JPH037309B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital private electronic branch exchange that takes into account the functions of conference calls and simultaneous paging.

Figure 1 shows a conference call in a crossbar private branch exchange (hereinafter referred to as "PBX").
FIG. 3 is a diagram for explaining service functions such as simultaneous paging.

In a crossbar type PBX, an extension that adds conference calls and simultaneous paging services, in this example, extension subscriber 1-
Telephones 1-1~ only for 1, 1-2, 1-n
Conference trunks 3-1 to 3-n were provided between line circuits 1-n and line circuits 2-1 to 2-B.

When providing services such as conference calls and simultaneous paging to the above extension subscribers, the switching circuits of the conference trunks 3-1 to 3-n are switched to the conference phone trunk 4 by operating the telephone keys on the conference phone console 6, and the conference trunks are simultaneously connected. Calling and simultaneous calls were realized by control of a conference telephone operation console 6 and a conference telephone control circuit 5. In the case of the crossbar system, the amount of hardware in the conference trunks 3-1 to 3-n, the conference phone trunk 4, the conference phone control circuit 5, and the conference phone operation console 6 is approximately 1/10 to 1/1/2 of the entire exchange.
It was adopted because it has a special function.

When attempting to adopt the crossbar type conference telephone and all-at-once calling functions shown in Figure 1 to a digital electronic exchange, the total amount of hardware in the digital electronic exchange is extremely small. It is expected that the hardware related to the calling function will be reduced to 1/4 to 1/2 depending on the number of conference phone subscribers, and it is easy to use an analog circuit to simultaneously call a large number of subscribers (equivalent to a conference phone trunk). , is difficult to achieve using only digital signals.

Therefore, at present, only the crossbar type conference telephone system, the simultaneous paging system, etc. have been adopted, and these have not been implemented in digital electronic exchanges for the above-mentioned reasons.

An object of the present invention is to solve the above-mentioned drawbacks, and by providing an analog-to-digital conversion circuit, service functions such as conference calls and simultaneous paging of digital PBX exchanges can be improved more than those of the crossbar system.
It is an object of the present invention to provide a conference telephone system for a digital private branch exchange that can be easily realized with the above-mentioned functions and requires a minimum amount of hardware.

In order to achieve the above object, the conference telephone system according to the present invention secures a plurality of connection terminals in the digital network, and also includes an AD converter, a DA converter, and a 4-wire circuit consisting of the AD converter and the DA converter. an AD/DA converter comprising a plurality of circuits each comprising a 2-wire to 4-wire conversion circuit for converting into a 2-wire circuit; and an analog synthesis section for composing the 2-wire side of the plurality of 2-wire to 4-wire conversion circuits. A plurality of circuits of the conference telephone circuit are respectively connected to a plurality of connection terminals of the digital network, and the digital premises are connected according to the control of one extension subscriber or the operation of the operation console. The system is configured so that conference calls and simultaneous paging of a predetermined number of extension subscribers can be made by controlling the exchange.

According to the above configuration, the object of the present invention is completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings. FIG. 2 is a circuit diagram showing an embodiment of the conference telephone system according to the present invention. In the figure, 11-
1, 11-2 to 11-n are digital PBX subscriber telephones, 12-1, 12-2 to 12-n are digital PBX line circuits corresponding to each subscriber telephone,
13 is an n-line conference telephone circuit, 14 is a tape circuit, 15 is a conference telephone console, and 16 is a digital network. The n-line conference telephone circuit 13 is accommodated in n general telephone connection terminals of the digital network 16.

FIG. 3 is a detailed diagram of an n-line conference telephone circuit. This circuit is composed of an analog synthesis section 17 and an AD/DA conversion section 18. In the AD/DA, the conversion section 18 has n identical circuits, and each circuit is composed of an analog/digital conversion section, a digital/analog conversion section, and a hybrid circuit.
The AD/DA converter 18 has functions of mutually converting analog signals and digital signals and a 2-wire/4-wire conversion circuit function. The analog synthesis section 17 is a circuit that synthesizes analog signals from the n circuit and the tape circuit 14 and sends them to each circuit at the same time. For example, the analog signal that has been digital/analog converted and sent to the analog synthesis section from the n-th circuit is sent to other circuits as shown in A.

