JPS6212296A - Signal line switching device - Google Patents

Abstract

PURPOSE:To place a telephone circuit in a call ready state even in case of a power failure by using a switch part which requires electric power only in switching operation and connecting one of signal lines constituting a home bus to the telephone circuit when neither the home bus nor the telephone circuit is used. CONSTITUTION:Switches 6-8 are switches which require electric power only in switching operation and hold themselves in last states until they are put in switching operation. When there is no external call made and a specific signal is present on none of a subscriber line 1 and circuits 2-4, only a predetermined switch, e.g. 6 is turned on. When a signal switching device 5 is powered down while a telephone set 13 is connected to an external line, the switch 6 holds the current state, so it is still on and the call can be carried on. Then when the signal line switching device 5 is powered off when a telephone set is not used, only the predetermined switch 6 is one, so the circuit 2 is connected to the subscriber line 1 at any time and an external call can be made.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a second signal line similar to each of a set of first signal lines.
a plurality of switches for opening and closing between each of the signal lines;
The signal line switching device includes connection control means for selectively opening and closing the switch, and even in the event of a power outage, that is, when the power supply to the signal line switching device is stopped, at least one of the first signal lines is connected to the signal line switching device. One of the signal lines and one of the second signal lines are related to such a signal line switching device that allows them to be always connected.

[Background of the invention]

2. Description of the Related Art Home automation systems or home bus systems have been proposed from various fields, which interconnect and control electrical devices in the home. This system establishes a common transmission path (called a home bus) within the home, connects household electrical devices, etc. to this home bus, and controls them and exchanges data via the bus. It is. In addition, the so-called telecontrol function and telemonitor function connect such a home bus to a public network such as a telephone, and use the telephone from outside to control indoor electrical equipment and monitor the status. Various proposals have also been made regarding this.

One such system is the home information communication network (MAN: HomeArea) from the Electric Corporation.
An information network (Information Network) has been proposed. This is a home bus that has multiple signal lines dedicated to telephone calls and signal lines dedicated to control, and connects subscriber lines, etc. from outdoors via a network controller (also called a path controller, etc.). This network controller serves as a signal line switching device.

This network controller is described in detail in 1981 IEICE General Conference 816-2 ``Necessity and Functions of Home Information and Communication Network Controller.''

Now, one of the overlapping problems in such a network controller is power outage countermeasures.

Naturally, the home bus system described above uses an indoor commercial power source, so if a power outage or power outlet is disconnected, its function will stop and the L7 error will occur. Normal telephone lines have a power supply superimposed on the line so that calls can be made even during power outages, but in the home bus system described above, this home bus system 7ji operation If you don't do this, your phone will be disconnected.

Therefore, as stated in the above-mentioned document, a backup amplifier power supply is required for at least the network controller in order to operate the telephone line normally. However, this makes the entire system very expensive.

[Purpose of the invention]

An object of the present invention is to provide a line 8 switching device which is useful for solving the problems of the prior art described above, that is, it is possible to maintain at least the telephone IGL line so that calls can be made without requiring a bank-up power supply even in the event of a power outage. [Summary of the Invention] The main point of the present invention is to provide a signal line switching device that controls switching between a telephone line and a home bus. A switch that requires power only during switching operation,
When the home bus or telephone line is not used, at least one of the signal lines constituting the home bus and the telephone line must be connected.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on Examples. FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 1 is the telephone line to the home, 2, 3.4 is the telephone line in the home (home bus), 5 is the signal line switching device according to the present invention, and 6°7.8 is the main line. One of the important elements in invention
10.11.12 is a signal line that transmits the switching signal 6 for switching on and off of the switch 6.7.8, respectively; 9 is a switching control circuit that controls switching of the switch; 15.14. 15 is connected to the home telephone line '1! 8 aircraft.

First, switch 6.7.8 will be explained.

This switch is a switch that requires power only during switching operation, and maintains the previous state until switching operation is performed.

Therefore, if the power supply to the signal line switching device 5 becomes hot while the switch is on due to a power outage or unplugging of the power outlet, the switch will remain on and the power supply will disappear when the switch is off. In this case, the switch maintains the off state. Note that such a switch includes, for example, a keep relay.

The operation shown in FIG. 1 will be explained. Figure 1 shows one subscriber line 1.
On the other hand, six lines 2,5.4 are provided in the house, and these are selectively switched by a signal group switching device 5 including switches 6, 7, and 8. First, when a call is received from outside, the switching control circuit 9 detects this signal, monitors the status of lines 2 and 5, and sends a switching signal to the switch corresponding to the free line. This means turning on only that switch.

For example, when a telephone call comes in from outside and the line 2 is idle, the switching control circuit 9 detects this, turns on the switching signal line 10, turns on the switch 6, and turns on the telephone 13. This allows you to communicate with the outside world.

Next, when making a call from inside the house to the outside, for example, when making a call to the outside using telephone 13, line 2
When the switching control circuit 9 detects the above signal and the other lines 3 and 4 are not connected to the subscriber line 1, the switching signal line 10 is turned on, the switch 6 is turned on, and the line 2 and the subscriber line are connected. Connect line 1. Further, in the case where there is no call to the outside and there is no predetermined signal on subscriber line 1 or line 1m2, 5.4, according to the invention, only predetermined switches are turned on. That is, switches 6.7.
One of the eight options is always left on.

Now, as described above, in the present invention, the operation when receiving a call or making a call is almost the same as in the conventional technology, but due to power outage or disconnection of the power outlet, etc., the signal line The operation when the power supply to the switching device 5 is lost is different.

First, as shown in FIG. 1, if the power supply to the signal line switching device 5 is cut off while the switch 6 is on and the telephone 13 is talking to an external device, the switch 6 retains its current state. You can stay off and continue talking.

Next, there is a case where the power supply to the signal line switching device 5 is cut off when the telephone is not in use, but in this case, only a predetermined switch is turned on. Therefore, for example, if this switch is set to 6, line 2 is always connected to subscriber line 1 even when there is no power supplied to signal line switching device 5, and only telephone 15 is connected to the outside even in this state. Can make phone calls.

FIG. 2 shows the switching control circuit 9 in FIG. 1 in more detail. In FIG. 2, the same parts as in FIG. 1 are given the same reference numerals. 16 is a signal detection circuit for subscriber line 1, 17, 18°, 19 is for lines 2, 5, .
4 signal detection circuit.

20 is a four-man powered NOR gate circuit, 21 is a two-man powered OR gate circuit, and 22 is a switching signal generation circuit. The signal detection circuit 16 outputs a signal when a predetermined signal is present on the subscriber line 1. Signal detection circuits 17 and 18.19 detect rHJ when there are predetermined signals on lines 2 and 5.4, respectively.
Output a signal. Switches 6, 7, and 8 are, for example, keep relays, and have a set terminal S for inputting a signal to turn on the switch, and a reset terminal R for inputting a signal for turning off the switch, each of which is operated by the rHJ signal. do. 10a is an on control signal line that supplies an on signal to the set terminal of switch 6, and 10b is an on control signal line that supplies an on signal to the set terminal of switch 6.
This is an off control signal line that supplies an off signal to the reset terminal of.

In such a configuration, when the telephone is not communicating with the outside, there is no predetermined signal on the subscriber line 1 and the line 2.3.4, so the signal detection circuit 16.17.18.1
All output signals of 9 are rLJ signals. Therefore, NO
The output of the R gate circuit 20 becomes rHJ, and an on signal is supplied to the switch 6 via the OR gate circuit 21 and the on control signal line 610a, and the switch 6 is turned on. When a call is received from outside or when making a call to outside, the signal detection circuit 16.17.18゜1
9 detects the signal, and the switching signal generating circuit 22 generates a switching control signal for the corresponding switch to turn on only that switch.

FIG. 3 shows another embodiment of the invention. In the same figure,
The same parts as in FIG. 2 have the same reference numerals, and 501 is a control signal dedicated line in the house, 502 is a control signal processing circuit that processes control signals on the control signal dedicated line, and 503 is a control signal processing circuit 5.
If at least one of the three lines 2, 3.4 is used in the output signal line of 02, rHJ occurs. 504 is 2 person power NO
This is an R gate circuit.

In this embodiment, a dedicated control signal line 501 is provided in addition to the five lines 2, 5° 4 in the house, and when a certain device uses the line, it first uses this dedicated control signal line 501. After determining which line to use among the three lines, the switch 6°7.8 is turned.

To explain using FIG. 6, for example, when a certain device makes a call to the outside, first, a control signal is sent to the exclusive line 501.
Sends a signal to inquire about line usage status. The control signal processing circuit 502 processes the signal and responds with the vacant line number from the switch status etc. by the switching signal generating circuit 22 through the control signal exclusive line 501, and also transmits the corresponding line number through the switching signal generating circuit 22. Turn on the switch.

In this way, in the example shown in FIG. 3, in order to perform switch control through the control signal dedicated line 501, the control signal processing circuit 5
02 and the switching signal generation circuit 22, it is possible to grasp the usage status of the line.

Therefore, in this example, the line usage status is monitored by these circuits, and if no line is in use, the output signal line of the control signal processing circuit 502 is set to rLJ, and subscriber line 1 is not used. If not, its output signal is r
Since it will be LJ.

These are detected by the NOR gate 504, and the ON control signal 10a is set as rFIJ via the OR gate 21, and a predetermined switch, for example, the switch 6
is turned on.

