JPH06209351A - Line switching device of high reliability - Google Patents

Abstract

PURPOSE:To provide a line switching device of high reliability which switches a standby communication controller which can be normally operated in the case of a fault of a communication controller. CONSTITUTION:This system consists of plural current communication controllers CCT1 to CCLn, one standby communication controller CCL0, and a line switching device 3 which switches all lines of the faulty current communication controller to the standby communication controller CCL0 at the time of the occurrence of the fault in current communication controllers CCL1 to CCLn, and the line switching device 3 is provided with a means which can select a communication controller for a standby machine from current communication controllers CCL1 to CCLn and the standby communication controller CCL0.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to switching control between a communication line and a communication control device for controlling the communication line, and more particularly to a high-performance switching control device for switching between an operating communication control device and a backup communication control device. The present invention relates to a reliability line switching device.

[0002]

2. Description of the Related Art Generally, a communication control device has a high importance in an online system. Therefore, in order to minimize the effect of the communication control unit going down, when a failure occurs in the operating communication control unit, the communication control unit with the failure is switched to the backup communication control unit. A device for ensuring high reliability of line control is known.

Conventionally, an apparatus of this type is disclosed in, for example, JP-A-60-136452. FIG. 12 is a block diagram of a conventional line switching device. 12
, CCL0 to CCLn are communication control devices, 3 are line switching devices, RL1 to RLn are line switching relay groups, and D
CE11 to DCEnm are modems or subscriber line termination devices (DSU (Digital Service Uni).
t)).

In FIG. 12, the communication line is formed by grouping m lines into one line group, and collecting n line groups. Each of the communication lines of the n line groups has a communication control unit CCL0 to CCL.
controlled by n. The communication line and the communication control devices CCL0 to CCLn are connected by the line switching device 3 and the subscriber line termination device or the modems DCE11 to DCEnm.

Here, the communication control devices CCL0 to CCLn
Is a device for controlling the communication line, and is the communication control devices CCL1 to CCLn of the operating machine used for normal operation, and the communication control devices CCL1 to CCL of the operating machine when the operating machine is in an abnormal state.
Communication control device CC of a standby machine that performs control instead of CLn
And L0. Further, the line switching device 3 has line switching relay groups RL1 to RLn therein, and performs switching between the communication control devices CCL1 to CCLn of the operating device and the communication control device CCL0 of the standby device. The line switching relay groups RL1 to RLn are respectively connected to a B contact point connected to the communication control devices CCL1 to CCLn of the operating machine, an M contact point connected to the communication control device CCL0 of the standby machine, and a communication line side. It consists of a C contact, and the C contact is connected to either the B contact or the M contact. Normally, the C contact is connected to the B contact when the line switching relay groups RL1 to RLn are not operating, and the C contact is connected to the B contact when the line switching relay groups RL1 to RLn is operating. It

Switching of the contacts of the line switching relay groups RL1 to RLn is performed by pressing down a switching button on an operation panel (not shown) on the line switching device 3 or inputting a command from a host processor (not shown). Done by Also, a subscriber line termination device or a modem D
CE11 to DCEnm are for communication connection corresponding to each communication line.

Next, the function and operation of the conventional line switching device will be described with reference to FIG. First, a case where the communication control devices CCL1 to CCLn of the operating machine are operated in a normal state will be described. In this case, in the line switching device 3, the m lines of the communication control device CCL1 are connected to the B contact side of the line switching relay group RL1 corresponding to each line. When operating in a normal state, the line switching relay group RL1 is not in an operating state, and therefore the B contact of the line switching relay group RL1 is connected to the C contact. C of the line switching relay group RL1
The contacts are connected to the communication line via the corresponding modems DCE11 to DCE1m. As a result, the communication control device CCL1 of the operating machine is connected to the communication line.

The same applies to communication control devices CCL2 to CCLn other than the communication control device CCL1. During normal operation, all lines of the communication control devices CCL1 to CCLn of all operating machines are connected to the communication lines. . On the other hand, the communication control device CCL0 of the standby device is in a standby state without being connected to anything. This is the line switching relay group RL
This is because in any of 1 to RLn, the M contact connected to the communication control device CCL0 of the standby machine is not connected to the C contact on the communication line side.