When this circuit is connected to n telephones 11-1 to 11-n via the digital network 16, simultaneous telephone calls can be made between the n telephones.
In FIG. 2, the conference telephone operation console includes individual calling keys for subscriber telephones 11-1 to 11-n, telephone keys for simultaneously calling subscriber telephones 11-1 to 11-n, hold keys for other subscriber telephones, and disconnection keys. This is an operation console equipped with an electric key for various services such as an electric key, and a numeric display element.

In accordance with the key operation on the operation console 15, the general extension telephones 11-1 to 11-n are called individually or all at once and connected to the conference telephone circuit 13 by the software control of the PBX exchange, and if necessary, the subscribers at the operation console are called. By also connecting the circuit, it is possible to make simultaneous calls using the subscriber telephones 11-1 to 11-n together with the operator's voice guidance.

Figure 2 Digital network 16 from 0 to
n, CFBD is a connection path between the n-line conference telephone circuit 13, the subscriber telephones 11-1 to 11-n, and the conference telephone console 15, and the formation of this connection path is no different from exchange connection software control. Easy to form.

In this way, conference phone circuit (multiple simultaneous call circuit)
By simply installing the system in the digital electronic exchange, conference calls and simultaneous calls can be made by controlling the digital electronic exchange's hardware and software.

The present invention provides conference call class,
It is also easy to use hidden extension numbers for conference calls as exchange software control data, and to control one extension to enable conference calls, simultaneous calls, etc.

As explained above in detail, the present invention
A conference telephone circuit consisting of a DA conversion circuit and an analog synthesis section is installed, which doubles as the subscriber circuit function of a regular telephone, and provides service functions such as conference calls and simultaneous paging to a digital PBX electronic exchange with a minimum amount of hardware. It has been made possible.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a crossbar type PBX conference telephone system, FIG. 2 is a diagram showing an embodiment of the conference telephone system according to the present invention, and FIG. 3 is a detailed diagram of the conference telephone circuit of FIG. 2. 1... General telephone (TELA), 1-1, 1-2
~1-n...Conference telephone, all subscriber with simultaneous calling function,
2... General telephone line circuit (LCA), 2-1,
2-2 to 2-n...line circuit (LCo to LCn),
2-B...Conference telephone console line circuit (LCB),
3-1, 3-2 to 3-n...Conference trunk (CFTo to CFTn), 4...Conference telephone trunk (CFT), 5...Control circuit (CFTC), 6...Conference telephone operation board (CFBD) , 7...Network, 1
1-1, 11-2 to 11-n... General telephone (TELo to TELn), 12-1, 12-2 to 12-
n...Digital PBX line circuit (LCo~
LCn), 13... n-line conference telephone circuit (CFT),
14...tape circuit, 15...conference call console (CFBD), 16...digital network (NW), 17...analog synthesis section, 18...
AD/DA conversion section.

Claims (1)

[Claims] 1. A 2-wire to 4-wire conversion circuit that secures a plurality of connection terminals in a digital network and converts a 4-wire circuit consisting of an AD conversion section, a DA conversion section, and the AD conversion section and the DA conversion section into a 2-wire circuit. an AD/DA conversion section comprising a plurality of circuits,
A conference telephone circuit including an analog synthesis section for synthesizing the 2-wire side of the plurality of 2-wire to 4-wire conversion circuits is provided, and the plurality of circuits of the conference telephone circuit are connected to a plurality of connection terminals of the digital network. The system is configured such that conference calls and simultaneous paging of a predetermined number of extension subscribers can be made by connecting each extension subscriber to a digital private branch exchange and controlling the digital private branch exchange according to the control of one extension subscriber or the operation of the console. A digital private branch exchange conference telephone system featuring the following features: