KR100192522B1 - Method and apparatus of automatic negotiation for sensing function for break in a line - Google Patents

Abstract

The present invention relates to data communication, and when a transmission line for transmitting data in a local area network (LAN) is disconnected, an automatic negotiation device having a disconnection detection function suitable for detecting disconnection without adding an analog circuit and a disconnection detection method using the same It is to provide.

The automatic negotiation apparatus of the disconnection detection function of the present invention receives the information about itself from the status register of the management and outputs the information to the following automatic transmission unit, and fast the link code word (LCW) received from the adjustment unit. An automatic transmitter for transmitting a link link in the form of a fast link pulse, an automatic receiving and restoring unit for restoring a link code word of the other party from a fast link pulse (FLP) received from the link partner, the adjusting unit, and automatic transmission And a disconnection detector for detecting whether a transmission line and a reception line are disconnected by receiving the respective signals from the automatic reception and restoration unit and outputting a disconnection signal.

Description

Automatic negotiation device of disconnection detection function and disconnection detection method using the same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data communication. In particular, when a transmission line for transmitting data in a local area network (LAN) is disconnected, an automatic negotiation device having a disconnection detection function suitable for detecting disconnection without adding an analog circuit and disconnection using the same It relates to a detection method.

In general, a local area network (LAN) refers to a data communication network in a contiguous geographical range, and is generally called a packet communication network.

Such local area networks perform broadband communications using cheap transmission media. In terms of its function, unlike the wide area network, communication in an office or a factory can be performed efficiently and economically.

In general, the area of application of local area network is 0.1 ~ 10km and the transmission speed is 0.1 ~ 100Mbps.

In general, auto-negotiation means that the communication mode between the two terminals exchanges the operation mode (for example, 10Mbps or 100Mbps) and their own operation mode with Fast Link Pulse (FLP). By comparing the operation mode of the own operation mode is to set.

Hereinafter, a conventional auto negotiation device will be described with reference to the accompanying drawings.

1 is a block diagram of a conventional automatic negotiation apparatus.

First, the conventional automatic negotiation apparatus includes an adjusting unit 1, an automatic transmitting unit 2, an automatic receiving and restoring unit 3, as shown in FIG. The automatic transmission unit 2 transmits the link code word LCW received from the adjustment unit 1 in the form of a fast link pulse. The automatic receiving and restoring unit 3 restores the link code word of the other party from the fast link pulse FLP received from the other party. And the adjusting unit 1 controls the automatic transmitting unit 2 and the automatic receiving and restoring unit 3.

Operation of the conventional automatic negotiation device is as follows.

That is, as shown in FIG. 1, the adjusting unit 1 has its own information from the state register of the management (for example, whether its operation mode is 100 Mbps, 10 Mbps, or 100-base-T or 100-base-Tx). Information such as recognition).

The adjusting unit 1 transmits the information received from the status register to the automatic transmitting unit 2. The automatic transmitter 2 transmits this information (link code word) in the form of a fast link pulse. In this case, the fast link pulse form refers to a total of 33 pulse forms in which clock pulses and link code pulses are alternately transmitted by 1 bit. When the fast link pulse information is received from the other party, the other party (Link parner) sets the acknowledgment bit of the received information among the bits of its link code word and transmits it to the local device.

The local device receiving the acknowledgment bit of the received information sets the received information acknowledgment bit among the bits of its link code word to 1 and transmits it to the link partner again. When this process is repeated several times, each of the information transmitting and receiving terminals compares the link code word of the information with the link code word of the counterpart and determines the operation mode based on the priority of the operation modes of the counterpart and the counterpart. .

The conventional auto-negotiation device as described above has the following problems. That is, a separate analog circuit is required for disconnection detection of the transmission line and the reception line, which complicates the circuit configuration and the disconnection detection.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides an autonegotiation device having a disconnection detection function suitable for detecting disconnection of a transmission line and simplifying a circuit configuration by adding a simple digital logic for disconnection detection of a transmission line. There is a purpose.

1 is a block diagram of a conventional automatic negotiation apparatus.

2 is a block diagram of an automatic negotiation apparatus for disconnection detection of the present invention.

3A to 3B are diagrams illustrating a disconnected state of a transmission / reception line for explaining the present invention.

4 is a state diagram of an automatic negotiation apparatus for explaining the present invention.

5 is a block diagram of a disconnection detecting unit according to the present invention.

6 is a state diagram of an automatic receiving and restoring unit for explaining the present invention.

7 is a flowchart showing a disconnection detection method of a transmission line according to the present invention.

8 is a flowchart illustrating a disconnection detection method of a reception line according to the present invention.

* Explanation of symbols for main parts of the drawings

21: adjustment unit 22: automatic transmission unit

23: automatic receiving and restoring unit 24: disconnection detecting unit

31: Local device 32: Link partner

51: timer unit 52: disconnection line determination unit

Automatic negotiation device of the disconnection detection function of the present invention for achieving the above object receives an information about itself from the status register of the management and outputs it to the following automatic transmission unit, and the link code word received from the adjustment unit An automatic transmitter for transmitting the LCW in a fast link pulse form through a transmission line, and an automatic receiver and restorer for restoring the link code word of the other party from the fast link pulse received from the link partner. And a disconnection detector for detecting whether the transmission line and the receiving line are disconnected by receiving the respective signals from the adjusting unit, the automatic transmission unit, and the automatic receiving and restoring unit, and outputting the disconnection signal. When the operation in the negotiation mode is started, the disconnection determining unit determines the state-information and transmits the determination result. A step of starting a disconnection detection operation of an phosphorus or performing a normal operation and determining a setting value of a reception information acknowledgment bit, and if the reception information acknowledgment bit is 0, the disconnection detection unit starts counting and sets the reception information acknowledgment bit to zero. If not, the step of performing a normal operation and the step of starting the count in the disconnection detection unit, and comparing the count value with the reference value if there is a difference compared to the reference value, the step of generating a signal indicating that the transmission line is disconnected It is done.

Hereinafter, with reference to the accompanying drawings, the automatic negotiation apparatus of the disconnection detection function of the present invention and the disconnection detection method using the same will be described.

2 is a block diagram of an automatic negotiation apparatus for disconnection detection according to the present invention.

First, the automatic negotiation apparatus of the disconnection detecting function of the present invention includes an adjusting unit 21, an automatic transmitting unit 22, an automatic receiving and restoring unit 23, and a disconnection detecting unit 24 as shown in FIG. . Here, the adjusting unit 21 receives information about itself from the status register of the management and outputs it to the automatic transmitting unit 22 again. The automatic transmitter 22 transmits the link code word LCW received from the controller 21 in the form of a fast link pulse. The automatic receiving and restoring unit 23 restores the link code word of the other party from the fast link pulse FLP received from the other party. The adjusting unit 21 controls the automatic transmitting unit 22 and the automatic receiving and restoring unit 23.

On the other hand, the disconnection detecting unit 24 receives the respective signals from the adjusting unit 21, the automatic transmitting unit 22, and the automatic receiving and restoring unit 23, detects whether the transmission line and the receiving line are disconnected, and outputs a disconnection signal. .

3A to 3B are diagrams showing unity states of data transmission lines and receiving lines between two terminals for explaining the present invention. First, FIG. 3a illustrates a case where the transmission line is disconnected, and FIG. 3b illustrates a case where the reception line is disconnected.

Operation of the automatic negotiation apparatus of the disconnection detection function of the present invention is as follows.

As shown in FIGS. 2 to 3, the automatic transmitter 22 transmits the link code word LCW received from the controller 21 in the form of a fast link pulse. The automatic receiving and restoring unit 23 restores the link code word of the other party from the fast link pulse FLP received from the other party. The adjusting unit 21 controls the automatic transmitting unit 22 and the automatic receiving and restoring unit 23. In this case, when a transmission line or a reception line is disconnected during such information transmission, the communication protocol will be described as follows.

First, as shown in FIG. 3A, the communication protocols of both terminals, that is, the local device 31 and the link partner 32, before disconnection of the transmission line and the reception line are as follows. The local device 31 transmits the link code word (16 bit word containing the operation mode) in the form of a fast link pulse (FLP). At this time, the link partner 32 sets the received information acknowledgment bit of the link code word (i.e., a bit indicating that the link code word corresponding to the content has been received from the other party, ignoring three consecutive received information acknowledgment bits). Set to. At this time, the local device 31 ignores the received information acknowledgment bit from the other party (link partner), that is, when receiving the same link code word three times in succession, the local device 31 sets the received information acknowledgment bit to 1 to link code word. Is transmitted in the form of a fast link pulse.

Thereafter, the link code word 31 continuously receives the link code word having the same contents including the reception information acknowledgment bit from the link partner 32 three times in succession. Subsequently, the local device 31 transmits a link code word of which the reception information acknowledgment bit is set to 1 about 6 to 8 times. Then, the local device 31 stops the transmission of the link code word being transmitted and sets the operation mode.

Such a series of processes is sequential, and if any of these are not satisfied, it cannot proceed to the next process.

Referring to FIG. 3 and FIG. 4, the operation when a portion of the data transmission and reception line between the terminals operating through this process is disconnected will be described as follows.

3 is a diagram illustrating a state in which a transmission line and a reception line between both terminals are disconnected, and FIG. 4 is a state diagram of an auto negotiation adjustment unit of the auto negotiation apparatus.

