JPH10243055A - Device and method for switching transmission line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain high speed processing by detecting the abnormality of transmitter/receiver using a 1st transmission line, performing the control/update of signal processing part based on a communication processing state, updating the internal information of transmitter/receiver using a 2nd transmission line with the fault information of 1st transmission line, and selectively switching a 1st or 2nd signal based on the updated 2nd internal information. SOLUTION: When a signal to be inputted from a transmission line 3a to a signal processing part 5a is interrupted while a 0-system interface board 9a is operated as an active system and a 1-system interface board 9b is operated as a spare system, a fault detection part 6a detects the fault. An information collecting part 7a receives the detected result from the fault detection part 6a and outputs event information. A sequencer 8a of active system switches the internal state and outputs the fault detected result to an information collecting part 7b of spare system, and a sequencer 8b outputs a signal to a signal processing part 5b of spare system. A counter station interface package 10 performs switching processing and transmits the signal through a transmission line 3b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission line switching device used for a transmission device having an active transmission line and a protection transmission line, and a switching method thereof.

[0002]

2. Description of the Related Art FIG. 7 is a functional block diagram showing an interface package and a supervisory control package of a transmission apparatus according to the prior art. 7, reference numeral 11 denotes a transmission line 3.
Transmission devices 3a and 3b for transmitting signals to the transmission device 12 of the opposite station via a and 3b are transmission lines for connecting the transmission device 11 and the transmission device 12 and transmitting signals. A switching control unit for receiving signals from the signal processing units 15a and 15b and selecting and outputting any of the signals received from the signal processing units 15a or 15b based on a switching signal from the monitoring control unit 17; Is a signal processing unit that performs signal processing for converting an optical signal received from the transmission apparatus 2 of the opposite station via the transmission paths 3a and 3b into an electric signal and extracting information from the transmission apparatus 12, and 16a and 16b The information collecting unit 17 collects information on the processing state of the processing units 15a and 15b, receives the information collected by the information collecting units 16a and 16b, and monitors the states of the signal processing units 15a and 15b.
When an abnormality is detected, the switching control unit 17 outputs a switching signal to control the switching process of the switching control unit 14.

[0003] A microprocessor is used for the monitoring control unit 17. The microprocessor reads a command and data from a storage memory (not shown) to execute a program described in a computer language, and executes an own station interface package. Control.

Next, the operation will be described. Transmission device 11
During the operation of (1), the monitoring control unit 17
a, 15b, and the operation state of other devices (not shown) in the transmission device 11 are monitored, and the operation of the signal processing units 15a, 15b, and other devices in the transmission device 11 is controlled according to the operation state. I do.

The monitoring operation of the monitoring control unit 17 is divided into an operation of collecting the operation states of the signal processing units 15a and 15b to be monitored and other devices, and an operation of outputting a command corresponding to the collected operation states. . The operation of collecting the operation state is performed by the information collecting unit 16 which collects information of each monitoring target.
This is performed by sequentially collecting the operation state information from a, 16b, and the like. That is, the monitoring control unit 17 first collects the operation state information of the signal processing unit 15a from the 0-system information collection unit 16a via the bus. The monitoring control unit 18 determines that
The operation state information of the signal processing unit 15b is collected from the system information collection unit 16b via the bus. Then, similarly, the operation state information is collected from the information collection unit provided in the other device.

When the monitoring control unit 17 collects the operation state information, the monitoring control unit 17 outputs a control command for controlling the operation of each monitored object according to the collected operation state. For example, when the 0-system signal processing unit 15a is operating as the active system and the 1-system signal processing unit 15b is operating as the standby system, a failure occurs in the active system signal processing unit 15a and the information collecting unit 16a When the monitoring control unit 17 is notified from the monitoring control unit 17 that the failure has occurred as the operation state information, the monitoring control unit 17
And outputs a switching signal.

The switching control unit 14 which has received the switching signal
Switches the signal to be output, and the signal processing unit 1 which is the active system
The output of the signal received from the signal processing unit 15b is stopped, and the output of the signal received from the signal processing unit 15b, which is the standby system, is started. The conventional transmission device performs the switching control as described above.

In the above switching control, the signal processing is performed from the active signal processing unit 15a to the standby signal processing unit 1a.
5b, the internal state of the active system is transferred to the standby system at the time of switching, as described in Japanese Patent Application Laid-Open No. 62-171251. The transfer of the internal state is performed by transferring information necessary for executing the communication protocol. If the transfer of the internal state is not performed, the standby system cannot continuously execute the communication protocol, and a problem such as re-execution of the procedure occurs. Therefore, the transfer of the internal state is performed. Was.

The signal processing unit 15a has a triple-matched filter in order to prevent a transmission error of a transmission signal generated on the transmission line 3a. The transmission device 12 on the transmission side
The signal is transmitted for a fixed period of time, though short. The triple match filter detects the signal three times during this fixed time. Then, only when the values of all the detected signals match, the detected signal is output.

[0010]

In the conventional transmission apparatus as described above, the monitoring control unit 17 sequentially collects the operation information of each monitoring target, and the monitoring control unit 17 determines the status of each monitoring target. And output control instructions. Therefore, when the operation state of the monitoring target changes, it takes time to output the control command, and if the number of interface packages increases in the active system and the information to be processed increases, the switching process is completed within the requested time. However, there is a problem in that transmission / reception with other transmission devices causes a problem and reliability is low.

