JPH11112603A - Communication system between different kinds of networks - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication system between different kinds of networks by which the occurrence of data collision is surely recognized for the user. SOLUTION: An exchange system 40 that applies connection control to communication between a high-speed communication network 20 and a low-speed communication network 30 is provided with a speed conversion circuit 42 that matches the communication speed of incoming teletext data from the high-speed communication network 20 to the low-speed communication network 30 with the communication speed of the low-speed communication network 30, a low-speed data transmission circuit 43 that sends the incoming teletext data to the low-speed communication network 30 at the matched communication speed, an echo back circuit 44 that generates echo back for returning the incoming character data to the high-speed communication network 20 as soon as the incoming teletext data are sent, a collision detection circuit 46 that adds collision teletext data and collision identification data to the echo back data, generates returned teletext data and returns the data to the high-speed communication network 20, when collision teletext data are detected from the outgoing teletext data and the incoming teletext data from the low-speed communication network 30 during transmission of the incoming teletext data, and a high-speed data transmission circuit 47.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication apparatus between heterogeneous networks for controlling connection between communication networks having different communication speeds.

[0002]

2. Description of the Related Art Conventionally, in such a communication apparatus between heterogeneous networks, connection between communication networks having different communication speeds is controlled and controlled. It is necessary to match the communication speed between communication networks.

[0003] Therefore, in such an inter-heterogeneous network communication apparatus, when transmitting communication data from a transmission-side communication network to a reception-side communication network, the communication apparatus receives the communication data from the transmission-side communication network and receives the communication data. The data is matched to the communication speed corresponding to the receiving communication network, and the matched communication data is transmitted to the receiving communication network.

Further, in this heterogeneous network communication apparatus,
At the same time as transmitting the communication data to the receiving communication network at the adjusted communication speed, the communication data is returned to the transmitting communication network as echo back data by echo back processing.

A heterogeneous network communication system employing such a conventional inter-network communication device will be described. FIG.
1 is a block diagram showing a schematic configuration inside a switching system with a speed conversion function which is a main part of a conventional heterogeneous network communication system employing a heterogeneous network communication device.

[0006] As shown in FIG.
00 is a high-speed data communication terminal 101 accommodated in a high-speed communication network, a low-speed data communication terminal 102 accommodated in a low-speed communication network, and connects the high-speed data communication terminal 101 and the low-speed data communication terminal 102. And a switching system with a speed conversion function (hereinafter, simply referred to as a switching system) 103 which is a communication device between heterogeneous networks. When connecting the high-speed data communication terminal 101 and the switching system 103, it is assumed that they are connected via a modem (not shown).

The switching system 103 includes a high-speed data receiving circuit 104 for receiving uplink character data, which is uplink communication data having a high communication speed from the high-speed data communication terminal 101 to the low-speed data communication terminal 102. A speed conversion circuit 105 for converting the speed of the upstream character data received by the high-speed data receiving circuit 104 so as to match the communication speed of the low-speed communication network; Low-speed data transmission circuit 1 for transmitting to low-speed data communication terminal 102 in a low-speed communication network
06 and an echo-back circuit for performing echo-back processing for generating echo-back data for returning the upward character data transmitted to the low-speed data communication terminal 102 by the low-speed data transmission circuit 106 to the high-speed data communication terminal 101. 107, a low-speed data receiving circuit 108 for receiving downlink character data which is downlink communication data from the low-speed data communication terminal 102 to the high-speed data communication terminal 101, A collision detection circuit 109 for detecting collision data that has collided with character data, that is, collision character data, and adding the collision character data to echo back data to generate return character string data; A high-speed data transmission circuit 110 for transmitting to the high-speed data communication terminal 101 of the high-speed communication network; It is.

The speed conversion circuit 105 temporarily stores the upstream character data from the high-speed communication network via the high-speed data receiving circuit 104 to change the communication speed of the upstream character data from high speed to low speed. It is something to convert.

FIG. 5 is a flowchart showing an outline of a collision data reporting process in a switching system 103 as a conventional inter-heterogeneous network communication device.