Here, as an example of the operation of switching between the communication control device of the operating machine and the communication control device of the standby machine, the switching operation when the communication control device CCL2 of the operating machine becomes abnormal will be described. When an abnormality occurs in the communication control device CCL2 of the operating machine, first, the switching button of the communication control device CCL2 of the operation panel (not shown) is pressed on the line switching device 3. Then, in the line switching device 3, all the contacts of the line switching relay group RL2 corresponding to the communication control device CCL2 are switched. By switching this contact,
The contact C of the line switching relay group RL2 is switched from the contact B to the contact M.

At this time, the line switching relay group RL2
The communication control device CCL2 is connected to the contact B of the contact C
A communication control device CCL0 of the standby machine is connected to the.
Therefore, as a result, the communication control unit CCL0 of the standby machine is connected to the contact C of the line switching relay group RL2 instead of the faulty communication control unit CCL2, and the alternate operation state is set.

Next, the communication control device C in which the failure has occurred
When CL2 recovers from the failure, the communication control device CCL0 of the standby machine is changed to the communication control device CC by the following process.
Switching to L2 is performed. When the communication control device CCL2 recovers from the failure, the operator switches from the communication control device CCL0 of the standby machine to the communication control device CCL2 by pressing the switch button on the operation panel again or inputting a command from the host processor (not shown). Will be returned.

The line switching relay groups RL1 to RLn
Control is performed by operating an operation panel (not shown) on the line switching device 3 so that two or more do not operate at the same time. In the configuration of FIG. 12, the communication control device CC of which operating machine
Even if a failure occurs in L1 to CCLn, it is possible to continue the line control operation by immediately switching to the communication control device of the standby device according to the instruction of the operator.

[0013]

However, in the above-mentioned conventional line switching device, it is not possible to know the failure of the communication control device of the standby device in advance, and it is not possible to obtain a highly reliable line switching device. There is a point. Hereinafter, the problem will be described.

In the above-mentioned conventional line switching device, the same communication control device is always on standby as the communication control device of the standby machine and switches to the communication control device of the standby machine only when the operating machine fails. In this case, the standby device communication control device is not connected to the communication line, and therefore it is not possible to determine whether the standby device communication control device is in the normal state or in the failed state until it is connected to the communication line. It That is, in the standby state, it is not possible to determine the state of the function of the communication control device of the standby machine.

Therefore, in the conventional line switching device, when the communication control device of the operating machine fails and is switched to the communication control device of the standby device, the communication control device of the standby device may be inoperable. This is because if the communication control device of the standby device is left unused for a long time as a standby state, it may cause a failure due to battery exhaustion or an oxide film may be generated on the relay contact of the line switching device. Therefore, the communication control device of the switched standby device may not be usable, and a reliable switching device may not be obtained.

The present invention solves the above-mentioned problems of the conventional line switching device, and can switch the communication control device of the standby machine which can normally operate even when the communication control device has a failure, and is highly reliable. An object is to provide a line switching device.

[0017]

To achieve the above object, a highly reliable line switching device of the present invention comprises a plurality of operational communication control devices, one spare communication control device, and operational communication. When a failure occurs in the control device, it consists of a line switching device that switches all lines of the faulty communication control device to the backup communication control device, and the line switching device is one of the operation communication control device and the backup communication control device. It has a means for selecting the communication control device of the standby machine from.

Further, the high reliability line switching device of the present invention is
Consists of a plurality of communication control units and a line switching unit that switches all the lines of the faulty communication control unit from the communication control units to unused standby communication control units when a failure occurs in the communication control unit However, the line switching device may have means for selecting the standby communication control device from the communication control devices.

[0019]

According to the present invention, the communication control device of the operating machine and the communication control device of the standby machine can be selected from the plurality of communication control devices by the line switching device, and the selection can be performed according to a predetermined schedule. Therefore, by performing the operations in order, the communication control device of the standby device can be brought into the operating state periodically without being fixed.

