CN108337113B - Transmission line switching device and method - Google Patents
Transmission line switching device and method Download PDFInfo
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- CN108337113B CN108337113B CN201810031778.7A CN201810031778A CN108337113B CN 108337113 B CN108337113 B CN 108337113B CN 201810031778 A CN201810031778 A CN 201810031778A CN 108337113 B CN108337113 B CN 108337113B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0663—Performing the actions predefined by failover planning, e.g. switching to standby network elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/20—Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles
- H04Q1/22—Automatic arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0668—Management of faults, events, alarms or notifications using network fault recovery by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q1/00—Details of selecting apparatus or arrangements
- H04Q1/18—Electrical details
- H04Q1/30—Signalling arrangements; Manipulation of signalling currents
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- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
Abstract
The invention provides a transmission line switching device and method, which can shorten the time for restarting communication. When there is no request for transmitting a message in the communication terminal device group (2) and the state where the current does not flow through the transmission line of the A system (transmission line of the main system) (3) continues for a predetermined time (T) (e.g., 5ms) or longer, the transmission line of the B system (backup system) (4) is switched to the transmission line of the main system (the main system is switched from the A system to the B system by setting the switch (5) to the interval state and setting the switch (6) to the flag state). Thus, when the next message is transmitted after the transmission line (4) of the B system (backup system) is switched to the transmission line of the main system, the time for resuming communication can be shortened without waiting for the voltage (VS') inside the power supply device (1) to be adjusted to be stable.
Description
Technical Field
The present invention relates to a transmission line switching apparatus and method used in a communication system that performs communication by a current loop method.
Background
Conventionally, a communication system that performs communication by a current loop method has been used. The current loop method is a communication method for transmitting a signal in accordance with a change in a current value, and is a communication method for transmitting a communication signal to a communication terminal device connected to a transmission line in accordance with ON (e.g., 30mA) and OFF (e.g., 2mA) of a loop current.
In this communication system, a communication signal when the loop current is ON is referred to as a Mark (Mark) signal, a loop current at this time is referred to as a Mark current, a communication signal when the loop current is OFF is referred to as a Space (Space) signal, and a loop current at this time is referred to as a Space current (see, for example, patent document 1).
Fig. 8 is a diagram showing an example of a conventional communication system in which a transmission line is duplicated by a current loop method. In the figure, 1 denotes a power supply device, 2 denotes a communication terminal device group, and a transmission line between the power supply device 1 and the communication terminal device group 2 is duplicated. That is, in the communication system 100, the power supply device 1 and the communication terminal device group 2 are connected via the transmission line 3 of the a system and the transmission line 4 of the B system.
Note that, although fig. 8 shows the communication terminal device group 2 divided into 2 pieces for convenience of explanation, the actual communication terminal device group 2 is 1 piece. The communication terminal device group 2 is composed of a master device, a slave device, and the like connected in series, and is connected as a common load to the transmission line 3 of the a system and the transmission line 4 of the B system.
In this example, the transmission line 3 of the a system is provided with a switch 5, and the transmission line 4 of the B system is provided with a switch 6. Transistors can be used as the switches 5, 6. The transmission line 3 of the a-system is set as a transmission line of the main system by setting the switch 5 to the flag state (state in which current easily flows). The transmission line 4 of the B system is set as a transmission line of the backup system by setting the switch 6 to the interval state (2mA or less) in which the current is not easily flowed).
In the communication system 100, the communication terminal apparatus group 2 transmits a message by changing the value of the current flowing through the transmission line 3 of the a-system (main system), that is, by turning the loop current of the transmission line 3 of the a-system (main system) ON (for example, 30mA) or OFF (for example, 2 mA).
[ transfer line switching device ]
As shown in fig. 9, the communication system 100 is provided with a transmission line switching device 7. The transmission line switching device 7 monitors whether or not there is a transmission request for a message in the communication terminal device group 2, and if there is a transmission request for a message, confirms whether or not a loop is established between the transmission line 3 of the a system (primary system) and the transmission line 4 of the B system (backup system) immediately before the transmission of the message.