[0010] The collision data reporting process is a process in which when upstream character data is transmitted from the high-speed data communication terminal 101 to the low-speed data communication terminal 102, a data collision occurs between the upstream character data and the downstream character data. The occurrence of the occurrence is combined with the echo back data, and the terminal 101 for high-speed data communication is used.
This is the process of reporting to.

In FIG. 5, a high-speed data receiving circuit 104
Is transmitted from the high-speed data communication terminal 101 of the high-speed communication network to uplink character data (step S51), and receives this uplink character data (step S52).

When the high-speed data receiving circuit 104 transmits the upstream character data to the speed conversion circuit 105, the speed conversion circuit 105 executes a speed conversion process on the upstream character data (step S53). Note that the speed conversion processing by the speed conversion circuit 105 is to store the uplink character data from the high-speed data communication terminal 101 so that the communication speed of the uplink character data becomes the communication speed of the low-speed data communication terminal 102. Be consistent.

The speed conversion circuit 105 transmits the speed-matched upstream character data to the low-speed data transmission circuit 106. When the low-speed data transmission circuit 106 receives the speed-matched upstream character data, the low-speed data transmission circuit 106 A transmission start process for starting the transmission operation of the uplink character data to the data communication terminal 102 is started (step S5).
4).

Simultaneously with the start of the transmission start processing, the collision detection circuit 109 transmits the uplink character data and the high-speed data communication terminal 10 from the low-speed data communication terminal 102.
A collision data detection process is started to detect collision character data that collided with character data going down to 1 (step S55).

Next, the low-speed data transmission circuit 106 determines whether or not the transmission activation process started in step S54 has been completed (step S56). If the transmission activation process has been completed, the collision detection circuit 109 in step S55
Ends the collision data detection process (step S5).
7).

The low-speed data transmission circuit 106 starts transmission of uplink character data to the low-speed data communication terminal 102 and the echo back circuit 107 when the transmission start processing is completed in step S56. The detection circuit 109 ends the collision data detection processing at the stage when the transmission of the uplink character data by the low-speed data transmission circuit 106 starts.

When the collision detection circuit 109 detects collision character data during the collision data detection processing time from step S55 to step S57, the collision detection circuit 109 extracts the collision character data (step S58). It is stored in a memory (not shown) (step S59).

When the collision detection processing is completed in step S57, the echo back circuit 107 performs an echo back processing on the upward character data from the low-speed data transmission circuit 106, and sends the echo-back processing to the high-speed data communication terminal 101. The echo back data to be returned is generated (step S60).

The collision detection circuit 109 determines whether a data collision has occurred during the collision data detection processing time (step S61). The determination as to whether or not a data collision has occurred can be made based on whether or not there is collision character data stored in the memory.

If there is collision character data stored in this memory, it is determined in step S61 that a data collision has occurred, and the collision detection circuit 109 reads the collision character data stored in this memory (step S61). S62) Return character string data is generated by adding the collision character data to the echo back data (step S6).
3).

The collision detection circuit 109 transmits the returned character string data to the high-speed data transmission circuit 110, and the high-speed data transmission circuit 110 transmits the character string data to the high-speed data communication terminal 110 in order to transmit the returned character string data to the high-speed data communication terminal 110. A column return process is executed (step S64), and the processing operation in the collision data report process ends.

If no data collision occurs during the collision data detection processing time in step S61, the collision detection circuit 109 generates echo back data from the echo back circuit 107 as return character string data (step S61).
65), and proceed to step S63.

Therefore, the conventional heterogeneous network communication system 100
According to the switching system 103, when uplink character data is transmitted from the high-speed data communication terminal 101 to the low-speed data communication terminal 102, the data between the uplink character data and the downlink character data is transmitted during the collision data detection processing time. Even if a collision occurs, return character string data is generated by adding the collision character data to the echo back data based on the upstream character data, and the returned character string data is transmitted to the high-speed data communication terminal 10.
1 so that the user of the high-speed data communication terminal 101
The occurrence of the collision character data can be recognized based on the collision character data included in the returned character string data being displayed on the first display.

