JPS6142980B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system control system in a loop network having a duplex configuration.

Conventionally, when performing system control of a loop network with a redundant configuration, system control in a redundant configuration,
System control was required when transitioning to a loopback configuration.

In the loop-back configuration state, the loop is single and duplex systems are connected together on the loop, so system control from the center requires complex control.

An object of the present invention is to provide system control from the center that only controls the system during duplexing and does not require specific control during the loopback configuration.

Therefore, in the method of the present invention, system control is enabled only for one of the duplex systems connected on a single loop by transmitting loop identification information that can identify each duplex system together with system control information from the central system. With regard to systems connected within a single loop, systems connected within the single loop will have system control enabled regardless of the loop identification above, and systems connected outside the single loop will have system control enabled. be made invalid.

In order to implement the above system, a loop-like network is constructed, which is composed of one central device and a plurality of terminal devices, and each of the redundant components is connected in a loop through a transmission line to form a redundant configuration.

Each device has a control channel circuit for communicating between the central device and the terminal devices, and communicates control information from the central device and monitoring information from the terminal devices as described below. In order to identify the loops forming the duplex configuration, the central device sends different loop identification information to each loop, and each terminal device has a loop ID circuit that identifies its own loop using this information. In order to monitor the system status, the central device invites the terminal devices to transmit status information, and the terminal devices each have a status monitoring circuit that sends the status information and the central device collects the status of the entire system. .

When a transmission path failure is detected, the terminal equipment turns back the transmission path and performs a loopback to bypass the failure point. When a loopback occurs, the central equipment determines the loopback configuration based on system status information, performs configuration settings, and then returns the transmission path to the terminal equipment. The terminal equipment has a loopback circuit that instructs the device to maintain the loopback state and maintains the loopback state. Depending on the system status, the central device sends a system switching instruction to either the active system or the standby system to each of the duplex systems, and the terminal equipment performs system switching according to this instruction.

In addition, the loop ID circuit invalidates the instruction in the case of the active system outside the own loop, and the system switching circuit that forcibly switches the system outside the loop to the standby system and the system inside the loop to the active system by loop back. have

Next, the system of the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a block diagram showing the system configuration of a system implementing the method according to the present invention.

One central station (CS) 113 and a plurality of terminal stations (TDS) 23 are connected in a loop to form a loop network. The central device 13 includes duplicated CS control circuits 10 and 11 and a system control circuit 12 that controls the entire system, and the terminal device 23 includes duplicated TDS control circuits 20 and 11.
21 and a common circuit 22 that connects lines and the like. The CS control circuits 10 and 11 and the TDS control circuits 20 and 21 are connected by transmission lines 0 and 1 in a duplex loop. Redundant CS control circuit 10,
The TDS control circuit 20 and transmission line 0 are called the 0 system, and the other is called the 1 system.

The redundant system is operated in redundant mode, with the active side being called the active (ACT) system and the backup side being called the standby (SBY) system. Common circuit 22 is redundant TDS control circuit 2
0 and 21, respectively, and are logically connected to the ACT system side.

Figures 2a and 2b and 3a and 3b are examples of operating modes, with solid lines showing the active (ACT) system and dotted lines showing the standby (SBY) system.

Figure 2 shows a single-system operation state. In Figure 2 a, the 0 system side is the ACT system, and the common circuit 22 is the TDS on the 0 system side.
It is logically connected to the control circuit 20, and in FIG. 2b, the 1st system side is ACT, and the common circuit 22 is logically connected to the TDS control circuit 22 on the 1st system side.

FIG. 3 shows the loopback operation state.

In Figure 3a, due to a transmission path failure in the area marked with an x, the central device 13 and the terminal device 23#4 loop back and become a single loop, and the
The system side is the ACT system, and the common circuit 22 is the 1st system side.
Although it is connected to the TDS control circuit 21, the terminal equipment 23#4 has the ACT system on the 0 system side and the common circuit 22
is connected to the TDS control circuit 20 on the 0-system side.

