JPH05284554A - Outside line connection system - Google Patents

Abstract

PURPOSE:To store a terminal apparatus, which requires detection of polarity inversion (called subscriber response information) of a speaking current, in the telephone equipment where a speech path switch is made electronic. CONSTITUTION:A first route R1 directly connected to an outside line 6 and a second route R2 passing a speech path switch 2 are provided as routes through which extensions 71 to 7n are connected to the outside line 6. Switching relays RX1 to RXn for these two routes R1 and R2 are provided, and these relays RX1 to RXn are controlled to select the first route R1 or the second route R2 in accordance with types of terminal apparatus connected to extensions 71 to 7n at the time of connection to the outside line. Since the route directly connected to the outside line and the route passing the speech path switch are provided as routes connected to the outside line in this manner, the terminal apparatus which requires response information from the outside line can be connected to the telephone equipment without reducing the service to normal terminal apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various telephone devices such as a private branch exchange and a button telephone device having an electronic speech path switch, and a terminal device which needs to detect a polarity reversal of a speech current as response information of the other party. The present invention relates to a telephone device that enables the connection of.

[0002]

2. Description of the Related Art In a conventional telephone system in which a speech path switch is digitized, a semiconductor analog switch is used for the speech path switch in the analog system, and direct current cannot flow through the analog switch. A transformer is inserted in the to prevent direct current from flowing into the analog switch.

In the digital system, the external line circuit and the internal line circuit have analog-digital mutual conversion circuits, in which direct current is prevented from flowing into the digital switch.

A facsimile having an automatic transmission function, an answering machine with an automatic transfer function and the like need to detect the polarity reversal of the call current as response information of the other party. Since it is blocked by the external line circuit as described above, the polarity reversal of the call current is not transmitted to the internal line, so that these terminal devices could not be connected.

[0005]

SUMMARY OF THE INVENTION The present invention provides a method capable of connecting a terminal device, which needs to detect a polarity reversal of a call current, to an electronic device having an electronic call path switch as response information of the other party. To do.

[0006]

In order to solve the above-mentioned problems, a call route switching means is provided in an extension line circuit, and a first route for connecting the extension line directly to the outside line, and the extension line through the call line switch to the outside line. A second route to connect to
One of the routes can be selected by switching one route by the switching means.
If the route is selected, the extension is directly connected to the outside line to enable the polarity of DC to be detected in the terminal equipment connected to the extension line. If the second route is selected, the outside line is connected to the communication path switch. Then, by connecting to the extension, various services possessed by the telephone device can be received.

[0007]

According to the present invention, by directly connecting the external line to the internal line as described above, it is possible to connect a terminal device requiring detection of the polarity reversal of the call current to the telephone device, and In the case of other terminal devices to be connected, it is possible to receive a conventional service, for example, a service for transferring a call with an external line to another extension line, via the call path switch.

[0008]

FIG. 1 is a circuit diagram showing an embodiment of the present invention,
1 is a CPU, 2 is an electronic speech path switch, 3 is a buffer, 4 is a dial sending circuit, 5 is installation data memory, 6
Are external lines (station lines, leased lines, etc.), 71 to 7n are extensions (# 1 extension to #n extension) to which terminal devices are connected, and R1 is an extension 71.
~ R2, the first route that connects extension 7n directly to exterior 6
Is a second route for connecting the extension lines 71 to 7n via the communication path switch 2, PC01, PC02, PC11,
PC12 to PCn1 and PCn2 are photocouplers, DV0
1, DV02, DV11, DV12 to DVn1, DVn
2 is a diode, A is a relay for making a DC loop of an external line 6, a is a contact of a relay CL, and RX1 to RXn are extension lines 71.
~ 7n route switching relay, rx1 to rxn are relays R
X1 to RXn contacts, T0, T1 to Tn are transformers, R
11, R12 to Rn1 and Rn2 are resistors.

Subscriber classes that define the provision of various services corresponding to the model of the terminal equipment connected to the extensions 71 to 7n are set by the installation data stored in the installation data memory 5, and this subscription is set. Outer line 6 for senior class
The connection route with the first route R1 or the second route
The class information for determining whether the route R2 is to be included is included.

The route switching relays RX1 to RXn are controlled by the CPU 1 via the buffer 3 based on the class information. When the extension lines 71 to 7n are not in a call state, their contacts rx1 to rxn are as shown in the figure. Second
Is switched to the route R2 side.

In the embodiment shown in FIG. 1, the operation will be described by taking as an example the case where the terminal equipment connected to the # 1 extension 71 makes a call to the outside line 6.

When the terminal equipment connected to the # 1 extension 71 goes off-hook, the power supply 24V-resistor R11-transformer T1.
-Relay contact rx1-Diode DV12- # 1 extension 7
1 (terminal device) -relay contact rx1-transformer T1-resistor R12-DC current flows through the route of earth, the photocoupler PC11 is turned on by the voltage drop generated in the diode DV12, and the CPU1 is passed through the lead (I) to CPU1. Notify the extension 71.

The CPU 1 determines the subscriber class of the # 1 extension 71 based on the installation data stored in the installation data memory 5, and first determines whether the dial system of the terminal equipment connected to the # 1 extension 71 is the DP system or the PB system. When the terminal device is of the DP system, the dial pulse successively sent is taken in from the lead (I) to the CPU 1 by the turning on / off of the photocoupler PC11 which is the same as the detection of the transmission, and is counted. When the terminal device is of the PB system, the CPU 1
The extension 71 is connected to a PB receiver (not shown) via the transformer T1 by the communication path switch 2, the PB dial is received by the PB receiver, and the result is sent to the CPU 1.

When the first dial identifies the call to the outside line 6, the CPU 1 determines whether the extension 71 needs to be directly connected to the outside line 6 or the communication path switch 2 from the subscriber class of the # 1 extension 71. It is determined whether or not it is an extension to be connected via, and in the former case, the relay RX1 is driven via the buffer 3. As a result, the contact r of the relay RX1
The route RX1 is selected by switching x1 to the side opposite to that shown in the figure, and the external line 6 is directly connected to the # 1 extension 71 and the # 1 extension 71.
The terminal device connected to is connected to the external line 6 in a direct current manner. After that, the dial from the terminal equipment is # 1 extension 71
Is sent directly to the outside line 6 via the line, and if the other party answers after dialing, the polarity of the call current from the outside line 6 is reversed,
This can be directly detected by the terminal device of the # 1 extension 71.

If the subscriber class of the # 1 extension 71 is the latter, that is, if the terminal equipment connected to the # 1 extension 71 is a general terminal equipment that does not need the response information of the other party, the CPU 1 first When receiving the dial of the line to identify the call to the outside line 6, the relay RX1 is not driven (that is, the second route R2 is selected), and the communication path switch 2 is driven to # 1 extension 71 and outside line 6 Are connected via a transformer T1 and a transformer T0, respectively. Further, the CPU 1 drives the relay A to close the contact a of the relay A, and the transformer T
When 0, the DC loop for the outside line 6 is closed and the outside line 6 is started. Subsequent dials are input to CPU1 and CP
The U1 thereby activates the dial transmission circuit 4 and is transmitted from the dial circuit 4 to the outside line 6, and if the other party responds, the call is started.

The outside line call route passing through the second route R2 is the same as the call route in the conventional telephone device, and various service functions (for example, a function of transferring an outside line call to another extension line) are also different from the conventional one. There is no.

[0017]

As described above, according to the present invention, a connection path to an external line is connected to a first route directly connected to the external line and a communication path switch according to the type of terminal equipment connected to the telephone device. A terminal that has an automatic call function such as a facsimile or an answering machine with an automatic transfer function and requires response information from an outside line by selecting one of the second routes by selecting the connection path. The effect that the device can be accommodated in the telephone device and the function of the conventional telephone device can be used as it is in the terminal device which does not need the response information from the outside line is obtained.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a telephone device showing an embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Microcomputer 2 ... Electronic communication path switch 5 ... Installation data memory 6 ... External line 71-71n ... Extension line R1 ... 1st route R2 ... 2nd route RX1-RXn ... Route switching relay rx1-rx2 ... Relay RX1- RXn contact

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kei Kato 2223 Naganuma-cho, Isesaki-shi, Gunma Meisei Electric Co., Ltd. Isesaki Plant

Claims (1)

[Claims] 1. In a telephone device having an electronic speech path switch, a first route connecting directly to an outside line and terminal equipment, and a second route connecting to a terminal equipment via an outside line and an electronic speech path switch. And a switching means for selecting one of the first route and the second route, and according to the model of the terminal equipment accommodated in the telephone device, the switching means serves as a connection path to an outside line, and the first route A connection method of an outside line that enables selection of the second route or the second route.