[0024]

As described above, according to the above-described switching system 103 as a conventional inter-network communication apparatus, when transmitting uplink character data from the high-speed data communication terminal 101 to the low-speed data communication terminal 102, When a data collision occurs between the upward character data and the downward character data, return character string data is generated by adding the collision character data to the echo back data, and the return character string data including the collision character data is converted to high-speed data. Communication terminal 101
Was to be returned to

However, according to the switching system 103 as a communication apparatus between heterogeneous networks, even if an input error occurs, it is assumed that data collision occurs as if data collision actually occurred. Since the returned character string data is returned to the high-speed data communication terminal 101, the user of the high-speed data communication terminal 101 determines whether the collision character data included in the returned character string data is due to an input error or due to a data collision. There was a first problem that it was not possible to recognize whether the object was an object.

According to the conventional switching system 103 as a communication device between heterogeneous networks, when transmitting uplink character data (uplink communication data) from the high-speed data communication terminal 101 to the low-speed data communication terminal 102, The collision data detection time for detecting a data collision occurring between the uplink character data (uplink communication data) and the downlink character data (downlink communication data) is only between the start of transmission start processing of the low-speed data transmission circuit 106 and the completion of the processing. No, that is, uplink character data (uplink communication data) by the low-speed data transmission circuit 106
Since the data collision detection operation ends at the stage when the transmission operation starts, the detection time is very short, and there is a second problem that it is difficult to detect the data collision.

The first invention of the present invention has been made in view of the above-mentioned first problem, and a first object of the present invention is to make it possible for a user to reliably recognize the occurrence of a data collision. An object of the present invention is to provide a communication device between heterogeneous networks.

The second invention has been made in view of the second problem, and a second object of the present invention is to reliably detect collision data between uplink communication data and downlink communication data. An object of the present invention is to provide an inter-heterogeneous network communication device that can be detected.

[0029]

In order to achieve the first object, according to the first aspect of the present invention, there is provided an inter-heterogeneous network communication apparatus for connecting and controlling communication between communication networks having different communication speeds. An inter-network communication device, when receiving upstream communication data from the transmission-side communication network to the reception-side communication network, speed matching means for matching the communication speed of the upstream communication data to the communication speed of the reception-side communication network; Transmitting means for transmitting upstream communication data to the receiving communication network at the communication speed matched by the speed matching means; and transmitting the upstream communication data to the receiving communication network by the transmitting means, Echo-back generating means for generating echo-back data for returning to the communication network; and, during transmission of upstream communication data by the transmission means, transmission data from the receiving communication network to the transmitting communication network. Collision detecting means for detecting collision data colliding with the upstream communication data, and when the collision detecting means detects the collision data, the collision data detected by the collision detecting means and the collision data are identified. And identification data adding means for generating return string data by adding the collision identification data to the echo back data by the echo back generating means, and returning the returned string data to the transmission side communication network. .

The heterogeneous network communication apparatus corresponds to a switching system with a speed conversion function for controlling connection between communication networks having different communication speeds.

The communication networks having different communication speeds are as follows:
For example, it corresponds to a high-speed communication network having a high communication speed or a low-speed communication network having a low communication speed.

The communication between the communication networks corresponds to, for example, communication between a high-speed data communication terminal accommodated in a high-speed communication network and a low-speed data communication terminal accommodated in a low-speed communication network.

The upstream communication data is transmitted from a high-speed data communication terminal accommodated in a high-speed communication network, for example, from a high-speed data communication terminal accommodated in a high-speed communication network to a low-speed data communication accommodated in a low-speed communication network, such as a receiving communication network. This corresponds to upward character data transmitted to the terminal for use.

[0034] The downlink communication data corresponds to downlink character data transmitted from a receiving communication network to a transmitting communication network, for example, from a low-speed data communication terminal to a high-speed data communication terminal.

For example, when communication data is transmitted from a high-speed communication network to a low-speed communication network, the speed matching means accumulates communication data having a high communication speed transmitted from the high-speed communication network, thereby obtaining the communication data. This corresponds to a speed conversion circuit that matches the communication speed of the low speed communication network with the communication speed of the low speed communication network.

The transmission means corresponds to, for example, a low-speed data transmission circuit for transmitting communication data adjusted to the communication speed of the low-speed communication network by the speed matching means to the low-speed communication network.

For example, when transmitting communication data from a high-speed communication network to a low-speed communication network, the echo-back generating means transmits the upstream communication data to the transmission-side communication simultaneously with the transmission of the upstream communication data to the low-speed communication network by the transmission means. This is equivalent to an echo-back circuit that generates echo-back data for returning to a high-speed communication network which is a network.

The collision detecting means detects a data collision occurring during transmission between uplink communication data and downlink communication data. For example, the collision detection means detects collision character data occurring during transmission between uplink character data and downlink character data. This is equivalent to a collision detection circuit that performs the following.

When the collision detecting means detects the collision data, the identification data adding means identifies the collision data and the collision data when returning the echo back data to the transmitting communication network. This corresponds to a collision detection circuit and a high-speed data transmission circuit which generate return string data by adding collision identification data and return the return string data to the transmission side communication network.
The return string data corresponds to return character string data generated by adding collision character data and collision identification data for identifying the collision character data to the echo back data.

Therefore, according to the inter-heterogeneous network communication apparatus of the first invention, when transmitting the upstream communication data from the transmitting communication network to the receiving communication network, a data collision occurs between the upstream communication data and the downstream communication data. Then, collision data is detected by the collision detection means, the collision data and collision identification data for identifying the collision data are added to the echo back data to generate return string data, and the return string data is transmitted to the transmission side communication. Since the data is returned to the network, the user of the communication network on the transmission side that has received the return sequence data, based on the presence or absence of collision identification data included in the return sequence data,
It is possible to reliably recognize whether the collision data included in the return string data is due to an input error or a data collision.

Further, the inter-heterogeneous network communication apparatus according to the second invention of the present invention is an inter-heterogeneous network communication apparatus for controlling connection between communication networks having different communication speeds, and receives from a transmitting communication network. When receiving the upstream communication data to the communication network of the side, the speed matching means for matching the communication speed of the upstream communication data to the communication speed of the receiving communication network, and the upstream communication data at the communication speed matched by the speed matching means. Means for transmitting the upstream communication data to the receiving communication network by the transmitting means, and an echo for generating echo back data for returning the upstream communication data to the transmitting communication network. When the communication speed of the upstream communication data is speed-matched by the back generation unit and the speed matching unit,
Based on the communication speed of the upstream communication data after the speed matching and the data amount of the upstream communication data transmitted from the transmission unit to the receiving communication network, the data transmission from the transmitting unit to the receiving communication network in the upstream communication data is performed. Transmission time calculating means for calculating the time, and simultaneously with the upstream communication data transmission to the receiving communication network by the transmitting means, set the data transmission time calculated by the transmission time calculating means as a collision data detection time, Collision detection means for detecting collision data colliding between the downstream communication data from the receiving communication network to the transmission communication network and the upstream communication data during the collision data detection time; Is detected, the collision data detected by the collision detection means, and
Identification data adding means for generating return data by adding the collision identification data for identifying the collision data to the echo back data by the echo back generation means, and returning the return data to the transmission side communication network. Features. The description of the configuration and operation overlapping with the first invention is omitted.

When the transmission speed of the upstream communication data is rate-matched by the rate matching means,
Based on the communication speed of the upstream communication data after the speed matching and the data amount of the upstream communication data transmitted from the transmission unit to the receiving communication network, the data transmission from the transmitting unit to the receiving communication network in the upstream communication data is performed. The time is calculated.

The collision detecting means sets the data transmission time calculated by the transmission time calculating means as the collision data detection time at the same time as the transmission of the upstream communication data to the receiving communication network by the transmission means. It detects collision data that has collided between downlink communication data from the receiving communication network to the transmitting communication network and the uplink communication data during the detection time.

