JP3202693B2 - Full-duplex / half-duplex automatic discriminating apparatus, discriminating method, and recording medium recording control program - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a full-duplex / half-duplex automatic discriminating apparatus, a discriminating method, and a recording medium on which a control program is recorded, and more particularly, to an Ethernet (ETHERNE).
T) The present invention relates to a full-duplex / half-duplex automatic discriminating apparatus and a discriminating method used in an apparatus, and a recording medium recording a control program.

[0002]

2. Description of the Related Art Usually, Ethernet (ETHERNE)
When configuring a network in the connection of T), 10
A device equipped with M / 100M auto negotiation and a device not equipped with an auto negotiation function are mixed. When configuring / changing the network, the communication mode is automatically set, or the communication mode is set manually.
Settings must be made in an appropriate manner for each port, and care must be taken in operation.

[0003] In particular, when it is desired to use a full-duplex mode in a device which does not have an auto-negotiation function defined in IEEE802.3u, a device having 10M / 100M auto-negotiation is opposed to a device not having the auto-negotiation function. Since the notification of the communication capability of the devices is not possible with each other, the mounted device detects the communication speed itself by using filtering etc. from the communication signal itself from the non-mounted device trying to communicate with the communication mode fixed mode A communication method is determined using a function called parallel detection.

[0004]

However, in this parallel detection operation, since only the communication speed is detected, the detection result of the communication state must be set to the half-duplex mode. Due to the provision, when performing full-duplex communication in the connection between the 10M / 100M auto-negotiation mounted device and the non-mounted device, there is a drawback that manual setting is required on the non-mounted device side.

On the other hand, an example of this type of full-duplex / half-duplex mode switching device is disclosed in Japanese Patent Laid-Open Publication No. Hei 8-265360 (hereinafter, referred to as JP-A-8-265360).
Reference 1) and JP-A-8-265534 (hereinafter referred to as Reference 2).

Document 1 discloses that a registration routine is established between a station and a concentrator port to determine a mode (full duplex or half duplex) for communicating with the concentrator port.

[0007] Reference 2 discloses switching between a half-duplex mode and a full-duplex mode in accordance with the type of data and the state of occurrence of error data.

Japanese Patent Application Laid-Open No. Hei 5-300153 (hereinafter referred to as Document 3) discloses that a terminal device transmitting an emergency packet transmits a jam signal that indicates a collision state in a pseudo manner, so that another terminal can transmit the emergency packet. A technique is disclosed in which an apparatus is placed in a state of waiting for transmission until a predetermined back-off time has elapsed.

An object of the present invention is to provide a full-duplex / half-duplex automatic discriminating apparatus having a configuration completely different from that of Reference 1.

Document 2 is completely different from the present invention in that the mode is switched according to the type of data and the state of occurrence of error data, and Document 3 is different from the present invention in that a signal is artificially transmitted. However, the purpose is completely different from that of the present invention in that “the other terminal device is set to a state of waiting for transmission until a predetermined back-off time elapses”.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a full-duplex / half-duplex in a network for transmitting data by using a common transmission path among a plurality of devices in cooperation with each other. An automatic discriminator, the full duplex / half of which
The heavy automatic discrimination device is between the PHY device and the MAC device.
A first determining unit for determining whether a transmission packet from the opposite device has been received, and the MAC device for the opposite device in accordance with a determination result by the first determining unit.
Transmitting means for transmitting a pseudo packet from the second device, and second determining means for determining whether or not data collision has occurred in the opposite device after the transmitting means has transmitted the pseudo packet. I do.

According to the first aspect, it is possible to automatically determine full / half duplex.

[0013] The second invention is a full duplex / half duplex automatic discrimination method in a network for performing to data transmission utilizing while coordinating the common transmission line among a plurality devices, P
A method provided between a HY device and a MAC device.
Ri, the MAC Device for that method the counter device in accordance with the determination result of the first process of determining whether or not the own device a transmission packet from the opposite device receives, in the first process
A second process of transmitting a pseudo packet from a chair, and a third process of determining whether data collision has occurred in the opposite device after the pseudo packet has been transmitted in the second process.
And processing.

According to the second aspect, the same effects as those of the first aspect can be obtained.

According to a third aspect of the present invention, there is provided a control for causing a computer to execute a full / half-duplex automatic discrimination method in a network for transmitting data using a common transmission path among a plurality of apparatuses in cooperation with each other. A recording medium on which a program is recorded, wherein the recording medium has a PHY device and a MAC data.
A first process for determining whether or not the own device has received a transmission packet from the opposite device;
In response to the judgment result in the processing, the MA
A second process of transmitting a pseudo packet from the C device ;
After the pseudo packet is transmitted in the second process, a control program including a third process of determining whether or not data collision has occurred in the opposite device is recorded.

