JPH04239838A - Network reconstitution request processing system - Google Patents

Abstract

PURPOSE:To quicken the transfer of a network reconstitution request signal in a node during data transmission with respect to the processing system of the network reconstitution request signal in each of nodes of a ring network. CONSTITUTION:In a ring network in which a transmission reception control section 1 controlling data transmission reception with a network and a data processing section 2 making data transmission reception via the transmission reception control section 1 are provided and plural nodes sending/receiving a data via a reception line 7 and transmission line 8 are arranged in a ring, the transmission reception control section 1 is provided with a network reconstitution request detection means 3 to detect a network reconstitution request signal inputted from the reception line 7 and a changeover means 4 which connects an internal transmission line 10 from the data processing section 2 normally to the transmission line 8, interrupts the internal transmission line 10 and the transmission line 8 when the network reconstitution request detection means 3 detects a head of the network reconstitution request signal to connect the reception line 7 to the transmission line 8 and connects the internal transmission line 10 to the transmission line 8 again when the end of the network reconstitution request signal is detected.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing network reconfiguration request signals at each node of a ring network. As shown in FIG. 7, the target network of the present invention is a ring network (loop network) 20 in which a plurality of nodes 21 are arranged in a ring and connected by transmission paths, but the ring network is usually duplicated. When a failure occurs or during a test, part or all of the network is switched to a backup transmission path (not shown) and the network is reconfigured. [0002] Network reconfiguration is performed, for example, when the transmission right signal circulating within the network is not received for a certain period of time, when errors occur frequently, or when it is desired to switch networks for testing purposes. First, a node with a high priority in the network, a node that has detected a high number of errors, or a node that is executing a test issues a network reconfiguration request signal requesting network reconfiguration. The fault location is determined through a series of steps, and the network is reconfigured by switching to remove the fault location. For example, if the node N1 in FIG. After going around N2 to Nn, the receiving transmission line 8
If it is confirmed that the network reconfiguration request signal is received by the node N1, or if it is confirmed that the signal does not return to the node N1 within a certain period of time, the process moves on to the next step. During this time, the node N1 repeatedly sends out the network reconfiguration request signal at certain intervals. Furthermore, each node that receives the network reconfiguration request signal transfers it to the next node, temporarily suspends transmission rights monitoring processing and data transmission/reception related processing, and enters a standby state. [0004] As described above, when a network reconfiguration request signal is issued, the network is in a state where no communication is performed until a series of processing is completed, so each node that receives the network reconfiguration request signal receives the signal as soon as possible. It is necessary to transfer the network reconfiguration request signal to the next node. 2. Description of the Related Art FIG. 8 is a block diagram of the prior art, and FIG. 9 is a time chart of the prior art. In a ring network, it is common to control data transmission and reception using transmission rights (generally called "tokens"), but this method requires each node to circulate and transmit a signal to acquire the transmission right. When a certain node receives this transmission right signal, it obtains the transmission right and transmits data. FIG. 8 shows the configuration of the control signal and data transmission/reception related parts of the node, including a transmission/reception control section 31 that controls data transmission/reception with the network;
A data processing section 32 is shown that transmits and receives data via the . It should be noted that the data processing section 32 is connected to input/output devices, etc., which input data to the data processing section 32 and output the results processed by the data processing section 32, but are not shown. [0007] The above-mentioned transmission/reception control unit 31 is generally called a "media access controller (MAC)", and is responsible for processing the transmission right signal, for the data processing unit 32 to transmit data from its own node using the transmission right, and for other purposes. When receiving data from a node, an internal control circuit 33 controls transmission and reception of signals and data to and from the network. When the own node obtains the transmission right, the transmission control section 34 of the data processing section 32 transfers the data held in the transmission data holding section 35 to the transmission transmission path 8 via the internal transmission transmission path 37 and the transmission/reception control section 31.
Send to. Further, data received from other nodes is transmitted from the reception transmission path 7 to the data processing unit 3 via the transmission/reception control unit 31.
2 and processed. Now, assume that the node in FIG. 8 receives the network reconfiguration request signal from the reception transmission path 7 while not transmitting data. In this case, the network reconfiguration request signal is input to the data processing unit 32 via the transmission/reception control unit 31 and the internal reception transmission line 36, and is transmitted via the internal transmission transmission line 37 and the transmission/reception control unit 31 under the control of the transmission control unit 34. Transmission line 8