Therefore, according to the inter-heterogeneous network communication apparatus of the second invention, in addition to the effect of the first invention, when transmitting upstream communication data from the transmitting communication network to the receiving communication network, speed matching is performed. Since the data transmission time from the transmission means to the receiving communication network is calculated based on the communication speed of the subsequent uplink communication data and the transmission data amount, the data transmission time is set as the collision data detection time. By setting the collision data detection time longer than in the prior art, collision data generated during uplink communication data transmission can be reliably detected without fail.

[0045]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a heterogeneous network communication system showing an embodiment employing a heterogeneous network communication apparatus of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a heterogeneous network communication system according to the present embodiment.
1 is a block diagram showing a schematic configuration inside a switching system with a speed conversion function which is a main part inside a heterogeneous network communication system shown in the present embodiment.

The heterogeneous network communication system 10 shown in FIG.
A high-speed communication network 20 and a low-speed communication network 30 having different communication speeds, and a switching system with a speed conversion function (hereinafter simply referred to as a switching system), which is a communication device between different networks for controlling connection between the high-speed communication network 20 and the low-speed communication network 30. 40).

The high-speed communication network 20 contains a high-speed data communication terminal 21 as a communication terminal, and a modem 22 for connecting the high-speed data communication terminal 21 to the switching system 40.

The low-speed communication network 30 accommodates a low-speed data communication terminal 31 that enables low-speed data communication with the switching system 40.

The switching system 40 shown in FIG. 2 is configured such that the high-speed data communication terminal 21 of the high-speed communication network 20
A high-speed data receiving circuit 41 that receives uplink character data that is uplink communication data to the low-speed data communication terminal 31;
By accumulating the uplink character data received by the high-speed data receiving circuit 41, the speed converting circuit 4 performs a speed converting process to match the communication speed for the low-speed communication network 30.
2, a low-speed data transmission circuit 43 for transmitting the uplink communication data speed-matched by the speed conversion circuit 42 to the low-speed data communication terminal 31 and the echo back circuit 44, and the uplink character data from the low-speed data transmission circuit 43. And an echo back circuit 44 for performing echo back processing to generate echo back data to be sent back to the high speed data communication terminal 21 on the transmission side, and a high speed data communication from the low speed data communication terminal 31 of the low speed communication network 30. When a data collision occurs between the low-speed data receiving circuit 45 and the low-speed data receiving circuit 45 that receives the low-speed character data that is the low-speed communication data to the terminal 21, the collision character data is detected. A collision character data and collision identification data for identifying the collision character data are added to the echo back data to return a character string. Collision detection circuit 46 for generating over data
And a high-speed data transmission circuit 47 for transmitting the character string data returned from the collision detection circuit 46 to the high-speed data communication terminal 21.
And

The high-speed data communication terminal 21 and the low-speed data communication terminal 31 are provided with displays, and return character string data is displayed on the screen.

Next, the operation of the heterogeneous network communication system 10 according to the present embodiment will be described. FIG. 3 is a flowchart showing a processing operation in a collision data reporting process in the heterogeneous network communication system 10 shown in the present embodiment.

The collision data reporting process is to detect a collision between the upward character data and the downward character data between the high-speed communication network 20 and the low-speed communication network 30 and detect the collision character data. This is a process for reliably reporting to the high-speed data communication terminal 21 of the high-speed communication network 20 that is the transmitting side that the data collision has occurred.

In FIG. 3, the high-speed data receiving circuit 41
When upstream character data is transmitted from the high-speed data communication terminal 21 to the high-speed data receiving circuit 41 via the modem 22 (step S1), the upstream character data is received (step S2).

The high-speed data receiving circuit 41 transmits the upward character data to the speed converting circuit 42. This speed conversion circuit 42 stores the upgoing character data,
This upstream character data is subjected to speed conversion processing for speed matching with the communication speed of the low-speed communication network 30 (step S).
3).

The speed conversion circuit 42 calculates the data transmission time from the start of data transmission to the completion of data transmission by the low-speed data transmission circuit 43 based on the transmission speed and the transmission data amount of the uplink character data after the speed matching. Then, the data transmission time is set as the collision data detection time (step S4).