That is, the monitoring control unit 17 performs monitoring control of other control devices in addition to the active and standby signal processing units, and polls the operating state of each monitoring target via the bus. Then, the internal processing in the monitoring control unit 17 according to each operation state is executed by a microprocessor and a program provided in the monitoring control unit 17. Here, when the monitoring control unit 17 is performing processing for another device, even if a problem such as a failure or a signal failure occurs in the active system, the monitoring control unit 17 executes the processing for another device. If there are a plurality of other devices, the processes for those devices are sequentially executed, and the switching control is not performed and the switching control is delayed until the processor reaches the process for the active system.

Further, since the internal state information is transferred at the time of the switching control as described above, high-speed switching cannot be performed, which causes a reduction in reliability.

In the case of a triple match filter, there is a problem in that, if a match occurs three times in a row, an erroneous signal is output and the reliability is reduced.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a highly reliable transmission line switching device and a switching method thereof.

[0015]

According to the transmission path switching apparatus of the present invention, a first signal processing section for transmitting and receiving signals using a transmission apparatus of the opposite station and a first transmission path, and the first transmission section A first failure detection unit that detects an abnormality in transmission / reception using a path and outputs event information corresponding to the type of the detected abnormality, and a first internal unit that indicates a processing state of a communication process with the transmission apparatus of the opposite station. And updating the first internal state information based on the event information or the inter-station switching command from the opposite transmission apparatus, and updating the first internal state information based on the first internal state information. A first transmission control unit having a first control unit for controlling the signal processing unit; and a second transmission / reception unit for transmitting / receiving a signal using the second transmission path to / from the opposite transmission device.
And the second internal state information indicating the processing state of the communication processing with the opposite transmission apparatus, and the second internal state information is the same as the updated first internal state information. A second control unit that outputs a switching signal based on the event information from the first failure detection unit that has occurred after the update and the updated second internal state information that has been updated. And a second transmission control unit having: a signal received by the first signal processing unit, or a signal received by the second signal processing unit, based on the switching signal. And a switching unit for outputting.

The second transmission control unit has a second failure detection unit that detects an abnormality in transmission and reception using the second transmission path and outputs event information according to the type of the detected abnormality. , The second control unit, when the second failure detection unit outputs event information or when the inter-station switching command is output from the opposite transmission device, the second failure detection unit Based on the output event information or the inter-office switching command, an update process for updating the second internal state information is performed, and the first control unit performs a process when the second control unit performs the update process. Updating the first internal state information to information representing the same internal state as the updated second internal state information, and updating the event information from the second failure detection unit, which has occurred after the update, and the updated The switching signal is generated based on the first internal state information. It is intended to force.

Further, the second control unit stores an address generated based on the event information and the second internal state information,
It has a storage unit that stores control information and internal state information corresponding to the event information and the second internal state information.

A first signal processing unit for receiving a signal transmitted from the transmission apparatus of the opposite station using the first transmission path;
A second signal processing unit for receiving a signal transmitted from the transmission apparatus of the opposite station using the second transmission path, and extracting a first inter-station switching command from the signal received by the first signal processing unit And extracting a second inter-station switching command from the signal received by the second signal processing unit, and determining whether the first inter-station switching command matches the second inter-station switching command. And a switching signal is output based on the inter-station switching command when the inter-station switching command comparing unit determines that they match, and when it is determined that they do not match, the switching is performed. A switching signal control unit that does not output a signal, a signal received by the first signal processing unit, and a signal received by the second signal processing unit, based on a switching signal output by the switching signal control unit. , The signal received by the first signal processing unit, or A switching unit for selecting and outputting one of the second signal by the signal processing unit has received, in which with a.

According to the transmission path switching method of the present invention, communication is performed between the transmission apparatus of the opposite station and the first signal processing unit connected to the transmission apparatus of the opposite station via the first transmission path. A communication step of updating the internal state of the first transmission control unit for monitoring the state of the communication; and a communication step between the transmission apparatus of the opposite station and a second signal processing unit connected via a second transmission path. A synchronization step of synchronizing the internal state of the second transmission control unit for monitoring the state with the internal state of the first transmission control unit updated in the communication step, and, after the synchronization step, the first transmission path. A control step of outputting a switching signal based on the information of the failure that has occurred and the internal state of the second transmission control unit synchronized in the synchronization step, and a switching unit that receives the switching signal outputs a signal to be output, Sent from the first signal processing unit. From signal, those having a switching step of switching to a signal transmitted from the second signal processing unit.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a functional block diagram illustrating the transmission device according to the first embodiment. In FIG. 1, reference numeral 1 denotes a transmission device that is connected to a subscriber interface package or the like (not shown) and transmits a signal to a transmission device 2 of the opposite station via transmission lines 3a and 3b. 1 is a transmission apparatus for transmitting and receiving signals to and from the other party. 3
a and b are transmission lines that connect the transmission device 1 and the transmission device 2 and transmit signals. Here, 3a and b are the first
And the second transmission path 3b. 4 receives signals from the signal processing units 5a and 5b,
a, 8b, and selects one of the signals received from the signal processing unit 5a or 5b,
This is a switching control unit that is exchanged in an X (exchange) package and outputs to a subscriber interface package or the like (not shown). Here, the switching control unit 4 has a role of a switching unit. 5a and 5b indicate transmission paths 3a and 3
b) is a signal processing unit that converts an optical signal received via the communication device b into an electric signal and performs signal processing for extracting information from the transmission device 2. The signal processing unit 5a includes a first signal processing unit and a signal processing unit 5b. Is a second signal processing unit.

Reference numerals 6a and 6b denote failure detection units for detecting failures of the respective functional units in the own station interface package 9 such as the signal processing units 5a and 5b and outputting event information relating to the detected failures to the information collection unit 7a. In this case, 6a is a first failure detection unit, and 6b is a second failure detection unit. 7
“a” collects information on the failure received from the failure detection unit 6a of the own system or the information collection unit 7b of the other system, and outputs the collected information to the sequencer 8a of the own system and the information collection unit 7b of the other system. The collection unit. Similarly, the information about the failure received from the failure detection unit 6b of the own system or the information collection unit 7b of the other system, that is, the event information is collected, and the collected event information is also collected by the sequencer 8b of the own system and the other system. This is an information collecting unit that outputs to the information collecting unit 7a.

Each of 8a and 8b has a state transition table, receives event information from the information collecting units 7a and 7b, extracts a control command corresponding to the received event information from the state transition table, and switches the switching control unit 4 and the signal. Processing unit 5a or 5
This is a sequencer that outputs to b. This sequencer 8a,
8b has a storage unit composed of storage elements such as a RAM, a ROM, and an EEPROM, and a state transition table is stored in the storage unit. The state transition table stores a control command corresponding to the current state and the received event information, and information on an internal state to be transited next. 9a is a signal processing unit 5
a, failure detection unit 6a, information collection unit 7a, sequencer 8a
9b is a 1-system interface board as a first transmission control unit including a signal processing unit 5b, a failure detection unit 6b, an information collection unit 7b, and a sequencer 8b. It is. Reference numeral 9 denotes a local station interface package, which includes a plurality of system interface boards 9a and 9b which are active or standby systems.

The transmission device 2 for the game is basically also the transmission device 1
, And the game interface package 10 has the same structure as the own station interface package 9. Here, the information collecting unit 7a and the sequencer 8a
Constitutes a first control unit, and the internal state information held by the information collecting unit 7a and the sequencer 8a is the first internal state information. The information collecting unit 7b and the sequencer 8b constitute a second control unit, and the internal state information held by the information collecting unit 7b and the sequencer 8b is the second internal state information.

FIG. 2 is a sequence diagram showing communication and operation at the time of switching processing according to the first embodiment of the present invention. 2, the same reference numerals as those in FIG. 1 represent the same or corresponding parts.

Next, the operation of the transmission apparatus 1 will be described with reference to FIGS. Here, it is assumed that the 0-system interface board 9a operates as the active system and the 1-system interface operates as the standby system. In the communication step S0, during the normal operation in which data transmission processing is being performed between the transmission device 1 and the transmission device 2, the failure detection unit 6a
Are constantly detecting the operation of the signal processing unit. During this communication, the transmission apparatus 1, the opposite transmission apparatus 2, and the transmission path 3a
-The active system interface board 9a and the standby system interface board 9b according to the operation state such as the failure of the 3b.
Changes its internal state.

When the internal state of one interface board changes while the communication step S0 is being performed, a synchronous step S1 is executed in order to similarly change the internal state of the interface board of the other system. By the synchronization step S1, the active interface board 9a and the standby interface board 9b maintain the same internal state.

Here, for example, when the signal input to the signal processing unit 5a from the transmission line 3a used as the working system is interrupted, the process proceeds to step S2, where the failure detecting unit 6a determines that the signal is interrupted, Is detected. The information collecting unit 7a outputs a failure detection result (SF dete
ct) and the active system, ie, the own system sequencer 8
A failure detection result, that is, event information is output to a. Upon receiving the event information, the active sequencer 8a switches the internal state to the SF response RR waiting state. At this time, the information collecting unit 7a also outputs a failure detection result to the standby information collecting unit 7b. The standby information collecting unit 7b that has received the detection result outputs the received detection result to the standby sequencer 8b. Therefore, the same event information is output to the active sequencer 8a and the standby sequencer 8b.

Next, in step S3, the sequencer 8b receiving the event information sets the standby signal processing unit 5b
Then, the SF (Signal Fail) signal is output to the standby signal processor 5b that has received the SF signal, and transmits the SF signal to the interface package 10 of the opposite station via the transmission path 3b. Here, the signal processing unit 5b of the standby system performs step S1.
Based on the updated internal state information (here, the initial state shown in step S10 of FIG. 5 described later) and the SF detect event information output in the failure detection step S2, the SF signal is transmitted to the opposite station. Send to device. Upon receiving the event information (SF detect), the standby interface board 9b outputs the inter-station switching command (SF signal) based on the already updated internal state.
A switching process can be performed. The SF signal is one of the inter-station switching commands, and is an error signal for notifying that the signal from the transmission path has been interrupted.

When the sequencer 8b outputs the SF signal, the sequencer 8b updates its internal state to a state of waiting for an SF response RR signal from the transmission device 2 of the opposite station in order to wait for the end of the switching processing of the opposite station. This updating of the internal state is performed in step S1.
This is performed based on the internal state information updated in step S2 and the event information SF detect output in the failure detection step S2. As a result of this switching process, the active sequencer 8a and the standby sequencer 8b have the same internal state (SF response RR signal waiting state), as in the above-described synchronization step S0.
Will have been updated. That is, this step S3
Also serves as a synchronization step for the next event.

Next, in step S4, the signal processing unit 5b
The SF signal is transmitted from the game interface package 10 to the signal processing unit, the failure detection unit, the information collection unit, and the sequencer (not shown) in the game interface package 10, and the switching not shown in the game interface package 10 is performed. A switching signal is output to the control unit to perform a switching process. Then, when the switching process is completed,
The RR signal is transmitted from a signal processing unit (not shown) to the interface package 9 of the transmission device 1 via the transmission path 3b. It should be noted that a known transmission device that operates using the same communication protocol as the transmission device 1 can be used as the transmission device 2 for the game, and it is not necessarily required that the transmission device has the above-described configuration.

In step S5, the standby signal processing unit 5b that has received the RR signal performs
The internal state (SF response R) updated in step S3
A switching signal is output to the switching controller 4 based on an R signal waiting state) and an event signal generated by the inter-station switching command (RR signal) transmitted in step S4. Upon receiving this switching signal, the switching control unit 4 switches the built-in switch as a switching step, and changes the input source of the output signal. That is, the active signal processing unit 5a
The signal received from the standby signal processing unit 5b is output to the subscriber interface package or the like as an output signal from the state where the signal received from the unit is output to the subscriber interface package or the like (not shown). Switching is performed so that the signal received from 5a is not output as an output signal. When this step S5 is completed, the 1-system interface board 9b processes the signal from the transmission apparatus 2 of the opposite station instead of the 0-system interface board 9a.

In the above description, the switching process from the state where the working and protection transmission lines 3a and 3b are operating normally (ie, the internal state is the initial state) has been described.
However, for example, when communication is being performed on the active transmission line 3a, a device related to the standby transmission line 3b, for example,
When a failure is detected in the standby interface board 9b, the active and standby interface boards 9a,
The internal state of 9b is updated to the state of the standby system abnormality.
In this case, the active system interface board 9a
Even if a minor failure is detected, the communication using the backup transmission line 3b is not performed unlike the above description of the operation.
Other processing such as issuing a signal retransmission request using the transmission line 3a of the working system can be performed. Therefore, both transmission paths 3a,
3b can be realized at a high speed in accordance with a state where the transmission line 3b is normal and the standby transmission line is abnormal.

In the above description of the operation, the working transmission line 3a
Has been described above, the process of switching from the transmission by the protection system transmission line 3b to the transmission by the protection system transmission line 3b is also performed in accordance with a known protocol. Done.

Details of Operations of Information Collection Unit and Sequencer Next, more detailed operations of the information collection unit 7a and the sequencer 8a will be described with reference to FIG. FIG. 3 is a functional block diagram showing the information collecting unit 7a and the sequencer 8a. 3, the same reference numerals as those in FIG. 1 denote the same or corresponding parts. Reference numeral 7a1 denotes an information collection control unit that receives event information from the failure detection unit 6a and the like, notifies the standby information collection unit 7b, and outputs an address corresponding to the received event to the sequencer 8a. here,
The event information is a notification about a failure that is output when the failure detection unit 6a detects a failure, an inter-station switching command transmitted from the transmission apparatus 2 of the opposite station, and a timer provided in the 0-system interface board 9a ( (Not shown) transmitted from the transmission apparatus 1 of the own station or a notification from the transmission apparatus 2 of the opposite station. 7a2 receives the data output by the sequencer 8a, and in accordance with the received data, a switching signal;
It is a signal generation unit that generates and outputs K1 and K2 signals as inter-station switching commands.

The sequencer 8a has a ROM (Read Only Memory).
y), and a state transition table as shown in FIG. 4 is stored. In the state transition table of FIG. 4, more internal states and events are provided according to the function of the transmission device. In FIG. 4, the internal state represents the state of the transmission device 1, and here, a 3-bit identification code is assigned. That is, 000 represents the initial state, and 001 is SF
Waiting for the response RR, 010 is assigned to wait for the active system recovery REF2. On the other hand, an identification code is also assigned to each event, and as shown in FIG. 4, 000000 is SF detect, 00001 is REF2,
00010 is assigned as RR recieve.

Here, the three bits representing the internal state are assigned to the upper three bits.
In the address where the 5 bits representing the event and the 5 bits representing the event are the lower 5 bits following the upper 3 bits, the internal state indicated by the upper 3 bits, the next internal state when the event indicated by the lower 5 bits occurs And the control command output at that time. The bit configuration of the stored data is such that the upper three bits are the next internal state and the lower five bits are the control instruction. The control commands include, for example, an NB (No Bridge Required) signal output command assigned to 00001, an SF signal output command of 00010, and a WR (Wait Requests).
t) There is a signal output command, etc. Here, the number of bits allocated to each of the internal state, the event, and the control instruction is allocated as described above. However, the number of bits is determined by the total number of possible states of the internal state, the event, and the control instruction. Assigned according to

FIG. 5 shows the interface boards 9a and 9b.
FIG. 6 is a sequence diagram for explaining communication between the devices and transition of the internal state. In FIG. 5, the same reference numerals as those in FIG. 1 represent the same or corresponding parts.

Next, the operation when the failure detector 6a detects SF will be described. First, the 0-system interface board 9a and the 1-system interface board 9b are maintained in the same internal state by communication between the information collecting units 7a and 7b. Here, it is in the initial state.

When the failure detection unit 6a detects SF, SF
The event information of detect is output to the information collecting unit 7a.
This signal is received by the information collection control unit 7a1, and the received event information is output to the standby information collection unit 7b.
Further, the information collection control unit 7a1 outputs the received event information as an address to the sequencer 8a, and outputs a read signal to the sequencer 8a (ROM). Prior to the output of the read signal, the upper three bits of the data output from the sequencer 8a indicate the above-described internal state, and are combined with the lower five bits indicating the event information output by the information collection controller 7a1. One generated address is provided to the sequencer 8a. Therefore, the sequencer 8a can output the storage content of the given address as data to the information collection unit 7a. The output data is such that the upper 3 bits have the sequencer 8a as described above.
Is output as the upper 3 bits of the address, and the lower 5 bits are received by the signal generator 7a2. Upon receiving the lower 5 bits of the data, the signal generator 7a2 generates a necessary switching signal,
Alternatively, it generates and outputs K1 and K2 as switching commands between stations. Also, by outputting the upper 3 bits as the address of the sequencer 8a, the internal state changes from the initial state to SF.
The state is updated to the signal RR waiting state.

The above operation is an operation of the active information collection unit 7a. However, when a failure occurs in the active transmission line 3a, such as when an SF detect event occurs, In the active signal processing unit 5a, the opposite transmission device 2 is used.
Cannot transmit the SF signal as shown in FIG. Therefore, in this case, the protection transmission line 3b
Therefore, the operation of the standby interface port 9b becomes important because the SF signal is transmitted using the communication interface.

The operation of the standby information collection unit 7b and sequencer 8b will be described below with reference to FIG. In the above description of the operations of the active information collection unit 7a and the sequencer 8a, FIG. 3 is described as the active information collection unit 7a and the sequencer 8a. However, the standby information collection unit 7b and the sequencer 8b have the same configuration. Therefore, the operation of the standby system will be described with reference to FIG. In FIG. 3, 7b1 is
Except for being connected to the information collecting unit 7b instead of the information collecting unit 7a, connected to the fault detecting unit 6b instead of the fault detecting unit 6a, and connected to the sequencer 8b instead of the sequencer 8a, An information collection control unit 7b2 similar to the information collection unit 7a1, a sequencer 8b instead of the sequencer 8a, and a signal processing unit 5b instead of the signal processing unit 5a
, Except that it is connected to the working signal generator 7a.
2 is a signal generation unit similar to that of FIG.

The active information collection control unit 7a1 sends the SF de
The information collection control unit 7b1 that has received the tect event signal (Step S11 in FIG. 5) outputs an address corresponding to the SF detect event to the sequencer 8b, and outputs a read signal. Here, since the sequencer 8b receives the same event information as the active sequencer 8a every time an event occurs in the active system, the same internal state as the active sequencer 8a, here the initial state (step S1)
0). At this time, the active sequencer 8
As described in the operation a, the upper three bits of the previously output data indicate the current internal state, and the upper three bits of the address are used.
Given as bits.

As described above, since the 1-system interface board 9b has the same internal state as the 0-system interface board 9a, the operation corresponding to the event information in the current state is known, and when an event occurs. ,
The operation corresponding to the event can be immediately executed. In the prior art, an event is monitored and
7, the internal state of the 0-system interface board needs to be transferred to the 1-system interface board via the monitoring control unit 17. Further, after detecting an abnormality, a process of shifting the internal state is required. In the first embodiment, 0
Since both the system interface board 9a and the system interface board 9b have the same internal information in advance, there is no work of transferring the internal information after the event occurs, and the operation can immediately proceed to the operation corresponding to the event.
The switching process can be performed at high speed.

Upon receiving the read signal from the information collection control unit 7b1, the sequencer 8b stores an address composed of the upper 3 bits representing the internal state and the lower 5 bits representing the event given from the information collection control unit 7b1. The data is output to the information collecting unit 7b. As shown in FIG. 4, the output storage data contains the next internal state in the upper three bits and the control instruction in the lower five bits. The signal generation unit 7b2 that has received the lower 5 bits of the control command from the sequencer 8b generates and outputs a switching signal or an inter-station switching command K1 or K2 according to the received control command. Furthermore, of the output data of the sequencer 8b, the upper three bits are given as the address of the sequencer 8b, and the internal state of the interface board 9b of the first system is updated. Since the event information is also output to the 0-system interface board 9a, the internal state is similarly updated in the 0-system interface board 9a. Here, the internal status of both the interface boards 9a and 9b is SF response.
The state is updated to the RR waiting state (step S12).

For example, when the SF is detected by the failure detection unit 6a in the initial state, the SF detect event occurs as described above, and the address of 000000 is given to the sequencer 8b as the lower 5 bits. In the initial state, the upper 3 bits of the address are 000, so that the data of the address “000000000”, that is, “001 00010” is output from the sequencer 8b as a whole.

Lower 5 bits of data output by sequencer 8b
The signal generation unit 7b2 that has received the bit detects the value of “00010” as the control command, and
1, K2 information is generated and output to the signal processing unit 5b. Since the K1 and K2 information is known information, K1 and K2
The generation of the information can be performed by a known method. The signal processing unit 5b having received the K1 and K2 information including the SF signal transmits the K1 and K2 information including the SF signal to the transmission apparatus 2 of the opposite station as described in step S3 of FIG. Here, the upper three bits “001” of the data output by the sequencer 8b are given again as the address of the sequencer 8b. “001” indicates the SF response RR waiting state, and the internal state is updated from the initial state to the SF response RR waiting state.

