JPH07254869A - Line switching circuit - Google Patents

Abstract

PURPOSE:To provide the line switching circuit which obtains high reliability without newly requiring a large mounting space. CONSTITUTION:A switch board independent of a backboard 1 is provided as the main part for switching of connection states between current lines 2 as well as standby, lines 3 and current cables 4 as well as standby cables 5. Connectors 11, 12, and 13 incorporate switch circuits which can switch the connection states between current lines 2 as well as standby lines 3 and current cables 4 as well as standby cables 5 in the same manner as the switch circuit mounted on the switch board 6 after disconnecting the switch board 6 from current cables 4 and standby cables 5 in the case of the occurrence of a fault in the switch board 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a backboard on which a circuit board for realizing various functions is mounted, and a built-in circuit and a connected cable (line).
Relates to a line switching circuit for performing line switching in a communication device having a working / standby redundant configuration.

[0002]

2. Description of the Related Art This type of device is conventionally formed on a backboard 1 as shown in FIG. 12, and an active system line 2 continuing to an active system circuit is also formed on the backboard 1 and a standby system circuit. The switch mounted on the backboard 1 shows the connection state of the standby system line 3 continuing to the, the active system cable 4 (4a, 4b) forming the active system line, and the standby system cable 5 (5a, 5b) forming the standby system line. It is switched by the substrate 6.

The switch board 6 has four switches (S
W) 61, 62, 63, 64, which are connected to the backboard 1 by press-fit pins. The switch board 6 has a state in which the active system cable 4 is connected to the active system line 2 and a standby system cable 5 is connected to the standby system line 3, and a state in which the standby system cable 5 and the active system line 2 are connected to each other. Have a state.

Numerals 7 and 8 are connectors for connecting the active system cable 4 and the standby system cable 5 to the backboard 1. However, with the above configuration, since the active system line 2 and the standby system line 3 and the active system cable 4 and the standby system cable 5 are connected via only the switch substrate 6, the switch substrate 6 is not damaged. When it occurs, the signal is completely cut off between the active line 2 and the standby line 3 and the active cable 4 and the standby cable 5, and the reliability is low.

Therefore, as shown in FIG. 13, two switch substrates 6 (6a, 6b) are used, and these switch circuits 6 and 9 are used.
It is considered that the part is also used as a redundant structure to improve the reliability by selecting and using.

However, in this structure, since the two switch boards 6a and 6b must be mounted on the backboard 1, an extra mounting space is required and the backboard 1 becomes large. On the contrary, when the size of the backboard 1 is limited, it may be difficult to realize.

Further, as shown in FIG. 14, the ammunition connector 1
It is considered that the switch substrate 6 is connected via 0 (10a, 10b, 10c, 10d). The ammunition connector 10 is in the state shown in FIG. 15A when the switch board 6 is connected, and the switch board 6 is connected to the backboard 1. However, when the switch board 6 is removed from the backboard 1,
5 (b), the active system line 2 and the standby system line 3 are directly connected to the active system cable 4 and the standby system cable 5.

Therefore, when the switch board 6 has a failure, if the switch board 6 is removed from the backboard 1, the active line 2 and the standby line 3 are directly connected to the active cable 4 and the standby cable 5. It is possible to prevent the signal disconnection state from continuing.

However, when the working system line 2 and the backup system line 3 are directly connected to the working system cable 4 and the backup system cable 5 by the ammunition connector 10, the working system line 2 is used.
The connection state between the standby system line 3 and the active system cable 4 and the standby system cable 5 is fixed, and the connection state cannot be switched. Therefore, switching cannot be performed when a failure occurs, and a signal disconnection occurs.

[0010]

As described above, the prior art is as follows.
Despite working / standby redundancy configuration, working / standby
There is a problem in that the reliability of the switch substrate for performing the preliminary switching is problematic, and the effect of the redundant configuration cannot be sufficiently obtained.

For this reason, if a plurality of switch boards are provided in a redundant configuration, a problem arises in that a large mounting space for the switch board must be secured, and conversely, it is difficult to implement the switch board in a finite space.