In Fig. 3b, due to the transmission path failure in the area marked with an x, end station devices 23#2 and #3 loop back and become a single loop, and the 0 system side except for end station device 23#3.
It is an ACT system, and the common circuit 22 is connected to the TDS control circuit 20 on the 0 system side, but the terminal equipment 23 #3
The 1st system side is the ACT system, and the common circuit 22 is connected to the TDS control circuit 21 on the 1st system side.

FIG. 4 is a detailed block diagram of the central unit 13, which is constructed as follows. CS bypass switching circuit 1
00, 110 is CS loopback control circuit 125
The CS control circuits 10 and 11 are bypassed by the instruction or by turning off the power to the CS control circuits 10 and 11.

CS transmitting/receiving circuits 101 and 111 perform transmission and reception of data on the transmission line, loop synchronization, extraction of synchronization timing, and detection of transmission line failure. The CS loopback switching circuits 102 and 112 perform connection switching (loopback) in which data to be sent to the transmission line on the other system side is sent to the transmission line on the own side according to instructions from the CS loopback control circuit 125. CS drop inserters 103 and 113 are CS transmitting and receiving circuits 101 and 11
Data is taken out and inserted into the transmission line via 1. CS control channel circuit 104,1
14 sends control information to and from the terminal device 23 and receives status monitoring information. The SYS loopback control circuit 125 receives the state information of the central device 13 and the terminal device 23 from the SYS state monitoring control circuit 128 and the SYS
Based on the loop identification information from the loop ID control circuit 127, the loop back configuration is determined and set, and an instruction to maintain the loop back state is given to the terminal device 23.

The SYS system control circuit 126 determines the system configuration based on the status information of the central device 13 and the terminal device 23 from the SYS status monitoring control circuit 128, performs system switching of the central device 13, and system switching of system switching instructions to the terminal device 23. control. The SYS loop ID control circuit 127 sends out and monitors reception of loop identification codes for the 0 and 1 systems of the duplex loop. The SYS state monitoring control circuit 128 monitors the state of the central device 113 and controls the state of the terminal device 23. SYS bypass control circuit 10
Reference numeral 9 performs bypass control based on the state information of the central device 13 and the terminal device 23 from the SYS state monitoring control circuit 128.

FIG. 5 is a detailed block diagram of the terminal equipment 23, which is constructed as follows. TDS bypass switching circuits 200 and 210 are TDS bypass control circuit 20
9,219 instructions or TDS control circuit 20,2
1 bypasses the TDS control circuits 20 and 21. The TDS transmitting/receiving circuits 201 and 211 transmit and receive data on the transmission path, extract synchronization timing, and detect transmission path failures. The TDS loopback switching circuits 202 and 212 perform connection switching (loopback) in which data sent to the transmission line on the other side is sent to the transmission line on the own side according to instructions from the TDS loopback control circuits 205 and 215 on the other side.
TDS drop inserter 203, 213 is TDS
Data is taken out and inserted into the transmission line via the transmission/reception circuits 201 and 211. The TDS control channel circuits 204 and 214 receive control information from the central device 13 and transmit status monitoring information. TDS loopback control circuit 205, 215
detects a transmission path failure in the TDS transmitting/receiving circuits 201 and 211 of the other system, and issues a loopback instruction to the TDS loopback switching circuit of the other system, and also releases the loopback state based on an instruction to maintain the loopback state from the SYS loopback control circuit 125 of the central unit 113. Inhibits and maintains loopback state.
TDS system switching control circuits 206 and 216 receive ACT or
The SBY system switching instruction instructs the TDS system switching circuit 220 in the common section to switch, and if no loop ID match signal is received from the TDS loop ID circuits 207 and 217, the ACT system switching instruction is invalidated.
SBY instruction.

In addition, the TDS loopback control circuit 20 of another system
Even if a loopback instruction is issued from 5,215 to the own system, the system switching instruction of the own system's ACT is invalidated and an SBY instruction is issued. TDS loop ID circuit 207,
217 determines the loop identification code from the SYS loop ID control circuit 127 of the central device 13, and if it is the loop identification code of its own system, sends a loop ID matching signal to the TDS system switching control circuits 206 and 216. In addition, the TDS loopback control circuit 2 of the own system
If 05,215 is instructing a loop back to another system, regardless of the loop identification code,
Loop ID to TDS system switching control circuit 206, 216
Sends a match signal. TDS status monitoring circuit 20
8,218 sends TDS status information to the central unit 13 according to control instructions from the SYS status monitoring circuit 128 of the central unit 13.

