number of destinations to be communicated, the cost of the device becomes large. In addition, the number of ISDN contract lines has increased,
As a result, there is a problem that the basic contract fee also increases.
For example, there are 20 LANs to connect, and each L
If communication is performed between ANs, each LAN
Each of the inter-LAN communication devices that are provided in the above and connect the corresponding LAN and ISDN must accommodate 19 circuit switching channels.

When the number of circuit switched channels is smaller than the number of destinations, or when transmission data to be sent to another destination occurs while using the circuit switched channels for communication,
Data transmission is delayed until the circuit switched channel becomes free.

On the other hand, when communication is performed by packet switching using the packet switching channel,
It is possible to communicate at the same time. However, since the effective communication speed is slower than that of the circuit switched channel, the communication cost is generally high as described above.

By the way, the charge for communication through the circuit-switched channel is different from the charge for the amount of data in the packet-switched channel and is charged for the communication time. Therefore, in the circuit switched channel, the call is disconnected when the communication is completed. However, if transmission data to be sent to the same destination occurs immediately after disconnecting the call, the connection process must be executed again, and a certain waiting time occurs before sending the data. Also, the destination L
There may be a case where there is no available channel in the AN communication device or there is no available channel in the own LAN communication device.

Further, the communication cost may be increased due to the disconnection of the call. This is because the circuit-switched channel is charged, for example, every 10 minutes for 10 yen. That is, if a call is generated for each data when the amount of data to be transmitted is small, a minimum charge (for example, 10 yen) is charged for each call, but a call is generated only once and a plurality of small charges are generated. If the transmission data are collectively sent within the minimum period (for example, 3 minutes), the data can be sent only with the minimum charge.

Further, in packet-switched channel communication, a charge is made for each packet that is communicated. Normally, the longer the packet size, the lower the communication unit price per byte. There is. However, it is difficult to configure so-called long packets having a large packet size, since the data received from the LAN by the inter-LAN communication device varies in size.
As a result, there is a problem that economic communication cannot be performed.

In addition to the data to be transmitted, data for network management is generally transmitted to the ordinary LAN. For example, RIP (Routin
Data called “gInformation Protocol” is a typical example. A small amount of such management data is generated at regular intervals, so
In a LAN-to-LAN communication device, if a circuit-switched channel is used only for this management data when other data does not occur, the line utilization efficiency becomes poor and the communication cost becomes expensive.

Furthermore, since the communication speed of the ISDN line or the dedicated line is generally slower than the communication speed on the LAN, L
When a large amount of data is generated as transmission data for the same destination on the AN, a large amount of transmission data is accumulated in the buffer in the LAN-to-LAN communication device. When it is sent to the communication device, the excess data is discarded. Here, the discarded data is subjected to data retransmission processing in a higher protocol (a terminal device on the own LAN and a terminal device on the destination LAN), but a transmission delay occurs. Undesirable effects will appear on the operation of the network. Moreover, in such a case, when the buffer is filled with the data of the same destination, even if there are a plurality of circuit-switched channels, the circuit other than the circuit-switched channel that is being used is in an unused state, resulting in waste.

The present invention has been made in order to solve these problems, and an object thereof is to make communication between LANs economically and efficiently by using a circuit switching network and a packet switching network. It is to provide an inter-LAN communication device that can be realized.

[0036]

The first aspect of the present invention is, in order to solve the above-mentioned problems, an inter-LAN communication device that connects a predetermined network to another network and enables communication between the networks. When the transmission data to be transmitted is generated, the channel use condition determining means for determining whether or not the destination of the transmission data is already communicating through the channel according to the first exchange method, and the first exchange method If the channel availability determination means for determining whether there is an available channel and the channel usage status determination means determine that communication is already being performed on the channel according to the first exchange method, the transmission is performed. In the first communication means for sending out data on the channel in which the communication is being performed, and in the channel availability determination means, the channel is vacant on the channel by the first exchange method. If it is determined that there is the
The second communication means for newly opening a channel by the first exchange system and transmitting the transmission data on the new channel, and the transmission data when the channel availability determination means determines that there is no availability And a third communication means for transmitting on a channel according to the second switching system,
The first exchange system and the second exchange system are inter-LAN communication devices characterized by different transmission rates.

In order to solve the above-mentioned problems, the second aspect of the present invention connects a predetermined network to another network,
In the inter-LAN communication device that enables communication between the networks, when transmission data to be transmitted is generated,
Channel usage status determining means for determining whether or not communication is already being performed on the destination of the transmitted data by the channel according to the first exchange method, and whether or not there is a free channel for the first exchange method If the channel availability determining means and the channel usage status determining means determine that communication is already being performed on the channel according to the first exchange method, the transmission data is transmitted on the channel on which the communication is being performed. When the first communication means for sending and the channel availability determination means determine that there is an available channel by the first exchange method, a new channel by the first exchange method is newly opened and the new The second communication means for transmitting the transmission data on the channel, and the transmission data when the channel availability determination means determines that there is no availability, Anda third communication means for transmitting the channel by second switching system, said a first exchange system, and said second switching system, LAN communication device characterized by charging method is different.

In order to solve the above-mentioned problems, a third aspect of the present invention is the LAN of the above-mentioned first aspect of the present invention or the second aspect of the present invention.
In the inter-communication device, the first switching system is a circuit switching system, and the second switching system is a packet switching system.

In order to solve the above-mentioned problems, the fourth aspect of the present invention connects a predetermined network with another network,
In a LAN-to-LAN communication device that enables communication between the networks, an end detecting unit that detects that communication performed on a channel according to a first exchange method has ended, and the end detecting unit includes the first exchange. When it is detected that the communication performed on the channel by the method has ended, the communication performed on the channel by the second exchange method is
A channel changing unit that newly uses a channel according to the first exchange method, and the first exchange method,
The second exchange method is an inter-LAN communication device having a different transmission rate.

In order to solve the above-mentioned problems, the fifth aspect of the present invention connects a predetermined network to another network,
In a LAN-to-LAN communication device that enables communication between the networks, an end detecting unit that detects that communication performed on a channel according to a first exchange method has ended, and the end detecting unit includes the first exchange. When it is detected that the communication performed on the channel by the method has ended, the communication performed on the channel by the second exchange method is
A channel changing unit that newly uses a channel according to the first exchange method, and the first exchange method,
The second exchange method is an inter-LAN communication device which is characterized by a different charging method.

A sixth aspect of the present invention, in order to solve the above problems, in the fourth or fifth inter-LAN communication device, the first switching system is a line switching system, and the second switching system is Is a packet switching system, and
It is an inter-AN communication device.

In order to solve the above-mentioned problems, the seventh aspect of the present invention connects a predetermined network with another network,
In a LAN-to-LAN communication device that enables communication between the networks, in order to perform communication using a channel according to a first switching system, a first calling means that performs a calling process and a channel using a second switching system are used. In order to perform communication, when the second calling means that performs the calling processing and the first calling means determine that they cannot connect to the communication partner even if the calling processing is performed. And a channel changing means for newly performing communication on the channel by the second switching method by using the second calling means.

In order to solve the above problems, an eighth aspect of the present invention is the inter-LAN communication device of the seventh aspect of the invention, wherein the first switching system is a line switching system and the second switching system is the second switching system. Is a packet switching system.
It is an N-to-N communication device.

In order to solve the above problems, a ninth aspect of the present invention is the inter-LAN communication device according to the seventh aspect of the present invention, wherein the first calling means performs communication even if the calling processing is performed a plurality of times. The inter-LAN communication device is characterized in that it is determined that the connection with the other party is impossible only when the connection with the other party is not possible.

In order to solve the above problems, the tenth aspect of the present invention connects a predetermined network to another network,
In a LAN-to-LAN communication device that enables communication between the networks, a disconnection condition setting unit that can set a disconnection condition of a call after the communication is completed for each communication destination address,
It is an inter-LAN communication device characterized by including.

The eleventh aspect of the present invention is, in order to solve the above-mentioned problems, in a LAN-to-LAN communication device which connects a predetermined network to another network and enables communication between the networks, after the communication is completed. The call disconnection condition of
Inter-LAN communication characterized by including disconnection condition setting means that can be set for each communication destination address, and call condition setting means that can set a call origination condition for each communication destination address It is a device.

In order to solve the above-mentioned problems, the twelfth aspect of the present invention provides the above-mentioned tenth or eleventh inter-LAN communication device,
The inter-LAN communication device, wherein the setting means sets, as the call disconnection condition, a length of time for which the channel is maintained after communication using the channel is not present, for each of the destination addresses. Is.

In order to solve the above-mentioned problems, the thirteenth invention of the present invention provides the above-mentioned tenth or eleventh inter-LAN communication device,
In the inter-LAN communication device, the setting means sets whether or not a circuit switched channel can be used as a calling condition of a call for each of the destination addresses.

In order to solve the above-mentioned problems, a fourteenth aspect of the present invention is a LAN-to-LAN communication transmitting apparatus which connects a predetermined network to another network and enables communication between the networks, in a transfer data buffer. Long packet forming means for forming one long packet by blocking the plurality of transmission data when a plurality of transmission data of the same destination is held in
And a packet switching communication unit that transmits the long packet via a packet switching channel.

In order to solve the above-mentioned problems, the fifteenth aspect of the present invention connects a predetermined network to another network, and in a LAN-to-LAN communication receiving apparatus which enables communication between the networks, a packet switching channel is provided. Through,
Inter-LAN communication reception, comprising: receiving means for receiving a long packet containing a plurality of transmission data; and dividing means for dividing the received long packet for each transmission data contained therein. It is a device.

In order to solve the above-mentioned problems, the sixteenth aspect of the present invention connects a predetermined network with another network and transmits data to be transmitted in an inter-LAN communication device which enables communication between the networks. Data determining means for determining whether or not is network management data,
Transfer data buffer checking means for determining whether or not other send data to the same destination as the send data to be sent is held in the transfer data buffer, and held in the transfer data buffer by the transfer data buffer checking means. If it is determined that the network management data is stored in the transfer data buffer, and the network management data is continuously transmitted after the other transmission data is sent, the first switching method or the second switching method. When it is determined that the data is network management data by the first transmission management means for transmitting on the channel by and the data determination means, and the transfer data buffer inspection means determines that the data is not held in the transfer data buffer. In addition, the network management data on the channel by the second switching method. It includes a second transmission management means for leaving the said channel by a first switching system, a LAN communication device, wherein the higher communication cost than the channel by said second switching system.

In order to solve the above-mentioned problems, the seventeenth aspect of the present invention is based on the sixteenth inter-LAN communication device, wherein the first switching system is a line switching system and the second switching system is the same. Is a packet switching system.
It is an N-to-N communication device.

In order to solve the above-mentioned problems, the eighteenth aspect of the present invention connects a predetermined network with another network and transmits data to be transmitted in an inter-LAN communication device which enables communication between the networks. Detecting means for detecting that the transmission data to the same destination exists in the transfer data buffer at a predetermined rate or more, and the detection means causes the transmission data to the same destination as the transmission data to be transmitted to have a predetermined rate or more. When it is determined that there is a channel reservation means for leaving a plurality of channels for the same destination, and the channel reservation means,
And a communication unit that bulk-transmits the transmission data by using a plurality of vacant channels, and is an inter-LAN communication device.

In order to solve the above problems, the nineteenth aspect of the present invention is to connect a predetermined network to another network and to transmit data to be transmitted in an inter-LAN communication device that enables communication between the networks. Detecting means for detecting that the transmission data to the same destination exists in the transfer data buffer at a predetermined rate or more, and the detection means causes the transmission data to the same destination as the transmission data to be transmitted to have a predetermined rate or more. When it is determined that the channels exist, the channel reservation means for allocating N channels by the first switching method to the same destination and the N channels for the first switching method vacated by the channel reservation means are used. Communication means for transmitting the transmission data in bulk, and the channel securing means is based on the first exchange method. If N empty channels do not exist in the channel, the communication of the other destination on the channel by the first switching method is moved to the channel by the second switching method to obtain the N empty channels. Is provided on the channel according to the first exchange method, and the communication cost of the channel according to the first exchange method is higher than that of the channel according to the second exchange method.

Here, the N is an integer of 2 or more.

In order to solve the above problems, the 20th aspect of the present invention is, in the nineteenth inter-LAN communication device, wherein the first switching system is a line switching system and the second switching system is the same. Is a packet switching system.
It is an N-to-N communication device.

