JPH0777460B2 - On-premises radio calling method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a private branch exchange, and more particularly to a private branch call system in a private branch call service.

[Prior Art] Conventionally, when providing a private radio paging service using a private branch exchange, a private radio paging device including a private radio paging transmitter is configured as a device completely different from the private branch exchange. Then, the call signal to the local wireless calling device is transmitted and received in the form of dial pulse or PB signal used in the telephone interface, and this calling signal is converted into a modulated signal by the wireless calling transmitter and transmitted. It has become.

[Problems to be solved by the invention]

By the way, when it is necessary to install a plurality of transmitters on the premises (for example, when a plurality of transmitters are required due to problems such as radio wave propagation in the premises), each transmitter is equipped with a signal conversion circuit. In other words, installing a plurality of transmitters with a built-in signal conversion circuit raises the cost.

[Means for solving problems]

According to the present invention, in a private branch exchange comprising a switch network and a control circuit for controlling the switch network,
A plurality of local radio paging transmitters connected to the switch network, and a paging signal generating circuit connected to the switch network for generating a paging signal input as a modulation signal of the local radio paging transmitter, When making a radio call, the control circuit provides a call signal as a modulation input to a preselected radio transmitter for a local radio call through a switch circuit network, thereby obtaining a local radio call system.

〔Example〕

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

The drawing is a relay system diagram of a private branch exchange to which a private radio paging system of the present invention is applied. Referring to the drawing, the office line trunk circuit 1, the transmitter interface circuits 3 and 4, the ringing signal generation circuit 7, and the subscriber interface circuit 8 are connected to a switch network 2 and controlled by a control circuit 10. Transmitters 5 and 6 are connected to the transmitter interface circuits 3 and 4, respectively, and receive a calling signal output from the calling signal generation circuit 7 through the switch network 2.
While relaying it to the transmitters 5 and 6, it functions as an on / off (ON / OFF) control of the transmitter according to a command from the control circuit 10 and as an interface for passing the status information of the transmitter to the control circuit 10. A telephone 9 is connected to the subscriber interface circuit 8.

For example, when the subscriber of the telephone 9 leaves the seat and goes to the area of the transmitter 5, if the absent transfer destination is registered in the transmitter 5 by the operation of the telephone, if the subscriber receives a call ( When the telephone 9 receives an incoming call), the control circuit 10 controls the switch network 2 to connect the path between the call signal generation circuit 7 and the transmitter interface circuit 3. Then, the control circuit 10 controls the calling signal generation circuit 7 to output the calling signal of the telephone 9 and turns on the transmitter to perform the calling operation.

In this way, the control circuit 10 sends a call signal through the switch network 2 to the preselected (preregistered) transmitter at the time of wireless call (that is, when there is an incoming call to the telephone set which is absent). The calling signal from the generation circuit 7 is given as a modulation input.

〔The invention's effect〕

As described above, according to the present invention, the radio paging transmitter and the paging signal generating circuit are connected through the switch circuit network. Therefore, when a plurality of transmitters are required, a signal conversion circuit is provided for each transmitter. Since it is not necessary, it is possible to provide a cheaper in-house radio paging service than before. In addition, if the transmitter uses a signal format that uses a modulation signal in the voice band that can be modulated and transmitted, wireless call terminals that use different signaling methods will also generate a call signal with a modulated signal of each signal format. A call signal generation circuit that can be used, for example, if two types of signal call radio call terminals are to be serviced, by installing two types of call signal generation circuits, they can be easily accommodated in the same system.

[Brief description of drawings]

The drawing is a relay system diagram of a private branch exchange to which a private radio paging system of the present invention is applied. 1 ... Station line trunk circuit, 2 ... Switch network, 3 ... Transmitter interface circuit, 4 ... Transmitter interface circuit, 5 ... Radio call transmitter, 6 ... Radio call transmitter, 7 ...... Call signal generation circuit, 8 ...... Subscriber interface circuit, 9 ...... Telephone, 10 ...... Control circuit.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04Q 7/12 7/38

Claims (1)

[Claims] 1. A private branch exchange comprising a switch network and a control circuit for controlling the switch network, wherein a plurality of private branch call paging transmitters connected to the switch network are connected to the switch network. And a ringing signal generating circuit for generating a ringing signal which is inputted as a modulation signal of the local radio ringing transmitter, and the control circuit uses the ringing signal as a modulation input through the switch network at the time of wireless ringing. An on-premise radio calling system characterized in that it is given to the preselected radio transmitter for on-premise radio calling.