According to the third aspect, the same effects as those of the first aspect can be obtained.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an outline of the present invention will be described. Normally, half-duplex communication mode and full-duplex communication mode are used on Ethernet, but in the half-duplex communication mode, transmission data and reception data cannot be transmitted at the same time on a communication line. In this case, a state called "collision" occurs, and data in that case is retransmitted after a random waiting time according to the rules shown in IEEE802.3.

On the other hand, in the full-duplex communication mode, transmission data and reception data can be transmitted simultaneously on a communication line, so that a state called collision does not occur.

Therefore, in the present invention, a function of generating a pseudo communication packet for generating a collision state with respect to a transmission packet of a communication partner is added, so that collision generation /
By monitoring and detecting non-occurrence, it is determined whether the communication function of the communication partner is full duplex or half duplex,
The configuration is such that the duplex / half duplex communication mode can be automatically set.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram showing a connection between a full-duplex / half-duplex automatic discriminating apparatus according to the present invention and an opposing apparatus.

Referring to FIG. 1, full-duplex / half-duplex automatic discriminating apparatus 1 is connected to opposing apparatus 4 via transmission (TX) line 2 and reception (RX) line. The opposite device 4 is, for example, a device on Ethernet.

Next, a first embodiment of the full / half-duplex automatic discriminating apparatus 1 will be described. Figure 2 shows full duplex / half two
FIG. 1 is a configuration diagram of a first embodiment of a heavy automatic discrimination device 1.

Referring to FIG. 2, full-duplex / half-duplex automatic discriminating device 1 makes a first determination based on a signal on RX line 3 with communication mode temporary setting unit 11 for temporarily setting a communication mode. A first determination unit 12 that performs a determination, a transmission unit 13 that transmits a predetermined signal to the TX line 2, a second determination unit 14 that performs a second determination,
A communication mode main setting section 15 for permanently setting the communication mode.

The normal half-duplex and full-duplex states will now be described. FIG. 7 is a timing chart showing a half-duplex state, and FIG. 8 is a timing chart showing a full-duplex state.

Referring to FIG. 7, since the transmission data (TXDATA) and the reception data (RXDATA) cannot be transmitted at the same time on the signal on the communication line in the half-duplex mode, the reception data is not transmitted at the same time. Monitor and control each other.

However, there is a case where data is transmitted at the same time, and a state called a collision shown in FIG. 7 is obtained. When a collision state occurs, these data are retransmitted after a random waiting time according to the rules shown in IEEE802.3.

Next, referring to FIG. 8, in the signal on the communication line in the full-duplex mode, the transmission data and the reception data can be processed independently of each other, so that the data may be transmitted at the same time. No collision state occurs as shown in FIG.

Therefore, by monitoring the collision state, it is possible to determine whether the communication partner is half duplex or full duplex on the Ethernet.

Next, the operation of the first embodiment will be described. FIG. 3 is a flowchart showing the operation of the first embodiment. This flowchart shows a sequence when a communication line is connected to establish a communication state.

Referring to FIG. 3, first, a communication state is established in half-duplex mode by communication mode temporary setting unit 11 (S).
1).

Next, the first determination unit 12 checks whether or not the own apparatus 1 has received an initial communication packet transmitted from the opposite apparatus 4 (S2). If not, the receiving operation is continued. (In the case of NO in S2), and if received, the process proceeds to S3 (in the case of YES in S2).

When the first determining unit 12 determines that the own device 1 has received the initial communication packet transmitted from the opposing device 4, the transmitting unit 13 transmits a pseudo packet for collision generation (S3). .

Next, the second determination section 14 determines whether or not a collision has occurred (S4). When the collision is detected by the second determination unit 14 (YES in S4), the communication mode main setting unit 15 sets the main mode to the half-duplex mode (S5).

The collision signal (COL) indicating the collision state is input from the opposing device 4 to the second determination unit 14 via the RX line 3 as an example.

Thus, the communication state continues in the half-duplex mode. Next, a transition is made to a normal communication state (S6).

On the other hand, if no collision is detected by the second determination section 14 (NO in S4), the communication mode main setting section 15 sets the full-duplex mode (S4).
8).

Thus, a communication state is established in the full duplex mode. Next, a transition is made to a normal communication state (S6).

When a pseudo packet for collision generation is generated, a loss of an initial communication packet transmitted from the opposite device 4 occurs. However, a slight loss is generally recovered by processing such as retransmission by a higher-level protocol. However, there is no problem by limiting the number of generated pseudo packets for initial collision generation.