[0057]

In the first and second aspects of the present invention, the second communication means sends the call in the second switching system only when there is no free channel in the first switching system. Therefore, when the number of calls that occur is small, communication is performed using the channel of the first switching system, and when the number of calls is large, communication is performed using the channel of the second switching system.

In the third aspect of the present invention, since the circuit switching system is adopted as the first switching system and the packet switching system is adopted as the second switching system, the circuit can be used efficiently and the communication cost can be improved. Is reduced.

In the fourth and fifth aspects of the present invention, when the communication by the first switching system is completed, the communication using the second switching system is changed to use the first switching system. .

In the sixth aspect of the present invention, since the circuit switching system is adopted as the first switching system and the packet switching system is adopted as the second switching system, the circuit can be used efficiently and the communication cost can be improved. Is reduced.

In the seventh aspect of the present invention, when it is determined that the communication by the first exchange method cannot be performed, the communication by the second exchange method is performed.

In the eighth aspect of the present invention, since the circuit switching system is adopted as the first switching system and the packet switching system is adopted as the second switching system, the communication using the channel of the circuit switching system cannot be connected. Even in this case, it is possible to perform communication using the packet switching channel.

In the ninth aspect of the present invention, the communication by the second switching system is performed only when the channel by the first switching system cannot be connected even if a plurality of calls are made. That is, it is determined that the connection cannot be established after retrying a predetermined number of times.

In the tenth aspect of the present invention, since the disconnection condition is set for each destination address, the call can be handled according to its priority.

In the eleventh aspect of the present invention, not only the disconnecting condition but also the calling condition is set, so that the handling can be performed according to the priority of each call.

In the twelfth aspect of the present invention, since the maintenance time of the channel after the communication is not present is adopted as the call disconnection condition, the handling according to the importance of communication or the like for each destination address is performed. It is possible.

In the thirteenth aspect of the present invention, whether or not the circuit-switched channel is used is adopted as the calling condition of the call, so that the circuit-switched channel can be used efficiently.

In the fourteenth aspect of the present invention, a plurality of pieces of transmission data having the same address in the transfer data buffer are grouped together to form a long packet, which enables efficient communication.

According to the fifteenth aspect of the present invention, since the long packet generated by the transmitting apparatus of the fourteenth aspect of the present invention is received and divided, efficient communication is possible.

In the sixteenth and seventeenth aspects of the present invention, the network management data is configured to be attached to other transmissions for communication, so that the network management data can be efficiently transmitted.

According to the eighteenth aspect of the present invention, when transmission data having the same destination address is held in the transfer data buffer, high-speed data transmission is performed by using so-called bulk transmission, so that smooth transmission is possible. Data communication is possible.

According to the nineteenth aspect of the present invention, when there are not enough channels for bulk transmission, another communication is evacuated to another switching system channel to secure the number of channels required for bulk transmission. did.

According to the twentieth aspect of the present invention, bulk transmission is performed on the circuit switched channel, and when necessary, other communication on the circuit switched channel is saved to the packet switched channel.

[0074]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a flow chart showing the operation of a remote router which is a preferred embodiment 1 of the present invention.

The characteristic feature of the first embodiment is that, as will be described below, the channel exchange method for transmitting the newly appearing transmission data in the LAN is not fixed. That is, if there is a vacancy in the circuit switched channel, communication is performed using the circuit switched channel, and if there is no vacancy in the circuit switched channel, communication is performed using the packet switched channel. is there.

As shown in FIG. 1, when transmission data to be transmitted is generated on the LAN, the remote router according to the first embodiment analyzes the destination, that is, the LAN of the other party to be transmitted ( Step 1-1).

With respect to the destination analyzed in step 1-1, whether communication is already performed to the same destination through the circuit switching channel, or whether other transmission data of the same destination is accumulated in the buffer. or not,
Are inspected (step 1-2).

As a result of this inspection in step 1-2,
If data of the same destination is being sent or is about to be sent on a circuit-switched channel, the data currently being sent is stored in a buffer, and this currently used channel is used as it is for data transfer. Send out.

As a result of this inspection in step 1-2,
If the data of the same destination has not been transmitted on the circuit-switched channel and is not found in the buffer, the process proceeds to the next step 1-3.

In step 1-3, it is checked whether there are unused circuit switched channels. If the result of this check is that there is an unused circuit-switched channel, the processing moves to the next step 1-4, otherwise the processing moves to step 1-5.

In step 1-4, the channel for transmitting the data to be transmitted at present is opened by using the new circuit switching channel. Then, the transmission data is communicated using the newly opened circuit switching channel.

On the other hand, in step 1-5, since there is no vacancy in the circuit switching channel, the transmission data is communicated using the packet switching channel. Then, the outgoing data is communicated using this new packet switching channel.

As described above, according to the first embodiment, the circuit-switched channel is used when the circuit-switched channel has a free space, and the packet-switched channel is used only when there is no free space. Therefore, it is possible to effectively utilize communication resources and improve transmission efficiency.

Further, as described in the prior art,
The circuit-switched channel is used when the communication destination is short distance.
Generally, the price will be lower. Therefore, when the communication destination is mainly a short distance, by applying this embodiment,
This has the effect of not only improving transmission efficiency but also reducing communication costs.

Embodiment 2 FIG. 2 is a flow chart showing the operation of a remote router which is a preferred embodiment 2 of the present invention.

A characteristic feature of the second embodiment is that, as described below, if there is communication using the packet switching channel when the circuit switching channel becomes available, that communication is newly added. Allocating to a free circuit-switched channel. That is, it is intended to improve the transmission efficiency by using the circuit switching channel as much as possible.

FIG. 2 is a flow chart showing the operation of the remote router when the communication using the circuit switching channel is finished and the circuit switching channel becomes vacant.

As shown in this flowchart, when the communication is completed, it is first confirmed whether or not the data transmission using the packet switching channel is performed (step 2-1). Of course, what is confirmed here is the communication that has been performed on the circuit switched channel until now.
It is communication to different destinations.