The speed conversion circuit 42 transmits the upstream character data to the low-speed data transmission circuit 43, and the low-speed data transmission circuit 43 transmits the upstream character data to the low-speed data communication terminal 31 for starting transmission. An activation process is performed (step S5).

In response to the start of transmission start processing by the low-speed data transmission circuit 43, the collision detection circuit 46
The timer based on the collision data detection time set in step S4 is started to start collision data detection processing (step S6).

When the transmission activation process is completed, the low-speed data transmission circuit 43 transmits the character data to the low-speed data communication terminal 31 and the echo back circuit 44.
When receiving the upward character data from the low-speed data transmission circuit 43, the echo back circuit 44 performs echo-back processing on the upward character data to generate echo-back data (step S7). When generating the echo back data, the echo back circuit 44 transmits the echo back data to the collision detection circuit 46.

Next, the collision detection circuit 46 starts the collision data detection processing simultaneously with the start of the collision data detection time timer in step S6, and determines whether or not the collision data detection time timer has timed out (step S6). S8).

If the collision data detection time timer has timed out, the collision data detection processing ends (step S9). Note that the collision detection processing is executed until the collision data detection time timer times out, and the collision detection circuit 46 detects collision character data within the collision data detection time (step S1).
0), the collision character data is stored and held in a memory (not shown) (step S11).

When the collision data detection processing is completed in step S9, it is determined whether or not a data collision has occurred within the collision data detection time (step S12). It should be noted that the determination of the presence / absence of data collision can be made based on whether or not there is collision character data stored in the above-mentioned memory.

If a data collision has occurred in step S12, the collision detection circuit 46 reads the collision character data stored in the memory (step S13). The collision detection circuit 46 generates return character string data by adding the collision character data and collision identification data indicating that the data is due to a data collision to the echo back data from the echo back circuit 44. (Step S14).

The collision detection circuit 46 transmits the returned character string data to the high-speed data transmission circuit 47, and the high-speed data transmission circuit 47 transmits the returned character string data to the high-speed data communication terminal via the modem 22. 21 is executed (step S1).
5), the processing operation of the collision data report processing ends.

If no data collision has occurred in step S12, the collision detection circuit 46 generates the echo back data from the echo back circuit 44 as return character string data (step S16), and proceeds to step S15.
Move to

According to the present embodiment, when transmitting data from the high-speed data communication terminal 21 to the low-speed data communication terminal 31, if a data collision occurs between the upstream character data and the downstream character data, the collision detection is performed. The collision character data is detected by the circuit 46, the collision character data and the collision identification data are added to the echo back data to generate return character string data, and the return character string data is returned to the high-speed data communication terminal 21. Thus, the user of the high-speed data communication terminal 21 determines whether or not the high-speed data communication terminal 21 has the return character string based on the presence or absence of the collision identification data included in the return character string data being displayed on the display of the high-speed data communication terminal 21. Visually recognize whether the collision character data included in the data is due to an input error or a data collision. Can.

According to the present embodiment, when transmitting uplink character data from high-speed data communication terminal 21 to low-speed data communication terminal 31, the communication speed and transmission data amount of uplink character data after speed matching are transmitted. , A data transmission time from the low-speed data transmission circuit 43 to the low-speed data communication terminal 31 is calculated, and this data transmission time is set as a collision data detection time. At the same time, a timer based on the collision data detection time is started, and the collision character data detection operation is performed until the timer times out, so that the collision data detection time is set to be longer than in the related art. Therefore, it is possible to reliably detect the collision character data generated during the transmission of the upstream communication data without fail.

[0067]

According to the communication apparatus for heterogeneous networks of the first aspect of the present invention configured as described above, when the upstream communication data is transmitted from the transmitting communication network to the receiving communication network, the upstream communication data is transmitted. And when a data collision occurs between downlink communication data, the collision detection means detects the collision data,
The collision data and the collision identification data for identifying the collision data are added to the echo back data to generate return string data, and the return string data is returned to the transmission side communication network. The user of the transmission-side communication network that has received the message, based on the presence or absence of the collision identification data included in the return sequence data, determines whether the collision data included in the return sequence data is due to an input error or a data collision. Can be surely recognized.

