JPS61225952A - Telephone set - Google Patents

Abstract

PURPOSE:To use an exchange of various dial signal forms while being moved freely in an exchange network without any complicated operation by providing a circuit setting automatically the dial signal form sent from a dial signal sending circuit. CONSTITUTION:A telephone set 1 is connected to an exchange 3 via a subscriber line 2. A DC loop is formed to the telephone set 1 with the exchange at application of power, and the telephone set 1 is provided with the dial signal sending circuit 10 sending a dial signal to the exchange 3 while its form is made different sequentially, a detection circuit 11 detecting the dial signal form of the exchange 3 depending on the replay from the exchange 3 to various forms of the dial signals, a memory 12 storing the detected dial signal form, a setting circuit 13 setting automatically the dial signal form sent from the dial signal sending circuit 10 based on the storage content in the memory 12 at hool-off, and a power supply 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a telephone set that selects and sets a dial signal format in accordance with the dial signal format of an exchange.

[Technical Background of the Invention] Conventionally, some switchboards used in telephone switching networks accept only one of a push button signal (PB signal @) and a dial pulse signal (DP double signal) as a dial signal. .

Therefore, there are telephones in which the dial signal format can be manually set to match the dial signal format of the exchange.

FIG. 3 is a flowchart showing the operation of the telephone and exchange when manually setting the dial signal format to match the dial signal format of the exchange in this type of telephone;
By performing an off-footer operation on the telephone side, a DC loop is formed with the exchange. When the formation of the DC loop is completed, a dial tone signal indicating the completion of the formation of the DC loop is sent back from the exchange to the telephone side. Then, after confirming this dial tone signal, the telephone transmits a dial signal based on a DP double signal or a PB double signal. Upon receiving this dial signal, the exchange stops sending out its own dial tone signal to inform the telephone that the dial signal formation matches, and connects the central office line with the telephone. However, if the dialing format does not match the switching system's own dialing format, the switching equipment does not stop transmitting the dial tone signal but continues to send it. The telephone user knows that the dial signal formats do not match because the dial tone signal continues, and switches the dial signal format to another format using the changeover switch. When the dial signal formats match according to this switching setting, the central office line between the telephone and the exchange is connected. [Problems with the Background Art] However, in the above-mentioned conventional telephones, the dialing signal formats of the exchange and the telephone are made to match by manually switching the changeover switch on the telephone, so the dialing signal format is unknown. When using the telephone by connecting it to an exchange, the switch must be operated each time the exchange to be connected is changed, and the telephone must be moved to the exchange network of an exchange with a variety of dial signal formats. There was a problem that the actual management was troublesome.

[Object of the invention] The object of the present invention is to eliminate the above-mentioned drawbacks and provide a telephone that can be freely moved and used within exchange networks of exchanges of various dial signal formats without complicated operations. shall be.

[Summary of the Invention] The present invention includes a dial signal sending circuit that forms a DC loop with an exchange at a predetermined time and sequentially sends dial signals of different formats to the exchange; A detection circuit that detects the dial signal format of the exchange based on a response, a memory that stores the detected dial signal format of the exchange, and automatic setting of the dial signal format sent from the dial signal sending circuit based on the stored contents of the memory. The above object is achieved by providing a setting circuit.

[Embodiments of the Invention] The present invention will be described in detail below based on illustrative embodiments.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which a telephone 1 is connected to an exchange 3 via a subscriber line 2. As shown in FIG.

The telephone 1 includes a dialing signal sending circuit 10 that forms a DC loop with the exchange when the power is turned on, and sequentially transmits the format of the dial signal to the exchange 3, and an exchange that responds to each type of dial signal. a detection circuit 11 that detects the dial signal format of the exchange 3 based on a response from the exchange 3; a memory 12 that stores the detected dial signal format; A setting circuit 13 for automatically setting the dial signal format to be sent out and a power supply 14 are provided.

FIG. 2 is a flowchart showing the operations of the telephone 1 and the exchange 3 when matching the dial signal format of the telephone 1 with the dial signal format of the exchange 3. Circuit 10 forms a DC loop for exchange 3. On the other hand, when the formation of the DC loop is completed, the exchange 3 sends a dial tone signal to inform the telephone 1 of the completion of the formation of the DC loop. After confirming the dial tone signal, the telephone 1 first sends out one PB double signal. Then, when the dial signal sent by telephone 1 matches the dial signal format of exchange 3, exchange 3 stops sending the dial tone signal. However, when the dial signal formats do not match, the dial tone signal continues to be sent.