If an ammunition connector is used as a further approach, the reliability of the switch board can be improved even though the structure is simple, but the switch board failure and the active system failure occur simultaneously. However, there was a problem that it was not possible to deal with such a case and it was not possible to obtain sufficient reliability.

The present invention has been made in consideration of such circumstances, and an object of the present invention is to perform line switching capable of obtaining high reliability without newly requiring a large mounting space. To provide a circuit.

[0014]

In order to achieve the above object, the first invention is a working system line and a standby system line provided on a backboard of a communication device, and a working system connected to the backboard. A switch board mounted with a first switch circuit for arbitrarily connecting a cable and a spare cable is mounted on the backboard separately from the backboard, and the working cable and the spare cable are connected to the backboard. A connector for connecting to a board separates the first switch circuit from the working system cable and the spare system cable, and optionally the working system line, the spare system line, the working system cable, and the spare system cable. A second switch circuit for connection is provided.

A second aspect of the present invention is the first aspect of the present invention, wherein the active line and the standby line provided on the backboard of the communication device and the active cable and the standby cable connected to the backboard are arbitrarily connected. A switch board mounted with a switch circuit, which is separate from the backboard, is attached to the backboard, and the first switch circuit is separated from the working cable and the standby cable on the backboard, and A second switch circuit for arbitrarily connecting the working system line, the backup system line, the working system cable and the backup system cable was provided.

A third aspect of the present invention is to connect the active line and the standby line provided on the backboard of the communication device with the active cable and the standby cable connected to the backboard. A switch board mounted with a switch circuit, which is separate from the backboard, is mounted on the backboard, and the first switch circuit is separated from the working cable and the spare cable, and the working line, the A spare system line, a second switch circuit for arbitrarily connecting the working cable and the spare cable, and a first switch board, the working line, the spare line, the working cable and the spare cable Monitor the existence of at least one of these faults, and if there is a fault, that fault will occur What is provided and switching control means, such as the second switch for controlling the circuit, for example the control circuit to disconnect from the other on the backboard.

[0017]

By taking these measures, the working system line and the protection system line and the working system cable and the protection system cable connected to the backboard are different from the backboard mounted on the switch board. A working line and a spare line, and a working cable and a spare connected to the backboard, which are arbitrarily connected by the first switch circuit of the body, or by a second switch circuit provided on the connector or the backboard. A system cable is directly and arbitrarily connected to the backboard without the first switch circuit.

According to the third invention, the switching of the second switch means is performed by at least one of the first switch board, the working line, the backup line, the working cable and the backup cable. It is automatically performed based on the presence / absence of any one failure.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 and 2 are views showing the configuration of the main part of a communication device to which a line switching circuit according to a first embodiment of the present invention is applied. FIG. FIG. 2 is a circuit diagram showing an electrical configuration. The same parts as those in FIG. 12 are designated by the same reference numerals.

In the figure, 1 is a backboard (motherboard)
The active system line 2 and the standby system line 3 respectively connected to the active system circuit and the standby system circuit mounted on the substrate (package or card) (not shown) mounted on the backboard 1 and the connector 11 , 12,
A pattern 14 that functions as a connection line that electrically connects 13 is formed.

The connector 11 is connected to the working cable 4 (4
a, 4b) for connecting to the backboard 1 and detachable from the backboard 1. Further, the connector 11 includes four switches 11a, 11b, 1
It incorporates 1c and 11d. This switch 11a, 1
1b, 11c, 11d are interlocked and switched by the operation knob 11e manually operated.

The connector 12 is connected to the spare cable 5 (5
a, 5b) is connected to the backboard 1 and is attachable to and detachable from the backboard 1. Further, the connector 12 has two switches 12a and 12b built therein. The switches 12a and 12b are interlocked and switched by an operation knob 12c that is manually operated.

The connector 13 is attachable to and detachable from the backboard 1. Further, the connector 13 has two switches 13a and 13b built therein. This switch 13a,
13b is interlocked and switched by the operation knob 13c manually operated.

