JPH0260350A - Hook detecting circuit - Google Patents

Abstract

PURPOSE:To decrease cost by providing an individual hookup detecting circuit to detect the hookup condition of respective telephone sets when a telephone set is separated from a trunk line with the hookup detecting output of a master hook detecting circuit. CONSTITUTION:A master hook detecting circuit 11 is provided at trunk line L1 and L2 sides of contacts r1-r2 relays Ry1-Ry3. The circuit 11 detects either of telephone sets D1-D3 are hooked up. Simultaneously, at a cross point switch 2 side of the contacts r1-r2 of the relays Ry1-Ry3, an individual hook DP detecting circuit 12 to detect individually the hookup condition of respective telephone sets D and it is individually detected which telephone set D is hooked up. Thus, for an individual hookup detecting circuit, it is not necessary to use the parts with high pressure resistance, the low cost can be obtained, only one circuit 11 with a high cost is sufficient and a total cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field 1) The present invention relates to a hook used in a telephone switching device to which a plurality of telephones are connected and which has a simple switching function for switching between a central office line call and an extension call. This relates to a detection circuit.

[Prior Art 1] Fig. 4 shows this type of telephone exchange equipment. The telephone exchange main body A is connected to a station #it+, 11L2, a telephone outlet B, and a door phone C.A telephone W11) is connected to the telephone exchange A via the telephone outlet B, and each telephone is connected to the telephone exchange A. In addition to being able to make line calls and doorbell calls, you can also hold calls during central office lines, hold transfers, and make extension calls.

Please note that the phone is not a dedicated one, but a commercially available phone.
D, and the above-mentioned extension calls and hold operations are performed by dialing the telephone.

FIG. 5 shows the configuration of the telephone outlet B, and FIG. 6 shows the configuration of the telephone exchange main body A. The telephone outlet [3 is connected to the telephone exchange main body A through two call lines Q and two control lines @C of the telephone exchange main body A, and allows calls #i0.
is a telephone outlet) T3's mono □ Rough center MO is connected to terminal a, and control #IC is connected to speaker SP.
and a light emitting diode (L1-). In other words, by connecting the modular jack of the telephone set to the monoplane outlet MC, the telephone set is connected to the telephone exchange main body A via the communication line Q, and at the same time, the telephone set is connected to the telephone exchange main body A from the control mO. An audio signal is sent to the speaker SP of the telephone outlet H, and a display signal is sent to the light emitting element CD.

The audio signal emitted from the speaker of the above-mentioned telephone outlet (B) is a notification tone in the case of a doorbell call, an extension call, or the like. In addition, in the case of an incoming call from a central office line, a ring tone is sounded from the bell provided in the telephone 1) in the same way as a normal telephone 8!1). The display signal sent to the telephone outlet B is a DC voltage signal, and a voice signal such as a notification sound sent to the speaker SP is sent superimposed on the display signal. The display signal and the audio signal are sent to the telephone socket (H) by the notification sound display control circuit 7 of the main body A of the telephone exchange apparatus. Then, the voltage of the display signal is detected by the voltage detecting circuit 10 of the telephone, and one of the light emitting diodes L D + and L l) 2 is turned on. In this telephone exchange, the light emitting diodes L, D, CI)2 indicate whether the central office line is in use or #11 is in use.

In the main body of the telephone exchange apparatus of this embodiment, - As mentioned above, a command dial may be input to place a call on hold during a call on the central office line, so this command dial is input to the central office line [, l I 1. -To avoid being sent to the 2nd side,
When using the telephone while talking on a central office line, dial the station +l + il, ■, 2 directly.
Instead, it is connected only in an alternating current manner via the transformer 'I' and the cross point switch 2. For this reason, the DC connection circuit 3 performs DC connection to the central office lines 1, 1, and 2 during a telephone call, and the communication current supplying circuit 4 supplies the monthly telephone current to cover the telephone bill 1). Note that the cross-point switch 2 is a matrix switch, and one axis is assigned to each telephone D, and the other axis is assigned a central telephone line, an extension telephone line, and a doorbell telephone line, and the telephone line for each telephone fiD is set. . Further, the incoming call from station #i is detected by the incoming call detection circuit 5 detecting a ringing tone.

When relays RV+ to RV3 are turned on, the telephone fi+) is connected to contact r.
~ Connect to cross point switch 2 by r3: ( together with, connect telephone 8!D to central office line 1-, , L when off.
Since the relays R5'+ to RY3 are normally on, they are turned off only when the incoming call detection circuit 5 detects an incoming call on the central office line, and the ringing tone from the office causes each telephone to ring the bell.

The 7 link l') I) (dial pulse) detection circuit 6 according to the present invention detects the 77 state of the telephone 1) and the dial pulse from the telephone 1) from the current flowing through the telephone fi l'). It is.

The other components include a door phone call circuit 3 and a CPU 1, and the door phone call circuit 8 is an interface circuit between the phone fiD and the door phone C during a door phone call, and the CPU 1 is a circuit for each of the above-mentioned circuits. It controls the operation.

When a telephone exchange main body A receives an incoming call on the central office line, an incoming call detection circuit 5 detects the incoming call. When this station line incoming detection output is manually inputted, CPU UL turns off relay RY+~) y3, and then outputs the station line 1-,
, L.

2, connect all telephones fiD and make the ringer sound. Then, when the handset of any of the telephones fiD is hooked up, the 7-2-DP detection circuit 6 detects the hook-up. By the output of this hook D I) detection circuit 6, CPLI 11f'J Ray Ry, -Ryswot
Turn it on. At this time, the DC connection circuit 3 is simultaneously operated to maintain the connection state with the station. Next, the cross-point switch 2 connects the central office line and the telephone line Q2 of the 7-upped telephone to enable central office telephone communication with that telephone.

By the way, the hook/DP detection circuit 6 of the above-mentioned telephone exchange equipment detects that the telephone line α is directly connected to the central office line I.

Since it is connected to [,2], it is necessary to insulate it, and since the current direction cannot be specified, a bidirectional 7 Otocoupler ID C is used. 1. , , ! , , , requires a high voltage resistance. In this conventional telephone exchange of 8%, hook/DP detection circuits 6 such as those shown in FIGS.

[Problem to be Solved by the Invention 1] The present invention has been made in view of the above-mentioned points, and its purpose is to provide a low-cost hook detection circuit.

1 Means for Solving the Problems 1 In order to achieve the above object, the present invention provides a master hook detection circuit that detects the hook-up state of a telephone when receiving a call from a central office line, and a hook-up detection output of a master 7 ivy detection circuit. The telephone has an individual hookup detection circuit that detects the hookup state of each telephone when the telephone is disconnected from the central office line.

(Function) As described above, the present invention detects the hookup state of each telephone in a state where the individual hookup detection circuit is disconnected from the central office line, thereby hooking up the telephone in a state where the central office line and the telephone are connected. It is possible to reduce the cost of individual hook-up detection circuits by eliminating the need for insulation or the use of high-voltage components as in the case of detecting the state, and to reduce the cost of the high-cost master hook-up detection circuit. It is designed to reduce the 1-tal cost so that only one is required.

(Example) An embodiment of the present invention is shown in FIGS. 1 to 3.

In this embodiment, the conventional hook l) l) detection circuit 6
Relay R
Contact points r of V+ -RY3, -r, station lines 1-, . 1
．． 2 side, this master hook detection circuit 11 connects any telephone 8! It detects that D1 to I)3 are 7.2 pulled up, and connects each telephone fi to the cross point switch 2 side of contacts r and ~r3 of relays Ry and ~toy.
A N117γ-DP detection circuit 12 is provided to individually detect the 77 quadruple state of D, and to individually detect which telephone 1fiD has been hooked up. Note that the other configurations are the same as those described in the conventional example.