When the detection circuit 11 of the telephone 1 detects that the dial tone signal from the exchange 3 has been stopped, it determines that the dial signal format of the exchange 3 is the PB signal format, and changes the dial signal format via the setting circuit 13. Set to PB signal format. At the same time, information representing this signal format is written into memory 12.

On the other hand, when the detection circuit 11 detects that the dial tone signal is still being sent from the exchange 3 even after a certain period of time has elapsed, it determines that the dial signal format of the exchange 3 is not the PB signal format, and this time the dial tone signal is sent out. One DP multiplied signal of 20 PPS is sent out from the circuit 10.

On the other hand, if the exchange 3 has its own dial signal format as a 20PPS DP signal format, as in the case described above,
stop sending dial tone signals to telephone 1;
If the signal is not in the DP signal format, the dial tone signal continues to be sent.

Therefore, if the dial tone signal from the exchange 3 is stopped, the detection circuit 11 of the telephone 1 determines that the dial signal format of the exchange 3 is the 20PPS DP signal format, and sends the dial tone signal via the setting circuit 13. Sending circuit 10
At the same time as setting the dial signal format to the PB signal format, information representing this signal format is written into the memory 12.

However, if the dial tone signal from exchange 3 continues, the dial signal format of exchange 3 is 20PPS.
It is determined that the signal is not in the DP signal format, and then the 10 PPS DP double signal is sent out from the dial signal sending circuit 11.

The detection circuit 11 determines the response of the exchange 3 to the sending of the DP double signal of 10 PPS in the same manner as in the above case, and detects the dial signal of the dial signal sending circuit 10 in response to the stop or continuation state of the dial tone signal from the exchange 3. Set the format.

When the dial signal format of the exchange 3 is confirmed as described above and the setting of the dial signal format of the dial signal sending circuit 10 is completed, the office line between the telephone 1 and the exchange 813 is connected.

However, if the dial signal format cannot be confirmed even after repeating the above operation twice, the detection circuit 1
1 causes the dial signal sending circuit 10 to interrupt the DC loop with the exchange 3.

In this manner, the dial signal format of the exchange 3 is automatically confirmed when the power source 14 is turned on, and the dial signal format of the dial signal sending circuit 10 is automatically set based on the confirmation. This eliminates the need to confirm the dial signal format when the telephone 1 is connected to an exchange whose dial signal format is unknown.

Furthermore, since the dial signal format once confirmed is stored in the memory, the confirmation operation only needs to be performed once, and unnecessary use of the line for confirming the dial signal format can be eliminated.

In the above embodiment, the dial signal format is checked when the power is turned on, but it may be automatically checked at an appropriate time triggered by off-hook operation or generation of a time signal such as a timer.

Further, the response from the exchange is not limited to the dial tone signal, but other signals may be used.

By the way, in the above embodiment, a DC loop is formed as soon as the power is turned on, and it is interpreted that the DC loop remains formed until the power is turned off. This creates a contradiction in that calls can be made but calls are not received.

Therefore, the DC loop is only formed for a certain period of time from when the power is turned on until the dial signal format is detected and memorized, and after that, the DC loop is only formed when the handset is off-hook, just like a conventional telephone. is configured to form a At the same time as the DC loop is formed, the dial signal is sent out from the dial signal sending circuit 10 via the setting circuit 13 according to the format stored in the memory 12, and connected to the central office line.

[Effects of the Invention] As explained above, the present invention automatically checks the dial signal format of the exchange at a predetermined time and automatically sets the dial signal format of the telephone based on the confirmation, thereby eliminating the need for complicated operations. It can be freely moved and used within the exchange networks of exchanges of various dial signal formats without any operations. 4. Brief description of the drawings Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is a flowchart showing the operation for confirming the dial signal format, and Fig. 3 is the dial signal format in a conventional telephone. This is a flowchart showing the confirmation operation.

DESCRIPTION OF SYMBOLS 1... Telephone, 2... Subscriber line, 3... Exchange, 10... Dial signal sending circuit, 11... Detection circuit, 12... Memory, 13... Setting circuit, 14・・・
·power supply.

Figure 1 Figure 3

Claims (3)

[Claims] (1) In a telephone whose dial signal format is set to match that of the exchange, a dial signal sending circuit that forms a DC loop with the exchange at a predetermined time and sequentially sends dial signals of different formats to the exchange. a detection circuit that detects the dial signal format of the exchange based on responses from the exchange to dial signals of each format; a memory that stores the detected dial signal format of the exchange; A telephone equipped with a setting circuit that automatically sets the dial signal format sent out from the sending circuit. (2) The telephone according to claim (1), wherein the dial signal sending circuit forms a DC loop when the telephone is powered on. (3) The detection circuit detects the dial signal format by detecting either the stoppage or the continuation of the dial tone from the exchange. phone.