In addition, as in the example of FIG. 3, when line control is performed using a control signal dedicated line, the control signal processing circuit 5 that processes it
The switching control circuit 9 including 02 often uses an arithmetic processing device.

FIG. 4 is an example of an application in which the signal line switching device shown in FIG. 3 is used. In the figure, 23 is a telephone subscriber line to the house, 24, 25, 26 is a telephone line in the house, 27 is a dedicated control signal line, 28, 33, and 38 are signal line switching devices,
29.50. ri1 and 34. ! 15.56 and 39°4
0.41 is a switch that requires power only during switching operation, and 32 and 37 are switching control circuits according to the present invention.

42 is a conventional switching control circuit, 45 and 44 are telephone lines, and 45 and 46 are telephones.

In the example shown in Figure 4, there are telephone lines 24, 25, 26 in the house.
In addition, there is a dedicated control signal line 27, and the switching control circuit 32 uses the signals of this dedicated control signal line 27 and the subscriber line 23 to switch the switches 29, 30, . ! +1 control. Similarly, the switching control circuit 37 controls the switches 34, 35, 36 by signals from the control signal exclusive line 27 and the telephone line 43, and the switching control circuit 42 controls the control signal exclusive line 27 and the telephone line 43.
The switch 39°40.41 is controlled by the signal No.4.

The switching control circuits 32 and 37 according to the present invention switch one predetermined switch (for example, , switches 29 and 54)
Be sure to turn on only. On the other hand, the signal line switching circuit 58 turns on only one of the switches 39, 40, and 41 only when the telephone 46 makes a call.
When the power supply to B is cut off, the state at that time is maintained.

In such a configuration, a case will be explained in which the power supply to the signal line switching devices 28, 33, and 38 is cut off due to a power outage, power outlet group, or the like. First, telephone 45
Alternatively, if the power supply is cut off while the f'i 46 is talking to an outsider, the call can be continued. Further, if the power supply is cut off while there is no communication with the outside, only the switches 29 and 34 are in the on state, so that only the telephone 45 can communicate with the outside.

Now, in the above explanation, the signal line switching device that switches between one subscriber line and three telephone lines has been described, but the present invention can also be applied to the case where N signal lines and M signal lines are switched. . 1 FIG. 5 shows an embodiment in which two subscriber lines and three telephone lines are switched.

In the same figure, 47 and 48 are subscribers @, 49, 50, and 5
1 is the home phone line, 53.54.55.56.57
．． 58 is a switch that requires electric power only when operating switch 7;

59 is a switching control circuit according to the present invention, 60.61.62
゜65 and 44.65 are the corresponding switches on.

The switching control circuit 59, which is a control signal line that controls turning off, detects predetermined signals on the subscriber line 47.48 and the telephone line 49.50.51, and turns on the corresponding switch. Also, subscriber line 47.48 and telephone line 19.50.
In the absence of a predetermined signal on 51, at least one predetermined switch, e.g.
Alternatively, only the switch 56 or both switches 53 and 56 are left in the on state.1,,l [Effects of the Invention] According to the present invention, the simple configuration eliminates the power supply to the signal line switching device. At least 1
A set of signal lines can be connected, making a backup power source unnecessary.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing one embodiment of the present invention, FIG. 2 is a circuit diagram showing a specific example of the main parts of a signal line switching device according to the present invention, and FIG. FIG. 4 is a circuit diagram showing an example of application of the present invention, and FIG. 5 is a conceptual circuit diagram showing another embodiment of the present invention. 5...Signal line switching device &6.7.8...Switch 9
...Switching control circuit 16. '17.18.19...
・Signal detection circuit 2Q...NOR gate circuit 21・
・・OR gate circuit 22 ・・Switching signal generation circuit 3rd
Concave figure 5

Claims (1)

[Scope of Claims] 1) A plurality of switches each opening and closing between each of M first signal lines and each of N second signal lines; In a signal line switching device consisting of a connection control means that selectively opens and closes (
(M and N are natural numbers), the switch is a switch that requires power only during opening/closing operations, and the connection control means controls the plurality of switches regardless of whether power is supplied to the signal line switching device. At least one of the signal lines is always kept in a closed state, and one of the first signal lines and one of the second signal lines are maintained in a connected state. Signal line switching device. 2) In the signal line switching device according to claim 1, the connection control means includes a first signal detection circuit that detects predetermined signals on the first and second signal lines; The output of the first signal detection circuit causes the first
and a second signal detection circuit that detects that part or all of the second signal line is not used for transmitting a predetermined signal, and the detection output from the second signal detection circuit is If there is a signal line, at least one set of the first signal line and one of the second signal lines determined in advance are brought into a connected state. The signal line switching device according to item 1.