In step 2-1 above, if it is confirmed that the communication is being carried out by the packet switching channel, the sending of the packet to the packet switching channel is interrupted. Then, the data to the destination of the packet transmitted through the packet switching channel is then transmitted using the circuit switching channel (step 2-2). By the way, it is generally considered that there are a plurality of destinations to which data is transmitted through the packet switching channel. In the second embodiment, when there are a plurality of data, the communication to the destination with the largest amount of data to be transmitted is newly allocated to the circuit switching channel. That is, when the packet transmission is interrupted, the packet held in the transfer data buffer 3 in which the packet to be transmitted is buffered is searched, and the destination having the largest number of packets among them is searched. Communication is directed to the circuit-switched channel.

In step 2-1 described above, if no communication using the packet switching channel is performed, the above operation is not performed.

As described above, in the second embodiment, if the communication using the packet switching channel is performed when the communication on the circuit switching channel ends, the communication is newly used on the circuit switching channel. By doing so, it is possible to improve the transmission efficiency. Further, when the communication destination is a short distance, the circuit-switched channel has a lower cost than the packet-switched channel as described above, and therefore, it is possible to reduce the communication cost.

Third Embodiment FIG. 3 is a flowchart showing the operation of the remote router according to the third embodiment.

The characteristic feature of the third embodiment is that, as described below, when the calling process using the circuit-switched channel is performed, all the lines on the other side are used. By this, when the call connection cannot be established, the communication is switched to the communication using the packet switching channel.

Conventionally, the transmission data, which has been transmitted using the circuit-switched channel, has been kept waiting until the channel becomes empty if all the circuit-switched channels on the other side are in use, that is, when busy. On the other hand, according to the third embodiment, the transmission data that normally uses the circuit switching channel is also transmitted using the packet switching channel when the connection with the other party cannot be established. Therefore, the waiting time can be reduced.

FIG. 3 is a flow chart in the case where the remote router according to the third embodiment performs the calling process. As shown in FIG. 3, step 3-
In 1, the calling process is first performed on the circuit switched channel.

Next, in step 3-2, it is checked whether the call connection is successful. Here, if the call connection is successful, the process proceeds to step 3-3, which will be described later, and data transmission continues. If the call connection fails, the process proceeds to the next step 3-4, and retry control is performed.

In step 3-4, it is checked how many times the call connection processing is performed. In this step, for example, it is checked whether or not the calling process has been performed m times. Here, m is a predetermined positive integer. In this step, if it is determined that the calling process is performed m times, it is determined that the connection cannot be established because the other party's line is all in use, and the process proceeds to step 3-5 described later. . When it is determined that the calling process has been performed less than m times, the process proceeds to the next step 3-6, and the calling process is performed again after the lapse of a predetermined wait time.

In step 3-6, the elapsed wait time is counted for a predetermined unit time × n seconds.
Here, as the unit time, a unit time peculiar to the inter-LAN communication device, for example, 500 msec is used. Also, n
Is a constant determined by the destination. This n is predetermined by the other party, as is the case with the above-described number of retries, m. Depending on the other party, the above n and m are
For example, it is defined as in the table shown in FIG.

In the remote router of the third embodiment, n and m are set for each destination address of communication. As shown in the table of FIG. 4, it is generally preferable that the higher the access right, the smaller the n, and the shorter the waiting time, which is the time interval for performing the calling process. is there.

Then, after the wait time has elapsed for a predetermined unit time × n seconds, the process shifts to the above step 3-1 and the calling process is performed again.

In the above step 3-4, if it has been retried m times, the communication by the circuit switched channel is abandoned and the packet switched transmission processing using the packet switched channel is performed (step 3-5).

In this case, since the communication using the circuit switching channel is given up, there is a vacancy in the circuit switching channel. In this case, as in the second embodiment, it is preferable to use the circuit-switched channel for communication that has been using the packet-switched channel until now.
That is, also in the third embodiment, similarly to the second embodiment, the communication using the packet switching channel when the circuit switching channel becomes available is replaced with the communication using the new circuit switching channel. There is.

This operation is shown in the flow chart shown in FIG. That is, after the packet switching transmission processing is performed in step 3-5, step 3-7
In, it is checked whether or not the communication using the packet switching channel has been performed so far. If the result of this check is that communication is being carried out, the processing moves to step 3-8, and after the calling address is changed, communication using the circuit switched channel is newly carried out at step 3-1. If the data to be sent to a plurality of destinations exists in the buffer in step 3-8, the communication to the largest number of destinations is transferred to the communication using the circuit switching channel as in the second embodiment. If it is determined in step 3-7 that communication using the packet switching channel has not been performed so far, the communication process ends.

Of course, if the calling process by the circuit switched channel is successful in the above step 3-2, the circuit switched transmission process is performed in the step 3-3 as in the conventional case.
Done in.

Fourth Embodiment FIG. 5 is a flow chart showing the operation of the remote router which is the fourth preferred embodiment of the present invention.

The characteristic feature of the fourth embodiment is that, as described below, the processing conditions when all the data in the router of the destination connected by the call by the circuit switching channel are transmitted are defined for each destination. That is. That is, the so-called priority in the circuit switching channel is set for each destination.

In the fourth embodiment, four types of priority are defined as follows.

Usage right level 0: The circuit switched channel cannot be used. That is, communication using the packet switching channel is always performed with respect to the destination of the usage right level 0.

Usage right level 1: When all the data in the buffer is transmitted and there is no more data in the buffer, the call is disconnected immediately.

Usage right level 2: When all the data in the buffer is transmitted, the call is not disconnected even if there is no data in the buffer, and no communication continues for a predetermined time (for example, 2 seconds). Only disconnect the call. If transmission data for the same destination occurs within a predetermined time, the call is disconnected only when the non-communication state continues for a predetermined time or more after the time when all the data in the buffer is transmitted.

Usage right level 3: All the data in the buffer is transmitted, and even if there is no data in the buffer, the call is not disconnected and the transmission data is sent to the buffer at regular time intervals from the time the call is connected. Whether or not it exists is monitored, and if there is no transmission data at the time of monitoring, the call is disconnected.

That is, in the fourth embodiment, the usage right level 3 has the highest priority, and the usage right level 0 has the lowest priority. In addition, in the usage right level 3, it is generally preferable that the fixed time interval is a time of a charging unit. That is, when a call occurs once, the data transmission ends before the time of the charging unit elapses, and even if the call is disconnected at that time, the charged fee is the same. In the case of a call that sends a small amount of data, the charge will rather increase. Therefore, it is preferable to keep the call connected as long as the charges are the same. The method of determining connection / non-connection for each charge unit time is also applied to the conventional communication device.

The operation of the remote router according to the fourth embodiment will be described based on the flowchart of FIG.

When a call connection request is generated, that is, when data to be transmitted is generated, first, step 5-1.
At, it is checked whether or not the usage right level of the other party to be connected is 0. The remote router according to the fourth embodiment internally has the table shown in FIG. 4 described above, and the usage right level can be inspected for each destination by searching this table. is there. As a result of this inspection, when the usage right level is 0, the process proceeds to step 5-2 as described later, and the transmission process by the packet switching channel is performed. This is because the use of the circuit-switched channel is not permitted when the usage right level is 0. If the usage right level is not 0, the process proceeds to the next step 5-3.

In step 5-3, a check is made as to whether a call to the destination of the communication is already connected. As a result of this inspection, if the connection is not made, the process proceeds to the next step 5-4, and if the connection is made, the process proceeds to step 5-8 described later.

In step 5-4, call connection is established using the vacant circuit switching channel.

In step 5-5, it is checked whether the usage right level of the corresponding destination address is 3. As a result of this inspection, if the usage right level is 3, the process proceeds to the next step 5-6. If the usage right level is not 3, the process proceeds to step 5-7 described later.

In step 5-6, the destination address and the timer value are set in the corresponding circuit switching monitoring table. FIG. 6 shows an example of this circuit switching monitoring table. As shown in FIG. 6, for each circuit-switched channel, the destination address being used, a transmission flag indicating that transmission is being performed, and a timer value are held in this table.

If the usage right level is other than 3 in step 5-5, the processing shifts to step 5-7. In step 5-7, the destination address is set in the circuit switching monitoring table. In this case, the usage right level is 1 or 2. This is because the timer value need not be set when the usage right level is 1, and the timer value is not always set when the usage right level is 2.

In step 5-3 described above, when a call to the corresponding destination is connected or after the processing in step 5-6 is executed, the processing shifts to step 5-8. In step 5-8, the usage right level is checked. If the result of this inspection is that the usage right level is 2, the processing moves to the next step 5-9. If the usage right level is other than 2, the process proceeds to step 5-10 described later.

At step 5-9, the timer of the corresponding circuit switching monitoring table is reset to zero. Since the usage right level is 2, the timer sets a predetermined time (for example, 2 seconds) set by the operation manager as described above.

At step 5-10, the transmission flag indicating that the transmission is in progress is turned on.

In step 5-11, data is actually transmitted on the circuit switched channel.

In step 5-12, after the data transmission is completed, it is checked whether or not the data to be sent to the same destination exists in the buffer. If such data exists, the process returns to step 5-11 and the actual transmission of data is performed again. If the data does not exist, the process proceeds to step 5-13.

At step 5-13, the corresponding transmission flag is turned off.

In step 5-14, it is checked whether or not the corresponding destination usage right level is 1. As a result of this inspection, when the usage right level is 1, the process proceeds to the next step 5-15. If the usage right level is not 1, the process proceeds to step 5-16 described later.

At step 5-15, the circuit switched channel call is disconnected. In this case, since the usage right level is 1, the call is immediately disconnected when the data transmission is completed.

In step 5-16, it is checked whether or not the corresponding destination usage right level is 2. As a result of this inspection, when the usage right level is 2, the process proceeds to the next step 5-17. If the usage right level is not 2, the communication process ends.

At step 5-17, a predetermined timer value is set in the corresponding circuit switching monitoring table.
This is because the usage right level is 2, so the call is held for a predetermined time (for example, 2 seconds) even after the data transmission is completed.

As described above, step 5-2 is executed when the usage right level of the corresponding destination is 0 in step 5-1. If the usage right level is 0,
Since no circuit-switched channel is used at this step, communication is carried out using the packet-switched channel.

As described above, in the fourth embodiment, the concept of the usage right level is used to define the priority for the circuit switched channel for each destination.

FIG. 7 is a flow chart showing the operation of timer processing in the fourth embodiment. As shown in FIG. 7, in this timer processing, first,
The timer value (non-zero) on the circuit switching monitoring table is decremented (-1) (step 7-1).

In step 7-2, it is checked whether or not the timer value has become zero as a result of this decrement. As a result, if it is zero, the next step 7-3
If it is not zero, the process proceeds to step 7-4 described later.

In step 7-3, time-out processing is performed. Details of this time response process will be described later with reference to the flowchart shown in FIG.

In step 7-4, it is checked whether or not all the above tables have been searched. If all the searches have been completed as a result of this inspection, the process proceeds to the next step 7-5, but if not completed, the process proceeds to step 7-1 again.

In step 7-5, the waiting process for the basic value time is executed. In this step, for example, after waiting for 500 msec, the process moves to the above step 7-1 again.

By repeating such processing, waiting for a certain period of time is realized.

FIG. 8 is a flow chart showing the operation of the timeout process which is step 7-3 in the flow chart shown in FIG.

First, in step 8-1, it is checked whether or not the usage right level of the corresponding destination is 2. If the usage right level is 2 as a result of this inspection, the process proceeds to the next step 8-2. If the usage right level is not 2, the process proceeds to step 8-3 described later.

In step 8-2, the call using the circuit switched channel is disconnected and the corresponding circuit switched monitoring table is reset. This is because the usage right level is 2. As described above, when the usage right level is 2, the call is disconnected when a predetermined waiting time (for example, 2 seconds) elapses after the communication is completed.

In step 8-3, it is checked whether the transmission flag of the corresponding destination is ON.

If it is not ON, the process proceeds to step 8-2, the table is reset and the call is disconnected. Since the processing shifts to the present step 8-3 when the usage right level is 3, the call is disconnected only when communication is not performed after the elapse of a predetermined charging unit. is there.

On the other hand, if the in-transmission flag is ON in this step 8-3, the process proceeds to the next step 8-4. If the in-transmission flag is OFF, the process proceeds to step 8-2 described above, the call is disconnected, and the corresponding circuit switching monitoring table is reset.

At step 8-4, the initial value of the predetermined timer value is set in the circuit switching monitoring table. This is because when data is being transmitted, the transmission is continued and the time-out time is extended by the time that is a predetermined charging unit.

