JPS581368A - Automatic telephone switching system - Google Patents

Abstract

PURPOSE:To freely receive telephone calls, transmitted through two circuits, by both telephone sets or to receive them by one telephone set while the other is busy, by providing a switch of a simple constitution. CONSTITUTION:When a telephone call is made on the 1st circuit 1, a switch A is reset by the control of the 1st ringer detecting circuit 1' and held in the reset state until the hook-on operation of the 1st telephone set 3 is performed. At this time, a switch B is reset and held in the state until the hook-on operation of the 2nd telephone set 4 is performed. For example, when a telephone call is made on the 2nd circuit 2 while the 1st telephone set 3 is engaged with the 1st circuit 1, the switch B is reset by the control signal of the 2nd ringer detecting circuit 2' to allow the 2nd telephone set 4 to answer to the telephone call from the 2nd circuit 2. When the telephone call for the 1st circuit 1 is received by the 2nd telephone set, the switch A is set, thereby answering to the call.

Description

[Detailed Description of the Invention] The present invention relates to an automatic telephone switching system, and in particular, when a call is received on one line out of two telephones for two lines, either telephone can receive the call, and in that state, the other telephone This invention relates to an automatic telephone switching system that allows a user to use another telephone when a call is received.

Conventionally, when a telephone is connected to two lines and one of the lines is in use, the other line must be switched manually, which is a cumbersome process. Also, when there are a large number of lines, there is a representative telephone system, but this is not suitable for those with two lines and is not common. If a call is made, the bells on both phones will ring, and you can receive the call from either phone. There was a demand for something that could automatically switch the connection status between the line and telephone so that users could make calls.

Therefore, it is an object of the present invention to provide an automatic telephone switching system suitable for such demands, and for this purpose, in the automatic telephone switching system according to the present invention, the first call
1: a first changeover switch means having a reset terminal connected to the second line and a set terminal connected to the second line; a set terminal connected to the first line; and a reset terminal connected to the second line; a second changeover switch means having a second changeover switch, a second changeover switch connected to the first changeover switch, and a second changeover telephone connected to the second changeover switch means.

a first ringer detection means for detecting a ringer state of the line III; and a second ringer detecting means for detecting a ringer state of the second line.
It has ringer detection means, and when a call is placed on the power of each line, it can be received by either of the above-mentioned telephones, and in that state, when the telephone on the other line picks up, the call can be made on the other telephone. It is characterized by being pressed so that it can be used.

Before describing the present invention in detail, one embodiment of the present invention will be briefly explained based on FIGS. 1 and 2. FIG.

Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 (a) is an explanatory diagram of the operation of the changeover switch part B (hereinafter referred to as the switch person), and Fig. 2 (b) is an illustration of the operation of the changeover switch part B (hereinafter referred to as the switch person). FIG. 2 is an explanatory diagram of the operation of the switch (referred to as switch B).

In FIG. 1, 1 is a first ringer detection circuit, 2 is a second ringer detection circuit, 3 is a first telephone, 4 is a second telephone, ■ is a first line, and ■ is a second line.

Now, when a call is received on the first line (■), the first ringer detection circuit 10 control signal causes the switch person to be in the reset state and the first
Phone 3 is on hook (here, the handset is picked up)
This state is maintained until it is turned on.

At this time, as shown in the 70-chart in FIG.
Telephone 4 remains in this state until hook 6 is turned on. And so, I got a call on the 1st -〇! At nine o'clock, the first
This allows the user to receive a call from either the telephone 3 or the second telephone 4.

Now, suppose that the first telephone 3 receives a call from the second line ■ while talking with this first line ■, and at 9 o'clock, the 29th line
As shown in the flowchart of FIG. 2, the control signal from the line detection circuit 2 causes the switch B to be reset, allowing the second telephone 4 to respond to calls from the second line (2).

On the other hand, when the second telephone 4 is answering a call on the first line and a call comes in on the second line (■), the switch person It can respond to this if it is not in the set state.

Next, switch A and B to realize this kind of thing.
The configuration will be explained based on FIGS. 3 and 4.

FIG. 3 shows the configuration of the switch person, and FIG. 4 is an explanatory diagram of its operation.

In FIG. 3, 5 is a clock oscillator, 6 is a first ringer signal terminal, 7 is a second ringer signal terminal, 8 is a hook signal terminal, 9.10 is an AND circuit, 11.12 is a NAND circuit, and 13 is a NAND circuit. OR circuit, 14 is a flip-flop.

Here, the first ringer signal terminal 6 is a terminal to which a control signal is transmitted, which is output when the first ringer detection circuit 1 detects a ringing signal when a telephone call arrives on the first line 3. be. The wE2 ringer signal terminal 7 is a terminal to which a control signal is transmitted, which is output when the second ringer detection circuit 2 detects a ringing signal when a telephone call arrives on the second line (2).