Here, when the loop of the transmission line 3 of the a system (primary system) is not established and the loop of the transmission line 4 of the B system (backup system) is established, it is determined that the transmission line 3 of the a system (primary system) is disconnected, and the transmission line 4 of the B system (backup system) is switched to the transmission line of the primary system (see fig. 10). That is, the main system is shifted from the a system to the B system by setting the switch 5 to the space state and the switch 6 to the flag state.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 11-68856
Patent document 2: japanese patent No. 4451718
Disclosure of Invention
Technical problem to be solved by the invention
Recently, a method of adjusting an internal voltage VS' according to a load is adopted as the power supply device 1 (for example, see patent document 2). If this method is adopted, the voltage adjustment work is not performed, and the operability is excellent, but on the other hand, a period from when the communication terminal device group 2 is connected to when the voltage VS' inside the power supply device 1 is stabilized (maximum 2 seconds) occurs during which communication cannot be performed.
Since it is rare that communication is required immediately after the communication terminal device group 2 is connected, it has no problem of itself. However, in the communication system 100 in which the transmission line is doubled, when the transmission line 3 of the system a (main system) is disconnected, the impedance load of the system a (main system) becomes extremely large, and the function of adjusting the voltage VS' inside the power supply device 1 becomes temporarily unstable. Therefore, when the transmission line 4 of the B system (backup system) is switched to the transmission line of the main system, there arises a problem that it takes time until the voltage VS' inside the power supply device 1 becomes stable, and the time until communication can be restarted becomes long.
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a transmission line switching apparatus and method that can shorten the time until communication can be restarted.
Means for solving the problems
In order to achieve the above object, the present invention relates to a transmission line switching device (7B) used in a communication system (200), the communication system (200) including: a 1 st transmission line (3); a 2 nd transmission line (4); a communication terminal device group (2) configured to transmit a message by changing the value of a current flowing through a transmission line of a main system, with a 1 st transmission line and a 2 nd transmission line being used as a transmission line of a main system and a transmission line of a backup system, respectively; and a power supply device (1) that supplies a power supply voltage to the 1 st transmission line and the 2 nd transmission line and adjusts an internal voltage in accordance with a load, wherein the transmission line switching device (7B) is configured to switch the 2 nd transmission line to a transmission line of a main system when an abnormality occurs in the 1 st transmission line, and wherein the transmission line switching device (7B) is characterized by comprising: and a transmission line switching unit (70, 70') configured to determine that an abnormality has occurred in the 1 st transmission line and switch the 2 nd transmission line to the transmission line of the master system when there is no message transmission request in the communication terminal device group and a state in which current does not flow through the 1 st transmission line continues for a predetermined time or longer.
According to the present invention, if there is no request for transmitting a message in the communication terminal device group and the state where the current does not flow through the 1 st transmission line (transmission line of the main system) continues for a predetermined time or longer, it is determined that an abnormality has occurred in the 1 st transmission line (transmission line of the main system), and the 2 nd transmission line (transmission line of the backup system) is switched to the transmission line of the main system.
Thus, in the present invention, the 2 nd transmission line (transmission line of the backup system) is switched to the transmission line of the main system while there is no transmission request of a message in the communication terminal apparatus group. The voltage inside the power supply device is also adjusted during a period in which there is no request for transmission of a message in the communication terminal device group. Therefore, when the next message is transmitted after the 2 nd transmission line (transmission line of the backup system) is switched to the transmission line of the main system, it is possible to shorten the time until the communication can be restarted without waiting until the adjustment of the internal voltage of the power supply apparatus is stabilized.
In the present invention, after the 2 nd transmission line (transmission line of the backup system) is switched to the transmission line of the main system, the 2 nd transmission line becomes the transmission line of the main system, and the 1 st transmission line becomes the transmission line of the backup system. That is, after the 2 nd transmission line (transmission line of the backup system) is switched to the transmission line of the main system, the 2 nd transmission line becomes the 1 st transmission line (transmission line of the main system) in the present invention, and the 1 st transmission line becomes the 2 nd transmission line (transmission line of the backup system) in the present invention.
In the above description, the components in the drawings corresponding to the components of the invention are indicated by parenthesized reference numerals, as an example.
Effects of the invention
As described above, according to the present invention, when there is no request for transmission of a message in the communication terminal device group and a state where current does not flow through the 1 st transmission line (transmission line of the main system) continues for a predetermined time or longer, it is determined that an abnormality has occurred in the 1 st transmission line (transmission line of the main system), and the 2 nd transmission line (transmission line of the backup system) is switched to the transmission line of the main system.
Drawings
Fig. 1 is a diagram showing a main part of a communication system using a transmission line switching device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram showing a hardware configuration of the transmission line switching device in the communication system.
Fig. 3 is a flowchart showing a processing operation performed by the CPU in the transmission line switching apparatus in example 1 (embodiment 1).