Next, a second embodiment will be described. In the second embodiment, 10M / 100M auto negotiation (n) defined in IEEE802.3u
negotiation (negotiation) function by using this full duplex / half
It relates to the case where it is used together with the double automatic discrimination function.

That is, by adding the full-duplex / half-duplex automatic discrimination function of the present invention to the operation when the communication state is established by the parallel detection operation, not only the half-duplex mode is set but also the full-duplex mode. You can set up to duplex mode.

FIG. 4 is a configuration diagram of the second embodiment.
Referring to FIG. 4, own device 21 includes this device 22 and PHY
(Physical layer protocol)
A device 23 and a MAC (media access)
(control) device 24.

The apparatus 22 has a full / half-duplex automatic discriminating apparatus 1 and a PHY control 25.

Further, the PHY device 23 is an IEEE8
Equipped with a 10M / 100M auto-negotiation and an MII interface indicated by
The AC device 24 has an MII interface.

On the other hand, the opposing device 31 facing the own device 21
Are connected via a transmission line 41.

The opposite device 31 is a PHY device 32
And a MAC device 33. However, it is assumed that the opposing device 31 does not have a 10M / 100M auto-negotiation function.

That is, the own device 21 has a 10M / 100M auto-negotiation function, and the opposing device 31 does not have this function.

FIG. 4 shows that when a collision is detected by the opposing device 31, the collision state signal COL is transmitted to the transmission line 41.
Is input to the own device 21 via the RX line therein, and is further determined through the PHY device 32 in the own device 21.
And to the MAC device 33.

Here, the relationship between the PHY device 32 and the MAC device 33 will be described. PHY device 32 connected by MII interface as shown in FIG.
And the MAC device 33 transmit and receive data to and from each other through signal lines of transmission data TXD and reception data RXD.

When the PHY device 32 is in the half-duplex mode during data transmission / reception, when the transmission data TXD and the reception data RXD collide, a collision state is indicated in the COL signal, and the PHY device 32 transmits the data to the MAC device. 33 is notified.

Further, signals for controlling the operation mode of the PHY device 32 include MDIO and MDC signals, and the operation mode of the PHY device 32 can be changed / confirmed from the MAC device 33 side.

In the case of the present invention, the device 22 is connected between the PHY device 32 and the MAC device 33.

By connecting the device 22 in this way, the status of the PHY device 32 is changed by the device 22 to the MDIO.
And monitoring each signal of the MDC. Auto-Ne in the flowchart of FIG.
g The state at the time of failure can also be known.

Further, the reception data RXD and the transmission data T
Since XD is connected to the present apparatus 22, Auto-N
As operations after the failure of the eg, the communication state is established in the half-duplex mode, the generation of the collision generation packet on the transmission data TXD line, and the presence or absence of the collision state by the collision signal COL can be known. The state of half duplex can be confirmed and set.

When the 10M / 100M auto-negotiation mounted device 21 and the non-mounted device 31 face each other, it is not possible to notify their own communication capabilities, and therefore the mounted device 21 has a fixed communication mode. A communication method is determined by using a function called parallel detection for detecting a communication speed by using filtering or the like from a communication signal from the non-mounted device 31 to communicate with as it is.

However, in this parallel detection operation, since only the communication speed is detected as described above, the detection result of the communication state is limited to the half-duplex mode.
EE802.3 also defines such.

However, by applying the function operation of the present invention after determining the communication speed after the parallel detection operation as shown in the flowchart of FIG.
Automatic setting of a half-duplex / full-duplex communication mode is possible even in the case of opposition to a device having no 100M auto-negotiation 31.

Next, the operation of the second embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing the operation of the second embodiment.

First, a communication line between the own device 21 and the opposing device 31 is connected (S11). Next, in the own device 21 and the opposing device 31, auto negotiation (hereinafter, referred to as auto negotiation)
Auto-Neg is displayed) (S12).

By the way, as described above, the own device 21 has a 10M / 100M auto-negotiation function,
The opposing device 31 does not have this.

Therefore, the Auto-Neg operation fails (NO in S13), and the parallel detection operation is started (S14). Subsequently, the half duplex mode of the detected communication speed is set (S15).

Since the subsequent processes S1 to S6 have already been described, the description will be omitted.

On the other hand, if the Auto-Neg operation is successful (YES in S13), that is, if both the own device 21 and the opposing device have the 10M / 100M auto-negotiation function, the communication mode is set based on the communication information. (S16). Then, the state shifts to a normal communication state (S6).

Next, a third embodiment will be described. FIG. 6 is a configuration diagram of the third embodiment. The third embodiment relates to a recording medium and a driving device for driving the recording medium.