The TDS bypass control circuits 209 and 219 are operated by the TDS bypass switching circuits 200 and 2 according to control instructions from the SYS bypass control circuit 109 of the central device 13.
A bypass instruction is given to 10. The TDS system switching circuit 220 performs system switching in response to system switching instructions (ACT, SBY) from the TDS system switching control circuits 206 and 207.

Next, the system control operation will be explained. Figure 2 shows the system state when no loopback occurs, where the solid line indicates the ACT system and the dotted line indicates the SBY system. The 0 series side in Figure 2 a is
Let me explain what happens when you are in an ACT type state. SYS
The system control circuit 126 sends an ACT instruction to the 0 system and an SBY instruction to the 1 system via the CS control channel control circuits 104 and 114. TDS control channel circuit 20 of each terminal equipment 23
4,214, the TDS system switching circuit 206,
At step 216, the 0-system side receives an ACT instruction, and the 1-system side receives an SBY instruction. Additionally, the SYS loop ID control circuit 126 is connected to the CS control channel control circuit 10.
4,114, the 0 system loop identification code is sent to the 0 system, and the 1 system loop identification code is sent to the 1 system. TDS loop ID via TDS control channel circuits 204 and 214 of each terminal device 23
The circuits 207 and 217 receive the 0-system loop identification code on the 0-system side, and the 1-system loop identification code on the 1-system side.
Since this code is the self-loop identification code, TDS
A loop ID match signal is sent to system switching control circuits 206 and 216. TDS system switching control circuit 206,
216 is thereby set to 0 to the TDS system switching circuit 202.
The system sends an ACT instruction, and the 1st system sends a system switching instruction of the SBY instruction. The TDS system switching circuit 202 is connected to the 0 system by an ACT instruction from the 0 system.

Through these control operations, the 0 system side becomes the ACT system, and the common circuit 22 is logically connected to the 0 system side.
System switching is performed as follows.

In the 0-system ACT state shown in Figure 2a, SYS
When a failure on the ACT system side is detected in the status information of the central device 13 or the terminal device 23 from the status monitoring control circuit 128, the ACT instruction from the SYS system control circuit 126 to the 0 system is changed to an SBY instruction, and the ACT instruction to the 1 system is changed to the SBY instruction. Perform system switching from SBY instruction to ACT instruction.

Thereafter, due to the control operation described above, the 1st system becomes the ACT system as shown in FIG. 2b, and the common circuit 22 becomes the 1st system.
Logically connected to the system side.

FIG. 3 shows the system state when loopback occurs; the part shown by the solid line is the ACT system, and the part shown by the dotted line is the SBY system. FIG. 3a shows a case where a transmission path failure occurs between the central device 13 and the terminal device 23#4 and loopback is performed. The 1-system TDS transmitting/receiving circuit 211 of the terminal device 23#4 detects a transmission path failure and notifies the 0-system TDS loopback control circuit 205 of the transmission path failure. The 0-system TDS loopback control circuit 205 issues a loopback instruction to the 1-system TDS loopback switching circuit 212 based on the fault notification. The 1-system TDS loopback switching circuit 212 switches the transmission data to the 0-system transmission line into 1
Connection switching (loop back) for sending out to the system transmission path
Do the following. In response to an instruction from the SYS loopback control circuit 125 of the central unit 13, a loopback instruction is given to the 0-system CS loopback switching circuit 102, and connection switching is similarly performed to send data sent to the 1-system transmission path to the 0-system transmission path. (loop back).

In addition, the SYS system control circuit 126 is ACT on the 1 system side.
Give instructions.