By this regular operation, it is possible to detect in advance a defect in the communication control device of the standby machine. In addition, regular use can reduce contact failure due to generation of an oxide film on the relay contacts that form the line switching device.

[0021]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a block diagram of a highly reliable line switching device of the present invention, and the highly reliable line switching device of the present invention will be described with reference to this block diagram. In FIG. 1, CCL0 to CCLn are communication control devices, 1 is a standby device control unit, 3 is a line switching device, 5 is a standby device selecting unit, 7 is a line switching unit, RL1S to RLnS are standby device replacement relay groups, RLD is a spare machine disconnection relay group, RL1 to RLn
Is a line switching relay group, and DCE11 to DCEnm are modems or subscriber line terminators. In FIG. 1, a communication line is formed by grouping m lines into one line group, and the line group is formed by n groups.

Each of the communication lines of the n group of lines is controlled by the communication control devices CCL0 to CCLn. In the following, when simply indicating a communication control device, it is referred to as a communication control device CCL. The communication line and the communication control devices CCL0 to CCLn are the line switching device and the subscriber line termination device or the modems DCE11 to DCEn.
connected by m.

Here, the communication control devices CCL0 to CCLn
Is between the host and remote stores in multiple remote locations and controls the communication line to control the collection and delivery of electronic messages.The operation machine used for normal operation and the operation machine when the operation machine is in an abnormal state It consists of a standby machine that controls the machine instead of the machine. Here, the communication control devices CCL1 to CCLn are operating machines, and the communication control device CCL0 is a standby machine.

Further, the line switching device 3 includes a standby device control unit 1
It is composed of a standby unit selection unit 5 and a line switching unit 7. The standby machine control unit 1 controls the relay group in the standby machine selection unit 5, and the standby machine selection unit 5 selects an operating machine and a standby machine from the communication control devices CCL1 to CCLn and the communication control device CCL0. In addition, the line switching unit 7 connects the communication control device CCL of the operation machine selected by the standby device selection unit 5 and the communication line.

First, the spare unit selecting section 5 will be described. The spare machine selecting unit 5 includes a spare machine replacement relay group RL1S.
~ RLnS and a spare machine disconnection relay group RLD. The spare machine replacement relay groups RL1S to RLnS are
The communication control device CCL of the operation machine and the communication control device CCL of the standby machine are input, and the outputs are connected to the line switching relay groups RL1 to RLn of the line switching unit 7.

Further, the details will be described with reference to the block diagram of the spare machine replacement relay shown in FIG. This spare machine replacement relay RLS (hereinafter, simply referred to as a spare machine replacement relay RLS when representing a spare machine replacement relay) is configured by connecting two relay groups, and the two pairs of relays are connected. The group has N and X as input terminals and is connected to the contact points CN and CX, respectively, and has Y and U as output terminals, which are respectively connected to the contact point MN and the contact points BN and MX. There is.

The input terminal N is connected to the communication control unit CCL of the operating machine, and the input terminal X is connected to the communication control unit CCL of the standby machine. In FIG. 1, in the normal state, the contact CN and the contact BN are also the contact CX and the contact B.
Since X is connected, the communication control device CCL of the operating machine
Is connected to the output terminal U. On the other hand, the backup communication control device CCL has no connection destination, and the output terminal Y is not connected anywhere.

In this state, the spare machine replacement relay R
When a standby machine replacement instruction is input to the LS from the standby machine control unit 1, the two relay groups operate simultaneously. This connection state is shown in the connection state diagram of the spare machine replacement relay in FIG. In FIG. 3, when the spare machine is not replaced, the input terminal N
And the output terminal U are connected, while when the spare machine is replaced, the input terminal N and the output terminal Y and the input terminal X and the output terminal U are connected.

Here, the spare machine replacement relay group RL1S-
The communication control device CC is provided at each input terminal N of the RLnS.
L1 to CCLn are connected, and a spare machine replacement relay group RL
A communication control device CCL0 of the standby machine is connected to each input terminal X of 1S to RLnS. Further, the output terminals Y of the spare machine replacement relay groups RL1S to RLnS are connected to the make contact side of the line switching relay groups RL1 to RLn and the output terminal of the communication control device CCL0 of the spare machine for replacement of the spare machine. The line switching relay groups RL1 to RL are connected to the output terminals U of the relay groups RL1S to RLnS, respectively.
The break contact side of n is connected.