Fig. 4 is a diagram showing a state in which the transmission line of the B system (backup system) is switched to the transmission line of the main system (a state in which the main system is changed from the a system to the B system) by the transmission line switching device.
Fig. 5 is a functional block diagram of a main part of the transmission line switching apparatus that executes the processing operation according to embodiment 1.
Fig. 6 is a flowchart showing a processing operation performed by the CPU in the transmission line switching apparatus in example 2 (embodiment 2).
Fig. 7 is a functional block diagram of a main part of the transmission line switching device according to example 2 that executes the processing operation of embodiment 2.
Fig. 8 is a diagram showing an example of a conventional communication system in which a transmission line is duplicated by a current loop method.
Fig. 9 is a diagram for explaining a case where a transmission line of a B-system (backup system) is switched to a transmission line of a main system (a state before switching) in a conventional communication system.
Fig. 10 is a diagram for explaining a case where a transmission line of a B-system (backup system) is switched to a transmission line of a main system (switched state) in a conventional communication system.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Fig. 1 is a diagram showing a main part of a communication system 200 using a transmission line switching device according to an embodiment of the present invention. In this figure, the same reference numerals as those in fig. 9 denote the same or equivalent components as those described with reference to fig. 9, and the description thereof will be omitted.
Next, in order to distinguish from the transmission line switching device 7 in the conventional communication system 100 shown in fig. 9, the transmission line switching device 7 in the conventional communication system 100 is denoted by reference numeral 7A, and the transmission line switching device 7 in the communication system 200 of the present embodiment is denoted by reference numeral 7B.
In the communication system 200, as in the conventional communication system 100, the switch 5 is set to the flag state (state in which current is likely to flow) in the transmission line 3 of the system a, and the switch 6 is set to the gap state (state in which current is not likely to flow (2mA or less)) in the transmission line 4 of the system B. That is, the transmission line 3 of the a system is a transmission line of the main system, and the transmission line 4 of the B system is a transmission line of the backup system.
Fig. 2 shows a schematic hardware configuration of the transmission line switching device 7B. The transmission line switching device 7B includes a Central Processing Unit (CPU)7-1, a Random Access Memory (RAM)7-2, a Read Only Memory (ROM)7-3, interfaces 7-4 and 7-5, and a bus 7-6 connecting these devices.
The transmission line switching device 7B is provided with a transmission line switching program as a program unique to the present embodiment. The CPU7-1 operates in accordance with the installed transmission line switching program by processing information input via the interface 7-4 while accessing the RAM7-2 and the ROM 7-3.
[ embodiment mode 1 ]
Next, an explanation will be given of example 1 (embodiment 1) of the processing operation executed by the CPU7-1 in accordance with the transmission line switching program, using the flowchart shown in fig. 3.
In embodiment 1, the CPU7-1 confirms whether or not there is a transmission request for a message in the communication terminal device group 2 (step S101), and checks the current im (ia) flowing through the transmission line 3 of the a system (main system) when there is no transmission request for a message (step S102).
Here, when there is no request for transmitting a message in the communication terminal device group 2 (no in step S101) and a state where current does not flow through the transmission line 3 of the a system (main system) (a state where IM is 0) continues for a predetermined time T (for example, 5ms) or longer (yes in step S102), the CPU7-1 determines that a disconnection (abnormality) has occurred in the transmission line 3 of the a system (main system) (step S103), and switches the transmission line 4 of the B system (backup system) to the transmission line of the main system (step S104, see fig. 4). That is, the main system is changed from the a system to the B system by setting the switch 5 to the spaced state and the switch 6 to the flag state.
Thus, in the present embodiment, the transmission line 4 of the B-system (backup system) is switched to the transmission line of the main system while there is no transmission request of a message in the communication terminal apparatus group 2. The voltage VS' in the power supply device 1 is also adjusted during a period in which there is no request for transmission of a message in the communication terminal device group 2. Therefore, when the next message is transmitted after the transmission line 4 of the B system (backup system) is switched to the transmission line of the main system, the time until the communication can be restarted can be shortened without waiting until the adjustment of the voltage VS' inside the power supply device 1 is stabilized.
Fig. 5 is a functional block diagram of a main part of a transmission line switching device 7B according to example 1 (embodiment 1) that executes the above processing operation. In embodiment 1, the transmission line switching device 7B includes a message transmission request presence/absence confirmation unit 71, a system a transmission line current confirmation unit 72, and a line switching unit 73 as a transmission line switching unit 70.
