JP2815878B2 - Home telephone exchange - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a home-use simple telephone exchange that performs connection switching between office lines and extensions and connection switching between extensions.

[Prior Art] FIG. 12 shows a main part circuit of a switching device main body of a conventional home telephone switching device. The switching apparatus in the body being adapted to connect the three phones, each phone is connected to the office line l and extension call network 19 comprising a pair of signal lines by a relay Ry ₁ to Ry _3. Relay Ry ₁ to Ry ₃ usually is connected to the central office line l side is switched to the extension call network 19 side when performing extension call. The control of the internal call network 19 and the relay Ry ₁ to Ry ₃ is performed in the normal CPU.

When a command such as a hold request is issued from the telephone 1 in such a home simple telephone exchange, a dial signal is normally used. However, when a command such as a hold request is issued by a dial signal, the dial signal leaks to the office line l.

In addition, in a home simple telephone exchange that can connect a push-button (hereinafter, bush button is abbreviated as PB) dial-type telephone, a PB receiver that receives a PB signal is provided, and the telephone is connected to this PB receiver. There is a way for the CPU to identify the command from the output of this PB receiver,
In this case, the telephone must be connected to the PB receiver for a certain period of time after hooking, which causes a problem that the call is interrupted.

Furthermore, in the conventional home telephone exchange, there is a telephone in which a telephone is connected to a central office only via an AC via a capacitor, a transformer, an analog switch, etc., and the telephone is not directly connected to the central office. In this home telephone exchange apparatus, a DC closing circuit is provided in order to perform DC closing of the office line. This method has an advantage that a dial pulse or the like is not output from the telephone to the office line during the office line call, and the current supplied to the telephone is stabilized. But,
Since the telephone is not directly connected to the office line, there is a problem that the telephone cannot know the DC voltage and polarity of the office line.

[Problems to be Solved by the Invention] The present invention has been made in view of the above points, and an object of the present invention is to provide a telephone line that performs direct line communication using a direct connection path. Even if the DC loop is temporarily opened due to a dial pulse or hooking of the telephone during a call, a simple home-use telephone exchange device is provided in which the DC loop of the office line is not turned off and the call state is not interrupted during that time. Is to do.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a direct connection call path for directly connecting a telephone to an office line, and connecting the telephone only to the office line via an extension telephone network in an alternating manner. If the DC loop is temporarily opened due to the dial pulse or hooking of the telephone during the call, when the telephone is performing the local line communication using the direct connection communication path, When this is detected, the line communication path is switched to the AC coupling path by the relay, and when the DC loop is restored, the path is switched to the direct connection path.

[Operation] The present invention includes a direct connection communication path and an AC coupling path as the local line communication paths as described above, and when the telephone is performing the local line communication using the direct connection communication path, the telephone set during the telephone call is used. When the DC loop is temporarily opened due to dial pulses or hooking, this is detected and the local line communication path is switched to the AC coupling path by the relay, and when the DC loop is restored, the direct line communication path is switched to the direct line communication path. The DC loop is not turned off, and the call state is not interrupted.

Embodiment FIG. 1 shows a basic configuration of the present embodiment. The telephone 1 according to the present embodiment has a hook / hook for detecting normal hooking and a dial pulse (hereinafter, this dial pulse is abbreviated as DP).
Via the DP detection circuit 2, it is connected to the office line 1 connected to the normally closed (NC) contact of the relay Ry. The normally open (NO) contact side of the relay Ry is connected to the central office l only through the transformer T and the capacitor C. In other words, as a telephone line communication path of the telephone 1, a path in which the relay Ry is switched to the NC contact side and the telephone 1 is directly connected to the telephone line 1 (hereinafter, referred to as a direct connection communication path).
And a path (hereinafter referred to as an AC coupling path) in which the relay Ry is switched to the NO contact side and the telephone set 1 is connected to the local line l only in an AC manner. The AC coupling path includes
A DC closing circuit 3 for forming a DC loop and a call current supply circuit 4 for supplying a call current to the telephone 1 are provided.