As described above, according to the fourth embodiment, the priority of the circuit switching channel is set for each destination. Therefore,
It is possible to reduce the case where the important destination cannot use the circuit switched channel and prevent the situation where the less important destination occupies the circuit switched channel. As a result, the communication line can be used efficiently. Needless to say, communication costs can be expected to decrease because such efficient use becomes possible.

Embodiment 5 FIG. 10 is an explanatory diagram showing the operation of a remote router which is a preferred embodiment 5 of the present invention. And in FIG.
For comparison with the present invention, an explanatory diagram showing the operation of the conventional inter-LAN communication device is shown in FIG.

As shown in FIG. 9, own LAN
The data 1 to n generated above are converted into packet data including each of them as a data part and sent to the LAN of the other party through the packet switching channel. As shown in FIG. 9, the packet data is the above data 1 to n.
Header control data and trailer control data are added before and after each of the above. In this way, n pieces of packet data are transmitted on the packet switching channel, and n pieces of data appear on the destination LAN.

On the other hand, as shown in FIG. 10, according to the LAN-to-LAN communication device of the fifth embodiment, first of all, as for the data 1, packet data for the data 1 is created and packet switching is performed as in the conventional case. It is sent to the other party's LAN through the channel.

It usually takes a certain time to send the packet data of the data 1. That is, in general L
The transmission rate on the AN is higher than the transmission rate on the packet switched channel. Therefore, the data 2 to n are accumulated in the transfer data buffer 3 while the packet data of the data 1 is being transmitted. As described above, a plurality of data are accumulated in the transfer data buffer 3 as in the conventional case.

A characteristic feature of the fifth embodiment is that, when a plurality of transmission data are stored in the transfer data buffer 3, when the destinations are the same, the plurality of transmission data are collected together. To form one long packet. By forming long packets in this way, it is possible to reduce the proportion of header control data, trailer control data, etc. added, and therefore it is expected that communication efficiency will be improved.

Of course, this long packet cannot exceed the packet length allowed on the packet switching channel. Therefore, in the fifth embodiment, if a packet exceeding the length of the packet allowed in the packet switching channel is accumulated in the transfer data buffer 3, the transmission data is divided in the middle as necessary,
It forms two long packets. That is,
FIG. 10 shows a case where the data 2 to n are accumulated in the transfer data buffer 3 before the transmission of the data 1 is completed. In this case, one long packet is formed by using the data from the data 2 to the middle of the data m. Then, another long packet is formed by using the data from the middle of the data m and the data up to the data n. In this way, by forming the long packet having the maximum length allowed in the packet switching channel, the packet switching channel can be used efficiently.

The long packet thus formed and transmitted is divided into a plurality of pieces of data similar to those on the transmitting side in the communication device of the LAN of the other party. At this time,
As shown in 0, when the first long packet is received, data 2 to data m-1 are
Restored by splitting. Data m cannot be restored yet because not all data has been received.
Then, when the second long packet is received, the first half of the previously received data m and the second half of the newly received data m are combined to restore the entire data m. . When the second long packet is received, the remaining data m + 1 to data n are also restored.

As described above, according to the fifth embodiment,
Since a plurality of transmission data are combined to form a long packet having the maximum packet length allowed in the packet switching channel, it is possible to use the packet switching channel more efficiently. As a result, it goes without saying that the communication cost can be reduced.

Sixth Embodiment FIG. 11 is a flow chart showing the operation of the remote router according to the sixth preferred embodiment of the present invention. The remote router according to the sixth embodiment attempts to efficiently transmit network management data.

As shown in FIG. 11, this Example 6 is used.
When the data to be communicated is generated, the remote router according to (1) first checks whether or not the destination is in call connection using the circuit switching channel (step 11-
1). As a result of this inspection, if the relevant destination is in a call connection,
It is preferable to send out this network management data using the connection. That is, in step 11-2, this network management data is transmitted using the circuit switched channel. On the other hand, as a result of the above inspection, if the corresponding destination is not in a call connection, the next step 1
Move to 1-3.

In step 11-3, it is checked whether the data of the corresponding destination is stored in the transfer data buffer 3. As a result of this inspection, if there is other data to be sent to the corresponding destination, the process proceeds to step 11-4. In step 11-4, this transmission data is
It is stored in the transfer data buffer 3. The case where other data to be sent to the corresponding destination is accumulated is considered to be a waiting state waiting for a channel to be available. Therefore, if a channel becomes available, communication will be performed using that channel. Therefore, if the transmission data network management data that is the object of communication is transmitted after this communication,
Efficient communication is expected. The communication in step 11-4 is performed on either the circuit switched channel or the packet switched channel.

In step 11-5, the protocol of the network management data is analyzed.

In step 11-6, the protocol analyzed in step 11-5 is used in the sixth embodiment.
It is checked whether or not the protocol supported by the remote router according to. As a result of the inspection, if the protocol is supported, the process proceeds to step 11-4, and the communication is performed by either the circuit switched channel or the packet switched channel. As a result of the above inspection, if the protocol is not supported,
Go to next Step 11-7.

In step 11-7, it is checked whether the transmission data to be transmitted is network management data. As a result of this inspection, if the data is not network management data, the process proceeds to step 11-4 described above, and data is transmitted through the packet switching channel or the circuit switching channel. As a result of the inspection, if the data is network management data, the process proceeds to the next step 11-8.

In step 11-8, this network management data is transmitted using the packet switching channel.

As described above, in the sixth embodiment, the data to be sent is controlled so as to be sent together with the data sent to the same destination as much as possible. This also applies to the network management data. A feature of the sixth embodiment is that when there is no transmission data to the same destination as the network management data, the network management data is transmitted using the packet switching channel. With such a configuration, according to the sixth embodiment, since the circuit switched channel is not used only for network management data, the circuit switched channel can be efficiently used and communication can be performed. It is possible to reduce the cost.

Embodiment 7 A flowchart showing the operation of the remote router according to the preferred embodiment 7 of the present invention is shown in FIG. The remote router according to the seventh embodiment realizes smooth data communication by prioritizing communication with respect to one destination when the transmission data for one destination increases in the transfer data buffer 3. .

A feature of the seventh embodiment is that when the transmission data for one destination in the transfer data buffer 3 exceeds a predetermined ratio, so-called bulk transmission is used to prioritize data communication for that destination. And then do. The operation of the remote router according to the seventh embodiment will be described below with reference to the flowchart shown in FIG.

First, in step 12-1, it is checked whether or not the length of transmission data for one and the same address in the transfer data buffer 3 exceeds a predetermined allowable range. This allowable range can be freely set in advance by the operation manager, for example. Then, as a result of this inspection, if the allowable range is not exceeded, the process proceeds to step 12-2 and normal transmission processing is executed. On the other hand, if the result of inspection is that the allowable range is exceeded, the process moves to the next step 12-3.

In step 12-3, it is checked whether there are any free circuit switched channels required for bulk transmission. Bulk transmission is a method of transmitting data by using a plurality of channels at the same time. For example, in the basic interface of ISDN, two circuit-switched channels, that is, two B channels are simultaneously used to transmit data. Is being done. In this step 12-3, it is checked whether the number of channels required for this bulk transmission is empty. As a result of this inspection, if there is a necessary free channel, the next step 12-4 is skipped and the process proceeds to step 12-5. Test results,
If the required free channel does not exist, next step 1
Go to 2-4.

In step 12-4, the communication to the destination different from the destination of the transmission data currently being transmitted is changed from the circuit switching channel to the packet switching channel. That is, communication to another destination, which has been performed on the circuit switched channel, is newly performed using the packet switched channel. Thus, by allocating the communication from the circuit switching channel to the packet switching channel, an empty channel can be generated on the circuit switching channel.

In step 12-5, bulk transmission, that is, communication using a plurality of circuit switched channels is performed. Thus, high-speed data communication is possible by simultaneously using a plurality of circuit switching channels. As a result, according to the seventh embodiment, even when a large amount of data is temporarily generated to the same destination, the high-speed data communication to the same destination is temporarily realized to realize smooth data communication. be able to.

[0169]

As described above, according to the first to ninth aspects of the present invention, the inter-network communication which enables the efficient use of the communication line is realized.

Further, according to the tenth to thirteenth aspects of the present invention, since the use priority of the communication line can be set for each destination, the network can be set according to the communication charge between LANs and the tolerance of transmission delay. It is possible to optimize freely.

Further, according to the fourteenth to fifteenth aspects of the present invention, even when communication by a predetermined exchange system cannot be performed due to a failure of the exchange processing unit of the other LAN communication device,
Since I switched to communication by another exchange method,
An inter-LAN communication device capable of realizing a communication backup function is obtained.

Further, according to the sixteenth to seventeenth aspects of the present invention, the stored communication data of the same destination is blocked into a length allowed by the packet network to form a long packet. It enables economical and efficient communication.

According to the eighteenth to twentieth aspects of the present invention, when a large amount of data of the same destination is stored in the inter-LAN communication device, a plurality of circuit switching channels are used for the same destination. Since I sent data faster than usual,
It is possible to provide an inter-LAN communication device capable of smoothly transmitting data even if a large amount of data momentarily occurs to the same destination.

[Brief description of drawings]

FIG. 1 is a flowchart showing an operation of a remote router according to a preferred first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of a remote router according to a second preferred embodiment of the present invention.

FIG. 3 is a flowchart showing an operation of a remote router according to a preferred third embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating an operation of a remote router according to a preferred third embodiment of the present invention.

FIG. 5 is a flowchart showing the operation of the remote router according to the preferred fourth embodiment of the present invention.

FIG. 6 is an explanatory diagram illustrating an operation of a remote router according to a preferred fourth embodiment of the present invention.

FIG. 7 is a flowchart showing the operation of the remote router according to the preferred fourth embodiment of the present invention.

FIG. 8 is a flowchart showing the operation of the remote router according to the preferred fourth embodiment of the present invention.

FIG. 9 is a diagram for explaining the operation of the remote router according to the preferred fifth embodiment of the present invention, and is an explanatory diagram showing the operation of the conventional remote router.

FIG. 10 is an explanatory diagram showing the operation of the remote router according to the preferred fifth embodiment of the present invention.

FIG. 11 is a flowchart showing the operation of the remote router according to the sixth preferred embodiment of the present invention.

FIG. 12 is a flowchart showing the operation of the remote router according to the preferred embodiment 7 of the present invention.

FIG. 13: Multiple LANs are remote routers and ISDN
It is an explanatory view showing a state of being mutually connected using a network.

FIG. 14 is a configuration block diagram of a conventional remote router.

[Explanation of symbols]

 1 LAN control unit 3 Transfer data buffer 5 Data processing unit 7 Packet switching control unit 9 Circuit switching control unit 11 ISDN control unit 13 Timer 15 Circuit switching monitoring table 17 Circuit switching channel usage right table

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H04L 12/64 9466-5K H04L 11/20 A

Claims (20)