In step S4 of FIG. 2, when the RR signal is transmitted from the opposite transmission device 2, reception of the RR signal is transmitted from the signal processing unit 5b via the failure detection unit 6b, and the information collection control unit 7b1 is notified of RR receive event information. The information collection control unit 7b1 transmits the event information to the information collection control unit 7a1 (step S13), and outputs an address “00010” corresponding to the RR recieve event to the sequencer 8b, and outputs a read signal. At this time, the upper 3 bits of the address are S
Since it is “001” indicating the F response RR waiting state, the data “011 001” of the address “001 00010”
00 ”is output. Therefore, the internal state of the first system interface board 9b is changed to the active system recovery REF2 wait state (step S14). Since the RR recieve event is notified in step S13, the internal state of the 0-system interface board 9a is also changed to the active system recovery RE.
The state changes to the F2 waiting state (step S14).

Next, in step S5 in FIG. 2, the signal generating unit 7b2, which has received the lower 5 bits of the data output by the sequencer 8b, performs a process defined as an operation corresponding to the received value "00100". That is, a switching signal is output to the switching control unit 4. Upon receiving the switching signal, the switching control unit 4 performs the switching process of changing the input source of the output signal as described in step S5.

Although not shown in FIG. 2, the standby system performs signal processing in place of the active system until the active system recovers, operating in the same manner. Similarly, in the switching operation from the standby system to the active system, the sequencers 8a, b and the information collecting units 7a, b operate to perform the switching process. As shown in step S26 of FIG. 5, even when the standby transmission line 3b is used for communication with the transmission device 2, the 0-system interface board 9
“a” monitors whether or not the working transmission path 3a has recovered. When the active failure detection unit 6a detects the recovery of the transmission line 3a, an event of REF2 indicating the recovery is output to the information collecting unit 7a, and the information collecting unit 7a receiving the event of REF2 is connected to the 0-system interface board. Is changed (step S16), the event of REF2 is notified to the 1-system interface board 9b, and the internal state of the 1-system interface board 9b is also changed. Here, the internal state changes to a recovery protection time end waiting state for securing the recovery protection time (step S16). Step S2
7 and thereafter, the switching operation from the standby system to the active system is performed. The switching process performed between the transmission device 1 and the transmission device 2 is performed according to a well-known protocol, and a description thereof will be omitted.

Here, even when the standby system, that is, the 1-system interface board 9b is used for communication with the transmission apparatus 2, the working system, that is, the 0-system interface board 9a similarly has an internal state. Because we are switching
It is possible to immediately proceed to the operation corresponding to the event in the current state, and the switching process can be performed at high speed.

Embodiment 2 Next, an embodiment for comparing information received by the active interface board with information received by the standby interface board in order to improve communication reliability will be described. In the second embodiment, the transmission apparatus 2 of the opposite station outputs the same inter-office system switching command to both the transmission path 3a of the working system and the transmission path 3b of the protection system. The second transmission apparatus 1 aims to improve reliability by receiving an inter-station switching command from the opposite transmission apparatus 2 without error.

FIG. 6 is a functional block diagram showing a transmission apparatus according to the second embodiment of the present invention. In FIG.
The same reference numerals as those in FIG. 1 indicate the same or corresponding parts. 10, K1 and K2 received from the failure detection unit 6a
The information is compared with the K1 and K2 information received from the failure detection unit 6b, and when they match, the information collection unit 7a
And an inter-office system switching instruction comparison unit that outputs the K1 and K2 information received to the communication units 7b and 7b. Here, the K1 and K2 information is also called an inter-office system switching command (APS byte), and the transmission path 3a,
This is a well-known switching command exchanged between the transmission device 1 and the transmission device 2 when switching 3b. The information collection unit 7
a and the sequencer 8a constitute a switching signal control unit, and the information collecting unit 7b and the sequencer 8b also constitute a switching signal control unit.

Next, based on FIG.
The operation of the transmission device 1 of the own station when there is a switching request from the server will be described. When the transmission device 2 of the opposite station stops communication using the transmission line 3a of the active system and switches to communication using the transmission line 3b of the standby system, both of the transmission lines 3a and 3b
Output K1 and K2 information. K on the working transmission line 3a
The 1 and K2 information are output to the inter-station switching instruction comparison unit 10 via the signal processing unit 5a and the failure detection unit 6a. on the other hand,
The K1 and K2 information on the backup transmission line 3b is output to the inter-office system switching command comparison unit 10 via the signal processing unit 5b and the failure detection unit 6b.

The inter-office system switching command comparison unit 10 receives the K1 and K2 information received from the failure detecting unit 6a, that is, the first inter-office system switching command and the K1 and K2 information received from the failure detecting unit 6b.
K2 information, that is, a second inter-station switching command,
If they match, the received K1 and K2 information is output to the information collecting units 7a and 7b. If they do not match, it is determined that a transmission error has occurred in one of the transmission paths 3a and 3b, and the information collection units 7a and 7b send the received K1,
Do not output K2 information. That is, the information collecting units 7a and 7
b, it does not output erroneous K1 and K2 information to the sequencers 8a and 8b. Therefore, the 0-system interface board 9
The a and the 1-system interface board 9b can retain the previous internal state without erroneously updating the internal state. At this time, the fact that a transmission error has occurred may be notified to the transmission device 2 and the K1 and K2 information may be retransmitted.

The information collection units 7a and 7b perform switching control using the received K1 and K2 information. The switching control procedure is the same as the well-known protocol.
The operations of a.7b, the sequencers 8a and 8b, and the switching control unit 4 are as described in the first embodiment. However, since the information received from the failure detection unit 6a or the failure detection unit 6b has already been sent to both information collection units 7a and 7b via the inter-station switching instruction comparison unit 10, the information collection unit 7
A and 7b need not be transmitted again to the information collection units 7b and 7a of other systems.

When one of the transmission paths becomes unable to perform communication for a predetermined time or longer, the inter-office switching command comparison unit 10 does not perform the comparison and receives the signal from one of the transmission paths. Information collection unit 7a for inter-station switching instruction
7b may be output.

According to the second embodiment, the K1 and K2 information, that is, the inter-office system switching command is transmitted through the working and protection transmission lines 3a and 3b. Compare the inter-station switching command. When they match, the command is received as a normal command, and when they do not match, it is determined to be abnormal and rejected, so that a transmission error of the inter-station switching command can be found. Therefore, the reception accuracy of the inter-station switching instruction is improved, the possibility of erroneous transmission line switching is greatly reduced, and the reliability of communication is improved.

When the inter-station switching command comparing unit 10 detects a transmission error, a restart request may be transmitted to the opposite station in order to initialize the transmitting apparatus 2 of the opposite station. That is, when a transmission error is detected, the inter-station switching instruction comparison unit 10 outputs a restart request signal to the signal processing units 5a and 5b. The signal processing units 5a and 5b that have received this signal transmit the signals to the respective transmission paths 3a or 3b
To output a restart request to the transmission apparatus 2 of the opposite station. Upon receiving this restart request, the transmission device 2 initializes its own device and performs a restart.

When the restart is performed, the abnormal state is reset, the possibility of recovery is high, and the suspension of communication can be prevented. Therefore, a more reliable communication system can be constructed.

[0060]

Since the present invention is configured as described above, it has the following effects.

According to the transmission line switching device of the present invention, the first signal processing unit for transmitting and receiving signals using the opposite transmission device and the first transmission line, and the transmission / reception using the first transmission line. A first failure detection unit that detects an abnormality and outputs event information corresponding to the type of the detected abnormality, and a first internal state information indicating a processing state of a communication process with the transmission apparatus of the opposite station; The first internal state information is updated based on the event information or an inter-station switching command from the opposite transmission apparatus, and the first signal processing unit is controlled based on the first internal state information. A first transmission control unit having a first control unit, a second signal processing unit for transmitting and receiving signals using the opposite transmission device and a second transmission path, and communication with the opposite transmission device. Contains second internal state information indicating the processing state of the processing. The second internal state information is updated to information representing the same internal state as the updated first internal state information, and the event information from the first failure detection unit, which has occurred after the update, and the updated A second control unit that outputs a switching signal based on the second internal state information; a second transmission control unit including a second control unit that outputs a switching signal based on the second internal state information; and a signal received by the first signal processing unit based on the switching signal. Or a switching unit that selects and outputs any of the signals received by the second signal processing unit, so that when a failure occurs, the switching process can be performed at high speed, and the reliability is high. A transmission line switching device can be obtained.

The second transmission control unit has a second failure detection unit that detects an abnormality in transmission / reception using the second transmission path and outputs event information according to the type of the detected abnormality. , The second control unit, when the second failure detection unit outputs event information or when the inter-station switching command is output from the opposite transmission device, the second failure detection unit Based on the output event information or the inter-office switching command, an update process for updating the second internal state information is performed, and the first control unit performs a process when the second control unit performs the update process. Updating the first internal state information to information representing the same internal state as the updated second internal state information, and updating the event information from the second failure detection unit, which has occurred after the update, and the updated The switching signal is generated based on the first internal state information. Therefore, when a failure occurs, switching from the first system to the second system and from the second system to the first system can be performed at high speed, and a highly reliable transmission line switching device can be obtained. it can.

Further, the second control unit stores an address generated based on the event information and the second internal state information,
Since it has a storage unit that stores the internal state information and control instructions corresponding to the event information and the second internal state information, unlike the software control using a processor that requires execution of many instructions and memory access, the event information By reading data using the internal state information as address information, the next internal state and control command can be immediately obtained, and a very high-speed control unit can be obtained.

Also, a first signal processing unit for receiving a signal transmitted from the transmission apparatus of the opposite station using the first transmission path,
A second signal processing unit for receiving a signal transmitted from the transmission apparatus of the opposite station using the second transmission path, and extracting a first inter-station switching command from the signal received by the first signal processing unit And extracting a second inter-station switching command from the signal received by the second signal processing unit, and determining whether the first inter-station switching command matches the second inter-station switching command. And a switching signal is output based on the inter-station switching command when the inter-station switching command comparing unit determines that they match, and when it is determined that they do not match, the switching is performed. A switching signal control unit that does not output a signal, a signal received by the first signal processing unit, and a signal received by the second signal processing unit, based on a switching signal output by the switching signal control unit. , The signal received by the first signal processing unit, or Because having a switching unit for selecting and outputting one of the second signal by the signal processing unit receives, the,
Since the inter-station switching command obtained from the two transmission paths is compared, a transmission error of the inter-station switching command can be detected,
Since erroneous processing can be prevented from occurring, a highly reliable transmission line switching device can be obtained.