The hook signal terminal 8 is a terminal to which a hook signal is transmitted when the first telephone 3 picks up the handset and is in the hook-on state.

The flip-flop 14 outputs a switch set signal "1" from the output terminal Q when the set terminal 81CrOJ is applied.

Note that the configuration of the switch B is the same as that of the switch person, and includes a first ringer detection circuit 1 and a second ringer detection circuit 2.
The terminal part of the control signal transmitted from each is different,
The only difference is that the hook signal from the second telephone 4 is applied to the hook signal terminal 8, and that the switch Bt is set by the output of the prip-70 knob 14, so the state when used as switch B is ( ) is displayed.

Next, the operation shown in FIG. 3 will be explained based on FIG. #I4.

In FIG. 3, a clock oscillator 5 generates a clock OLK as shown in FIG. Now is the time for Happy 4th figure -
When a call is received on the second line ■, the @2 ringer detection circuit 2 outputs "1", which is transmitted to the second ringer signal terminal 7 in FIG. Therefore, at 1 o'clock [TI, the AND circuit 10 turns on and outputs 2RINO-, and the NAND circuit 12 outputs *8ETPrOJ. At this time W
Since the E1υ' ringer detection circuit 1 outputs IRINGrOJ, the OR circuit 13 outputs *81TrOJ and transmits it to the set terminal 8 of the slip flop 140.

This causes the slip prop 14 to become "1" from the Q terminal.
Thus, switch A becomes set m. Therefore, when a calling signal is applied to the second line (2), the call can be received even from the first telephone side 3.

Then, at time T, the first telephone 3 receives the call and sends out a hook signal *FOOK rOJ meeting.

When the call ends, the hook signal *FOOK rlJ is generated, but at this time, the AND circuit 9 is outputting IRINOrOJ, so the NAND circuit 11 continues to output "1", and the slip-flop 14 is not reset. Maintain set state.

Next, at time T4, a calling signal is transmitted to the first line ■, and the first ringer detection circuit 1 detects this and outputs "1".
I-ING "1" is output from the first ringer signal terminal 6. As a result, the AND circuit 9 turns on and IRINOr
Output lJ. This and the 4th hook signal terminal 8 to the first
Indicates that telephone 3 is off the hook *FOOK
Since rlJ is output, NAND circuit 11 is *R
5ETrOJ is output, and this "0" is input to the reset terminal RK of the 7rip@70 knob 14. Thus, at time TrI4VC, the flip-prop 14 outputs "0" from the Q terminal as a reset output, and the switch A is in the reset state. Thus, when a call arrives on the first line (2), the first telephone 3 becomes ready to receive the call.

This is done every time a call is received on the first line (2) and the second line (2), and as a result, the operations shown in the flowcharts of FIGS. 1112 (a) and (b) are repeated.

As explained above, according to the present invention, since the switches A and B are provided with extremely simple configurations, it is possible to freely receive a call that comes to each of the two lines on both telephones, or when one of the telephones is busy. This makes it possible to receive calls on the other phone, making it possible to provide very convenient calls.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 (a) is an explanatory diagram of the operation of the switch person, Fig. 2 (b) is an explanatory diagram of the operation of switch B, and Fig. 3 is an explanatory diagram of switch A (B). Configuration diagram. FIG. 4 is an explanatory diagram of the operation of each part. In the figure, ■ is the first line, ■ is the second line, 1 is the first ringer detection circuit, 2 is the second ringer detection circuit, 3 is the first telephone, 4
is a second telephone, 5 is a clock oscillator, 6 is a first ringer signal terminal, 7 is a second ringer signal terminal, 8 is a hook signal terminal, 9.10 is an AND circuit, 11.12 is a NAND circuit, 1
3 indicates an OR circuit, and 14 indicates a 7-rig frog. Patent applicant Fujitsu Ltd. Representative Patent Attorney Akira Yamatani

Claims (1)

[Claims] (1) Reset terminal connected to the first line and 12
a first switching switch means connected to the line and having nine set terminals; a set terminal connected to the first line; and a set terminal connected to the first line;
a second changeover switch having a reset terminal connected to the second line; a first telephone connected to the first changeover switch; a second telephone connected to the second changeover switch; a first ringer detection means for detecting a ringer state of the first line; and a second ringer detecting means for detecting a ringer state of the second line; In such a case, either of the above-mentioned telephones can receive the call, and when a call is received on the other line in that state, the call can be made on the other telephone.
This is an automatic telephone switching system that is characterized by: