JPS6376695A - Key-in tone sending system - Google Patents

Abstract

PURPOSE:To reduce erroneous connections or non-connections by disconnecting a connecting path between a channel and a telephone during the transmission of a key-in tone in order not to send the key-in tone, if there is any channel connected at the time of sending the key-in tone to the telephone set. CONSTITUTION:When a central processing unit 5 reads in dial information, it controls a switch 1 to close cross points P3 and P4, at the same time open at least one of cross points P1 and P2 which connect a central office line CO and a telephone set TEL and starts a key-in tone generating unit 3. The key-in tone outputted from the key-in tone generating unit 3 is transmitted to the telephone set TEL via the cross points P4 and P3 of the switch 1. In this time, since at least one of the cross points P1 and P2 of the switch 1 opens, it does not happen that the key-in tone is sent to the central office line CO (central office truck) via the cross points P4, P3, P1 and P2.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for transmitting key-in tones in a telephone exchange device such as a push-button telephone device. When an operation is performed, a confirmation tone is normally sent to the telephone each time the dial operation is performed to confirm the dial operation. This confirmation sound is generally called a key-in tone.

By the way, for example, in the case of a so-called stand-alone telephone that is directly connected to a central office line, the telephone is usually equipped with a dial signal oscillator, so a key-in tone can be easily transmitted to the telephone by branching and transmitting the output of the oscillator to the receiver. However, in a button telephone device, for example, when a dial operation is performed on the telephone, dial information is sent from the telephone in the form of data to the main device, and the dial sender of the main device sends a dial signal to the central office line based on the above data. (so-called sender method).

In the telephone exchange system using the sender method described above, a key-in tone generator is required because the dial signal cannot be used as it is as a key-in tone.

In conventional key telephone devices, each telephone has a key-in tone generator, and the key-in tone is transmitted from the dialed telephone to the handset.

[Problem that the invention seeks to solve]

According to the above-mentioned conventional technology, a key-in-tone generator is required for each telephone, which does not make the system expensive;
Since the transmission of dial information and the transmission of key-in tones are performed separately and independently, a failure may occur in which only either dial information or key-in tone is transmitted.

Such failures cause erroneous connections or disconnections.The present invention is proposed to solve the above problems.

[Failure to solve the problem]

In order to solve the above problems, the present invention provides a key-in-tone generator in the main device, and controls a call path switch when the main device receives dial information sent by dialing on a telephone. connects the telephone and the key-in-tone generator to send a key-in tone to the telephone, and if there is a communication path connected to the telephone at this time, the communication path and the telephone are connected while the key-in-tone is being sent. The connection path to the communication path is opened to prevent key-in tones from being sent through the communication path.

[Embodiments of the invention]

The drawing is a block diagram showing related parts when the present invention is implemented in a button telephone device.As shown in the drawing, in the button telephone device according to the embodiment, a communication path switch (hereinafter referred to as a switch) of the main device ME is used. ) 1 is connected to the horizontal telephone and the telephone line of the office line trunk 2, and the output line of the key-in tone generator 3, and the output line of the dial sender 4 is directly connected to the office line trunk 2. Further, the horizontal telephone, switch 1, office line trunk 2, key-in tone generator 3, and dial sender 4 are each connected to the central processing unit 5 through control lines.

When the telephone K is placed horizontally and the central processing unit 5 presses the central line selection button of the telephone device to make a call to the central office line CO, the central processing unit 5 reads the central line selection information from the horizontal telephone and seizes the central line trunk 2. Control switch 1 to set cross point P
I.

Close P. Since the central office line trunk 2 has been captured, a closed loop is formed with respect to the central office line Co, and the central office line is in a state of transmission. This is K, υ A dial tone is sent from the central office line CO, and the dial tone is the cross point of central office line trunk 2 and switch 1)
It is transmitted to the phone horizontally via Pt and P□. When the telephone placed horizontally makes a call to the central office line CO in this way, a communication path is formed between the telephone and the central office line CO before dialing.

Here, when dialing is performed with the phone placed horizontally, the dialing information sent from the horizontally placed phone is read into the central processing unit 5 via the control line, and when the central processing unit 5 reads the dialing information, it controls the switch 1. cross point P
, , P.

At the same time, at least one of the cross points P, . The key-in tone output from the key-in tone generator 3 is sent to the cross point of the switch 1 and to the horizontal telephone position via P3.

At this time, the cross points P, , P of switch 1.

Since at least one of the lines is open, the key-in tone will not be sent to the office line CO (office line trunk 2) via the cross points P, , P, , P□, P.

The above operations are performed every time the dial button is pressed when the phone is placed horizontally.

When the central processing unit 5 reads the dial information, it controls the office line trunk 2, connects the dial sender 4 to the office line trunk 2, activates the dial sender 4, translates the dial information into a dial signal, and executes the above-mentioned The dial signal is sent from the dial sender 4 to the office line CO via the office line trunk 2.

The above-mentioned operations are similarly performed in dialing operations performed after the communication path between the telephone set and the called party is completed. Such dialing operations include, for example, dialing operations in end-to-end communication (communication when data is exchanged between a telephone device and a database when the called party is, for example, a database).

Also, in cases where the telephone does not have a central office line button, such as a private branch exchange, and the central office line is captured using a cable, when dialing the central office line identification dial (usually #0'' dial) on the telephone, A communication path with the central office line has not yet been established.

Therefore, in such a case, control to open the communication path (control to release the cross points of the switch 1, Ps and Pa) is not required.

〔Effect of the invention〕

As described above in detail, according to the present invention, only one key-in tone generator is required in the main device, so the system can be configured at low cost, and the key-in tone does not require dialing information to be received by the central processing unit. This has the effect of reducing erroneous connections or disconnections due to erroneous dialing because the limit is not sent.

[Brief explanation of the drawing]

The drawing is a block diagram of an embodiment of the invention. (Main symbols) ME...Main equipment Location...Telephone 1...Switch 3...Key-in tone generator.

Claims (1)

[Claims] A key-in-tone generator is provided in the main device, the output line of the key-in-tone generator is housed in a call path switch, and each time a dial operation is performed on the telephone, the telephone and the key-in-tone generator are connected by the call path switch. and transmits a key-in tone to the telephone, and if there is a call path connected to the telephone, the call path switch connects the telephone to the telephone while the telephone and the key-in tone generator are connected. A key-in-tone transmission method that opens the communication path that is currently being used.