The standby machine disconnection relay group RLD switches whether the communication control unit CCL0 of the standby machine is in a standby state or in an operating state. As described above, the input terminal is used to control communication of the standby machine. The device CCL0 is connected, and the output terminal Y of the spare machine replacement relay groups RL1S to RLnS and the make contact side of the line switching relay groups RL1 to RLn are connected to the output terminals.

Next, the line switching unit 7 will be described. The line switching unit 7 has line switching relay groups RL1 to RLn, and by this, the communication control devices CCL1 to CC of the operating machine
Switching between Ln and the communication control device CCL0 of the standby machine is performed. Each of the line switching relay groups RL1 to RLn includes a break contact (hereinafter, referred to as a B contact) connected to the communication control devices CCL1 to CCLn of the operation machine, and a make contact (hereinafter, referred to as a contact B of the backup machine). ,
M contact) and a common contact (hereinafter referred to as C contact) connected to the communication line side, and the C contact is connected to either the B contact or the M contact.

Normally, when the line switching relay group RL (hereinafter, simply referred to as the line switching relay group RL) is not in operation, the C contact is connected to the B contact. When the line switching relay group RL is in the operating state, the C contact is connected to the B contact. The switching of the contacts of the line switching relay group RL is performed by pressing down a switching button on an operation panel (not shown) on the line switching device 3 or by inputting a command from a host processor (not shown).

Also, a subscriber line terminating device or a modem DC
E11 to DCEnm are for communication connection corresponding to each communication line. Next, the operation of the highly reliable line switching device of the present invention will be described. (A) Normal operation state: FIG. 1 shows an initial state of the highly reliable line switching device of the present invention, in which the standby machine replacement relay groups RL1S to RLnS and the standby machine disconnection relay groups of the standby machine selection unit 5 are shown. The RLDs are connected as shown in FIG. 1. In the spare machine replacement relay group RL1S, the input terminal N is connected to the output terminal U, and the line switching relay group RL is connected.
In, the B contact and the C contact are connected.

FIG. 4 is a flow chart of signals in a normal state of the high reliability line switching apparatus of the present invention. In FIG. 4, a thick solid line indicates a connection state between the communication control device CCL and the communication line. By the connection, as shown in FIG. 4, the communication line and the communication control devices CCL1 to CCLn are connected to the line switching device 3 and the subscriber line terminating device or the modems DCE11 to DCEnm.
All lines are connected via the
The signal line that should go to the communication line 0 is not connected by the line switching unit 7 and is in a standby state. As a result, the communication control device CCL0 becomes the communication control device of the standby machine.

The line switching relay groups RL1 to RLn
Are controlled from an operation panel (not shown) of the line switching device 3 so that two or more of them do not operate at the same time. (B) Switching operation: Next, the switching operation will be described with reference to FIG. (A) Here, when the communication control device CCL0 is used as a standby device, the communication control device CCL * (hereinafter, the representative of the communication control devices CCL1 to CCLn is referred to as the communication control device CCL *) is abnormal due to a failure or the like. The switching operation in the case of becoming is explained.

FIG. 5 is a flow chart of the switching operation of the high reliability line switching device of the present invention. First, it is determined whether an abnormality has occurred in the communication control device CCL * (step S1). In step S1, the communication control device CCL
If * is in an abnormal state, the switch button of the communication control device CCL * on the operation panel (not shown) on the line switching device 3 is pressed. If the communication control device CCL * is in a normal state, the process returns to step S1 again (step S2).

When the switching button of the communication control device CCL * is pressed, the line switching relay group RL * (hereinafter referred to as the representative of the line switching relay groups RL1 to RL1n) in the line switching device 3 corresponding to the communication control device CCL *. Line switching relay group R
L *) all the contacts are switched, and the contact C of the line switching relay group RL * is connected to the contact M in step S.
3).