A switch substrate 6 is connected to the backboard 1 by press fit pins (not shown). This switch board 6 has four switches (SW) 6
1, 62, 63, 64, and a first switch circuit for switching the connection state between the active system line 2 and the standby system line 3 and the active system cable 4 and the standby system cable 5 is mounted.

Now, the switches 11a, 11b, 11c, 11d, 1 built in the connectors 11, 12, 13 are provided.
2a, 12b, 13a, 13b are connected as shown in FIG. 2, respectively, and by cooperation of these respective switches, the switch board 6 is separated from the active cable 4 and the standby cable 5, and the active line 2 and the backup system line 3 constitute a second switch circuit for switching the connection state between the working cable 4 and the backup system cable 5.

Next, the operation relating to line switching of the communication device configured as described above will be described. First, normally, the operation knob of each connector 11, 12, 13 is set to the "OFF" side. Then, the switches 11a, 11b, 11
All of c, 11d, 12a, 12b, 13a, and 13b select the OFF side terminal as shown in FIG. Therefore, in this state, both the active system cable 4 and the standby system cable 5 are connected to the switch board 6, and the active system line 2 and the standby system line 3 and the active system line 3 in the first switch circuit mounted on the switch board 6 are connected. Cable 4
And the connection state with the spare system cable 5 is determined.

By the way, the first mounted on the switch substrate 6
The switch circuit has two states: a state in which the active system line 2 and the active system cable 4 and a standby system line 3 and the standby system cable 5 are respectively connected, and a state in which the standby system cable 5 and the active system line 2 are connected. Have. That is, the switch 61 selects the signal supplied from the switch 11a, the switch 64 selects the signal arriving via the backup system line 3, and the switch 62 selects the signal to the switch 11b.
When the switch 63 outputs signals to the standby system line 3 respectively, the effective signal path is as shown by the solid line in FIG. 3 (invalid signal line is the broken line), and the active system line 2 and the active system cable are shown. 4 and the spare system line 3 and the spare system cable 5 are connected to each other. Further, in a state where the switch 61 selects the signal supplied from the switch 63, the switch 64 selects the signal supplied from the switch 62, and the switch 62 outputs the signal to the switch 64 and the switch 63 to the switch 61, respectively. ,
The effective signal path is as shown by the solid line in FIG. 4 (the ineffective signal line is the broken line), and the active system line 2 and the standby system cable 5 are connected.

Now, when the operation knob 11e of the connector 11 is switched to the "ON" side (the operation knobs 12c and 13c of the connectors 12 and 13 remain the same), the switch 11
Each of a, 11b, 11c and 11d is switched to select the ON side terminal as shown in FIG. As a result, the active cable 4 and the standby cable 5 are separated from the switch board 6, and the active cable 4 is switched to the switch 11
a, 11b and switches 13a, 13b, respectively, to the active system line 2, and the backup system cable 5 is connected to the standby system line 3, via switches 12a, 12b and switches 11c, 11d, respectively. Thus, the effective signal path is as shown by the solid line in FIG. 5 (the ineffective signal line is the broken line), and the active system line 2 and the active system cable 4 and the standby system line 3 and the standby system cable 5 respectively connect the switch board 6. Connected without intervention.

Further, from this state, the connectors 12, 13 are
When the operation knobs 12c, 13c of the respective switches are switched to the "ON" side, the switches 12a, 12b, 13a, 1
3b is switched so as to select the ON-side terminal as shown in FIG. As a result, the active system cable 4 is disconnected from both the active system line 2 and the standby system line 3, and the active system line 2 and the standby system cable 5 are connected via the switches 12a and 12b and the switches 13a and 13b. . Thus, the effective signal path is as shown by the solid line in FIG. 6 (invalid signal line is the broken line), and the active line 2
And the backup system cable 5 are connected without the switch board 6.

As described above, according to this embodiment, the connector 1
By switching the operation knob 11e of No. 1 to the “ON” side and switching the switches 11a, 11b, 11c, and 11d to the ON-side terminal side, respectively, the active system line 2 and the standby system line 3 are connected without the switch substrate 6. The working cable 4 and the backup cable 5 can be connected. Therefore, when a failure occurs in the switch board 6, it is possible to prevent disconnection of the signal by switching the operation knob 11e of the connector 11 to the "ON" side. Moreover, in this embodiment, even when the switch board 6 is not used, the working line 2 and the working cable 4 are used.
It is possible to take two states: a state in which the standby system line 3 and the standby system cable 5 are connected, and a state in which the standby system cable 5 and the active system line 2 are connected. It is possible to prevent the signal from being disconnected even when a failure occurs in the active system cable 4 side in a state where the switch board 6 fails.

Further, in the present embodiment, the above-mentioned functions are implemented by the switches 11a, 11b built in the connectors 11, 12, 13,
Since it is realized by 11c, 11d, 12a, 12b, 13a, and 13b, there is no need for a new mounting space as in the case of preparing another switch substrate 6 and taking a redundant configuration, and the backboard It can be realized in a finite space without increasing the size of 1.

(Second Embodiment) FIG. 7 and FIG. 8 are diagrams showing a main configuration of a communication device to which a line switching circuit according to a second embodiment of the present invention is applied, and FIG. Perspective view,
FIG. 8 is a circuit diagram showing an electrical configuration. The same parts as those in FIGS. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

The difference between this embodiment and the first embodiment is that a connector 21 for connecting the active cable 4 to the backboard 1 and a connector 22 for connecting the active cable 5 to the backboard 1 are provided. Is an ordinary connector without a built-in switch, and the switches 11a, 11b, 11c, 11d and the operating knob 1
Switch section 23 having 1e, switches 12a, 12b
Also, the switch section 24 having the operation knob 12c and the switch section 25 having the switches 13a and 13b and the operation knob 13c are mounted on the backboard 1. Other configurations and operations are the same as those in the first embodiment.

Thus, according to this embodiment, the same effect as that of the first embodiment can be obtained. Further, in the present embodiment, since the connectors 21 and 22 do not have a built-in switch, the size of the connectors 21 and 22 is limited, and it is effective when it is difficult to build a switch. Further, connectors 21 and 22 having a general structure can be used.

(Third Embodiment) FIGS. 9 and 10 are diagrams showing the configuration of the main part of a communication apparatus to which the line switching circuit according to the third embodiment of the present invention is applied, and FIG. 9 shows the appearance. FIG. 10 is a perspective view, and FIG. 10 is a circuit diagram showing an electrical configuration. In addition,
The same parts as those in FIGS. 1, 2, 7 and 8 are designated by the same reference numerals, and detailed description thereof will be omitted.

Here, the difference between this embodiment and the second embodiment is that instead of the switch units 23, 24, 25, a relay group capable of performing a switching operation equivalent to these switch units 23, 24, 25. The relay group 3 is provided based on an alarm signal provided from an alarm control unit (not shown) via an alarm signal cable 35 connected to the backboard 1 by the connector 34 while providing 31, 32, 33.
The point is that a control circuit 36 for controlling 1, 32 and 33 is provided.

The relay group 31 includes switches 11a, 11
relays 31a corresponding to b, 11c and 11d,
It consists of 31b, 31c and 31d. The relay group 32 includes relays 32 corresponding to the switches 12a and 12b, respectively.
a, 32b. Further, the relay group 33 includes the switch 1
Relays 33a and 33b corresponding to 3a and 13b, respectively
Consists of.

FIG. 11 is a diagram showing a schematic configuration of the control circuit 36. As shown in this figure, the control circuit 36 outputs the switch board failure Fail signal of the alarm signals to the inverter 4
The relay drive circuit 42 drives each relay of the relay group 31 based on the signal whose logic is inverted by 1. The relay drive circuit 44 drives each relay of the relay group 32 based on the result of the NAND gate 43 taking the NAND logic of the switch substrate failure Fail signal and the active system failure signal of the alarm signals. Further, the relay drive circuit 46 drives each relay of the relay group 33 based on the signal obtained by inverting the logic of the active system failure signal of the alarm signals by the inverter 45.

Next, the operation relating to line switching of the communication device configured as described above will be described. First, in the present embodiment, the connection state between the active system line 2 and the standby system line 3 and the active system cable 4 and the standby system cable 5 is as described above.
Although similar to the case of the embodiment, in this embodiment, the connection state is automatically switched under the control of the control circuit 36 as follows.

