JPH0311986Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a speech level switching device for telephone lines, and in particular, the present invention relates to a speech level switching device for telephone lines, and in particular, the switching device is suitable for use when a plurality of telephone lines are accommodated in close proximity, such as in a button telephone device. The present invention relates to a speech level switching device when installed in a device.

[Prior art]

For telephone equipment connected to telephone lines such as central office lines,
A speech level switching device is installed in the telephone equipment to compensate for fluctuations in speech level due to differences in the line length to the telephone station to which it belongs, and when the line length is short, an attenuator is applied to the telephone line by switching the switching device. (so-called 3dB pad) is inserted.

By the way, when a call level switching device is provided in a telephone device such as a button telephone device in which a plurality of telephone lines (office lines) are accommodated in close proximity, in order to reduce crosstalk between the telephone lines, Even if an attenuator is inserted into the speech line by switching the speech level, the balance between the two lines must be maintained, and therefore the attenuator may be inserted into one line as shown in FIG. (hereinafter referred to as A line) The circuit elements (resistors R ₁ , R ₂ and capacitor C) inserted on the a side and the circuit elements (resistance R ₁ , _R2 and capacitor C) must be constructed in the same way.

Conventionally, a switching device that connects and disconnects an attenuator, which has a configuration in which circuit elements are inserted into two wires of the communication path, connects and disconnects the attenuator from the communication path, as shown in FIG. and B line b, each of which is provided with a link mechanism that connects and separates the attenuator. That is, the A line a is provided with terminals T ₁ and T ₃ that directly connect the office line side and the telephone side, and terminals T ₂ and T ₄ that connect the office line side and the telephone side via an attenuator. Similar terminals T ₅ , T ₇ and T ₆ , T ₈ are provided on the B line b, and between the terminals T ₁ and T ₂ , between the terminals T ₃ and T ₄ ,
A mechanism that connects and disconnects the attenuator from the communication path by changing the connections between terminals T ₅ and T ₆ and between terminals T ₇ and T ₈ using connection links L ₁ , L ₂ , L ₃ and L ₄ , respectively. It's summery.

[Problem that the invention attempts to solve]

The conventional speech level switching device described above requires four connection links per telephone line. If the number of connection links is large, not only is it easy to forget to switch the call level when switching, but it is also undesirable in terms of the number of parts and the space for mounting the parts.

The present invention is proposed to solve the above problems.

[Means for solving problems]

In order to solve the above problems, the present invention short-circuits the circuit element inserted into the first line of the communication path by replacing the first connection link, or inserts it into the second line of the communication path. Connect one end of the circuit element to the second line, and short-circuit the circuit element insertion point of the second line of the communication path by replacing the second connection link, or The other end of the circuit element to be inserted into the line is connected to the second line, and the number of connection links is two per telephone line.

[Configuration of Example]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIGS. 2 and 3 are perspective views showing the structure of the embodiment of the present invention.

As shown in Figure 1, the attenuator has a resistance on the A line a side.
R ₁ and R ₂ are connected in series with resistors R ₃ and R ₄ respectively on the B line b side, and the connection point of resistors R ₁ and R ₂ and resistor R ₃ ,
A capacitor C is connected between the connection points of _R4 , and the configuration of this attenuator itself is the same as that of the conventional example (No. 4).
The structure of the link mechanism is different from that of the conventional example, as will be explained below.

That is, both ends of the series circuit of resistors R ₁ and R ₂ inserted into the A wire a are connected to the two connection pieces that constitute the terminal T ₁ , and the resistors R ₃ and R to be inserted into the B wire b Resistor R ₃ side end of series circuit of ₄ and B wire b
The central office line side is connected to the two connection pieces that constitute terminal T ₂ , and the central office line side of line B and the telephone side (both ends of the place where the series circuit of resistors R ₃ and R ₄ should be inserted) ) are connected to the two connection pieces that make up terminal T ₃ , and furthermore, the end on the resistor R ₄ side of the series circuit of resistors R ₃ and R ₄ and the telephone side of wire B make up terminal T ₄ . They are each connected to two connecting pieces. The link _L1 changes the connection between the terminals _T1 and _T2 , and the link _L2 changes the connection between the terminals _T3 and _T4 .

Specifically, the link mechanism is constructed by using a connector as shown in FIG. 2, for example. In other words, two pins each of 1 and 2 of a 4-pin jack type connector (hereinafter referred to as J connector) are used as the above-mentioned terminals T ₁ , T ₂ and T ₃ , T ₄ respectively, and a plug type connector with 2 pin configuration is formed. (Hereinafter, P
It's called a connector. ) Connect the two pins 3 and 4 to form connection links L ₁ and L ₂ . P connector 3 can be inserted and connected to either terminal T ₁ or T ₂ of J connector 1, and P connector 4
can be inserted and connected to either terminal T ₃ or T ₄ of J connector 2.

Further, the above link configuration can also be configured as shown in FIG. That is, 2 pins each of J connectors 5 and 6 with a 4-pin configuration are connected to the terminals T ₁ and T ₃ respectively.
and T ₂ , T ₄ , and connect two pins each of the P connector 7 having a 4-pin configuration to integrally constitute connection links L ₁ and L ₂ . The P connector 7 can be inserted and connected to either the J connectors 5 or 6.

[Effect of the embodiment]

If the line length to your station is long and you do not want to insert an attenuator into the telephone line, insert and connect link L ₁ to terminal T ₁ and link L ₂ to terminal T ₃ (first
Figure, connections shown in solid lines). In the example shown in FIG. 2, this connection is made by inserting the P connector 3 into the T ₁ side of the J connector 1 and the P connector 4 into the T ₃ side of the J connector 2. In the example shown in , this is done by inserting the P connector 7 into the J connector 5.

When the above connection is made, both ends of the series circuit of the resistors R ₁ and R ₂ inserted in the A line a are short-circuited by the connecting link L ₁ , and the series circuit of the resistors R ₃ and R ₄ of the B line b is inserted. The telephone set is connected directly to the central office line by connecting the stations with a connecting link _L2 .

When inserting an attenuator into the telephone line because the line length to the assigned station is short, insert and connect link L ₁ to terminal T ₂ and link L ₂ to terminal T ₄ (first
Figure, connections shown by dotted lines). In the example shown in FIG. 2, this connection is made by inserting the P connector 3 into the T ₂ side of the J connector 1, and the P connector 4 into the T ₄ side of the J connector 2. In the example shown in , this is done by inserting the P connector 7 into the J connector 6.

When the above connection is made, since the two pins of terminal T ₁ are open, there is a resistance R ₁ on A wire a,
A series circuit of R ₂ is connected, and the two pins of terminals T ₂ and T ₄ are closed by links L ₁ and L ₂ , respectively, so that resistances R ₃ and R ₄ are connected to B line b.
series circuit is connected. Therefore, the phone is a resistor
It will be connected to the office line via an attenuator composed of R ₁ to _{R 4} and a capacitor C.

[Effects of the invention] As is clear from the above explanation, according to the invention, the number of connection links required for the call level switching device is reduced to 2.
The number of connection links is extremely small compared to conventional connection links, making it possible to switch the call level in a short time, and the chances of forgetting to switch at that time are extremely reduced.In addition, the number of connectors used for connection links is also small. Therefore, it contributes to cost reduction and downsizing of the device.
Furthermore, if the present invention is implemented in the manner shown in FIG.
The above two connection links can be integrated, the efficiency of call level switching work is further improved, and forgetting to switch is virtually impossible. As described above, the present invention has extremely large effects.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, FIGS. 2 and 3 are perspective views showing the structure of an embodiment of the present invention, and FIG. 4 is a circuit diagram of a conventional example. Main symbols, T ₁ to T ₄ ... terminal, L ₁ , L ₂ ... connection link, 1, 2, 5, 6 ... jack type connector (J connector), 3, 4, 7 ... plug type connector (P connector).

Claims (1)

[Scope of utility model registration request] In a speech level switching device which switches the speech level by inserting and removing an attenuator into a communication path between a telephone line and a telephone set, a first Attenuator circuit element R ₁ ,
_R2 , the second attenuator circuit elements _R3 and _R4 inserted into the other line b of the communication path, and the first attenuator circuit elements _R1 and _R2 . a first link connector T 1 forming the first link connector T ₁ , a second link connector T ₂ forming a connection path between the second attenuator circuit elements R ₃ , R ₄ and the central line; a fourth link connector T ₄ forming a connection path between the attenuator circuit elements R ₃ , R ₄ and the telephone;
and a third link connector T 3 forming a short circuit between the connection point between the second link connector T ₂ and the office line, and the connection point between the fourth link connector T ₄ and the telephone _set . and a first connection link that is selectively inserted into either the first link connector _T1 or the second link connector _T2 .
A speech level switching device comprising a second connection link L ₁ and a second connection link L ₂ that is selectively inserted into either the third link connector T ₃ or the fourth link connector T ₄ .