[Claims] 1. A LAN for connecting a predetermined network to another network to enable communication between the networks.
In the inter-communication device, when transmission data to be transmitted is generated, a channel use status determining means for determining whether or not the destination of the transmission data is already being communicated by the channel according to the first exchange method, When the channel availability determination means for determining whether or not there is an available channel according to the first exchange method and the channel usage status determination means determines that communication is already being performed on the channel according to the first exchange method. In the case where the first communication means for transmitting the transmission data on the channel in which the communication is performed and the channel availability determination means determines that there is an available channel in the first exchange method, A second communication means for newly opening a channel according to the first switching system and transmitting the transmission data through the new channel; And a second communication method for transmitting the transmission data through a channel according to the second exchange method when it is determined that there is no space, the first exchange method and the second exchange method. An inter-LAN communication device having a different transmission speed from the exchange system. 2. A LAN that connects a predetermined network to another network and enables communication between the networks.
In the inter-communication device, when transmission data to be transmitted is generated, a channel use status determining means for determining whether or not the destination of the transmission data is already being communicated by the channel according to the first exchange method, When the channel availability determination means for determining whether or not there is an available channel according to the first exchange method and the channel usage status determination means determines that communication is already being performed on the channel according to the first exchange method. In the case where the first communication means for transmitting the transmission data on the channel in which the communication is performed and the channel availability determination means determines that there is an available channel in the first exchange method, A second communication means for newly opening a channel according to the first switching system and transmitting the transmission data through the new channel; And a second communication method for transmitting the transmission data through a channel according to the second exchange method when it is determined that there is no space, the first exchange method and the second exchange method. An inter-LAN communication device characterized in that a charging system is different from the exchange system. 3. The inter-LAN communication device according to claim 1 or 2, wherein the first switching system is a circuit switching system and the second switching system is a packet switching system. LAN-to-LAN communication device. 4. A LAN which connects a predetermined network to another network and enables communication between the networks.
In the inter-communication device, an end detection unit that detects that the communication performed on the channel by the first exchange system has ended, and a communication performed by the end detection unit on the channel by the first exchange system When the termination is detected, a channel changing unit for newly using the channel according to the first exchange method for communication performed by the channel according to the second exchange method is included. And a communication speed between the second exchange method and the second exchange method is different. 5. A LAN for connecting a predetermined network to another network and enabling communication between the networks.
In the inter-communication device, an end detection unit that detects that the communication performed on the channel by the first exchange system has ended, and a communication performed by the end detection unit on the channel by the first exchange system When the termination is detected, a channel changing unit for newly using the channel according to the first exchange method for communication performed by the channel according to the second exchange method is included. And an inter-LAN communication device, wherein a charging method is different from the second exchange method. 6. The inter-LAN communication device according to claim 4 or 5, wherein the first switching method is a circuit switching method and the second switching method is a packet switching method. Inter-LAN communication device. 7. A LAN for connecting a predetermined network to another network and enabling communication between the networks.
In the inter-communication device, in order to perform communication on the channel according to the first exchange method, the first calling means for performing the call processing, and for performing communication on the channel according to the second exchange method, the call processing is performed. Second calling means to perform, and the first calling means, if it is determined that it is not possible to connect to the other party of the communication even if the call processing is performed, the second calling means newly An inter-LAN communication device, comprising: a channel changing unit that uses the channel according to the second switching method to perform communication. 8. The inter-LAN communication device according to claim 7, wherein the first switching method is a circuit switching method and the second switching method is a packet switching method. Communication device. 9. The LAN-to-LAN communication device according to claim 7, wherein the first calling means is capable of establishing connection with a communication partner even if the call processing is performed a plurality of times. L characterized by determining that it cannot be connected to
Inter-AN communication device. 10. An LA that connects a predetermined network to another network and enables communication between the networks.
An inter-LAN communication device, characterized in that the inter-N communication device includes disconnection condition setting means capable of setting a disconnection condition of a call after the communication is completed for each destination address of the communication. 11. An LA that connects a predetermined network to another network and enables communication between the networks.
In the N-to-N communication device, the disconnection condition setting means that can set the disconnection condition of the call after the communication is completed for each communication destination address, and the call origination condition of the call can be set for each communication destination address An inter-LAN communication device, comprising: 12. The LAN-to-LAN communication device according to claim 10, wherein the setting unit sets, as a call disconnection condition, a length of time for which the channel is maintained after communication using the channel does not exist. An inter-LAN communication device is set for each destination address. 13. The inter-LAN communication device according to claim 10 or 11, wherein the setting means determines whether or not a circuit-switched channel can be used as a call origination condition for each destination address. An inter-LAN communication device characterized by being set. 14. An LA which connects a predetermined network to another network and enables communication between the networks.
In the N-to-N communication transmission device, when a plurality of transmission data of the same destination is held in the transfer data buffer, a long packet forming means for forming one long packet by blocking the plurality of transmission data. A packet switching communication means for transmitting the long packet via a packet switching channel. 15. An LA that connects a predetermined network to another network and enables communication between the networks.
In an N-to-N communication receiving device, a receiving means for receiving a long packet containing a plurality of transmission data via a packet switching channel, and a division for dividing the received long packet for each transmission data contained therein. An inter-LAN communication receiving device comprising: 16. An LA which connects a predetermined network to another network and enables communication between the networks.
In the N-to-N communication device, a data judging means for judging whether or not the transmission data to be transmitted is network management data, and another transmission data to the same destination as the transmission data to be transmitted are held in the transfer data buffer. And a transfer data buffer inspecting means for determining whether or not the network management data is stored in the transfer data buffer when the transfer data buffer inspecting means determines that the network management data is held.
After the other transmission data is transmitted, the network management data is transmitted by the first transmission management means for transmitting the network management data on the channel according to the first exchange method or the second exchange method. Second transmission for sending the network management data through the channel according to the second switching method when it is determined that there is and the transfer data buffer checking unit determines that the network management data is not held in the transfer data buffer. An inter-LAN communication device, comprising: a management unit, wherein the channel according to the first exchange method has a higher communication cost than the channel according to the second exchange method. 17. The LAN communication device according to claim 16, wherein the first switching system is a circuit switching system and the second switching system is a packet switching system. Intercommunication device. 18. An LA which connects a predetermined network to another network and enables communication between the networks.
In the N-to-N communication device, a detection unit that detects that the transmission data to the same destination as the transmission data to be transmitted exists in the transfer data buffer at a predetermined ratio or more, and the transmission data to be transmitted by the detection unit. When it is determined that the transmission data for the same destination is equal to or more than a predetermined ratio, a channel reservation unit that reserves a plurality of channels for the same destination, and a plurality of channels that are reserved by the channel reservation unit are used. And a communication means for sending the transmission data in bulk, the inter-LAN communication device. 19. An LA which connects a predetermined network to another network and enables communication between the networks.
In the N-to-N communication device, a detection unit that detects that the transmission data to the same destination as the transmission data to be transmitted exists in the transfer data buffer at a predetermined ratio or more, and the transmission data to be transmitted by the detection unit. When it is determined that the transmission data for the same destination is equal to or more than a predetermined ratio, N channels are reserved by the first switching system for the same destination, and N channels reserved by the channel reservation unit. Communication means for transmitting the transmission data in bulk using a number of channels of the first switching method, wherein the channel securing means includes N empty channels in the channels of the first switching method. Is not present, the other destination's communication on the first switched channel is transferred to the second switched channel. Then, N free channels are provided on the channel according to the first exchange method, and the channel according to the first exchange method has a higher communication cost than the channel according to the second exchange method. Communication device. Here, the N is an integer of 2 or more. 20. The LAN communication apparatus according to claim 19, wherein the first switching system is a circuit switching system, and the second switching system is a packet switching system. Intercommunication device.