As a result, the line switching relay group RL *
The communication control unit CCL * connected to the contact point B of the line in the abnormal state is disconnected, and instead, the line switching relay group R
Communication control device C of the standby machine connected to the contact M of L *
CL0 is connected to the contact C of the line switching relay group RL *, and an alternative operation state is set by the communication control device CCL0 of the standby machine (step S4).

When the faulty communication control unit CCL * is recovered from the fault and the abnormal state is resolved, it is judged whether the communication control unit CCL * is restored (step S5), and the operator again selects the line switching unit 3 By pressing the switching button of the communication control device CCL * on the operation panel (not shown) (step S6), the communication control device CC
The communication control device CCL * is switched from L0 (step S7).

As a result, the communication control unit CCL * can be put into operation again (step S8). The switching operation of the high-reliability line switching device is controlled by the communication control device CCL.
FIG. 6 shows the case where 2 is in an abnormal state. FIG. 6 is a block diagram of a highly reliable line switching device when switched to a standby device, and thick solid lines are communication control devices CCL1 and CCL.
3 to CCLn and the communication line are shown, and the thick broken line shows the connection between the communication control device CCL0 of the standby machine and the communication line.

The connection between the communication control unit CCL0 of the standby machine and the communication line is performed via the standby machine disconnecting relay group RLD and the line switching relay group RL2. In addition, the communication control device CCL2 in the abnormal state has the standby device replacement relay group RL2.
It is separated from the communication line by S. (B) Next, when the communication control device CCL2 is used as a backup communication control device, the switching operation when the communication control device CCL1 becomes abnormal will be described.

FIG. 7 is a flow chart of signals in the normal state of the high reliability line switching apparatus of the present invention. In FIG. 7, a thick solid line indicates a connection state between the communication control device CCL and the communication line,
The thick broken line indicates the connection state between the communication control device CCL2 of the standby machine and the communication line. When the communication control device CCL2 is used as a standby unit, the line switching relay group RL2S and the standby unit disconnection relay group RLD of the standby unit selection unit 5 are connected to the side opposite to that shown in FIG. 1 by energizing the coil. To be done. In addition, other spare machine replacement relay groups RL1S, RL3
All of S to RLnS are connected in the same manner as shown in FIG.

As a result, as shown in FIG. 7, the communication line and the communication control unit CCL0 are connected to the spare machine replacement relay group RL.
2S, line switching relay group RL2, and modem DCE21
~ 2m, and also the communication control device CCL1,
CCL3 to CCLn are also spare device replacement relay groups RL1S,
RL3S to RLnS, line switching relay group RL1, RL
3 to RLn and modems DCE11 to 1m, 31 to nm, and the signal line to go to the communication control unit CCL2 is not connected by the line switching unit 7 and stands by.
As a result, the communication control device CCL2 becomes a standby device.

The line switching relay groups RL1 to RLn
Are controlled from an operation panel (not shown) of the line switching device 3 so that two or more of them do not operate at the same time. In this state, for example, a case where the communication control device CCL1 is in an abnormal state will be described. Here, a case where the communication control device CCL1 is in an abnormal state will be described.

When the communication control device CCL1 is in an abnormal state, the connection with the contact C of the line switching relay group RL1 is switched from the contact B to the contact M. As a result, the connection between the communication control device CCL1 and the communication line is cut off, and the communication control device CCL2, which is the communication control device of the standby machine, is disconnected.
Is connected to the communication line. Here, the switching operation when the CCL1 becomes abnormal will be described. Communication control device C
When an abnormality occurs in CL1, the switching button of the communication control device CCL1 on the operation panel (not shown) on the line switching device 3 is pressed.

By pressing this switching button, all the contacts of the line switching relay group RL1 in the line switching device 3 corresponding to the communication control device CCL1 are switched, and the contact C of the line switching relay group RL1 is the line switching relay. It is connected to the contact M of the group RL1. By switching the contacts in the line switching relay group RL1, the line switching relay group RL1
Communication controller CC in an abnormal state connected to the contact B of the
L1 is disconnected, instead the line switching relay group RL1
The communication control device CCL2, which is a standby machine and is connected to the contact point M, is connected to the contact point C of the line switching relay group RL1 and enters the alternative operation state.