As a result, as shown in FIG. 3a, the central device 1
3 and end station device 23#4 to form a single loop. SYS system control circuit 126 and SYS loop
On the loop from the ID control circuit 127 via the CS control channel circuit 114, the ACT instruction and
System loop identification code is flowing. Terminal equipment 23 excluding terminal equipment 23 #4 that is performing loopback
In #1 to #3, the TDS loop ID identification circuit 217 on the 1-system side sends a loop ID matching signal to the TDS system switching control circuit 216, so the 1-system becomes the ACT system, and the 0-system side becomes the ACT system due to the loop ID mismatch. It will be SBY type. Terminal equipment 23#4 performing loopback
is the TDS loopback control circuit 205 on the 0 system side.
Because the TDS loop ID identification circuit 207 on the 0-system side sends a loop ID match signal to the TDS system switching control circuit 206 regardless of the loop ID code due to the loopback instruction to the 1-system side, the 0-system
ACT, and the 1st system side is instructed to loop back, so the TDS system switching control circuit 216 on the 1st system side
becomes SBY. As a result of these control operations, the 1st system side, except for the loopbacked terminal equipment 23#4,
The common circuit 22 becomes the ACT system, and the 0 system side of the terminal device 23#4 becomes the ACT system, and the common circuit 22 is logically connected to the 0 system side.

Figure 3b shows the terminal device 23#2 and the terminal device 23.
This is a case where a transmission path failure occurs between #3 and a loopback occurs. TDS of 1st system of terminal equipment 23#2
The transmitter/receiver circuit 211 detects a transmission path failure and notifies the TDS loopback control circuit 205 of the 0 system. The 0-system TDS loopback control circuit 205 issues a loopback instruction to the 1-system TDS loopback switching circuit 212 in response to the fault notification.

The TDS loopback switching circuit 212 of the 1st system is 0.
Connection switching (loopback) is performed to send data sent to the transmission line of the first system to the transmission line of the first system. Also, the 0-system TDS transmitting/receiving circuit 201 of the terminal device 23#3
detects a transmission path failure, and with the same operation as above, 1
Connection switching (loopback) is performed to send data sent to the system transmission path to the 0 system transmission path. In response to an instruction from the SYS loopback control circuit 125 of the central device 13, a bypass instruction is given to the CS bypass switching circuit 210 of the 1st system, and the CS control circuit 11 of the 1st system is
is bypassed. Further, the SYS system control circuit 126 issues an ACT instruction to the 0 system side. As a result, as shown in FIG. 3B, the 1-system side of the central device 13 is bypassed, and looped back between the terminal devices 23 #2 and #3 to form a single loop.

From the SYS system control circuit 126 and SYS loop ID control circuit 127 to the CS control channel circuit 114
An ACT instruction and a 0-series loop identification code are flowing on the loop via.

Terminal equipment 23#2 performing loopback,
Terminal equipment 23 #1 and #4 excluding #3 are on the 0 system side.
Since the TDS loop ID identification circuit 207 sends a loop ID matching signal to the TDS system switching control circuit 206, the 0 system becomes the ACT system, and the 1 system becomes the SBY system due to the loop ID mismatch. The terminal device 23 #2 performing loopback switches to the TDS system switching control circuit 2 on the 1-system side in response to a loopback instruction from the TDS loopback control circuit 205 on the 0-system side to the 1-system side.
16 will be SBY type, and 0 type side will be ACT type.
Also, the terminal station 23#3 that is performing loopback
is the TDS loopback control circuit 215 on the 1st system side.
In response to the loopback instruction for the 0-system side, the TDS system switching control circuit 216 on the 1-system side becomes the ACT system, and the 0-system side becomes the SBY system. With the exception of the terminal device 23#3 that has been looped back by these control operations, the 0 system side becomes the ACT system, the common circuit 22 becomes the 0 system side, the 1 system side of the terminal device 23#3 becomes the ACT system, and the common circuit 22 becomes the ACT system. Logically connected to the 1st system side.

Furthermore, in both a and b of FIG. 3, when a loopback configuration is adopted, a loopback state maintenance instruction is sent to the terminal device 23 via the CS control channel circuit 104 in accordance with an instruction from the SYS loopback control circuit 125. , terminal device 23
TDS loopback control circuit 205, 215
The loopback state is maintained by this loopback state maintenance instruction, so even if the transmission path failure disappears, the loopback state does not change and the system configuration does not change either.

When the loopback configuration is established in this manner, system switching is performed without any special system switching control.

As described above, the present invention has the advantage that system switching during a loopback configuration is controlled by the loopback status of the terminal equipment, thereby eliminating the need for system control specific to the loopback configuration from the central location.