The overall configuration of the home simple telephone exchange of the present embodiment is shown in FIG.
Shown in the figure. The home simple telephone exchange apparatus, a switching apparatus main body A, 3 phones 1 ₁ to 1 ₃ is made of a telephone outlet B ₁ .about.B ₃ Metropolitan which are respectively connected. Exchange apparatus main body A is connected to a central office by a central office line l, is connected to a telephone outlet B ₁ .about.B ₃ by extension L ₁ ~L ₃ consisting of a call and control wires, the office line l and the extension L ₁ ~L ₃ and performs connection switching between the extension L ₁ ~L _3, are to be able to perform the central office line calls and internal call from the telephone 1 ₁ to 1 _3. Also telephone outlet
B ₁ .about.B ₃ is modular outlets for connecting the telephone 1 ₁ to 1 ₃
20 and display light-emitting diodes LD ₁ and LD ₂ for displaying the state of a local line call and an internal line call, and a speaker SP for notifying a notification sound or the like. Incidentally, intercom C _1, C ₂ in this switching apparatus main body A, the security device D, very pushbutton E is also connected, by telephone 1 ₁ to 1 ₃ can do call the doorphone C _1, C _2, the security device D When a security signal is input or when the emergency push button E is pressed, the telephone outlet
B ₁ from the speaker SP of .about.B ₃ are adapted to emit an alarm sound.

FIG. 3 shows a circuit configuration of the exchange apparatus main body A. The changer body A, and a telephone 1 ₁ to 1 ₃ every relay Ry ₁ to Ry _3, hook · DP detector 2 ₁ to 2 ₃ and speech current supply circuit 41 _{to 3.} Other configurations include an incoming call detection circuit 5 for detecting an incoming call from the local line 1, a DP generating circuit 6 for generating a DP for making a local line call, a PB dialer 7 for performing a PB dial, a local line A local line tone detection circuit 8 for detecting a tone, a hold tone sending circuit 9 for sending a hold tone, a crosspoint switch 10 for setting a communication route, PB receivers 12 and 13 for receiving a PB signal on an AC coupling route, a diode. Bridge D
B, gates G _{1 to} G ₃ , and a control circuit 11 composed of a CPU for controlling the transmission of a control information signal of each of the above circuits and a circuit to be described later and performing a signal determination process.

For a call with intercom C _1, C ₂ each other on the phone 1 ₁ to 1 ₃ In the changer body A, intercom C _1,
Intercom call detection circuit for detecting a call from C ₂ 14 _1, 14 ₂
And a door phone communication circuit 15. Further, if the if the security signal from the security device D is output and is very pushbutton E is pressed, for emitting an alarm sound from the telephone outlet B ₁ .about.B ₃ of telephone 1 ₁ to 1 ₃ of each are connected , security signal detecting circuit 16, a sound generating circuit 17 for generating various notification sound, an amplifier aMP ₁ ~AMP _4. Further, telephone office line calls and internal call status outlet B ₁ .about.B ₃
A display control circuit 18 is provided for displaying the image on the display.

Hereinafter, an operation that is a feature of the present embodiment will be described.
First, a case where a DC loop is temporarily opened due to DP or hooking of the telephone 1 during a telephone call while any telephone 1 is performing a local line communication using the direct connection communication path will be described with reference to FIG. . In this embodiment, when the DC loop is turned off by the DP and hooking shown in FIG.
This is detected by the hook / DP detection circuit 2, and the relay Ry is switched to the AC coupling path side as shown in FIG. At this time, since the DC closing circuit 3 is operated as shown in FIG. 4 (c), the DC loop of the local line 1 is turned off for a moment as shown in FIG. 4 (d). Note that the operation of switching the relay Ry to the AC coupling path side is maintained for a fixed time T ₁ (for example, 100 ms) even when the DC loop of the telephone is closed. However, the switching of the office line communication path is performed only once. As described above, when the DC loop is turned off by the DP or hooking of the telephone 1, by switching the line communication path from the direct connection path to the AC coupling path, the DP or hooking pulse is output to the line l. Can be prevented. Incidentally, when the direct current loop has passed a predetermined time T ₁ to recover, it switched to direct call path. The above operation flow is shown in FIG.

By the way, if the DC loop is not turned off by the hooking of the telephone 1 as described above, it becomes impossible to output the hooking pulse for receiving the hooking service of the office line l. Therefore, when hooking is performed on the telephone 1, a hooking pulse is output to the office line 1 as follows. That is, if the hooking in the telephone 1 as shown in FIG. 6 (a) is performed to switch the relay Ry predetermined time T ₂ as shown in FIG. (B) to the AC coupling path side, FIG. (C When the time T ₄ to check has passed that) in a hooking as shown, turns off the DC閉結circuit 3 by a predetermined time T _3. Thus, the DC loop of the station line l as shown in (d) of FIG is turned off for a certain time T _3, so that the hooking pulse is output to the office line l. FIG. 7 shows an operation flow when this hooking is performed.

Next, command input when the telephone 1 of the PB dial system is used will be described. If the telephone 1 of the PB dial system is connected, and the telephone 1 is holding a telephone call using the direct connection call path, and wants to hold the telephone call, hook the telephone and within a certain period of time, the PB signal To enter the "hold" command. In other words, Figure 8 after a predetermined time T ₁ of the after the phone 1 was hooking (a), the same figure (b) by a predetermined time T ₂ as shown in the central office line call path is AC coupled path side Is switched to. Therefore, the reception state of the "Hold" command PB receiver 12 provided to the AC coupling path by the predetermined time T _2. At this time, if a "hold" command is input, it is possible to hold an office line call and make an extension call. If there is no nothing operated within a predetermined time T _2, the relay Ry is switched to direct call path side as indicated by the broken line in FIG. (B), the office line call is resumed. The operation flow in this case is shown in FIG.

The PB dial type telephone 1 outputs a hooking pulse to the central office 1 by the PB signal. When a hooking pulse is output to the local line 1, hooking is temporarily performed as shown in FIG. 10 (a) to make the PB signal receivable, and a hooking command is input by the PB signal as shown in FIG. 10 (e). I do. In this case, from this command input further counting of the predetermined time T ₂ is started, the DC閉結circuit 3 as shown in FIG. 10 (c) within this time T ₂ is turned off, the hooking pulse office line l Is output. The operation flow in this case is shown in FIG. As described above, in this embodiment, even if the DC loop is temporarily opened by the DP or hooking of the telephone 1 during the office line communication, the DC loop for the office line 1 is disconnected for a long time by switching the office line communication path. Never be. The hooking service that cannot be received when the DC loop is not cut for a long time can be received by the control of the DC closing circuit 3 by the control circuit 11.

[Effects of the Invention] As described above, the present invention provides a direct connection call path for directly connecting a telephone to a central office line and an AC coupling path for connecting the telephone only to an office line via an internal telephone network. When a DC loop is temporarily opened due to a dial pulse or hooking of the telephone during a call while the telephone is making a local line call using the direct connection call path, this is detected and detected as a telephone line. The call path is switched to the AC coupling path by the relay, and when the DC loop is restored, it is switched to the direct connection path, so that the DC loop does not turn off for a long time, so that the call state is not interrupted during that time. And prompt operation of internal and external lines is possible. Moreover, if you connect your telephone to the office line via a direct call path,
The telephone can know the DC voltage and polarity of the office line.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a main part of an embodiment of the present invention, FIG. 2 is a system configuration diagram of the above embodiment, FIG. 3 is a block diagram showing a circuit configuration of a switching device main body of the above embodiment, and FIGS. FIG. 12 is an explanatory diagram of the operation of the above, and FIG. 12 is a circuit diagram of a main part of a conventional example. 1 is a telephone, 2 is a hook / DP detection circuit, 3 is a DC closing circuit, 1 is a local line, and Ry is a relay.

Continuation of front page (56) References JP-A-61-237595 (JP, A) JP-A-61-95186 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04Q 3 / 58

Claims (5)

(57) [Claims] A commercial telephone is used as an extension telephone,
In a home simple telephone exchange device for switching between the telephone set to an office line and an extension communication network by a relay to perform an office call and an extension call, a direct connection communication path for directly connecting the telephone to the office line, and an extension communication network. An AC connection path that is connected to the office line only in an AC manner is provided as the office line communication path, and when the telephone is performing the office line communication using the direct connection communication path, the dialing pulse or hooking of the talking telephone causes When the DC loop is temporarily opened, this is detected and the local line communication path is switched to an AC coupling path by a relay, and when the DC loop is restored, the switching is made to the direct connection communication path. . 2. When the DC loop is temporarily opened by hooking, the state in which the local line communication path is switched to the AC coupling path is maintained for a certain period of time, and the DC loop is temporarily provided by the DC closing circuit provided in the AC coupling path. 2. The home telephone exchange according to claim 1, wherein a loop is opened to output a hooking pulse to the office line. 3. A push-button dial telephone is used as an extension telephone, and a push-button receiver for receiving a push-button dial signal is provided on an AC coupling path. When the DC loop is temporarily opened by hooking from the telephone during a call, the state in which the local line communication path is switched to the AC coupling path is maintained for a certain period of time, and the push button signal from the telephone is transmitted to the push button receiver. 2. The home telephone exchange according to claim 1, wherein the mobile telephone is set to be in a receivable state, and after the lapse of the predetermined time, the office line communication path is returned to the direct connection communication path. 4. When the push button signal received by the push button receiver is a signal indicating hooking, the state where the local line communication path is further switched to the AC coupling path from this point is maintained for a certain period of time to prepare for the AC coupling path. 4. The home telephone exchange according to claim 3, wherein a DC loop is temporarily opened by a DC closing circuit to output a hooking pulse to an office line. 5. The simple home telephone exchange according to claim 1, wherein any one of the local line communication routes is selected by a dial signal and hooking from the telephone.