In the transmission line switching unit 70, the message transmission request presence/absence confirmation unit 71 confirms the presence/absence of a message transmission request in the communication terminal device group 2. The a-system transmission line current confirmation unit 72 confirms whether or not the state where the current does not flow through the transmission line 3 of the a-system (main system) continues for a predetermined time T or longer. When the a-system transmission line current confirmation unit 72 confirms that the current does not flow through the transmission line 3 of the a-system (main system) for the predetermined time T or longer in a state where the message transmission request presence/absence confirmation unit 71 confirms that there is no message transmission request in the communication terminal device group 2, the line switching unit 73 determines that the transmission line 3 of the a-system (main system) is disconnected and switches the transmission line 4 of the B-system (backup system) to the transmission line of the main system.
In embodiment 1, after the transmission line 4 of the B-system (backup system) is switched to the transmission line of the main system, the transmission line 4 of the B-system becomes the transmission line of the main system, and the transmission line 3 of the a-system becomes the transmission line of the backup system. That is, before switching the transmission line 4 of the B system (backup system) to the transmission line of the primary system, the transmission line 3 of the a system is set to the 1 st transmission line (transmission line of the primary system) in the present invention, the transmission line 4 of the B system is set to the 2 nd transmission line (transmission line of the backup system) in the present invention, and after the switching, the transmission line 4 of the B system becomes the 1 st transmission line (transmission line of the primary system) in the present invention, and the transmission line 3 of the a system becomes the 2 nd transmission line (transmission line of the backup system) in the present invention.
[ embodiment 2 ]
Next, an example 2 (embodiment 2) of the processing operation executed by the CPU7-1 in accordance with the transmission line switching program will be described with reference to the flowchart shown in fig. 6.
In embodiment 1, a logic component is added which detects disconnection of the transmission line 3 of the a system (primary system) and switches the transmission line 4 of the B system (backup system) to the transmission line of the primary system during a period in which there is no transmission request of a message in the communication terminal apparatus group 2.
However, in embodiment 1, when the disconnection of the transmission line 3 of the a system (primary system) is detected, the transmission line 4 of the B system (backup system) is immediately switched to the transmission line of the primary system. At this time, when the transmission line 4 of the B system (backup system) is disconnected, the disconnection of the transmission line 4 of the B system (backup system) is detected as the disconnection of the transmission line of the main system, and the system immediately changes to return to the original state. Therefore, the transition from the a system to the B system and the transition from the B system to the main system of the a system are repeated until the disconnection is improved.
After the power supply is turned on, the time until the automatic adjustment of the voltage VS' in the power supply device 1 is completed is a state in which the overvoltage protection is active (maximum 2 seconds) and no current flows. Therefore, the transmission line 3 of the a system (main system) and the transmission line 4 of the B system (backup system) both become a state in which disconnection is detected. In such a case, the transition from the a system to the B system and the transition from the B system to the main system of the a system are repeated, and there is a possibility that malfunction may occur.
Therefore, in embodiment 2, when there is no request to transmit a message in the communication terminal device group 2 (no in step S201) and a state where the current does not flow through the transmission line 3 of the a system (main system) (a state where IM is 0) continues for a predetermined time T (for example, 5ms) or longer (yes in step S202), it is determined that a disconnection (abnormality) has occurred in the transmission line 3 of the a system (main system) (step S203), and then it is checked whether or not a loop of the transmission line 4 of the B system (backup system) is established (step S204).
Here, only when it is confirmed that the loop of the transmission line 4 of the B system (backup system) is established (yes in step S204), the transmission line 4 of the B system (backup system) is switched to the transmission line of the main system (step S205). That is, when the loop establishment of the transmission line 4 of the B system (backup system) is not confirmed (no in step S204), the transmission line 4 of the B system (backup system) is not switched to the transmission line of the main system.
Thus, only when the transmission line 4 of the B system (backup system) is normal, the transmission line 4 of the B system (backup system) is switched to the transmission line of the main system, and there is no problem that the transition of the main system is repeated.
Fig. 7 is a functional block diagram of a main part of a transmission line switching device 7B according to example 2 (embodiment 2) that executes the above processing operation. In embodiment 2, the transmission line switching device 7B includes a message transmission request presence/absence confirming unit 71, an a-system transmission line current confirming unit 72, a B-system transmission line confirming unit 74, and a line switching unit 75 as a transmission line switching unit 70'.