After that, when the communication control unit CCL1 which is in an abnormal state due to a failure is recovered from the failure, the operator again switches the communication control unit CCL1 on the operation panel (not shown) on the line switching unit 3 by the operator. By pressing, the communication control device CCL2 of the standby machine is switched to the communication control device CCL1. In this way, the spare machine control unit 1 and the spare machine replacement relay groups RL1S to RLnS and the spare machine disconnection relay group RL of the spare machine selection unit 5 are used.
Energize the coil of D. By this energization, each relay is driven and the contact is switched.

Therefore, it is possible to operate an arbitrary communication control device CCL as a communication control device of the standby machine by driving the standby machine replacement relay groups RL1S to RLnS and the standby machine disconnection relay group RLD of the standby machine selection unit 5. is there.
Next, another switching operation of the highly reliable line switching device of the present invention will be described. Another switching operation of the high-reliability line switching device of the present invention is to select a communication control device as a standby device from among a plurality of communication control devices by rotation.

This communication control device is selected by adding a function of selecting a spare device to the line switching device 3. Then, by rotating the communication control device as the standby device according to a predetermined schedule, it is possible to know a failure such as a failure of the standby device in advance before an abnormality occurs in the communication control device CCL, and switch to the standby device. It is possible to prevent obstacles in case of contact.

Hereinafter, description will be given with reference to the rotation diagrams of the spare unit in the high reliability line switching apparatus of the present invention shown in FIGS. Note that here, the communication control device CCL
1 to communication control unit CCLn and communication control unit CCL0
For example, a case where the rotation is performed as a standby machine in the order of is described. FIG. 8 shows a case where the communication control device CCL1 is a standby device and the other communication control devices CCL2 to CCLn and the communication control device CCL0 are operating devices.

In this case, the spare machine replacement relay group RL
The input terminal N and the output terminal Y of 1S are connected, the input terminal X and the output terminal U are connected, and the standby machine disconnection relay group RLD is disconnected. As a result, the communication control device CCL1 becomes a standby device, and the communication control devices CCL2 to CCLn and the communication control device CCL0 become operating devices.

Next, by rotation, the communication control unit CCL2 is used as the standby unit, and the communication control unit CCL1 that was the standby unit up to that point is used as the operating unit. In FIG. 9, the communication control device CCL2 serves as a standby machine, and other communication control devices CCL
1, CCL3 to CCLn and the communication control device CCL0 are shown as operating machines.

In this case, the spare machine replacement relay group RL
By switching the contact of 1S, the connection of the input terminal N is changed from the output terminal Y to the output terminal U, and the connection of the input terminal X is connected from the output terminal U. As a result, the communication control device CCL1
Is an operational machine. On the other hand, spare machine replacement relay group RL2S
The input terminal N and the output terminal Y are connected, and the input terminal X and the output terminal U are connected. As a result, the communication control device CCL2 becomes a standby device.

The spare machine disconnection relay group RLD is separated. In addition, other communication control devices CCL3 to C
CLn and the communication control device CCL0 are used as they are operating machines. FIG. 10 shows a state in which the communication control device CCLn is a standby device by repeating the rotation.

In this case, the spare machine replacement relay group RL
The input terminal N and the output terminal Y of the nS are connected to each other, and the input terminal X and the output terminal U are connected to each other, whereby the communication control device CCL2 becomes a communication control device of the standby machine.
The standby machine disconnection relay RLD is disconnected.
The other communication control devices CCL1 to CCLn-1 and the communication control device CCL0 are used as operating machines.

In FIG. 11, the communication control device CCL0 serves as a standby machine, and the other communication control devices CCL1 to CCL are used.
The case where n is the operating machine is shown. In this case, by switching the contacts of the spare machine replacement relay group RLnS,
The input terminal N is connected from the output terminal Y to the output terminal U, and the input terminal X is connected from the output terminal U. As a result, the communication control device CCLn becomes an operating machine.