According to the inter-heterogeneous network communication apparatus of the second invention, in addition to the effect of the first invention, when transmitting upstream communication data from the transmitting communication network to the receiving communication network,
The data transmission time from the transmission means to the receiving communication network is calculated based on the communication speed of the uplink communication data after the speed matching and the transmission data amount, and the data transmission time is set as the collision data detection time. Therefore, by setting the collision data detection time longer than in the related art, it is possible to reliably detect collision data generated during uplink communication data transmission without fail.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a heterogeneous network communication system shown in an embodiment employing a heterogeneous network communication device of the present invention.

FIG. 2 is a block diagram showing a schematic configuration inside a switching system which is a main part of the heterogeneous network communication system shown in the present embodiment.

FIG. 3 is a flowchart showing an outline of a collision data reporting process in the switching system of the heterogeneous network communication system shown in the present embodiment.

FIG. 4 is a block diagram showing a schematic configuration inside a switching system which is a main part of a heterogeneous network communication system employing a conventional heterogeneous network communication device.

FIG. 5 is a flowchart showing an outline of a collision data report process in a switching system of a heterogeneous network communication system employing a conventional inter-network communication device.

[Explanation of symbols]

Reference Signs List 20 High-speed communication network (communication network) 21 High-speed data communication terminal 30 Low-speed communication network (communication network) 31 Low-speed data communication terminal 40 Switching system with speed conversion function (switching system; communication device between heterogeneous networks) 42 Speed conversion circuit ( Speed matching means, data transmission time calculation means) 43 low-speed data transmission circuit (transmission means) 44 echo back circuit (echo back generation means) 46 collision detection circuit (collision detection means, identification data addition means) 47 high-speed data transmission circuit (identification) Data addition means)

Claims (2)

[Claims] An inter-hetero network communication apparatus for controlling connection between communication networks having different communication speeds, the communication system comprising: receiving uplink communication data from a transmission communication network to a reception communication network; Speed matching means for matching the communication speed of data with the communication speed of the receiving communication network; transmission means for transmitting uplink communication data to the receiving communication network at the communication speed matched by the speed matching means; At the same time as the uplink communication data transmission to the receiving communication network, echo back generating means for generating echo back data for returning the uplink communication data to the transmitting communication network, and during the uplink communication data transmission by the transmission means, Collision detection means for detecting collision data that has collided between downlink communication data from the receiving communication network to the transmitting communication network and the uplink communication data; When the collision data is detected, the collision data detected by the collision detection means and the collision identification data for identifying the collision data are added to the echo back data by the echo back generation means to generate return string data, An identification data adding means for returning the return string data to the transmission side communication network. 2. A communication apparatus between heterogeneous networks for controlling connection between communication networks having different communication speeds, the communication apparatus comprising: receiving uplink communication data from a transmission-side communication network to a reception-side communication network; Speed matching means for matching the communication speed of data with the communication speed of the receiving communication network; transmission means for transmitting uplink communication data to the receiving communication network at the communication speed matched by the speed matching means; Echo-back generating means for generating echo-back data for returning the uplink communication data to the transmission-side communication network at the same time as the uplink communication data transmission to the receiving-side communication network, When the communication speeds are matched, based on the communication speed of the upstream communication data after the speed matching and the data amount of the upstream communication data transmitted from the transmission means to the receiving communication network. A transmission time calculating means for calculating a data transmission time from the transmission means to the receiving communication network in the uplink communication data; and the transmission time calculating means simultaneously with the upstream communication data transmission to the receiving communication network by the transmitting means. The data transmission time calculated in is set as the collision data detection time, and during the collision data detection time, there was a collision between the downlink communication data from the receiving communication network to the transmitting communication network and the uplink communication data. Collision detection means for detecting collision data; and when collision data is detected by the collision detection means, the collision data detected by the collision detection means and collision identification data for identifying the collision data are generated by the echo back generation. Means for generating return string data by adding to the echo back data by the means, and returning the returned string data to the transmission side communication network Between heterogeneous networks the communication device characterized by having a.