JPH0226495A - Button telephone device - Google Patents

Abstract

PURPOSE:To improve an operating service by character-displaying the condition of a short circuit fault at the display part of the button telephone of a transmitting side by the short circuit detection of a short circuit protecting circuit detecting part. CONSTITUTION:When an error exists in a receiving code and when a called extension is busy and meets a fault, a short circuit protecting circuit detecting part 15 of a telephone interface part 12 execute the detecting of a condition. Then, on receiving a fault signal by the short circuit protecting circuit detecting part 15 of the telephone interface part 12, the display signal of a fault condition is transmitted to a button telephone 20 of a calling side and character-displays fault information at a character display board 21 of the button telephone 20 of the calling side. Thus, a transmitter can notice the content of the fault.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a button telephone device, and particularly to a button telephone device having a plurality of central office lines,
The present invention relates to a button telephone device having a control means for connecting and controlling a plurality of key telephones.

[Conventional technology]

Conventionally, in this type of button telephone device, power is supplied to the button telephone from a telephone interface section. This button telephone power supply circuit has a
Fuses are commonly used as short circuit protection circuits.

If the power supply current exceeded the allowable capacity current due to a fault in the button telephone or the line, the line was protected from short circuits by cutting the fuse.

If another extension telephone makes a call to a button telephone on a track where the fuse has been cut, the main device cannot connect to the extension, so regardless of the cause, the telephone that made the call will receive a message indicating that the extension cannot be connected. Control was performed to send a tone and display signal to the calling party's extension telephone to indicate that the call extension was not connected.

[Problem to be solved by the invention]

The above-mentioned conventional button telephone device always emits a disconnection signal tone (error signal tone) and a disconnection indication signal (error indication signal) when connection to the called extension is impossible, regardless of the state or cause of the failure. Since the caller is configured to transmit to the calling party's extension, it has the disadvantage that the caller cannot know whether the called extension is actually disconnected or whether there is a failure due to a disconnection of the protection circuit. .

[Means to solve the problem]

The button telephone device of the present invention includes a button telephone having a display section and a main device, and the main device has a telephone interface section that accommodates a connection line of the button telephone, a line interface section that accommodates a plurality of lines, In the button telephone device, the key telephone device includes a call path switch unit that connects the key telephone set and the line, and a control unit that controls the telephone interface unit, the call path switch unit, and the line interface unit, wherein the main device The telephone interface section includes a short-circuit protection circuit detection section for detecting a short circuit of the connection line for power supply to the button telephone, and in the case of detection of the short circuit, the display section of the button telephone on the calling side is provided with the short-circuit protection circuit detection section. It has a control means for displaying short circuit detection information.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing an example of the operation procedure at the time of receiving a call in this embodiment shown in FIG. 1, and FIG. 3 is an outgoing call corresponding to FIG. It is a flowchart which shows an example of the operation procedure to the side.

In FIG. 1, the button telephone device of this embodiment is a main device 1.
A plurality of button telephones 20 each having a character display board 21 and a telephone line 30 are accommodated at the front.

The main device 10 includes a communication path switch 11, a telephone interface section 12, a line interface section 13, and a control section 1.
4.

The call path switch 11 accommodates the call path of the button telephone 20 via the telephone interface unit 12 and the call path of the telephone line 30 via the line interface unit 13, and interconnects them under the control of the control unit 14. It also interconnects the key telephones 20.

The telephone interface unit 12 connects the communication path with the button telephone 20 to the communication path switch 11, and data of the button telephone is sent to the control unit 14.

The line interface unit 13 connects the communication path of the telephone line 30 to the communication path switch 11, and sends control data to the control unit 14.

The control unit 14 processes program data stored in the microprocessor and data input from each connection unit to control the communication path switch 11 and calls.

The telephone interface section 12 includes a short circuit protection circuit detection section 1.
5, and detects the state of the internal short-circuit protection circuit.

Next, FIG. 1 shows the main operating procedure of this embodiment.

This will be explained with reference to FIG.

When call information is sent from one of the extension key telephones 20, this data is sent to the control section 14 via the telephone interface section 12.

Based on the call data from the extension key telephone 20, the telephone interface unit 12 is connected to the corresponding key telephone 20.
The control unit 14 performs the procedure of sending the incoming call data via SL)0 based on the data from the key telephone 20 that made the call.
notifies the corresponding key telephone 20 and issues a ringing signal.

FIG. 2 shows an example of the operation procedure in the case of the extension direct dial connection method. Following step S1, the control unit 14 receives the dial number of the key telephone fi20 of the called extension (step S2).
)do.

The control unit 14 determines that there is no error in the received code (procedure S3),
When it is determined that the called extension is free (step S4), the called extension is called (step S5). Next, when the control unit 14 receives a response from the called extension (step S6) via the telephone interface unit 12, the control unit 14 connects the key telephone 20 of the called extension and the key telephone 20 of the originating extension that received the incoming call. The communication unit switch 11 is connected in a controlled manner in step S7).

The procedure up to this point is the same as the conventional one, and the subsequent procedure is a feature of this embodiment.

When the short-circuit protection circuit detection unit 15 does not detect a fault until the called extension responds in step S6 described above, and when a fault is encountered (
Step S8) If not, repeat the procedure until the called extension answers.

If there is an error in the received code in step S3, if the called extension is in use in step S4, or if a failure is encountered in step S8, the short-circuit protection circuit detection unit 15 of the telephone interface unit 12 detects the condition. For step S3, an error code signal is sent (step S9), for step S4, a busy signal is sent (step 5IO) L, and in step S8, a fault signal is sent to the calling side (step 5ll) to end the procedure.

The present invention is not limited to the example described above as long as the state of connection failure can be identified and detected.

Next, the sequence for the originating side when processing various signals in a connection-disabled state will be explained using FIGS. 1 and 3 together.

First, the control unit 14 detects a call from one of the key telephones 20 via the telephone interface unit 12 (step 521).
do. The dial code operated by the caller is sent to the control unit 14 via the telephone interface unit 12, and the called party receives an incorrect code (step 522) and a busy signal (step 32).
3) When a response signal is received (step 525) without receiving a connection failure signal such as a failure signal (step 524),
The control unit 14 sends a response signal to the key telephone 20 that made the call, and displays the response (step 826).

After sending the dial code in step S21, the control unit 14 displays a code error when receiving an incorrect code signal (step 527), displays that the other party is talking when a busy signal is received (step 528), and further displays the message on the telephone interface unit. When a fault signal is received by the short-circuit protection circuit detection unit 15 of No. 12, a fault state display signal (step 529) is sent to the calling side key telephone 20, and the fault is displayed on the character display board 21 of the calling side button telephone 20. Display information in text.

〔Effect of the invention〕

As explained above, the present invention is capable of displaying text on the display section of the caller's button telephone to indicate the state of a short circuit fault by detecting a short circuit in the short circuit protection circuit detection section for the power supply circuit to the button telephone in the telephone interface section of the main device. With this configuration, the caller can know the cause of the connection failure or failure and take appropriate measures.
This has the effect of improving operational services.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing an example of the operation procedure when a call is received in this embodiment shown in FIG. 1, and FIG. 3 corresponds to FIG. 2. 3 is a flowchart illustrating an example of an operation procedure for a calling side. 10... Main device, 11... Communication path switch, 12.
...Telephone interface section, 13...Circuit interface section, 14...Control section, 15...Short circuit protection circuit detection section, 20...Button telephone, 21...Character display board, 30... telephone line. No. fertilization

Claims (1)

[Claims] The main device includes a telephone interface section that accommodates a connection line of the button telephone, a line interface section that accommodates a plurality of lines, and a main device that connects the button telephone and the lines. In the button telephone device, the main device includes a call path switch section that connects each other, and a control section that controls the telephone interface section, the call path switch section, and the line interface section. a short-circuit protection circuit detecting section for detecting a short circuit in the connection line for power supply to the telephone; control for displaying the short-circuit detection information on the display section of the button telephone on the calling side when the short circuit is detected; A button telephone device characterized in that it has means.