According to the transmission line switching method of the present invention, communication is performed between the transmission device of the opposite station and the first signal processing unit connected to the transmission device of the opposite terminal via the first transmission line. A communication step of updating the internal state of the first transmission control unit for monitoring the state of the communication; and a communication step between the transmission apparatus of the opposite station and a second signal processing unit connected via a second transmission path. A synchronization step of synchronizing the internal state of the second transmission control unit for monitoring the state with the internal state of the first transmission control unit updated in the communication step, and, after the synchronization step, the first transmission path. A control step of outputting a switching signal based on the information of the failure that has occurred and the internal state of the second transmission control unit synchronized in the synchronization step, and a switching unit that receives the switching signal outputs a signal to be output, Sent from the first signal processing unit. And a switching step of switching from the output signal to the signal transmitted from the second signal processing unit, so that a high-speed switching process can be performed when a failure occurs, and a highly reliable transmission path switching device. Can be obtained.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing a transmission device according to Embodiment 1 of the present invention.

FIG. 2 is a sequence diagram showing communication and operations at the time of a switching process according to the first embodiment of the present invention.

FIG. 3 is a functional block diagram illustrating an information collection unit and a sequencer according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a state transition table according to the first embodiment of the present invention.

FIG. 5 is a sequence diagram showing communication between interfaces and transition of an internal state according to the first embodiment of the present invention.

FIG. 6 is a functional block diagram showing a transmission device according to a second embodiment of the present invention.

FIG. 7 is a functional block diagram illustrating a transmission device according to a conventional technique.

[Explanation of symbols]

1 transmission device of own station, 2 transmission device of opposite station, 3a,
3b transmission line, 4 switching control unit, 5a, 5b signal processing unit, 6a, 6b failure detection unit, 7a, 7b information collection unit, 8a, 8b sequencer, 9 own station interface package, 9a, 9b interface board, 10 between stations System switching instruction comparison unit.

Claims (5)

[Claims] A first signal processing unit for transmitting and receiving a signal using a first transmission path and a transmission apparatus of a game; detecting a transmission and reception abnormality using the first transmission path; A first failure detection unit that outputs event information according to the type;
A first status indicating the processing state of the communication process with the transmission device of the above-mentioned game.
And updates the first internal state information on the basis of the event information or the inter-station switching command from the opposite transmission apparatus, and updates the first internal state information based on the first internal state information. A first transmission control unit having a first control unit for controlling one signal processing unit, a second signal processing unit for transmitting and receiving signals using the transmission device of the opposite station and a second transmission path, Information representing the same internal state as the updated first internal state information, the second internal state information having a second internal state information indicating a processing state of the communication processing with the transmission apparatus of the opposite station; And a second control unit that outputs a switching signal based on the event information generated after the update from the first failure detection unit and the updated second internal state information. Transmission control unit based on the switching signal The first signal the signal processing unit receives, or, the switching unit for selecting and outputting one of said second signal by the signal processing unit receives the transmission path switching device provided with a. 2. The second transmission control unit has a second failure detection unit that detects an abnormality in transmission / reception using the second transmission path and outputs event information according to the type of the detected abnormality. The second control unit, when the second failure detection unit outputs the event information or when the inter-station switching command is output from the opposite transmission device, the second failure detection unit An update process for updating the second internal state information is performed based on the output event information or the inter-station switching instruction, and the first control unit performs the update process when the second control unit performs the update process. Updating the first internal state information to information representing the same internal state as the updated second internal state information, and updating the event information from the second failure detection unit, which has occurred after the update, and the updated Outputs a switching signal based on the first internal state information Transmission path switching apparatus as claimed in claim 1, characterized in Rukoto. A second controller configured to store the event information and the second information;
3. An address generated based on the internal state information of (a), a storage unit storing internal event information and control instructions corresponding to the event information and the second internal status information. A transmission path switching device according to item 1. 4. A first signal processing unit for receiving a signal transmitted from a transmission apparatus on the opposite side using the first transmission path, and a signal transmitted from the transmission apparatus on the opposite side using the second transmission path. And a second signal processing unit for receiving a first inter-station switching command from the signal received by the first signal processing unit, and extracting a second inter-office system switching command from the signal received by the second signal processing unit. An inter-office system switching instruction comparison unit for extracting whether or not the first inter-office system switching instruction matches the second inter-office system switching instruction; A switching signal control unit that outputs a switching signal based on an inter-station switching command when the command comparing unit determines that they match, and that does not output the switching signal when it determines that they do not match; the first signal processing unit And the signal received by the second signal processing unit. And selecting and outputting either the signal received by the first signal processing unit or the signal received by the second signal processing unit based on the switching signal output by the switching signal control unit. A transmission path switching device comprising: a switching unit. 5. A first communication device for performing communication between a transmission device of a game and a first signal processing unit connected to the transmission device of the game via a first transmission path, and monitoring a state of the communication. A communication step of updating an internal state of the transmission control unit, and a second transmission control for monitoring a state of communication between the transmission apparatus of the opposite station and a second signal processing unit connected via a second transmission path. A synchronization step for synchronizing the internal state of the unit with the internal state of the first transmission control unit updated in the communication step; information on a failure occurring in the first transmission path after the synchronization step; A control step of outputting a switching signal based on the internal state of the second transmission control unit synchronized with the above, and a switching unit that receives the switching signal outputs a signal
A switching step of switching from a signal transmitted from the first signal processing unit to a signal transmitted from the second signal processing unit.