JPS644717B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a button telephone device in which various telephone terminals such as a loudspeaker telephone are housed in the device, functions possessed by the telephone terminal and functions possessed by the button telephone device are combined, and the functions possessed by the button telephone device are combined. The present invention relates to a terminal adapter system for operating various telephone terminals as terminals within a button telephone device.

Conventionally, when a key telephone system (KTS) or an electronic key telephone system (EKTS) accommodates various standalone telephone terminals, such as a terminal such as a loudspeaker telephone that can make calls without using a handset,
Branch connections were made on the central line side of the KTS or EKTS main equipment, that is, at the entrance of the system. Figure 1 shows a conventional connection accommodated in an EKTS. In Figure 1, 1 is a central office line group, 2 is a main unit, 3 is a button telephone, and 4
is a public address telephone. In FIG. 1, loudspeaker telephone 4 is connected to central office line #3. This configuration had the following drawbacks.

(i) If you use a public address telephone without knowing it while a key telephone is talking on central line #3, it will interrupt the call. Furthermore, if both parties are dialing or talking, there will be a collision of calls and connection will be impossible.

(ii) A loudspeaker telephone does not have the functions of a button telephone (line holding, extension calling, transfer), and for example, when calling a key telephone of another extension, a connection procedure via a central office is required.

In addition, as a method to improve these drawbacks, for example, a button telephone with a loudspeaker function may be constructed, but in this case, there are the following drawbacks.

(iii) There are several types of button telephones in a single system depending on the line scale of the system (for example, in the Nippon Telegraph and Telephone Public Corporation system, there are three types: 206 type, 410 type, and 620 type). A 206-type, 410-type, or 620-type key telephone with a public address function is required. Therefore, for other telephone terminals, it is necessary to prepare button telephones with functions corresponding to the size and type, which is very disadvantageous in terms of productivity, cost, operation, and management of telephone terminals.

Further, there is a method shown in FIG. 2 as a method for solving the problems (i) to (iii) mentioned above. This is a system in EKTS, and the loudspeaker telephone 4 is accommodated in the system via the telephone interface circuit TIF5.
This TIF5 includes a DC power supply circuit (unnecessary if the main unit's communication path switch is directly connected to a local power supply such as a relay or high-voltage PNPN switch), a bell signal (16Hz) generation circuit, a hook state detection circuit, It consists of a dial signal receiving circuit. When a call is received from the central office line, a bell signal is sent from the bell signal generating circuit to the public address telephone 4, and the bell rings. (in this case,
(It is difficult to identify the receiving station line), if you create a loop with the loudspeaker telephone and answer, the loop detection circuit will detect the terminal status, and if you specify the station line using the dial number from the telephone 4, the dial signal receiving circuit (DP or PB) will specify the terminal status. The office line is identified, and the terminating office line can be captured from the public address telephone 4. Further, even when selecting an arbitrary office line from a public address telephone to make a call, the office line is selected using the dial number in exactly the same manner. In addition, even when placing a call on a central office line on hold, by dialing a special number in the same manner, the dial receiving circuit is operated and the holding operation is performed. According to this method, the drawbacks (i) to (iii) above can be eliminated when various types of telephone terminals are housed in a button telephone device, but (i) the disadvantages such as central line selection and hold, which are normally used in a button telephone device, can be eliminated; All functions that used to be performed with a single touch of a button are now operated using a special number dial, which is extremely troublesome.

(ii) Dial receiving circuits (particularly for PB signals) are expensive, and while in large systems that accommodate a large number of various telephone terminals or EPBXs, the relative cost can be reduced by common use, it is an economical problem in small systems. There is.

In order to solve these drawbacks, the present invention provides a line status display lamp, a line selection button,
By using a terminal adapter with functions and configurations such as a ringer, and connecting various telephone terminals to a button telephone device (main device) in the same way as a button telephone, various telephone terminals can be restored to their original functions. It is characterized by having the functions of a button telephone, and will be explained in detail below with reference to the drawings.

Figure 3 shows an embodiment of the present invention in a star wiring type EKTS, in which 1 is a station line, 6 is a station arrival detection circuit, 7 is a main device control circuit, 8 is a telephone terminal adapter, and 9 is a terminal terminal. Control circuit (1 to n: button telephone, 0: terminal adapter), 10 is a central office line lamp that indicates the usage status of the central office line, 11 is a ringer that notifies incoming calls by sound, 12 is a central office line button that selects a central office line,
13 is an extension line connecting the main device 2, key telephone 3 and terminal adapter 8, 14 is a communication line switch that connects the office line and the extension line, 15 is a loop detection circuit built into the terminal adapter, and 16 is the main device. 2, 17 is the switch for the telephone terminal 4, 20 is the DP (dial pulse) center that sends a dial signal to the central office line, 21 is the hold button, and 22 is the button for putting the busy central office line on hold. The hold circuit 23 is a call button for calling an extension telephone.

Next, these operations will be shown. First, an example of receiving a call from a central office line will be shown. When there is an arrival of a bell signal from the office line #1, the arrival detection circuit 6 detects this and transmits the information to the control circuit 7.
Based on this information, the control circuit 7 controls the button telephone 3 ₁ ,
3 ₂ , ......, 3 _o Specify the incoming station line and the station line status to the terminal adapter 8 (in this case, the station terminating status)
Send out information. In each button telephone and terminal adapter, the control circuit 9 ₀ receives this, drives the corresponding office line lamp 10 ₀ , flashes the incoming call status display, and at the same time rings the ringer 11 ₀ .
In this state, in order to make a central office line call from the telephone terminal 4, the handset must be placed in an off-hook mode or in another loop forming mode, and the loop detection circuit 15
Detect with. When the station line button 12 is pressed at the same time, this information is sent to the control circuit 7 of the main device 2 via the control circuit 9. The control circuit 7 connects the office line and the extension line 13 by driving the communication path switch 14 . At the same time, the control circuit 7 controls each button telephone 3 ₁ , 3 ₂ , ......, 3 _o
The control circuit 9 of each button telephone changes the station line lamp 10 to a busy status display (steady lighting) and stops the ringer 11 from ringing. . Through this operation, the telephone terminal 4 can make a central office line call in the same way as other key telephones 3. Also, when viewed from other key telephones, the telephone terminal 4 connected via the terminal adapter 8 has the same functions and operations as the key telephone. When the call ends and the telephone terminal 4 is turned on or the loop is disconnected to end the call, the loop detection circuit 15 detects this and the information is sent to the control circuit 7 of the main device 2 via the control circuit 9. The communication path switch 14 is disconnected, and the control circuit 7 sends signals to each button telephone 3 ₁ , 3 ₂ , . . .
. . . , 3 _o , transmits the end-of-call information to the control circuit 9 of the terminal adapter 8, turns off the office line lamp 10, and displays the idle state of the office line. Note that the loop detection circuit 15 for detecting on-hook of the telephone terminal 4 or disconnection of the loop of the central office line indicating a call termination state is connected to the extension 13 side (16 in FIG. 3) of the communication path switch 14 of the main device 2.
It's okay to be there. This loop detection circuit 15/16
Since there is a need to detect information on the user's switch operation even without direct current applied from the central office exchange, the function can be realized with a configuration as shown in FIG. 4, as an example.

FIG. 4 shows the configuration when installed in the main device 2, and 24 is the communication circuit of the telephone terminal 4 and the loop detection element 2 when there is no central line loop or is not formed.
The loop detection element 25 is a power supply that applies a DC voltage to the loop detection element 25, and the loop detection element 25 can be constructed from a photo coupler or the like. Reference numeral 26 denotes a switching element such as a relay that is driven by information on pressing the office line button, and switches between the office line and the power source 24. This circuit can detect the switch state during internal line intercommunication and central office line communication.

Next, the operation of making a central office line call from the telephone terminal 4 will be described. When the telephone terminal 4 is placed in an off-hook or talking state, furthermore, when the office line lamp 10 is turned off and the office line is in an idle state, and the office line button 12 corresponding to the office line button 12 is pressed, that information is controlled. It is transmitted to the control circuit 7 of the main device 2 via the circuit 9. The control circuit 7 connects the extension line 13 from the telephone terminal 4 and the central office line 1 specified by the central office line button 12 through the communication path switch 14, and also sends the information that the central office line is busy to the control circuit 9 of each button telephone 3. The station line lamp 10 changes to a busy display. In this state, a dial tone is returned from the central office exchange to the telephone terminal 4.
It is now possible to make dial calls. If the call path switch 14 is a directly connected element such as a relay or a high-voltage PNPN switch, a selection signal from a dial signal transmission circuit (DP or PB) built into the telephone terminal 4 is sent directly to the central office exchange. . Through these operations, it becomes possible to select a central office line and make a dial call from the telephone terminal 4 via the terminal adapter in exactly the same way as a normal key telephone. The operation when a call ends is the same as the operation when a call is received.

Next, we will discuss hold and transfer. Telephone terminal 4
However, when the hold button ₂₁₀ is pressed during a call to the central office line via the terminal adapter 8, the information is transferred to the control circuit 7 of the main device 2 via the control circuit 9, and the hold circuit is activated based on this information. 22 to put the central office line on hold. Next, when one of the extension call buttons ₂₃₀ of the terminal adapter 8 is pressed, the button corresponding to the extension telephone to be called is pressed, and this information is transmitted to the control circuit 7 of the main device 2 in the same way as in other cases, and the control circuit 7 This information is sent as a signal to the control circuit 9 of the corresponding extension button telephone 3 _n . The called button telephone _3n makes a ringer ring and displays an extension call in the same manner as in the case of an incoming call from a central office line. If you go off-hook with the called button telephone _3n , you can talk to the calling party. In this state, if the calling party informs the called party that the station line on hold will be captured and the called party presses the station line button on hold, the called party will be able to communicate with the station line.
Hold and transfer completed.

Although the above explanation of the operation has been given for the case of a star wiring type electronic button telephone device, it goes without saying that it can be applied to a multi-wiring type button telephone device and an electronic button telephone device.

As mentioned above, by using a terminal adapter, various types of telephone terminals that were conventionally branch-connected on the central office line side can be housed in a button telephone device, and the original functions of the telephone terminal (for example, loudspeaker telephone, telephone fax) can be accommodated. etc.) and functions as a button telephone device to form a comprehensive button telephone system.

[Brief explanation of drawings]

Fig. 1 shows a conventional method for connecting telephone terminals in an EKTS, Fig. 2 shows a conventional method for accommodating telephone terminals in an EKTS, and Fig. 3 is a block diagram showing an embodiment of the present invention.
FIG. 4 shows an example of the configuration of a loop detection circuit according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Station line group, 2... Main device, 3... Key telephone, 4... Loudspeaker telephone, 5... Telephone interface circuit, 6... Station arrival detection circuit, 7... Control circuit, 8... Telephone terminal adapter, 9...control circuit,
10... Central line lamp, 11... Ringer, 12...
... Office line button, 13 ... Extension, 14 ... Call path switch, 15, 16 ... Loop detection circuit.

Claims (1)

[Claims] 1. A button telephone device is provided with means equivalent to each means of a button telephone, that is, a line status display means, a line selection means, an extension calling means, etc., and the state of a connected telephone terminal is provided. A terminal adapter equipped with a detection means for detecting is provided, and the telephone terminal having an interface function equivalent to that of a telephone is connected to the terminal adapter, thereby combining the functions of the telephone terminal and the functions of the button telephone device. A terminal adapter method that is characterized by: 2. The terminal adapter system according to claim 1, characterized in that the detection means is provided in the main device of a key telephone device instead of being provided in the terminal adapter.