First, as shown in FIG. 3A, when the transmission line is disconnected, the local device 31 initially transmits a link code word, which is a 16-bit word containing an operation mode, to the fast link pulse. Therefore, the link partner 32 sets the reception information acknowledgment bit of the link code word to zero.

Since the transmission line is disconnected, only the above process is repeated. Since the link partner 32 has no data transmitted from the local device 31, the link partner 32 continuously transmits only the link code word having the reception information acknowledgment bit set to 0 to the local device 31.

This remains only in the D state, that is, the reception information acknowledgment bit detection state, as shown in FIG. Because as mentioned above, the local device must receive the link link word of the same content three times in a row including the acknowledgment bit from the link partner, because the transmission line is disconnected. This is because only the link partner whose reception information acknowledgment bit is set to 0 is transmitted to the local device.

As a result, in order to measure the disconnection of the transmission line, as shown in FIG. 2, the ACK signal, the reception code input signal, and the signal STATE INFO 3: 0 must be received from the adjusting unit. Here, the ACK signal indicates a received information acknowledgment bit of the link partner, and the received code input signal is a signal indicating that the auto-receive and restore unit has received one code word from the link partner. In addition, the state info signal is a signal indicating the state that the auto-negotiation control unit currently stays.

As such, when the disconnection detection unit receives these three signals, the following operation is performed.

5 is a detailed view of the disconnection detecting unit according to the present invention.

The disconnection detecting unit according to the present invention includes a timer unit 51 and a disconnection line determination unit 52 as shown in FIG. Here, the timer 51 counts a signal indicating the number of link code words in which the reception information acknowledgment bit is zero. The disconnection line determination unit 52 checks whether the state information 3: 0 mentioned above is applied three times, and then increments the counter by +1 when the reception information acknowledgment bit satisfies zero. When the value of the counter is greater than or equal to a specific value, the disconnection line determination unit 52 outputs a signal that the transmission line is disconnection.

The case where the transmission line is disconnected has been described above, and the case where the reception line is disconnected will now be described with reference to FIGS. 3B and 6.

6 is a state diagram of an automatic receiving and restoring unit according to the present invention.

First, FIG. 3b illustrates a case where the receiving line between both terminals is disconnected. That is, as shown in FIG. 3B, even when the receiving line is disconnected, the local device sends a link code word, which is a 16-bit word containing an operation mode, to the fast link pulse in the same manner as when the transmitting line is disconnected.

Therefore, the link partner sets the reception information acknowledgment bit of the link code word to zero. At this time, since the receiving line is disconnected, there is no data input to the automatic receiving and restoring unit of the local device. This remains in the IDLE state shown in the state diagram of the automatic reception and restoration section of FIG. This suggests that the state of the adjusting portion of the auto negotiation apparatus is in the C state.

However, considering that an instantaneous link code pulse may be generated by an unwanted signal or an unexpected operation at the receiving end of the automatic receiving recovery unit, the automatic receiving and restoring unit does not necessarily stay in the IDLE state and may remain in the link pulse detection state. none. Here, even if the link pulse detection state is maintained, the link pulse detection unit does not stay there. This may move to the link pulse count state or the IDLE state depending on the condition of escape from the link pulse detection state shown in FIG.

Here, moving to the link pulse count state means that the receiving line is not disconnected. In case of moving to IDLE state, two conditions exist. That is, when the link pulse does not come in within the desired time of the first condition among the conditions shown in FIG. 6 and the link pulse of the second condition comes in before a certain point, the IDLE state is applied to the two cases. Will move. As a result, when the receiving line is disconnected, the state transfer of the automatic receiving and restoring unit is performed as follows. IDLE? Link pulse detection? IDLE? Link pulse detection. It is made of

It should be noted that the first condition and the second condition are used when moving from the link pulse detection state to the IDLE state. If the second condition is satisfied and the IDLE state is moved, the reception line is not disconnected. This is because the receiving end of the automatic receiving and restoring unit continuously receives the link pulse.

Therefore, the IDLE state determines whether the movement to the IDLE state again by the second condition is greater than or equal to the allowable value or less than the allowable value and generates a signal to start the receiving line disconnection detection to the disconnection detecting unit.

The signal to start detecting the disconnection of the reception line operates the detection timer for one day. At this time, the signals of the end timer and the rst timer are set to 1 for the normal operation of the detection timer. If the signal to start the reception line disconnection detection is 1 even after the detection timer is operated until the signal of the end timer becomes 1, the detection line is detected as disconnected.

7 and 8 are flowcharts illustrating a disconnection detection method using an automatic negotiation device having a disconnection detection function according to the present invention.

