JPH09162914A - Normal system selection method in ring transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the normal system selection method for a ring transmitter connecting to other transmitters connectable physically and logically in addition to connection of equipments in its own system by receiving data of its own communication channel from a selected system and not using an exclusive control monitor signal. SOLUTION: A master set and plural slave sets arranged on ring transmission lines in duplicate with systems 0, 1 are provided with abnormal state all '1s' control sections 90, 91 providing an output of reception data of all communication channels of a system on the occurrence of an abnormality of reception lines in the two systems as all '1s', with data all '1s' detection and protection sections 100, 101 detecting all '1s' of data of its own communication channel of the two separate systems and providing an output of a detection protect signal after a prescribed protect time and with a selected system discrimination section 11 discriminating a system to be selected based on the detection protection signals of the two systems. Thus, the normal system selection method for the ring transmitters is obtained, in which the normal system for its own communication data is selected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a normal system selection system in a ring transmission apparatus, and more particularly to a system selection system capable of accurately and quickly selecting a normal system of self-communication data received from both systems. Is.

In a ring transmission device, a parent device and a plurality of child devices are arranged on a ring-shaped transmission path that is duplicated clockwise and counterclockwise, and all devices transmit data to their own communication channels of both systems. At the same time, the receiving side terminates the self-communication data received from both systems, and selects and receives the reception data from the system judged to be normal as the data of the self-communication channel.

The normal system selection method in such a ring transmission apparatus is required to have few selection errors and satisfy the following requirements. It is composed of hardware and capable of high-speed switching without the intervention of software or firmware. It does not require a dedicated control supervisory signal for normal system judgment and therefore does not reduce the communication channels. In addition to the device system connection, it is preferable to be able to connect to another device that can be physically and logically connected (another transmission device, a higher-order transmission device, etc.). That is, it is desirable that the reception system selection determination signal is not a dedicated signal.

[0004]

2. Description of the Related Art FIG. 6 shows a schematic configuration of a ring transmission device, showing a configuration of a conventional communication system and a communication system to which the present invention is applied, which is shown by a double line in FIG. And a plurality of child devices S _1, S _2, ... _, S _n-1, S _{n on} a duplicated transmission line consisting of 0 system (clockwise) and 1 system (counterclockwise) indicated by thin solid lines. An example of arrangement is shown. In the figure,
Each of the two types of thick solid lines shows an example of data transmission, and illustrates two types of routes.

In FIG. 6, the child device S₁ Send from
Data is sent to both systems, and child device S_nIn selection control
The normal system is selected based on the
Place S _n-1The transmission data from the parent device M is sent to both systems.
In, the normal system is selected and received based on the selection control.
It has been shown to yield data.

FIG. 7 shows a conventional normal system selection method and shows the flow of signals in the device in the parent device or the child device. Further, FIG. 8 shows the logic of system selection of the control supervisory signal in the conventional normal system selection method. In FIG. 7, “CH” indicates a communication channel set in the self device.

At the time of normal operation, on the receiving side, the 0 system and the 1 system
Optical / electrical converter (O / E) 1_0,1 ₁ In that
The main signal is extracted from the 0-system and 1-system optical signals, and the separation unit 2_0,
2₁Select according to the channel in, and self-communicate
All channels other than the channel pass, and the data of the self-communication channel is
To drop. Then, in the selector 8, 0 system or 1 system
Received data by selecting the data of the self-communication channel of the system
Take in as.

On the transmitting side, the multiplexing units 3 _{0, 1}
In 3 ₁ , each of the passed data and the transmission data of the self-communication channel is multiplexed to generate a main signal of 0 system and 1 system, and passes through an electric / optical conversion unit (E / O) 4 _0, 4 _1. It is converted into an optical signal and transmitted to the 0-system and 1-system transmission lines.

At this time, the all 1 control section 5 _0, 5 ₁ for the 0 system and the 1 system in the abnormal state receives all the abnormal state based on the 0 system receiving line abnormal signal or the 1 system receiving line abnormal signal when the receiving line is abnormal. By 1 control, the control supervisory signal (DSEL) of all channels, which is assigned to each channel one bit independently of the main signal, is transmitted as all ones.