On the other hand, the standby machine disconnecting relay RLD is switched to be in the disconnecting state. With this connection
The communication control devices CCL1 to CCLn are operating devices, and the communication control device CCL0 is a standby device. Next, a second embodiment of the highly reliable line switching device of the present invention will be described. FIG. 13 is a block diagram of a second embodiment of the high reliability line switching device of the present invention.

In FIG. 13, reference numeral 15 is a spare device selecting device,
Reference numeral 17 is a line switching device, CCL0 to CCLn are communication control devices, and DCE11 to DCEnm are modems or subscriber line termination devices. In the second embodiment shown in FIG. 13, the backup machine selection circuit 5 in the first embodiment of the present invention is used as a backup machine selection device 15 as an additional device.

By using the function of selecting the spare device as an additional device, even if the existing line switching device 17 that does not have the function of selecting the spare device is added with the spare device selecting device 15, a high performance can be achieved. It becomes possible to achieve reliability. Next, a third embodiment of the highly reliable line switching device of the present invention will be described. FIG. 14 is a block diagram of a latching relay for a third embodiment of the high reliability line switching device of the present invention.

In FIG. 14, C is a common contact, B is a break contact, and M is a make contact. In the third embodiment of the present invention, the relay and line switching unit 7 of the standby unit selecting unit 5 is used.
It uses a latching relay instead of the relay. Normally, a relay energizes a coil to switch contacts, and the energization must be maintained in order to maintain a connection with a make contact.

As shown in FIG. 14, when the contact C is connected to the contact B, it is connected without energizing the coil, but when the contact C is connected to the contact M on the opposite side of FIG. The coil must be energized. If the coil is energized for a long time, power consumption increases. However, when a latching relay is used instead of this normal relay, switching of contacts is possible only by inputting a pulse, and does not require a current for maintaining the connected state.

That is, when the contact point C and the contact point M on the opposite side of FIG. 14 are connected, it is switched by once inputting a pulse to the coil, and when returning to the original state, it is only necessary to input the pulse once to the coil. Therefore, it is possible to reduce power consumption by using the latching relay. Further, as long as a new failure such as a power failure does not occur, the operation can be continued with the connection state as it is.

Next, a fourth embodiment of the highly reliable line switching device of the present invention will be described. The fourth embodiment of the high reliability line switching device of the present invention uses a logic circuit instead of the relay in the embodiment of the present invention. That is,
A relay circuit having a function similar to that of the relay is configured by a logic circuit, and is replaced in place of the relay.

As a result, the element can be formed into an LSI, and the device can be downsized and the power consumption can be reduced. Next, a fifth embodiment of the highly reliable line switching device of the present invention will be described. FIG. 15 is a block diagram of a fifth embodiment of the highly reliable line switching device of the present invention.

In FIG. 15, 1 is a standby control unit, 3 is a line switching device, 5 is a standby selection unit, 7 is a line switching unit, and 9 is a line switching unit.
Is a bus, CCL1 to CCLp are communication control devices, and S1 to S
p is a switch for selecting a standby device, AS1 to ASp are switches for switching lines, and DCE11 to DCEqm are modems or subscriber line termination devices. Here, the communication control device CCL1
~ Number of CCLp and spare selection switch S1 to Sp
Let p be the number of communication lines, and q be the number of communication lines.

That is, the communication control devices CCL1 to CCLp
Is greater than the number of communication lines, and the communication control devices CCL corresponding to the number of communication lines are used as standby communication control devices. In the above-described embodiment of the high reliability line switching device of the present invention, the number of standby devices is one,
In this fifth embodiment, a plurality of spare machines can be used.

In FIG. 15, the line switching device 3 is composed of a standby device selection unit 5 and a line switching unit 7, and connects the communication control device CCL to the communication line. The line switching device 3 is composed of p spare device selecting switches S1 to Sp,
Each of them is connected to the communication control devices CCL1 to CCLp and is also connected to the standby machine control unit 1. The standby machine control unit 1 outputs a standby machine selection signal to the standby machine selection switches S1 to Sp to output a plurality of communication control devices CCL1 to CCL.
From among p, the communication control device of the operating machine and the communication control device of the standby machine are selected.