[Brief explanation of the drawing]

FIG. 1 shows an example of a system configuration for realizing the method of the present invention, FIG. 2 shows an example of a single-system operating state, and FIG. 3 is a circuit diagram showing an example of a loop-back operating state. 0...Transmission line (0 system), 1...Transmission line (1 system), 10
...CS control circuit (0 system), 11...CS control circuit (0 system)
system), 12...System control circuit, 13...Central device, 20...TDS control circuit (0 system), 21...TDS control circuit (1 system), 22...Common circuit, 23...Terminal equipment, Figure 4 shows the main unit. 1 is a circuit diagram showing an embodiment of a detailed block of a central unit of a system implementing the inventive method; FIG. 100...CS bypass switching circuit (0 system), 1
10...CS bypass switching circuit (1 system), 101...
CS transmitting/receiving circuit (0 system), 111...CS transmitting/receiving circuit (1 system), 102...CS loopback switching circuit (0 system)
system), 112...CS loopback switching circuit (1
system), 103...CS drop inserter circuit (0
system), 113...CS drop inserter circuit (1
system), 104...CS control channel circuit (0
system), 114...CS control channel circuit (1
system), 125...SYS loopback control circuit, 12
6...SYS system control circuit, 127...SYS loop ID control circuit, 128...SYS status monitoring control circuit, 129...
SYS Bypass Control Circuit FIG. 5 is a circuit diagram showing an embodiment of the detailed block of the terminal equipment of the system implementing the method of the present invention. 200...TDS bypass switching circuit (0 system), 210...TDS bypass switching circuit (1 system), 201...TDS transmission/reception circuit (0 system)
system), 211...TDS transmission/reception circuit (1 system), 202
...TDS loopback switching circuit (0 system), 212...
TDS loopback switching circuit (1 system), 203...
TDS drop inserter circuit (0 series), 213...
TDS drop inserter circuit (1 series), 204...
TDS control channel circuit (0 series), 214
...TDS control channel circuit (1 system), 20
5...TDS loopback control circuit (0 system), 215
...TDS loopback control circuit (1 system), 206...
TDS system switching control circuit (0 system), 216...TDS system switching control circuit (1 system), 207...TDS loop ID circuit (0 system), 217...TDS loop ID circuit (1 system), 2
08...TDS status monitoring circuit (0 system), 218...TDS
Condition monitoring circuit (1 system), 209...TDS bypass control circuit (0 system), 219...TDS bypass control circuit (1 system).

Claims (1)

[Claims] 1 In a loop network with a redundant configuration, it has one central device and multiple terminal devices, and each duplex unit is connected by a transmission path to form a double loop network. The device includes a control channel circuit that provides a control channel for communicating network control information with terminal equipment, a loop ID circuit that sends and receives loop identification information for identifying redundant loops via the control channel, and the status of the central equipment. A status monitoring circuit controls the status monitoring of the terminal equipment via the monitoring and control channel, and determines and sets the loopback configuration based on the status information from the status monitoring circuit, and sends the loopback status to the terminal equipment via the control channel. It has a loopback circuit that issues hold instructions, and a system switching circuit that makes system switching decisions and system configuration settings based on status information from the status monitoring circuit, and issues system switching instructions to the terminal equipment via a control channel. a control channel circuit that provides a control channel for communicating network control information with the central device; a loop ID circuit that determines whether the loop is a self-system loop based on loop identification information sent from the central device via the control channel; A status monitoring circuit that sends the status information of the terminal equipment to the central equipment under control from the central equipment via the control channel and a loopback that autonomously turns back the transmission path and bypasses the point of failure by detecting failures in the transmission path. , the loopback circuit maintains the loopback state in response to an instruction to maintain the loopback state from the central device via the control channel, and the system is switched by a system switching instruction for the active system and standby system from the central device via the control channel, It has a system switching circuit that enables the active system instruction when it is determined to be the own system loop by the loop ID circuit, and sets the system outside the loop to the backup system and the system inside the loop to the active system in the loopback state. 1. A loop network system control method characterized in that system control is performed without the system control specific to the loopback configuration even when the system shifts to the above configuration.