In the transmission line switching section 70', the message transmission request presence/absence confirmation section 71 confirms the presence/absence of a message transmission request in the communication terminal device group 2. The a-system transmission line current confirmation unit 72 confirms whether or not the state where the current does not flow through the transmission line 3 of the a-system (main system) continues for a predetermined time T or longer. The B-system transmission line confirmation unit 74 confirms whether the transmission line 4 of the B-system (backup system) is normal. When the a-system transmission line current confirmation unit 72 confirms that the current does not flow through the transmission line 3 of the a-system (primary system) for the predetermined time T or more in a state where the message transmission request presence/absence confirmation unit 71 confirms that there is no transmission request of a message in the communication terminal device group 2, the line switching unit 75 determines that the transmission line 3 of the a-system (primary system) is disconnected, and switches the transmission line 4 of the B-system (backup system) to the transmission line of the primary system on the condition that the B-system transmission line confirmation unit 74 confirms that the transmission line 4 of the B-system (backup system) is normal.
In embodiment 2, too, after the transmission line 4 of the B system (backup system) is switched to the transmission line of the main system, the transmission line 4 of the B system becomes the transmission line of the main system, and the transmission line 3 of the a system becomes the transmission line of the backup system. That is, before switching the transmission line 4 of the B system (backup system) to the transmission line of the primary system, the transmission line 3 of the a system is set to the 1 st transmission line (transmission line of the primary system) in the present invention, the transmission line 4 of the B system is set to the 2 nd transmission line (transmission line of the backup system) in the present invention, and after the switching, the transmission line 4 of the B system becomes the 1 st transmission line (transmission line of the primary system) in the present invention, and the transmission line 3 of the a system becomes the 2 nd transmission line (transmission line of the backup system) in the present invention.
[ extension of embodiment ]
The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. The configuration and details of the present invention can be variously modified within the scope of the technical idea of the present invention, which can be understood by those skilled in the art.
Description of the symbols
1 … power supply means; 2 … communication terminal device group (load), transmission line of 3 … a system; 4 … B system transmission line; 5. 6 … switch; 7(7B) … transmission line switching means; 7-1 … CPU; 7-2 … RAM; 7-3 … ROM; 7-4, 7-5 … interfaces; 70. 70' … transmission line switching part; 71 … message transmission request presence/absence confirmation unit; 72 … A system transmission line current confirmation part; 73 … a line switching part; 73. a 74 … B system transmission line confirmation unit; 75 … a line switching unit; 200 … communication system.
Claims (6)
1. A transmission line switching device used in a communication system, the communication system comprising:
1 st transmission line;
a 2 nd transmission line;
a communication terminal apparatus group configured to transmit a message by changing a value of a current flowing through a transmission line of a main system, with the 1 st transmission line and the 2 nd transmission line being a transmission line of a main system and a transmission line of a backup system, respectively; and
a power supply device that supplies a power supply voltage to the 1 st transmission line and the 2 nd transmission line and adjusts an internal voltage in accordance with a load,
the transmission line switching device is configured to switch the 2 nd transmission line to a transmission line of a main system when the 1 st transmission line is abnormal,
the transmission line switching device is characterized by comprising:
and a transmission line switching unit configured to determine that an abnormality has occurred in the 1 st transmission line and switch the 2 nd transmission line to a transmission line of a master system when there is no request for transmission of a message in the communication terminal apparatus group and a state where a current does not flow through the 1 st transmission line continues for a predetermined time or longer.
2. The transmission line switching device according to claim 1,
the transmission line switching unit is configured to determine that an abnormality has occurred in the 1 st transmission line when there is no request for transmission of a message in the communication terminal apparatus group and a state where a current does not flow in the 1 st transmission line continues for a predetermined time or longer, and to switch the 2 nd transmission line to a transmission line of a master system on the condition that the 2 nd transmission line is normal.
3. The transmission line switching device according to claim 1,
the transmission line switching unit includes:
a message transmission request confirmation unit configured to confirm whether or not a message transmission request is made in the communication terminal device group;
a 1 st transmission line current confirmation unit configured to confirm whether or not a state duration in which a current does not flow through the 1 st transmission line is equal to or longer than a predetermined time; and
and a line switching unit configured to determine that an abnormality has occurred in the 1 st transmission line and switch the 2 nd transmission line to a transmission line of a master system when the 1 st transmission line current confirmation unit confirms that a current has not flowed through the 1 st transmission line for a predetermined time or longer in a state where the message transmission request presence/absence confirmation unit confirms that there is no message transmission request in the communication terminal device group.
4. The transmission line switching device according to claim 1,
the transmission line switching unit includes:
a message transmission request confirmation unit configured to confirm whether or not a message transmission request is made in the communication terminal device group;
a 1 st transmission line current confirmation unit configured to confirm whether or not a duration of a state in which a current does not flow through the 1 st transmission line is equal to or longer than a predetermined time;
a 2 nd transmission line confirmation unit configured to confirm whether or not the 2 nd transmission line is normal; and
and a line switching unit configured to determine that the 1 st transmission line is abnormal when the 1 st transmission line current confirmation unit confirms that the duration of a state in which the 1 st transmission line current confirmation unit confirms that the current does not flow through the 1 st transmission line is equal to or longer than a predetermined time in a state in which the message transmission request presence/absence confirmation unit confirms that the message transmission request is not present in the communication terminal device group, and switch the 2 nd transmission line to a transmission line of a master system on the condition that the 2 nd transmission line confirmation unit confirms that the 2 nd transmission line is normal.
5. A transmission line switching method used in a communication system, the communication system comprising:
1 st transmission line;
a 2 nd transmission line;
a communication terminal apparatus group configured to transmit a message by changing a value of a current flowing through a transmission line of a main system, with the 1 st transmission line and the 2 nd transmission line being a transmission line of a main system and a transmission line of a backup system, respectively;
a power supply device that supplies a power supply voltage to the 1 st transmission line and the 2 nd transmission line and adjusts an internal voltage in accordance with a load,
the transmission line switching method switches the 2 nd transmission line to a transmission line of a main system when the 1 st transmission line is abnormal,
the transmission line switching method is characterized by comprising:
a transmission line switching step of, when there is no request for transmission of a message in the communication terminal apparatus group and a state where a current does not flow through the 1 st transmission line continues for a predetermined time or longer, determining that an abnormality occurs in the 1 st transmission line and switching the 2 nd transmission line to a transmission line of a master system.
6. The transmission line switching method according to claim 5,
in the transmission line switching step, when there is no request for transmission of a message in the communication terminal device group and a state where a current does not flow through the 1 st transmission line continues for a predetermined time or longer, it is determined that an abnormality occurs in the 1 st transmission line, and the 2 nd transmission line is switched to a transmission line of a master system on the condition that the 2 nd transmission line is normal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-005756 | 2017-01-17 | ||
| JP2017005756A JP6760855B2 (en) | 2017-01-17 | 2017-01-17 | Transmission line switching device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108337113A CN108337113A (en) | 2018-07-27 |
| CN108337113B true CN108337113B (en) | 2020-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810031778.7A Active CN108337113B (en) | 2017-01-17 | 2018-01-12 | Transmission line switching device and method |
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| JP (1) | JP6760855B2 (en) |
| KR (1) | KR102082849B1 (en) |
| CN (1) | CN108337113B (en) |
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| JP4451718B2 (en) * | 2004-06-04 | 2010-04-14 | 株式会社山武 | Power supply device and power supply method |
| CA2690050C (en) * | 2007-06-15 | 2014-07-29 | Stephen G. Seberger | Bidirectional dc to dc converter for power storage control in a power scavenging application |
| CN101350636B (en) * | 2008-09-04 | 2012-12-12 | 北京星网锐捷网络技术有限公司 | Method and system for link redundant backup base on photoelectric multiplexing port |
| CN101807986A (en) * | 2010-04-20 | 2010-08-18 | 杭州和利时自动化有限公司 | Realization method and device of redundant serial bus |
| CN102884807B (en) * | 2010-11-25 | 2015-02-25 | 三菱电机株式会社 | Communication line switching method, communication apparatus, station-side communication apparatus, communication system, and control device |
| CN104113476A (en) * | 2014-07-22 | 2014-10-22 | 深圳市邦彦信息技术有限公司 | Communication line switching method and system |
| KR101752454B1 (en) * | 2015-06-03 | 2017-07-03 | 코츠테크놀로지주식회사 | Data loss prevention system when automatic switching of fiber channel duplex communication channel and method thereof |
-
2017
- 2017-01-17 JP JP2017005756A patent/JP6760855B2/en active Active
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2018
- 2018-01-12 CN CN201810031778.7A patent/CN108337113B/en active Active
- 2018-01-16 KR KR1020180005489A patent/KR102082849B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018117209A (en) | 2018-07-26 |
| KR20180084666A (en) | 2018-07-25 |
| CN108337113A (en) | 2018-07-27 |
| JP6760855B2 (en) | 2020-09-23 |
| KR102082849B1 (en) | 2020-02-28 |
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