Referring to FIG. 6, drive device 51 includes a CPU.
(Central processing unit), input device 53, storage device 54
, An output device 55, and a full / half-duplex automatic discrimination device 1.

The control program of the full / half-duplex automatic discrimination method is recorded on the recording medium 56. In particular,
A control program shown in the flowcharts of FIGS. 3 and 5 is recorded.

Next, the operation of the driving device 51 will be described. When a program load instruction is input to the CPU 52 from the input device 53, the CPU 52
Is read, and the read control program is written in the storage device 54.

Next, when a program run command is input from the input device 53 to the CPU 52, the CPU 52 reads the control program recorded on the recording medium 56, and performs full-duplex / half-duplex automatic discrimination according to the control program. The device 1 is controlled.

The description of the control contents of the full / half-duplex automatic discriminating apparatus 1 has been described above and will not be repeated. The output device 55 displays the currently established communication mode as an example.

[0069]

According to the first aspect of the present invention, there is provided a full-duplex / half-duplex automatic discriminating apparatus in a network for performing data transmission using a common transmission path among a plurality of apparatuses in cooperation with each other. The double / half-duplex automatic discrimination device determines whether or not the own device has received a transmission packet from the opposite device.
Determining means, and transmitting means for transmitting a pseudo packet to the opposite device according to the determination result of the first determining means,
Since the transmitting means includes a second determining means for determining whether or not data collision has occurred in the opposite device after transmitting the pseudo packet, the full / half-duplex automatic determination is performed. It becomes possible.

According to a second aspect of the present invention, there is provided a full-duplex / half-duplex automatic discrimination method in a network for performing data transmission using a common transmission path among a plurality of devices in cooperation with each other. A first process of determining whether or not the own device has received a transmission packet from the opposite device; a second process of transmitting a pseudo packet to the opposite device according to a determination result in the first process; Since the second process includes the third process of determining whether or not data collision has occurred in the opposite device after the pseudo packet has been transmitted in the second process, the same effect as in the first invention is obtained. Play.

According to the third aspect of the present invention, a computer can execute a full-duplex / half-duplex automatic discrimination method in a network in which data transmission is performed by using a common transmission path among a plurality of devices in cooperation. A first process for determining whether or not the own device has received a transmission packet from an opposite device on the recording medium, and according to a determination result in the first process. A second process of transmitting a pseudo packet to the opposing device, and a third process of determining whether data collision has occurred in the opposing device after the pseudo packet has been transmitted in the second process. Since the control program including the control program is recorded, the same effect as that of the first invention can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a connection between a full-duplex / half-duplex automatic discriminating apparatus according to the present invention and an opposing apparatus.

FIG. 2 is a configuration diagram of a first embodiment of a full-duplex / half-duplex automatic discriminating apparatus 1;

FIG. 3 is a flowchart showing an operation of the first embodiment.

FIG. 4 is a configuration diagram of a second embodiment.

FIG. 5 is a flowchart showing an operation of the second embodiment.

FIG. 6 is a configuration diagram of a third embodiment.

FIG. 7 is a timing chart showing a half-duplex state.

FIG. 8 is a timing chart showing a full duplex state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Full-duplex / half-duplex automatic discriminating apparatus 2 Transmission line 3 Receiving line 11 Temporary communication mode setting unit 12 First judging unit 13 Transmitting unit 14 Second judging unit 15 Communication mode main setting unit 21 Own device 22 This device 23 PHY Device 24 MAC device 25 PHY control 56 Recording medium

Claims (21)