That is, the switch board failure Fail signal is a signal that is at the "L" level when the switch board 6 is normal, and changes to the "H" level when a failure occurs. The active system failure signal is a signal that is at the “L” level when the active system cable 4 side is normal, and changes to the “H” level in response to the occurrence of a failure. Therefore, the relay drive circuit 42 is provided with the “L” level signal only when a failure occurs in the switch substrate 6, and thus the relay drive circuit 42 is provided with the “L” level signal in this way. Then, each relay of the relay group 31 is turned on.

Further, the relay drive circuit 44 is provided with the "L" level signal only when both the switch board 6 and the active system cable 4 side have a failure. The respective relays of the relay group 32 are turned on in response to the level signal being given.

Further, since the "L" level signal is given to the relay drive circuit 46 only when a failure occurs on the working cable 4 side, the relay drive circuit 46 receives the "L" level signal in this way. Each relay of the relay group 33 is turned on in response to the application.

Thus, according to this embodiment, the same effect as that of the first and second embodiments can be obtained. Moreover, according to the present embodiment, when a failure occurs in the switch board 6, the switch board 6 is automatically disconnected from the active cable 4 and the standby cable 5, and the active line 2 and the standby line 3 and the active system 5 are disconnected. The cable 4 and the spare system cable 5 are connected without the switch substrate 6 interposed therebetween, and signal disconnection is reliably prevented. Further, if a failure occurs on the working cable 4 side, the working line 2 and the backup cable 5 are automatically connected, and signal disconnection is reliably prevented.

The present invention is not limited to the above embodiments. For example, in each of the above embodiments, the working line 2
The connection configuration between the standby system line 3 and the active system cable 4 and the standby system cable 5 is as follows: the state in which the active system cable 4 and the active system line 2 are connected to the standby system cable 5 and the standby system line 3, and the standby system The cable 5 and the working system line 2 are connected to each other in two states. For example, the working system line 2, the working system cable 4, and the working system line 2
The connection state may be arbitrary such that the backup system cable 5, the backup system line 3 and the working system cable 4, and the backup system line 3 and the backup system cable 5 can be arbitrarily connected to each other. In addition, various modifications can be made without departing from the scope of the present invention.

[0045]

According to a first aspect of the present invention, a working system line and a backup system line provided on a backboard of a communication device and a working system cable and a backup system cable connected to the backboard are arbitrarily connected. A switch board mounted with one switch circuit, which is separate from the backboard, is mounted on the backboard, and a connector for connecting the active system cable and the standby system cable to the backboard is provided with the first A switch circuit is separated from the working system cable and the spare system cable, and a second switch circuit for arbitrarily connecting the working system line, the spare system line, the working system cable, and the spare system cable is provided.

A second aspect of the present invention is the first aspect for arbitrarily connecting the active system line and the standby system line provided on the backboard of the communication device with the active system cable and the standby system cable connected to the backboard. A switch board mounted with a switch circuit, which is separate from the backboard, is attached to the backboard, and the first switch circuit is separated from the working cable and the standby cable on the backboard, and A second switch circuit for arbitrarily connecting the working system line, the backup system line, the working system cable and the backup system cable was provided.

A third aspect of the present invention is the first aspect for arbitrarily connecting the active system line and the standby system line provided on the backboard of the communication device and the active system cable and the standby system cable connected to the backboard. A switch board mounted with a switch circuit, which is separate from the backboard, is mounted on the backboard, and the first switch circuit is separated from the working cable and the spare cable, and the working line, the A spare system line, a second switch circuit for arbitrarily connecting the working cable and the spare cable, and a first switch board, the working line, the spare line, the working cable and the spare cable Monitor the existence of at least one of these faults, and if there is a fault, that fault will occur What is provided and switching control means, such as the second switch for controlling the circuit, for example the control circuit to disconnect from the other on the backboard. With these, without requiring a new large implementation space,
The circuit switching circuit can obtain high reliability.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external appearance of a main part of a communication device to which a line switching circuit according to a first embodiment of the present invention is applied.

FIG. 2 is a circuit diagram showing an electrical configuration of a main part of a communication device to which the line switching circuit according to the first embodiment of the present invention is applied.

FIG. 3 is a diagram showing a first state of an effective signal path that can be taken by the communication device shown in FIGS. 1 and 2;

FIG. 4 is a diagram showing a second state of an effective signal path that can be taken in the communication device shown in FIGS. 1 and 2;

FIG. 5 is a diagram showing a third state of an effective signal path that can be taken by the communication device shown in FIGS. 1 and 2;

FIG. 6 is a diagram showing a fourth state of an effective signal path that can be taken by the communication device shown in FIGS. 1 and 2;

FIG. 7 is a perspective view showing an external appearance of a main part of a communication device to which a line switching circuit according to a second embodiment of the present invention is applied.

FIG. 8 is a circuit diagram showing an electrical configuration of a main part of a communication device to which a line switching circuit according to a second embodiment of the present invention is applied.

FIG. 9 is a perspective view showing an external appearance of a main part of a communication device to which a line switching circuit according to a second embodiment of the present invention is applied.

FIG. 10 is a circuit diagram showing an electrical configuration of a main part of a communication device to which a line switching circuit according to a second embodiment of the present invention is applied.

11 is a diagram showing a schematic configuration of a control circuit shown in FIGS. 9 and 10. FIG.

FIG. 12 is a diagram illustrating a conventional technique.

FIG. 13 is a diagram illustrating a conventional technique.

FIG. 14 is a diagram illustrating a conventional technique.

FIG. 15 is a diagram illustrating a conventional technique.

[Explanation of symbols]

1 ... Backboard 2 ... Current system line 3 ... Standby system line 4 (4a, 4b) ... Current system cable 5 (5a, 5b) ... Standby system cable 6 ... Switch board 11,12,13,21,22,34 ... Connector 11a-11d, 12a, 12b, 13a, 13b ... Switch 11e, 12c, 13c ... Operation knob 23, 24, 25 ... Switch part 31, 32, 33 ... Relay group 35 ... Alarm signal cable 36 ... Control circuit 31a ... 31d, 32a, 32b, 33a, 33b ... Relay

Claims (3)

[Claims] 1. A line switching circuit for switching a line in a communication device, wherein a board on which circuits for realizing various functions are mounted is mounted on a backboard, wherein a working line provided on the backboard. And a switch separate from the backboard mounted on the backboard, the first switch circuit for arbitrarily connecting the backup system line and the working cable and the backup system cable connected to the backboard. A board and a connector for connecting the working cable and the spare cable to the backboard, disconnecting the first switch circuit from the working cable and the spare cable, and the working line,
A line switching circuit comprising: the standby system line; the active system cable; and a second switch circuit that arbitrarily connects the standby system cable. 2. A line switching circuit for switching a line in a communication device, wherein a board on which circuits for realizing various functions are mounted is mounted on a backboard, wherein a working line provided on the backboard. And a switch separate from the backboard mounted on the backboard, the first switch circuit for arbitrarily connecting the backup system line and the working cable and the backup system cable connected to the backboard. A board and a backboard, which separates the first switch circuit from the working system cable and the spare system cable, and uses the working system line, the spare system line,
A line switching circuit comprising: a second switch circuit that arbitrarily connects the working cable and the backup cable. 3. A line switching circuit for switching a line in a communication device, wherein a board on which circuits for realizing various functions are mounted is mounted on a backboard, wherein a working line provided on the backboard. And a switch separate from the backboard mounted on the backboard, the first switch circuit for arbitrarily connecting the backup system line and the working cable and the backup system cable connected to the backboard. A board and a backboard, which separates the first switch circuit from the working system cable and the spare system cable, and uses the working system line, the spare system line,
A second switch circuit for arbitrarily connecting the working cable and the backup cable; and a first switch board provided on the backboard,
The presence / absence of at least one of the working system line, the protection system line, the working system cable, and the protection system cable is monitored. And a switching control means for controlling the second switch circuit so as to disconnect the circuit from the line switching circuit.