will be sent to. At this time, the transmission control unit 34 performs a prescribed process upon receiving the network reconfiguration request signal, but since this is not directly related to the present invention, detailed explanation will be omitted. Next, a case will be described in which the node in FIG. 8 receives the network reconfiguration request signal while transmitting data. Although FIG. 9 shows a time chart of this state, FIG. 8 will be explained below using FIG. 9 as well. Note that ■ to ■ in FIG. 8 indicate locations where the time chart is illustrated in FIG. 9. During data transmission, as shown in (1) and (2) in FIG.
has been sent to. On the other hand, the network reconfiguration request signal is
As shown in FIG. 3, the signal is repeatedly input from the reception transmission path 7 until the originating node confirms that the network reconfiguration request signal has returned or a timeout occurs. In the prior art, even if a network reconfiguration request signal is input, a node that is transmitting data is supposed to transfer the network reconfiguration request signal to the next node after completing data transmission. The first network reconfiguration request signal (1) is sent to the data processing unit 32 via the internal reception transmission path 36 (
(see FIG. 9), disappear without being processed. FIG. 9 shows the second network reconfiguration request signal (2)
This example shows an example in which data transmission ends while data is being received. As shown in the figure, when the data transmission is completed, the transmission control unit 34 of the data processing unit 32 sends the data transmission completion notification (■) to the transmission/reception control unit 31, and also sends the network reconfiguration request signal ( 2) is returned to the transmission transmission path 8 via the transmission/reception control unit 31. However, the network reconfiguration request signal (2) may be incomplete as shown in Figure 9, and a complete network reconfiguration request signal is transferred only in the next network reconfiguration request signal (3). . As described above, in the prior art, when there is a node that is transmitting data, the network reconfiguration request signal is not transferred until the data transmission is completed, so it takes time for the network reconfiguration request signal to return to its source. In other words, there is a problem in that each node cannot send or receive data during this time. As a method to solve this problem, a function for detecting a network reconfiguration request signal is provided in the transmission/reception control unit 31, and when the network reconfiguration request signal is detected, the function is sent to the data processing unit 32 via a dedicated signal line. One possible method is to notify this and have the data processing unit 31 stop sending the data that is being sent.
In this method, it is necessary to newly provide a signal line between the transmission/reception control unit 31 and the data processing unit 32 to notify the detection of the network reconfiguration request signal, and in addition, it is necessary to provide the data processing unit 32 with a processing function to stop data transmission. There is a disadvantage that the configuration of the data processing section 32 becomes complicated due to the addition of . [0015] In the prior art, if there is a node that is transmitting data, the network reconfiguration request signal is not transferred until the data transmission is completed, so the network reconfiguration request signal is transmitted to the source. It takes time to return, and during this time, communication within the network is interrupted. An object of the present invention is to speed up the transfer of a network reconfiguration request signal in a node that is transmitting data. [Means for Solving the Problems] FIGS. 1 to 3 show diagrams explaining the principle of the present invention. 1 to 3 show the configuration of control signals and data transmission/reception related parts of each node of the ring network. 1 to 3, the same parts are shown with the same symbols, 1 is a transmission/reception control unit that controls data transmission and reception with the network, 2 is a data processing unit that transmits and receives data via the transmission/reception control unit 1, 7 is a reception transmission path, and 8 is a transmission transmission path. Reference numerals 3 to 6 are provided in the transmission/reception control unit 1, and 3 is a network reconfiguration request detection unit for detecting the start of the network reconfiguration request signal inputted from the reception transmission line 7 and the end of the signal and data frame. Means 4 usually corresponds to the data processing section 2.
An internal transmission transmission line 10 is connected to the transmission transmission line 8, and when information indicating that the beginning of the network reconfiguration request signal is detected from the network reconfiguration request detection means 3 is received, the internal transmission transmission line 10 is connected to the transmission transmission line 8. The transmission transmission path 8 is disconnected and the reception transmission path 7 is connected to the transmission transmission path 8, and when information indicating the end of the network reconfiguration request signal is received, the reception transmission path 7 and the transmission transmission path 8 are disconnected. This is a switching means for disconnecting and connecting the internal transmission transmission line 10 to the transmission transmission line 8. Further, reference numeral 5 is provided between the receiving transmission line 7 and the switching means 4 on a path connecting the receiving transmission line 7 and the sending transmission line 8 via the switching means 4, and the signal 5 is inputted from the receiving transmission line 7. signal delay means 6 for inputting the network reconfiguration request signal to the switching means 4 after delaying the network reconfiguration request signal by a time corresponding to the time required for the network reconfiguration request detection means 3 to detect the beginning of the network reconfiguration request signal; Provided in the transmission/reception control section 1, the network reconfiguration request detection means 3 detects the beginning of the network reconfiguration request signal while the data processing section 2 is transmitting data and operates the switching means 4. When receiving information indicating that the end of a signal or data frame has been detected from the network reconfiguration request detection means 3 and receiving a data transmission end notification from the data processing section 2, the internal transmission transmission path is opened after a certain delay time. 10 and the transmission transmission line 8. [Operation] In FIG. 1, the switching means 4 normally connects the internal transmission transmission line 10 and the transmission transmission line 8, and when transmitting data, the transmission data from the data processing section 2 is transferred to the internal transmission transmission line. The signal is sent to the transmission line 8 via the line 10 and the switching means 7. Here, when a network reconfiguration request signal is input from the reception transmission line 7 and the network reconfiguration request detection means 3 of the transmission/reception control section 1 detects the beginning of the network reconfiguration request signal, it operates the switching means 4. Then, the internal transmission transmission line 10 and the transmission transmission line 8 are disconnected, and the reception transmission line 7 is connected to the transmission transmission line 8. As a result, the network reconfiguration request signal input from the reception transmission line 7 is turned back by the switching means 4 and sent to the transmission transmission line 8. When the network reconfiguration request detection means 3 detects the end of the network reconfiguration request signal, it controls the switching means 4 again to disconnect the reception transmission line 7 and the transmission transmission line 8, and disconnects the internal transmission transmission line 1.
0 and the transmission transmission line 8 are connected. The above switching is performed in the same way even when data is being transmitted from the data processing unit 2, so that the data being transmitted is no longer sent to the transmission transmission path 8 upon reception of the network reconfiguration request signal, and the data being received is Since the network reconfiguration request signal input through the transmission path 7 is now transferred, the network reconfiguration process can be performed quickly. In the above case, since the switching is performed after detecting the beginning of the network reconfiguration request signal, the beginning is not transferred. If the switching means 4 is configured to resume operation when the end of the request signal is detected,
At least one network reconfiguration request signal is transferred in its entirety. Furthermore, when data is being transmitted, the transmission data is transmitted from the data processing section 2 to the switching means 4 via the internal transmission transmission line 10 even while the switching means 4 is switching, and is erased at the switching means 4. However, in this case, data is retransmitted upon request from the destination after the network reconfiguration is completed, so the data processing unit 10 does not need to perform any special processing associated with the transfer of the network reconfiguration request signal. . In FIG. 2, in the above operation, the signal delay means 5 receives the network reconfiguration request signal input from the reception transmission path 7, and the network reconfiguration request detection means 3 detects the beginning of the network reconfiguration request signal. The signal is input to the switching means 4 after being delayed by a time corresponding to the time required for detection. Therefore, it becomes possible to send out the network reconfiguration request signal inputted first to the transmission transmission path 8 in its complete form. Therefore, the network reconfiguration request signal is transferred faster than in FIG. FIG. 3 shows the operation when the data processing section 2 detects a network reconfiguration request signal during data transmission and operates the switching means 4, and then the data transmission is completed. When the network reconfiguration request detection means 3 detects the beginning of the network reconfiguration request signal and transmits the data while operating the switching means 4 to transfer the network reconfiguration request signal, the data processing section 2 A data transmission end notification is sent to the recovery control means 6 of the transmission/reception control section 1. However, at this time, since the network reconfiguration request signal is still being transferred via the switching means 4, the switching means 6 must be restored when the network reconfiguration request detection means 3 detects the end of the network reconfiguration request signal. No. However, if the switching means 6 is returned to its original state immediately when the conditions for notifying the end of data transmission and detecting the end of the network reconfiguration request signal are satisfied, the transmission transmission line 8 receives the network reconfiguration request signal that has passed through the signal delaying means 5. The transmission route for the network reconfiguration request signal is changed to the internal reception transmission path 9 and the data processing unit 2 even though all transmissions have not yet been completed.
, the internal transmission transmission line 10 and the switching means 4 route. However, if there is no delay on this route, the network reconfiguration request signal has already been sent, so a part of the network reconfiguration request signal disappears. Moreover, if the delay time of this route is long, when the switching means 6 returns to its original state, a network reconfiguration request signal corresponding to the delay is sent out, but this transmission and the switching means 6
Since the data is not synchronized with the part that was transferred before it is restored, some parts may be missing or overlap, causing the signal to become distorted. For this reason, the recovery control means 6 controls the switching means 6 to return to its original state after a certain delay time after the conditions for notifying the end of data transmission and detecting the end of the network reconfiguration request signal are met, thereby preventing the above-mentioned phenomenon. Preventing occurrence. Embodiment FIG. 4 is a block diagram of an embodiment of the present invention, and FIGS. 5 and 6 are time charts of the embodiment of the present invention. In FIG. 4, the same parts as those in FIGS.
Access controller (hereinafter referred to as MAC), 3a and 3
b is a network reconfiguration request head detection circuit and frame end detection circuit in the network reconfiguration request detection unit 3; 5 is a D-type flip-flop circuit (hereinafter referred to as D-FF) forming a signal delay circuit;
, 6a and 6b are the ANDs (hereinafter, AN
D) circuit and D-type flip-flop circuit (hereinafter referred to as D-F
F), 11 and 12 are a transmission control section and a transmission data holding section within the data processing section 2. Also, ■ to ■ are locations whose time charts are shown in FIGS. 5 and 6. FIG. 4 shows the configuration of the control signal and data transmission/reception related parts in the node, and shows an embodiment having all of claims 1 to 3, that is, an embodiment corresponding to the principle explanatory diagram of FIG. 3. There is. The embodiments based on the principle of FIGS. 1 and 2 are included in the explanation of the embodiment based on the principle of FIG. 3, so description of individual embodiments will be omitted. In FIG. 4, when transmitting data, M
When the AC 1 obtains the transmission right, the transmission control section 11 of the data processing section 2 sends the data held in the transmission data holding section 12 to the internal transmission transmission line 10, but the changeover switch (hereinafter referred to as SW) 4 is normally , since the internal transmission transmission line 10 and the transmission transmission line 8 are connected, the data is sent to the transmission transmission line 8 via the SW4. The operation of the node shown in FIG. 4 when the node receives the network reconfiguration request signal from the reception transmission line 7 and detects the beginning of the signal will be explained below with reference to FIGS. 4 and 5. The network reconfiguration request signal input from the receiving transmission path 7 (Fig. 5 ■) is input to the network reconfiguration request detection unit 3 of the MAC 1, but the network reconfiguration request head detection circuit 3a detects the network reconfiguration request signal. The first part of (Figure 5■
The network reconfiguration request signal is detected using, for example, 2 bytes of the H part), and head detection information is output (■A). SW4 operates according to this, and internal transmission transmission line 10 and transmission transmission line 8
disconnect the connection between the
Connect via FF5 (■). The network reconfiguration request signal (■) whose head part has been detected by the network reconfiguration request detection unit 3 is input to the D-FF5; ) is output after being delayed by the time required for the network reconfiguration request detecting section 3 to detect the first part, which is the time corresponding to 2 bytes of the H part in the above example (■). This output is sent to the transmission transmission path 8 via SW4. That is, the SW is switched by the network reconfiguration request signal that is first input to the receiving transmission path 7, and the same network reconfiguring request signal is sent to the transmitting transmission path 8, so that the network reconfiguring request signal disappears. transferred to the next node quickly without any problems. [0033] At this time, even if data is being transmitted from the data processing section 2, the switching is performed, so the data being sent to the internal transmission transmission line 10 disappears at SW4. However, even if data is transmitted, the data will not be received by the receiving node while the network reconfiguration request signal is being transferred within the network, so even if data transmission is interrupted, the result will not change. Data whose transmission is stopped mid-transmission is retransmitted because the receiving side notifies the data that the reception is poor after the network reconfiguration process is completed. Since this retransmission function is originally a necessary function, the data processing unit 2
Even if network reconfiguration request signal transfer processing is performed in C1 during data transmission, there is no need to add new functionality. Next, the operation when the network reconfiguration request signal ends when data is being transmitted will be explained with reference to FIGS. 4 and 6. Note that if the data processing unit 2 is still transmitting data at the time when the end of the network reconfiguration request signal is detected, the data transmission end notification will not be sent and no output will be sent from the AND circuit 6a, so SW4 will be in the switching state. Therefore, FIG. 6 shows only a time chart for the case where data transmission ends while the network reconfiguration request signal is being transferred. In this case, in the state in which the data transmission end notification has been sent (■), the frame end portion detection circuit 3b detects the end portion (T portion in FIG. 6) of the network reconfiguration request signal (
(2) B) An output is sent from the AND circuit 6a to the D-FF 6b (■), and the D-FF 6b restores SW4 after a certain period of time (■). The delay time of the D-FF 6b will be explained below. As mentioned above, while the SW4 is switching, the network reconfiguration request signal is sent to the H level of the network reconfiguration request signal by the D-FF6.
The signal is sent to the transmission transmission path 8 with a delay time corresponding to the length of the section (■, ■). When the data transmission is completed in this state, the network reconfiguration request signal is sent to the SW 4 via the internal reception transmission path 9, the transmission control section 11 of the data processing section 2, and the internal transmission transmission path 10 (■). In this state, the network reconfiguration request signal ends, and the AND circuit 6a outputs (■)
Assuming that SW4 is immediately restored to its original state by
T part) is not sent to the transmission transmission line 8 before the transmission is finished. For this reason, the D-FF 6b restores the SW4 with a delay of at least the delay time of the D-FF5 so that the SW4 returns to its original state after all network reconfiguration request signals have been sent to the transmission line 8. The above is a case where there is no delay in the route through which the network reconfiguration request signal passes, including the internal reception transmission line 9, the transmission control unit 11 of the data processing unit 2, and the internal transmission transmission line 10, but in reality, there is no delay on this route. There will also be delays. In this case, if the D-FF 6b does not have a delay time, there is a possibility that the network reconfiguration request signal will be sent to the transmission transmission line 8 by the delay time of the above route. The part of this sent network reconfiguration request signal is D-FF5.
However, depending on the time relationship with the delay time of the D-FF 5, a part of the network reconfiguration request signal may be missing or overlap. Therefore, the delay time of D-FF6b is
- Settings are made to cover both the delay time of the FF 5 and the delay time of the data processing unit 2, etc., so that part of the network reconfiguration request signal is not erased or disturbed. [0039] Although the explanation above has focused on the network reconfiguration request signal, if the end of data transmission is much later than the reception of the first network reconfiguration request signal, the transferred network reconfiguration request signal may be transmitted. The network reconfiguration request signal may not be retransmitted. In such a case, the frame end detection circuit 3b detects the end of the next arriving signal or data frame, performs the same operation as above, and restores SW4. In this case as well, the signal or data received at that time is not erased or disturbed. In addition, until the data transmission is completed, the receiving transmission line 7
Since the transmitting transmission line 8 is connected to the receiving transmission line 7, when a signal that requires transfer related to network reconfiguration is input to the receiving transmission line 7 following the first network reconfiguration request signal, it is immediately transmitted. Since the data is transferred to the transmission transmission line 8, there is no delay in network reconfiguration processing. Although the embodiment of the present invention has been described above with reference to FIGS. 4 to 6, FIGS. 4 to 6 merely show one embodiment of the present invention, and it may be possible to use a different configuration or a time chart. It is also possible to implement the invention. For example, in FIG. 4, the received network reconfiguration request signal is delayed by D-FF5 and sent to SW4.
- It is easily possible to obtain a similar effect by using a buffer memory instead of FF5, and the present invention does not exclude such a modification. Effects of the Invention As explained above, according to the present invention,
When each node in the ring network processes the network reconfiguration request signal, it becomes possible for nodes that are currently transmitting data to stop transmitting data and transfer the network reconfiguration request signal in a short period of time. Since the aborted data is not sent in an incomplete form after the network reconfiguration request signal is transferred, processing of the network reconfiguration request can be speeded up without the risk of generating new failures or network reconfiguration request factors. realizable. In addition, there is no need for a new signal line between the transmission/reception control section and the data processing section, and no special function is required in the data processing section for stopping data transmission. The above effects can be obtained with a simple configuration. Therefore, it greatly contributes to shortening the transfer time of the network reconfiguration request signal at each node of the ring network and speeding up the network reconfiguration processing accordingly.

[Brief explanation of the drawing]

[Figure 1] Diagram explaining the principle of the present invention (1)

[Figure 2] Diagram explaining the principle of the present invention (2)

[Figure 3] Diagram explaining the principle of the present invention (3)

[Figure 4] Embodiment configuration diagram of the present invention

[Figure 5] Example time chart of the present invention (Part 1)

[Figure 6] Example time chart of the present invention (Part 2)

[Figure 7] Network configuration diagram of circular network

[Figure 8] Block diagram of conventional technology

[Figure 9] Time chart of conventional technology

[Explanation of symbols]

1 Transmission/reception control section 2 Data processing section 3 Network reconfiguration request detection means 4 Switching means 5 Signal delay means 6 Recovery control means 7 Reception transmission line 8 Transmission transmission line 9 Internal reception transmission line 10 Internal transmission transmission line

Claims (3)

[Claims] Claim 1: A transmission/reception control unit (1) for controlling data transmission/reception with a network; and a data processing unit (2) for transmitting/receiving data via the transmission/reception control unit (1); (7) In a ring network in which a plurality of nodes that transmit and receive data to and from the network are arranged in a ring via a transmission transmission path (8) and a transmission transmission path (8), the reception transmission path (7) network reconfiguration request detection means (3) for detecting the start of the network reconfiguration request signal inputted from the network reconfiguration request signal and the end of the signal and data frame; and usually an internal transmission line from the data processing unit (2). (10) is connected to the transmission transmission line (8), and the network reconfiguration request detection means (
3) When information is received that the beginning of the network reconfiguration request signal is detected, the internal transmission transmission line (10) and the transmission transmission line (8) are separated from the reception transmission line (7).
is connected to the transmission transmission path (8), and when information indicating the end of the network reconfiguration request signal is received, the reception transmission path (7) is connected to the reception transmission path (7).
) and the transmission transmission line (8), and a switching means (4) for connecting the internal transmission transmission line (10) to the transmission transmission line (8), and when a network reconfiguration request signal is received, data processing is performed. A network reconfiguration request characterized in that a network reconfiguration request signal inputted from a receiving transmission path is sent to a transmitting transmission path by cutting off a transmission path for the data regardless of whether or not data is being transmitted from the receiving transmission path. Processing method. 2. The receiving transmission line is connected between the receiving transmission line (7) and the switching means (4) of a path connecting the receiving transmission line (7) and the sending transmission line (8) via the switching means (4). The switching means delays the network reconfiguration request signal input from the path (7) by a time corresponding to the time required for the network reconfiguration request detection means (3) to detect the beginning of the network reconfiguration request signal. (4) signal delay means (5) for inputting the network reconfiguration request signal to the transmitting transmission line without erasing the received network reconfiguration request signal when the switching means is operated upon receiving the network reconfiguration request signal; 2. The network reconfiguration request processing method according to claim 1, wherein the network reconfiguration request processing method is transferred. 3. In the transmission/reception control section (1), while the data processing section (2) is transmitting data, the network reconfiguration request detection means (3) detects the beginning of a network reconfiguration request signal and switches the network reconfiguration request signal. After activating the means (4), a data transmission end notification is received from the data processing unit (2), and information indicating the end of the signal or data frame is received from the network reconfiguration request detection means (3). recovery control means (6) for controlling the switching means (4) to connect the internal transmission transmission line (10) and the transmission transmission line (8) after a certain delay time when the switching means 3. The network reconfiguration request processing system according to claim 2, wherein the network reconfiguration request processing system is configured to transfer signals or data being received without disappearing or disturbing them during restoration.