(57) [Claims] 1. A network for transmitting data by using a common transmission path among a plurality of devices in cooperation with each other.
A double / half-duplex automatic discriminating device, which is provided between a PHY device and a MAC device, and which determines whether or not a transmission packet from an opposite device has been received.
Determining means, transmitting means for transmitting a pseudo packet from the MAC device to the opposing device according to the result of the judgment by the first determining means, and transmitting the pseudo packet to the opposing device after the transmitting means transmits the pseudo packet. And a second determining means for determining whether or not data collision has occurred. 2. The apparatus according to claim 1, wherein when the first determination unit determines that the own device has received the transmission packet, the transmission unit transmits the pseudo packet to the opposite device. Full-duplex / half-duplex automatic discriminating apparatus as described. 3. A first mode setting means for temporarily setting a communication state between the opposing device and the own device to a half duplex mode, and a communication mode between the opposing device and the own device in a full duplex mode. And a second mode setting means for permanently setting the mode to one of a half-duplex mode, wherein the processing by the first determining means is performed next to the processing by the first mode setting means, and the processing by the second determining means. 3. The full-duplex / half-duplex automatic discriminating apparatus according to claim 1, wherein a process by the second mode setting means is performed after the second mode setting. 4. When the second determining means determines that data collision has occurred in the opposing device, the communication mode between the opposing device and the own device is reduced by half by the second mode setting means. The full-duplex / half-duplex automatic discriminating apparatus according to claim 3, wherein the full-duplex mode is set. 5. When the second determining means determines that no data collision has occurred in the opposing device, the communication state between the opposing device and the own device is completely set by the second mode setting means. 4. The full / half-duplex automatic discriminating apparatus according to claim 3, wherein the main mode is set to a double mode. 6. The full-duplex / half-duplex automatic discrimination is performed in combination with an auto-negotiation function between the opposing device and the self-device. Full / half-duplex automatic discriminator. 7. The full-duplex / half-duplex automatic discriminating apparatus according to claim 1, wherein the network is an Ethernet. 8. A network for transmitting data by using a common transmission path among a plurality of devices in cooperation with each other.
A double / half-duplex automatic discrimination method, which is provided between a PHY device and a MAC device.
A first process of determining whether or not the own device has received a transmission packet from the opposite device; and, from the MAC device to the opposite device in accordance with a determination result in the first process.
And a third process of determining whether or not data collision has occurred in the opposite device after the pseudo packet has been transmitted in the second process. Characteristic full / half-duplex automatic discrimination method. 9. The method according to claim 1, wherein, when it is determined in the first processing that the own apparatus has received the transmission packet, the pseudo packet is transmitted to the opposite apparatus in the second processing. 8. The full / half-duplex automatic discrimination method according to 8. 10. A fourth process for temporarily setting a communication state between the opposite device and the own device to a half duplex mode, and a communication process between the opposite device and the own device to a full duplex mode and a half duplex mode. And a fifth process for permanently setting the mode to one of the dual modes, wherein the first process is performed after the fourth process, and the fifth process is performed after the third process. The full / half-duplex automatic discrimination method according to claim 8 or 9. 11. When the third process determines that data collision has occurred in the opposed device, the communication status between the opposed device and the own device is changed to a half-duplex mode by the fifth process. 11. The full-duplex / half-duplex automatic discrimination method according to claim 10, wherein the setting is made. 12. When the third process determines that no data collision has occurred in the opposing device, the communication status between the opposing device and the own device is changed to a full duplex mode by the fifth process. 2. The method according to claim 1, wherein
0 full-duplex / half-duplex automatic discrimination method. 13. The apparatus according to claim 1, further comprising an auto-negotiation function between said opposing device and said own device.
13. A half-duplex automatic discrimination is performed.
Full-duplex / half-duplex automatic discrimination method according to any of the above. 14. The full-duplex / half-duplex automatic discrimination method according to claim 8, wherein the network is an Ethernet. 15. A recording medium on which a control program for causing a computer to execute a full / half-duplex automatic discrimination method in a network for performing data transmission using a common transmission path among a plurality of devices while cooperating with each other is recorded. A first process that is provided between the PHY device and the MAC device and that determines whether or not the own device has received a transmission packet from the opposite device; and the first process that is performed in accordance with a determination result in the first process. A second process of transmitting a pseudo packet from the MAC device to the device, and a second process of determining whether data collision has occurred in the opposite device after the pseudo packet has been transmitted in the second process. A recording medium on which a control program including three processes is recorded. 16. The pseudo-packet is transmitted to the opposite device in the second process when it is determined in the first process that the own device has received the transmission packet. 16. The recording medium according to item 15. 17. A fourth process for temporarily setting a communication state between the opposite device and the own device to a half duplex mode, and a communication process between the opposite device and the own device to a full duplex mode and a half duplex mode. And a fifth process for permanently setting the mode to one of the dual modes, wherein the first process is performed after the fourth process, and the fifth process is performed after the third process. A recording medium according to claim 15. 18. When the third process determines that data collision has occurred in the opposed device, the fifth process changes the communication state between the opposed device and the own device to a half-duplex mode. 18. The recording medium according to claim 17, wherein said setting is made. 19. When the third process determines that no data collision has occurred in the opposing device, the communication status between the opposing device and the own device is changed to a full duplex mode by the fifth process. 2. The method according to claim 1, wherein
7. The recording medium according to 7. 20. Further, the full duplex / duplex is used together with an auto negotiation function between the opposing device and the own device.
2. A method according to claim 1, wherein a half-duplex automatic discrimination is performed.
10. The recording medium according to any one of 9 above. 21. The recording medium according to claim 15, wherein said network is an Ethernet.