[0010] When sending data from the device itself, the self-communication CH bit resetting unit 6 _0, 6 _1, abnormal ol 1
The controller 5 _0, 5 ₁ in the output, and sends together with the main signal control surveillance signal of the self-communication channel reset (= 0) to.

In the parent device and the child device, the system selection signal detector 7 checks the control supervisory signal of the self-communication channel in the output signal of the all-one control unit at the time of abnormality of both systems, and uses the logic shown in FIG. Make a choice. That is, DSE
L = 1 indicates that the preceding device is abnormal, and DSEL
= 0 indicates that the preceding device is normal, so
This selects the normal system. However, when the control monitoring signal is 00 or 11, the previous system is held.

FIG. 9, FIG. 10, and FIG. 11 are diagrams (1/3), (2) conceptually showing the operation (1) of the conventional normal system selection method.
/ 3) and (3/3), which are for explaining the operation in a normal state.

[0013] Now, as shown in FIG. 9, the parent device M and a plurality of slave devices S ₁ to S ₄ via the transmission path of the 0-system and 1-system are connected in a ring, among the devices, CH _a ~ CH
_{By f} , it is assumed that the opposite communication is performed in the channel connection relationship shown in the figure.

FIG. 10 shows the state of the control / monitor signal (DSEL) of each channel in each device in this case. In each device, the control / monitor signal received from the opposite station is 0 in both systems. It is shown. It is assumed that the control monitoring signal is 0 when normal and 1 when abnormal.

FIG. 11 shows the selection state of the data reception system in each device. In each device, since the state of the control supervisory signal (DSEL) of each connection channel is 0, it is shown that the previous system is selected. There is.

12, 13 and 14 are diagrams (1/3) conceptually showing the operation (2) of the conventional normal system selection method,
(2/3) and (3/3), which are for explaining the operation at the time of abnormality.

Now, as shown in FIG.
Number of child devices S₁ ~ S_Four Via the 0-system and 1-system transmission lines
Connected in a ring, and between each device, CH_a~ C
H_fDepending on the channel connection relationship,
But the child device S₁ And S _Two Between the transmission line disconnection state
And

FIG. 13 shows that in each device in this case.
Shows the status of control supervisory signal (DSEL) of each channel
doing. For example CH_aIn the case of
Place S _Two Then, the control supervisory signal on the receiving side is 1, but
The control monitoring signal on the side becomes 0, and the next child device is relayed.
Then, the parent device M receives 0. Also for 1 system
The child device S₁ Then, the control monitoring signal of the receiving side and the transmitting side
Is 1, but in the parent device M, the control monitoring signal on the receiving side is
1, the control and monitoring signal on the transmission side becomes 0, and each next child device
Is relayed to child device S_Two At 0 is received. other
The same applies to each communication channel.

FIG. 14 shows the selection state of the data reception system in each device. For example, in the case of CH _a , the slave device S ₂ has the 0 system control monitoring signal DSEL _a 0 = 1 and the 1 system control monitoring. Since the signal DSEL _a 1 = 0, the 1-system is selected. In the parent device M, the 0-system control monitoring signal DSEL
_a 0 = 0 and the 1-system control supervisory signal DSEL _a 1 = 1
Therefore, system 0 is selected. For other channels,
Similarly, 0-system or 1-system is selected respectively.

[0020]

In the conventional normal system selection system shown in FIG. 7, a normal system is judged by using a control / monitor signal for each channel independent of the main signal to perform system selection. I have to. According to this method, the system can be switched quickly and accurately, but since an independent signal unrelated to the main signal is used for control and monitoring, the device connection is performed only by the control within the self system, It was impossible to make the lines wireless and to use other high-order group transmission lines.

Further, in the conventional normal system selection method,
Since data is selected in the common section, the panel configuration cannot be made independent for the 0-system and the 1-system, and there is a problem in that the maintenance system is inconvenient.