First, FIG. 7 is a flowchart illustrating a disconnection detection method according to a transmission line disconnection.

As shown in FIG. 7, when the operation in the auto-negotiation mode is started 101, the disconnection determining unit determines whether state-information 3: 0 = 3 (102). As a result of the determination, if state-information 3: 0 = 3, the disconnection detection operation of the transmission line is started 103, and if not, the normal operation is performed.

Subsequently, it is determined whether the reception information acknowledgment bit is set to zero (104). If the reception information acknowledgment bit is zero, the disconnection detection unit starts counting 105, and if the reception information acknowledgment bit is not set to zero, normal operation is performed. Do this. When the count is detected by the disconnection detector 105, the count value is compared with the reference value 106, and when the count value is greater than the reference value, a signal indicating that the transmission line is disconnected is generated 107.

If the count value of the disconnection detector is smaller than the reference value, it is determined 108 again whether the state info 3: 0 = 3, and if it is not 3, normal operation is performed. If 3, the acknowledgment bit value of the received information is checked. 104).

8 is a flowchart illustrating a receiving line disconnection detecting method according to the present invention. As shown in FIG. 8, it is determined whether a link code word has been received from the link partner (201). If the link code word is not received, normal operation is performed. If the link code word is received from the link partner, state-info = 2 is determined (202). If the determination result is 2, the signal to start disconnection detection of the reception line is set to 1 and transmitted to the disconnection detection unit. At the same time, the disconnection detection timer is operated (203). Next, by comparing the signal for starting the disconnection detection of the reception line with the value of the disconnection detection timer, it is detected whether the signal for starting the reception line disconnection detection is 1 until the signal 1 of the timer is operated after the detection timer is operated. If it is still 1, a signal indicating that the receiving line is disconnected is output.

Through this process, whether the transmission line and the reception line are disconnected is detected.

As described above, the apparatus and method for detecting disconnection of a transmission line of the present invention have the following effects. That is, to detect the disconnection of the transmission line and the reception line, the disconnection of the transmission line and the reception line is detected only by a simple digital circuit without adding a separate complicated analog circuit.

Claims (7)

The controller receives information about itself from the status register of the management and outputs the information to the following automatic transmitter. The link code word (LCW) received from the controller is transmitted through a transmission line in the form of a fast link pulse. An automatic transmission unit, an automatic reception and restoration unit for restoring the link code word of the other party from the fast link pulse (FLP) received from the link partner, and a transmission line receiving the respective signals from the adjustment unit, the automatic transmission unit, and the automatic reception and restoration. And a disconnection detection unit for detecting a disconnection of a receiving line and outputting a disconnection signal. The reception circuit of claim 1, wherein the disconnection detection unit checks whether a timer unit for counting a signal indicating a number of link code words having a reception information acknowledgment bit is 0, and whether the state information has been applied a predetermined number of times, and then receiving When the information acknowledgment bit satisfies 0, it comprises a disconnection line determining unit for increasing the value of the counter by +1 and comparing it with a specific value and outputting a signal indicating that the transmission and reception lines are disconnected according to the result. Automatic negotiation device with disconnection detection function. When the operation in the auto-negotiation mode is started, the disconnection determination unit determines the state-info, starts the disconnection detection operation of the transmission line or performs the normal operation, and sets the received information acknowledgment bit. Determining that the received information acknowledgment bit is 0, the disconnection detecting unit starts counting, and if the receiving information acknowledgment bit is not set to 0, performing a normal operation; and counting the count value as the disconnection detecting unit starts counting. And a step of generating a signal informing that the transmission line is disconnected when there is a difference compared to the reference value. 4. The method of claim 3, wherein if the count value of the disconnection detection unit is smaller than the reference value, the step of re-determining whether or not the state info 3: 0 = 3 is performed; if the determination result is not 3, normal operation is performed; Disconnection detection method using an automatic negotiation device having a disconnection detection function, characterized in that it further comprises the step of feeding back to the step of confirming the approval bit value. 4. The disconnection detection method according to claim 3, wherein the disconnection determination unit determines the state-info and starts the disconnection detection operation if it is 3. A step of determining whether a link code word has been received from a link partner, performing a normal operation and determining a state-info according to the reception, and a signal for starting disconnection detection of a reception line according to a result of the state info determination Transmitting the signal to the disconnection detection unit and simultaneously operating the disconnection detection timer; and comparing the signal for starting the disconnection detection of the reception line with the value of the disconnection detection timer and indicating a signal indicating that the reception line is disconnected according to the result. A disconnection detection method using an auto-negotiation device having a disconnection detection function, comprising a step of outputting. 7. The disconnection detection method according to claim 6, wherein if the link code word is received, it is determined whether the state info is 2.