JPS584876B2 - Control method of central line reception telephone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information transfer method in a distributed relay type private branch exchange, and in particular, to a control system for transferring the status of a call originating from a central line reception telephone or a central line response to a common control device. Regarding the method.

In a common control type automatic private branch exchange, a common control device (
marker) is required to identify the extension status information during connection control.

This information includes idle/busy information on the extension telephone, class information, and other special information from a specific small number of extensions, such as button responses on the office line reception telephone, tenants, and outgoing calls from public telephone extensions.

In a private branch exchange using a distributed trunk system, a small number of central line receiving telephones are distributed throughout the premises. It looks like this.

When answering an incoming call from a central office line, press the button on the receiving telephone and pick up the handset, or pick up the handset without pressing the button to make a normal outgoing call.

Therefore, the common control device (marker) of the exchange needs to identify whether or not a button is pressed when the calling extension is a central reception telephone.

In other words, if the button is pressed, one identification relay (relay BTA as described later) will operate at the marker, and if the button is not pressed in the normal state, it will be connected to the calling register, but the station that received the call from the central office line will be connected. Change the control to connect to the line trunk and answer the central office line with this extension telephone.

The circuit for identifying information about the button pressed must be configured so that a central office reception telephone can be accommodated in any extension.

Therefore, in the past, in contrast, an extra set of contact deployment circuits similar to the extension class identification circuit was provided, and the information when the button was pressed from the central office line receiving telephone was transmitted to the corresponding central office line of the contact deployment circuit. This was applied to the output terminal corresponding to the reception telephone, thereby causing the marker to operate one identification relay (relay BTA described above), and this status information was transferred to the common control device (marker).

However, although the central office line reception telephone can be accommodated in any extension, there is no type of phone that can be accommodated in all extensions at the same time, and at most, the number of telephones that can be accommodated is about 10% of all extensions.

Therefore, more than 90% of the output terminals of the above-mentioned contact development circuit are not used, resulting in poor usage rate and a lot of waste.
It is uneconomical.

In view of the above, the present invention identifies the class of an extension using a single contact expansion circuit having output terminals corresponding to all extensions, and also identifies whether or not the extension telephone needs to transfer status information. For those that need to transfer status information, a transfer path is constructed from the extension telephone to the common control device, with the aim of simplifying and economical control of information transfer, especially regarding central reception telephones. That is.

Next, embodiments of the present invention will be described with reference to the drawings.

The figure is a connection diagram of an example in which the present invention is implemented in a distributed relay stand type common control type automatic private branch exchange.

In the figure, EXT is a central line reception telephone equipped with push button K, B
TA indicates a push button addition device, LF indicates a line link, and MKR indicates a marker which is a common control device.

If you make a call in the normal way without pressing pushbutton K on the central line reception telephone EXT, the marker MKR is activated as is well known, and the next connection device such as a call register, trunk, etc. is activated via the line link LF. connected to.

In this connection control process, marker MKR
The extension accommodation position identification circuit P provided in R sends earth air to the relay M to operate it, and by closing the contact m5, the outgoing extension EXT is drawn into the accommodation position identification circuit P, and its accommodation position is identified. do.

If the accommodation position is line group 1 and horizontal file 9, the accommodation position identification circuit P selects relays LG1 and HF corresponding to this accommodation position.
9 through contacts m2 and m4, respectively, to operate these.

Then, in the relay contact expansion circuit CD for identifying the extension class, contacts lg1 and hf9-1 close, air appears at the output terminal 19 corresponding to the accommodation position of the calling extension telephone EXT, and gate relay G0 and Class identification relay CLA in marker MKR operates.

At this time, even though gate relay G0 operates, contact g0 closes, and an information transfer path is configured, contact an5 is not closed in button attachment device BTA of extension telephone EXT, so relay BTA does not operate at marker MKR. .

Therefore, marker MKR identifies that the originating extension telephone EXT is of class A and allows the connection to proceed.

Here, for other extensions, relays CLA, CLB, CLC, etc. indicating the corresponding class are jumpered to the corresponding output terminals.

Now, in order to respond to an incoming call from a central office line, it is assumed that the user first presses push button K on the central line reception telephone EXT, and then raises the handset while holding it down.

Then, relay B operates via air, button K, and by closing contact b1, relay AN operates via ground air, contact c1 (break) in line link LF, and contact b1.

By closing contacts an1 and an2, relay LP connects earth, contact an2 (make), telephone EXT, and contact an1 (
make), and then operate.

By closing contacts lp1 and an3, line circuit LRG
Create a DC loop for and activate marker MKR.

Thereafter, marker MKR identifies the housing position of telephone EXT in the same manner as described above.

Note that when the extension EXT is connected to the next connection position via the line link LF, the relay C is activated and the contact c1 is switched, so that the holding circuit of the relay AN is cut off and restored.

Gate relay G0 and class identification relay CLA operate in the same manner as described above.

This time, since contact an5 is closed in button addition device BTA, relay B
TA operates by being given earth air.

When the relay BTA operates, the control is changed so that the connection to the calling register is canceled and the connection is made from the office line to the office line trunk where the call was received.

In this way, when a call arrives on the central line, the user can immediately answer the central line by pressing button K on the central line reception telephone EXT.

In other words, information regarding the state in which push button K is pressed in central line reception telephone EXT is transferred to marker MKR as the operation of relay BTA, as described above.

It is assumed that gate relays similar to G0 are connected to other central office line receiving telephones as well.

Since the present invention is configured as described above, there is no need for a contact expansion circuit for information transfer as in the conventional case, and the number of required contacts is significantly reduced. This has the effect of providing a control system for the central office line reception telephone.

In particular, as mentioned above, the economical effect is large when the number of extensions requiring transfer of status information (pressing a button) is small.

[Brief explanation of drawings]

The drawing is a connection diagram of an embodiment of the present invention. EXT: Office line reception telephone, K: Push button, BTA: Push button addition device, LF:
・Line link, MKR・・・Marker, CD・
...Contact open circuit for class identification, G0...
Gate relay, CLA-CLC...Class identification relay.

Claims (1)

[Claims] 1. In the control of a central line reception telephone housed in a private branch exchange using a distributed relay stand system, a circuit consisting of a deployment circuit having an output terminal corresponding to all extensions and a relay for identifying the class of the extension connected to the output terminal. Equipped with an extension class identification circuit,
A gate relay is provided together with the class identification relay at the output terminal of the class identification circuit corresponding to the office line reception telephone to which status information needs to be transferred, and the operation of the gate relay causes the transmission of the office line reception telephone. A transfer path for the above-mentioned state information is configured from the terminal to the common control device, and the common control device receives the information input through the transfer path formed by the operation of the gate relay, A control system for a reception telephone on a central office line, characterized in that the telephone is controlled by identifying whether the reception telephone is responding to an incoming call or making an outgoing call.