Now, when the incoming call detection circuit 5 detects the incoming call fi as shown in Fig. 2(,), 1) Rays Ry+ to Ry3 are turned off as shown in Fig. 2(1) to (d), and all phone f
A ringtone sounds from the iD. When any telephone is hooked up, the master hook detection circuit 11 changes to the state shown in FIG. 2(c).
Detected in According to the output of the master hook detection circuit 11, the relays Ry+ to Ry3 are turned on, and the calls #io, of all telephones fiD are connected to the cross point switch 2, and at the same time, the DC connection circuit 3 is connected to the The closed state with the station is maintained as shown in k). As mentioned above, contacts r1 to r3 of relays RY+ to Ry3
is switched to the cross point switch 2 side,
Phone 1) in the hooked-up state receives call #10. Since a voltage is applied to the individual hooks, the transistor Q of the detection circuit 12 is turned on. For this reason, it is important to know which phone 8!1) was answered by CI) U 1
can be determined, and as shown in FIG. 2(i), the cross point switch 2 connects the second telephone 1)'s call mo7 to the central office lines I4, 1, and 2. Therefore, after that, you will not be able to make calls to the central office. Then, when the call ends and the phone fiD is downloaded 7 times, the individual hook/I)P detection circuit 12 detects the 7 calls of the phone fiD, and the CP 111 detects the a point as shown in 2 & I (i). One switch 2 makes that phone 8! The communication line Q of 1) is disconnected from the central office communication line, and the DC connection circuit 3 is connected to the
As shown in k), turn off to release the central line call enabled state. FIG. 3 shows a 70-chart illustrating the above-described operation.

In this way, the individual hook/DP detection circuit 12 always
．． ,, Since it is not connected to L2, there is no need to insulate it with 7 Otocups 2 as in the conventional example. Furthermore, the current flowing through the communication line Q5 while the relay Ry is on is supplied by the communication current supply circuit 4, and its polarity is constant, so one individual hook/DP detection circuit 12 is required as described above. It can be constructed from transistors Q. Although the number of parts in this embodiment is increased by 7 bidirectional couplers of the master hook detection circuit 11 compared to the conventional example, since the individual hook/DP detection circuit 12 can be configured with small signal transistors, it is different from the conventional example. There is no need to use a plurality of expensive bidirectional 7-coupler with high withstand voltage that can be connected to and disconnected from the office lines I, l l I-, -+, and the total cost can be significantly reduced compared to the conventional example.

[Effects of the Invention] As described above, the present invention includes a master hook detection circuit that detects the 7-link up state of the telephone when receiving a call from the central office line, and a hook-up detection output of the master hook detecting circuit that detects when the telephone is disconnected from the central office line. Since the system is equipped with an individual hook amplifier detection circuit for detecting the hook-up state of each telephone, the individual hook detection circuit can detect the seven hook-up states of each telephone while being disconnected from the return line.
Therefore, there is no need to provide insulation or use components with high withstand voltage, which is required when detecting a 7-trick amplifier state when the central office line and telephone are connected, and the cost of the individual hookup detection circuit can be reduced. Moreover, since only one master hook detection circuit is required, which is expensive, the total cost of the hook detection circuit can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of the main body of a telephone exchange device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the same operation as above, and FIG.
-Chart, FIG. 4 is a system configuration diagram of a conventional example, FIG. 5 is a circuit diagram of the same telephone exchange system, and FIG. 6 is a route diagram of the main body of the same telephone exchange apparatus. 11 is a master hook detection circuit, 12 is an individual 7 link D
P detection circuit, A is the main body of the telephone exchange equipment, 1) is the telephone set, 1
=, , L2 is a central office line. Agent Patent Attorney Ishiguchi (Ko 7-〇

Claims (1)

[Claims] (1) Multiple telephones are connected and equipped with a simple switching function to switch between a telephone call to a central office line and an extension telephone call. When one of the telephones is hooked up, it is used in telephone exchange equipment to disconnect the telephone from the central office line and make a central telephone call.The master hook detection circuit detects the hook-up state of the telephone when a telephone call is received from the central office line, and the master hook 1. A hook-up detection circuit comprising an individual hook-up detection circuit that detects the hook-up state of each telephone when the telephone is disconnected from a central office line using the hook-up detection output of the detection circuit.