The spare unit selecting section 5 is composed of line switching switches AS1 to ASp, whose input terminals are connected to the spare unit selecting switches S1 to Sp, and their output terminals are connected to q buses 9. It is also connected to the standby control unit 1. Here, the bus 9 is a modem DCE11-D
It is connected to a communication line (not shown) via CEqm.

The standby control unit 1 is a line switching switch AS.
A bus selection signal is output to 1 to ASp to select a bus to be connected from the q buses 9. By selecting the bus 9, the communication line to be connected can be selected. The standby unit selection signal and the bus selection signal are determined by the number of communication lines, and any one of the p communication control units CLL can be selected as an operating unit, and the remaining communication control units CLL can be used as standby units. Communication control device.

Further, by changing the standby unit selection signal according to a predetermined schedule, it is possible to rotate the communication control device as the standby unit. As a result, similar to the above-described embodiment of the present invention, it is possible to know in advance a failure such as a failure of the standby machine before an abnormality occurs in the communication control device, and prevent a failure when switching to the standby machine. it can.

The present invention is not limited to the above embodiments, but various modifications can be made based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

[0072]

As described above in detail, according to the present invention, although the standby device is fixed in the conventional line switching device, in the high reliability line switching device of the present invention, the standby device is By having the function of selecting a machine, any communication control device can be used as a standby machine.

Further, by providing an automatic operation mechanism for automatically selecting a spare machine, the spare machine can be rotated according to a predetermined schedule such as daily or weekly. It is possible to realize a highly reliable line switching device capable of knowing the failure.

[Brief description of drawings]

FIG. 1 is a block diagram of a highly reliable line switching device of the present invention.

FIG. 2 is a configuration diagram of a spare device replacement relay.

FIG. 3 is a connection state diagram of a spare machine replacement relay of the present invention.

FIG. 4 is a signal flow chart in a normal state of the high reliability line switching apparatus of the present invention.

FIG. 5 is a flowchart of a switching operation of the high reliability line switching device of the present invention.

FIG. 6 is a block diagram of the high reliability line switching device of the present invention when switched to a standby device.

FIG. 7 is a flow chart of signals in a normal state of the high reliability line switching device of the present invention.

FIG. 8 is a rotation diagram of a standby device in the high reliability line switching device of the present invention.

FIG. 9 is a rotation diagram of a standby device in the high reliability line switching device of the present invention.

FIG. 10 is a rotation diagram of a standby device in the high reliability line switching device of the present invention.

FIG. 11 is a rotation diagram of a standby device in the high reliability line switching device of the present invention.

FIG. 12 is a block diagram of a conventional line switching device.

FIG. 13 is a block diagram of a second embodiment of the high reliability line switching device of the present invention.

FIG. 14 is a configuration diagram of a latching relay for a third embodiment of the highly reliable line switching device of the present invention.

FIG. 15 is a block diagram of a fifth embodiment of the highly reliable line switching device of the present invention.

[Explanation of symbols]

1 standby device control unit 3 line switching device 5 standby device selection unit 7 line switching unit 9 bus 15 standby device selection device 17 line switching device CCL0 to CCLn, CCLp communication control device RL1S to RLnS standby device replacement relay group RLD standby device disconnection Relay group RL1 to RLn Line switching relay group DCE11 to DCEnm, DCEqm Modem or subscriber line termination device

Claims (3)

[Claims] 1. (a) a plurality of operational communication control devices;
(B) one backup communication control device; and (c) a line switching device that switches all the lines of the faulty communication control device to the backup communication control device when a failure occurs in the operational communication control device. (D) The high-reliability line characterized in that the line switching device has means for selecting a standby communication control device from the operational communication control device and the standby communication control device. Switching device. 2. The high-reliability line switching device according to claim 1, wherein the line switching device comprises a latching relay. 3. A standby system in which (a) a plurality of communication control devices and (b) when a failure occurs in the communication control device, all lines of the communication control device are not used from the communication control device. (C) the line switching device has means for selecting the communication control device of the standby device from among the communication control devices. Reliable line switching device.