JPS58106987A - Key telephone device - Google Patents

Abstract

PURPOSE:To adapt the signal transmitting system to the time division controlling system, by providing a holding key independent of an interlocking key for line selection and a relay contact which forms a holding loop temporarily together with the contact of said interlocking key. CONSTITUTION:In a telephone set 2, a line selecting key 9 and a hook switch 12 are closed and a service circuit 13 is connected to a trunk line 3 during the service to the trunk line 3. An LED 14 is lit continuously. When a holding key 15 is depressed, a holding relay 16 is driven, and its contact is operated to form a holding loop temporarily. Simultaneously, a holding signal is sent to a controlling circuit 18 through a controlling circuit 17 and a control line 6 and is decoded and detected to drive a holding relay 19 through a trunk line circuit 20, and its contact 7 is operated to form a holding loop of the trunk line 3. Thereafter, the contact 10 in the telephone set 2 is released, and the LED 14 displays holding. Thus, a key telephone device suitable for adapting the signal transmitting system between the telephone set 2 and a master device 1 to the time division controlling system.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a switch distributed type (mechanical) button telephone device using an interlocking electric key.

The hold control system of conventional key telephone devices uses a hold TM linked to line selection 111- on each telephone.

In other words, when the hold phone key is pressed and released, the line selection phone key that was being pressed is restored at the same time.

The line hold operation is as follows. First, when you press the hold key, a hold signal is sent to the main device, and the hold relay in the main device operates to form a (b) line hold loop.
When the kL- is closed, the line selection power is restored at the same time, and the hold operation is completed. At this time, hold 111: Line selection 1 after the key is pressed! The time it takes for the trowel to cool down depends on the operator's construction, and is generally considered to be between 50 and 500 milliseconds.

Therefore, in the conventional system, it was not possible to adopt a time division control system for signal transmission between the telephone and the main device. In other words, in the time-sharing control method, it takes a certain amount of time (one cycle) from when the hold key is pressed until the hold signal is transmitted to the main device. If the operator performs a quick hold operation, there is a risk that the line selection key on the telephone will be restored before the hold relay in the main device operates and a hold loop is formed, resulting in a temporary disconnection of the line.

SUMMARY OF THE INVENTION An object of the present invention is to provide a button telephone device using a nine-switch distribution method using an interlocking key for line selection, in which the signal transmission method between the telephone and the main device is a time division control method. It is.

The present invention operates a holding telephone key independent of the line selection interlocking key and when the holding key is pressed during a call, and temporarily creates a holding loop together with the contacts of the line selection telephone key that is being pressed. It is a button telephone device that has a relay contact that forms a part.

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a button telephone device according to the present invention that employs a switch distribution type and a time division control method (line + extension) x 2
Book, time sharing control #! 5 and 6 use two each. The communication H"is control line 5 and 6 are connected in parallel to all telephones. The main device 1 sends control line #5 to each telephone 2.
Lamp information for each line is provided through ! 4 Information, etc. is transmitted in a time-sharing manner. Further, through the control line 6, signals such as calling, answering, and holding calls from each telephone are received in a time-division manner for each call. The signal transmission rate #i on control lines 5 and 6 is several hundred bits/second.

FIG. 2 shows an embodiment of the invention in more detail.

Reference numbers 1 to 6 correspond to FIG. However, the communication line 4 representatively shows only one station line of the line 1, and the control circuit 17 receives and decodes the signal from the main device 1, controls the lamp lighting, ring tone display, etc. , detects the operation of the hook switch and assembles it into a time-sharing signal [1
Send to. The control circuit 18 receives and decodes signals from the office line circuit 20 and each telephone, and assembles and sends the lamp signal 1 incoming signal etc. into a time division signal to each telephone, and also sends a hold signal etc. to the office line circuit 20.

Next, the holding operation of this device will be explained. While talking to a central office line using telephone 2, press line selection key 9 and hook switch 12.
is closed, and the communication circuit 13 is connected to the central office line. Also L
ED14 is lit continuously. When the hold key 15 is pressed, the hold relay 16 is activated, and its contact 10 operates to temporarily create a hold loop (even if the hold key 15 is released, the hold relay 16 is not activated).
Fi, not restored), and at the same time a hold signal is sent to the control circuit 17,
The signal is sent to the control circuit 18 through the control 1i16, decoded and detected, and the hold rerecorder 19 is driven through the office line circuit 20, and its contact 7 is operated to create a hold loop for the office line.

After this, the contact point 10 inside the telephone is restored, and the LED 14 displays a hold indication.

The re-answer operation for the held line is as follows. When you perform a re-answer operation on phone l12, hook switch 2
1 and @ line selection key 9 are closed, the information is transmitted to the office line circuit 20 through the same route as when on hold, the hold relay 19 is restored, and then the call state is entered.

The present invention has the effect of making it possible to employ a time division control method in a key telephone device that uses an interlocking key for line selection.

[Brief explanation of the drawing]

1 and 2 are block diagrams showing an embodiment of the present invention. 1... Main device, 2... Telephones connected in parallel, 3... Office line, 4... Office line or extension telephone line, 5° 6... Time division control line, 7.
...Holding relay contact, 8...Holding resistor, 9... Line selection key, 10°°°°°. Relay contact that operates temporarily when on hold, 11...
Resistance, 12...Hook switch, 13...
...Call circuit, 14...Line compatible status display L
ED, 15...... Holding telephone key independent of the interlocking electric key, 16... Holding relay, 17... Control circuit, 18... Control circuit, 19. ...Holding relay, 20...Station line circuit, 21...
・Hook switch.

Claims (1)

[Claims] In a switch-distributed button telephone device that uses an interlocking telephone key for recursive selection on each telephone, a non-look type holding telephone key is provided independent of the interlocking telephone key, and the holding key is pressed on the outer edge during a call. When a relay installed inside the telephone is activated, a temporary hold circuit is formed between the contacts of the relay and the contacts of the line selection telephone key that are pressed, and the hold signal from the telephone activates the relay inside the main unit. A key telephone device characterized in that after a holding relay provided in the telephone operates to form a holding circuit for the (B) line, the relay in the telephone is restored and performs a holding operation for an outside line.