The present invention is intended to solve such a problem of the prior art, and in a ring transmission device, a normal control signal for self-communication is used without using a dedicated control / monitor signal independent of a main signal. System selection can be performed,
Therefore, it is not limited to connection control within the self-system,
It is an object of the present invention to provide a normal system selection method which is logically connectable to other transmission devices such as radio and higher-order group transmission devices and is advantageous in terms of maintenance system.

[0023]

In order to solve the above-mentioned problems, in the normal system selection method in the ring transmission apparatus of the present invention, the parent device M and the plurality of child devices S _{1 to} S _n are arranged in opposite directions. The parent device and each child device are arranged on a ring-shaped transmission line that is duplicated by the 0 system and the 1 system, and the parent device and each child device relay the data other than the self communication channel among the communication data of the plurality of channels received from both systems and In a system that separates and terminates the data of the communication channel, selects and takes in the received data from the system judged to be normal of both systems, and multiplexes the transmission data of its own device with the relay data and transmits it. In the device M and the plurality of child devices S _{1 to} S _n ,
When the receiving line of each system is abnormal, when all the communication channels of the system output the received data as all 1s, the all 1 control unit 9 _0, 9 ₁ at the time of abnormality of both systems and the self-communication of each separated system detecting an all 1 in the channel data a predetermined protection time taken detection protection signal outputs of both systems of data all 1 detector and protection unit 10 _0, 10 _1, predetermined on the basis of the detection protection signal of each system The selection system determination unit 11 for determining the system to be selected by the logic of 1), and the data of the self-communication channel is received by the selected system.

As described above, according to the present invention, normal system selection of self-communication data can be performed without using a dedicated control monitoring signal independent of the main signal.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a signal flow in a device according to an embodiment of the present invention. The same components as those in FIG. 3 shows a flow of signals in the apparatus in FIG. Also, in FIG.
6 shows the logic of system selection of a detection protection signal in the normal system selection method of the present invention.

The embodiment shown in FIG. 1 is similar to the case of the conventional normal system selection system shown in FIG. 7, except that it does not have a dedicated control supervisory signal, and its own device due to an abnormality in its own receiving line. The non-communication channel is converted to all 1, and the receiving side determines the normal reception system by detecting or not detecting this all 1 and switches the reception system. In FIG. 1, “CH” indicates a communication channel set in the self device.

At the normal time, on the receiving side, the 0 system and the 1 system
Optical / electrical converter (O / E) 1_0,1 ₁ In that
The main signal is extracted from the optical signals of the 0-system and 1-system transmission lines and
Remote part 2_0,2₁ Select according to the channel in
Data other than the self-communication channel passes, and the self-communication channel
Drop the flannel data. And smell in selector 8
Select the data of the 0-system or 1-system self-communication channel
Then, it is captured as received data.

On the transmitting side, the 0-system and 1-system multiplexing units 3 _0,
In 3 ₁ , the passed data and the transmission data of the self-communication channel are multiplexed to generate the main signals of the 0-system and 1-system, and the electrical / optical conversion units (E / O) 4 _0, 4 _{1 use} the optical signals. It is converted into a signal and sent to the 0-system and 1-system transmission paths.

At this time, in the all-one control unit 9 _0, 9 ₁ when the 0-system and the 1-system are abnormal, all channels are received based on the 0-system reception line abnormal signal or the 1-system reception line abnormal signal when the reception line is abnormal. The data of is output as all 1. Data all 1 for system 0 and system 1 provided in the related parts of each channel board
The detection & protection unit 10 _0, 10 ₁ detects whether or not the data of the self-communication channel in the dropped signal is all 1, and after a predetermined protection time, the protection all 1 or all protection signals are detected as protection signals. 1 ^* ( ^* indicates an inverted signal) is output. The selection system determination unit 11 outputs the system selection signal according to the logic shown in FIG. 2 according to the state of the detection protection signal and switches the selector 8 to set 0.
Data of the self-communication channel of the system or system 1 is taken in as received data.

That is, when the protection all 1 ^* is output from the system 1 and the protection all 1 is output from the system 0 as the detection protection signal, the data of the system 1 is selected and the protection all 1 from the system 1 is selected. When it is output and the protection all 1 ^* is output from the 0 system, the 0 system data is selected. When the protection all 1 ^* or protection all 1 is output from both systems, the previous system is held.

At this time, by setting the forward / backward protection time at the time of detecting all 1s as follows, even if all 1s are based on actual data, the normal system can be selected without any problem. Maximum value of data reception delay time difference between both systems <all 1 detection protection time AIS detection time of main signal << all 1 detection protection time AIS is an alarm display signal in case of line disconnection.

That is, since the transmission paths of the 0-system data and the 1-system data are different and the arrival times thereof are not always the same, the data-all-1 detection & protection unit 1 of the 0-system and the 1-system is not provided.
When the selection system determination unit 11 determines the system selection by the detection protection signals from 0 _{0 and} 10 ₁ , the protection time is set according to the condition of 1 to prevent the malfunction of the all-1 detection.

Further, when the AIS signal is generated, the frame synchronization signals are all 1, and the AIS is detected before the data is received. By taking the protection time according to the conditions there, it is possible to prevent the malfunction of the all-1 detection before the AIS detection.

FIG. 3 shows an operation flowchart (1) of the present invention, which is an image diagram of the main flowchart and shows CH-AIS 1 system detection state transition. Further, FIG. 4 shows an operation flowchart (2) of the present invention, which is an image diagram (1/2) of the subroutine flowchart, and CH-AIS.
The 0-system detection state transition (CH-AIS 0 DET) is shown. FIG. 5 is an operation flowchart (3) of the present invention, which is an image diagram (2/2) of a subroutine flowchart, showing CH-AIS 1 system detection state transition (CH-AIS 1 DET). ing.

In the main flow chart shown in FIG. 3, all counters are reset by turning on the power of the apparatus. The counter t00 is a 0-system forward protection counter,
The counter t01 is a 0-system backward protection counter, counter t
Reference numeral 10 is a 1-system front protection counter, and counter t11 is a 1-system rear protection counter. In the 0 system and the 1 system,
The reception abnormality flag indicating that there is a reception abnormality is reset.

The CH shown in FIG. 4 in the state where the receiving system and the previous system are held
-When the AIS 0 DET subroutine is called and finished, next, the CH-AIS 1 DET subroutine shown in Fig. 5 is called, and at the end, the following judgment is made.

When there is a 0 system reception abnormality flag, when there is a 1 system reception abnormality flag, and when there is no 1 system reception abnormality flag and the value of the 1st system front protection counter t10 is larger than 0, the previous system is detected. If there is no 1-system reception abnormality flag and the value of the counter t10 is 0, the 1-system reception system is selected.

If there is no 0 system reception error flag, 1
When there is no system reception abnormality flag and when there is a system 1 reception abnormality flag, the value of the 0-system front protection counter t00 is 0.
When it is larger, the previous system is held, and when the value of the counter t00 is 0 when there is the 1-system reception abnormality flag, the 0 system is selected as the receiving system.

In the CH-AIS 0 DET subroutine flowchart shown in FIG. 4, the 0-system is received, the 8 bits of the 0-system self-time slot are examined, and when all 1s, the 0-system rear protection counter is detected. Reset t01. Next, by checking the 8 bits of the previous self time slot, when all 1s are set, immediately, when not all 1s, the 0-system forward protection counter t00 is reset,
Move to the next step.

Next, the 0-system is received and the 0-system reception abnormality flag is checked. If the 0-system reception abnormality flag is present, immediately,
When there is no 0-system reception abnormality flag, the 0-system front protection counter t00 is incremented by 1, and when the counter t00 does not expire, the subroutine is ended. Also, the counter t00
When is completed, the 0-system reception abnormality flag is set and the subroutine is terminated.

On the other hand, when the 8 bits of the 0-system self-time slot are not all 1, the 0-system forward protection counter t
00 is reset, 8 bits of the previous self time slot are checked, and immediately when all 1s are set, when not all 1s, the 0-system backward protection counter t01 is reset, and the process proceeds to the next step.

Next, the 0-system is received, the 0-system reception abnormality flag is checked, and when there is no 0-system reception abnormality flag, immediately,
When the 0-system reception abnormality flag is present, the 0-system rear protection counter t01 is incremented by 1, and when the counter t01 does not expire, the subroutine is ended. Also, the counter t01
When has expired, the 0-system reception abnormality flag is reset and the subroutine ends.

The operation shown by the CH-AIS 1 DET subroutine flowchart shown in FIG.
In the subroutine flowchart of the CH-AIS 0 DET shown in FIG. 4, the 0-system reception is defined as the 1-system reception, the 0-system rear protection counter t01 is replaced with the 1-system rear protection counter t11, and the 0-system front protection is performed. Counter t0
The operation is the same as when 0 is replaced with the backward protection counter t10 of the 1-system.

Although the above-mentioned operation flowchart of the present invention has been described as a software image, it is easy to realize this method by hardware, and high speed operation is possible. Further, the method of the present invention is not limited to the case of the ring transmission device, but can be applied to other transmission devices that constantly form two transmission paths by making some arrangement.

[0045]

As described above, according to the present invention, since a signal unique to a device such as a control / monitor signal in the conventional system is not used, a physical connection is made in addition to the device connection in the self system. , It is possible to establish connection with another transmission device such as a radio that is logically connectable, a high-order group transmission device, or the like. The system of the present invention is capable of high-speed operation except that there is an operation delay corresponding to the protection time due to the hardware configuration.

Since the method of the present invention operates self-communication data, there is an advantage that the communication channel is not reduced by applying the present invention. Further, since the 0-system and the 1-system can be independent in the common part of the data transmission / reception circuit, the panel is divided, which is advantageous in the configuration of the maintenance system.

[Brief description of the drawings]

FIG. 1 is a diagram showing a signal flow in an apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing the logic of system selection of a detection protection signal in the normal system selection method of the present invention.

FIG. 3 is a diagram showing an operation flowchart (1) of the present invention.

FIG. 4 is a diagram showing an operation flowchart (2) of the present invention.

FIG. 5 is a diagram showing an operation flowchart (3) of the present invention.

FIG. 6 is a diagram showing a schematic configuration of a ring transmission device.

FIG. 7 is a diagram showing a conventional normal system selection method.

FIG. 8 is a diagram showing a logic of system selection of a control supervisory signal in a conventional normal system selection system.

FIG. 9 is a diagram (1/3) conceptually showing the operation (1) of the conventional normal system selection method.

FIG. 10 is a diagram (2/3) conceptually showing the operation (1) of the conventional normal system selection method.

FIG. 11 is a diagram (3/3) conceptually showing the operation (1) of the conventional normal system selection method.

FIG. 12 is a diagram (1/3) conceptually showing the operation (2) of the conventional normal system selection method.

FIG. 13 is a diagram (2/3) conceptually showing the operation (2) of the conventional normal system selection method.

FIG. 14 is a diagram (3/3) conceptually showing the operation (2) of the conventional normal system selection method.

[Explanation of symbols]

9 _0, 9 ₁ abnormal ol 1 controller 10 _0, 10 ₁ Data All 1 detector and protection unit 11 selecting system determination unit M parent device S ₁ to S _n terminal device

Claims (1)

[Claims] 1. A parent device and a plurality of child devices are arranged on a ring-shaped transmission line that is duplexed by 0 system and 1 system in opposite directions, and the parent device and each child device receive from both systems. The data other than the self-communication channel is relayed among the communication data of the plural channels, the data of the self-communication channel is separated and terminated, and the reception data from the system judged to be normal out of the both systems is selected and fetched. In addition, in a system that transmits the transmission data of its own device and the data to be relayed and transmits the received data of all communication channels of the system to the parent device and a plurality of child devices when the receiving line of each system is abnormal. All 1 control unit in case of abnormality of both systems which outputs as all 1, and all 1 in the data of the separated self-communication channel of each system is detected and a predetermined protection time is taken for detection protection A data all 1 detection & protection unit for both systems which outputs a signal, and a selection system judgment unit for judging a system to be selected by a predetermined logic based on the detection protection signals of the respective systems. A normal system selection method in a ring transmission device characterized by receiving data of a self-communication channel by the system.