JPH06350742A - No-ringing communication system for multiple dwelling house - Google Patents

Abstract

PURPOSE:To provide a no-ringing communication system for multiple dwelling house which reduces a PB reception circuit from a terminal side network controller and makes possible continuous meter-reading or telephone control with the low-cost network terminal side network controller. CONSTITUTION:No-ringing calling is performed to a terminal connected to the extension line of a private branch exchange 34 installed inside a multiple dwelling house 30. In this case, the private branch exchange 34 performs, no- ringing calling to the extension line designated by a center equipment 31 corresponding to an FSK (frequency modulated) signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for an apartment house for automatic meter reading and telephone control of gas, water, etc. by no ringing communication from a general subscriber telephone line to the extension of a private branch exchange (hereinafter referred to as "PBX") of the apartment house. The present invention relates to a no-ringing communication system, and more particularly to a no-ringing communication system used when making a no-ringing call for an extension designated by a calling side.

[0002]

2. Description of the Related Art Conventionally, when a ringing call for an extension designated by a calling side is made to a terminal connected to an extension of a PBX such as an apartment house, the PBX and the terminal connected to the extension are connected to each other. , PB signal (a signal generated when the push button is pressed).

[0003]

Therefore, as shown in FIG. 5, in the conventional system, the terminal side network control unit (NCU) is used.
In addition to FSK modem 101 and PB transmission circuit 102, PB
The receiving circuit 103 is required, and there is a drawback that the cost becomes higher accordingly.

An object of the present invention is to provide a no-ringing communication system for a housing complex in which the PB receiving circuit 103 on the terminal side is deleted and continuous meter reading and telephone control can be performed by a low cost terminal side network control device.

[0005]

In order to achieve such an object, according to the present invention, when a no ringing call is made to a terminal connected to the extension of the PBX, the PBX is used.
Makes a no ringing call to the extension specified by the FSK (Frequency Modulation) signal.

[0006]

When making a no-ringing call to the extension designated by the calling side, the PBX makes a no-ringing call to the connected extension with the FSK signal. As a result, communication is performed between the calling side and the terminal that has called the no ringing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a block diagram of the system of the present invention.
Is a central office side telephone station, 33 is a housing station 30 side telephone station, 34 is a PBX capable of making no ringing call to an extension, 35A and 35B are terminal side network control devices corresponding to no ringing call, and 36, respectively. Is a device such as a gas meter, a security device, and a telephone control device, and 37 is a telephone. In the figure, the device 36 and the telephone 37 are connected only to the terminal network controller 35A, but the above-mentioned devices and telephones are similarly connected to the terminal side network controller 35B.

FIG. 2 is a block diagram showing the terminal side network control unit 35A, to which the equipment 36, the telephone 37 and the extension 112 connecting to the PBX 34 are connected. Terminal side network control device 35A
Has a main controller 106 at its center,
It controls to operate according to a predetermined procedure such as transmission and reception of various information and monitoring of the usage status of the telephone 37. 101 is an FSK modem and 102 is a P
It is a B transmission circuit. In this embodiment, the PB receiving circuit provided in the conventional example is deleted. Reference numeral 104 is a line side circuit, 105 is a connection switching / telephone monitoring circuit, 107 is an interface, 108 is a power supply circuit, 1
09 is a memory, 110 is a line switch, 111
Is a reset circuit.

Now, referring to FIG. 1, the PB of the housing complex 30
When performing gas meter reading or the like at the place where X34 is installed, the telephone number of PBX34 is dialed from the center device 31. As a result, PBX34 is the telephone station 3
The call comes in with the usual 16 Hz ringing signal from 3. After this incoming call, the PBX 34 sends an ACK1 signal to the center device 31.

Upon receiving the ACK1 signal from the PBX 34, the center device 31 sends a second dial for designating an extension for making a no ringing call to the PBX 34. Upon receiving the second dial, the PBX 34 makes a no ringing call to the corresponding extension by the FSK (frequency modulation) signal. The FSK signal sent from the PBX 34 to the extension is an ASCII code and makes a no ringing call to the extension designated from the plurality of extensions.

The PBX 34 is a designated terminal network controller 3
For example, as shown in FIG. 3, the FSK signal is transmitted to 5A or 35B for about 1 second. Upon receiving the FSK signal, the terminal network control device 35A or 35B sends A to the center device 31.
Send the CK2 signal. Thereafter, data communication is performed between the center device 31 and the terminal side network control device 35A or 35B.

As another embodiment, the PBX 34 sends the FSK signal to the designated terminal network controller 35A or 35B four times per second as shown in FIG. Upon receiving the FSK signal, the terminal network control device 35A or 35B sends an ACK2 signal to the center device 31. For example, when the terminal network control device 35A receives the FSK signal for the second time, the terminal side network control device 35A sends the ACK2 signal to the center device 31 after the PBX 34 has finished sending the second signal. To do.

[0013]

As described above, according to the present invention, the PB receiving circuit is transmitted to the terminal side network control device by calling the terminal side network control device of the extension from the private branch exchange such as an apartment house by the FSK signal. Is unnecessary and can be deleted, so that a low-cost terminal-side network control device can be realized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a no-ringing communication system for an apartment house in which the present invention is implemented.

FIG. 2 is a block diagram showing the configuration of the terminal side network control device.

FIG. 3 is a time chart showing an example of signal transmission between the PBX and a designated terminal-side network control device.

FIG. 4 is a time chart showing another example of signal transmission between the terminal side network control device also designated as PBX.

FIG. 5 is a block diagram showing a configuration of a conventional no-ringing communication system for an apartment house.

[Explanation of symbols]

 30 Apartment House 31 Center Device 34 Private Branch Exchange (PBX) 35A, 35B Terminal Side Network Control Device

Claims (4)

[Claims] 1. A housing complex for making a no ringing call to a terminal connected to an extension designated by a calling side when an incoming call is received through a specific line of a plurality of general subscriber telephone lines connected to a private branch exchange. No ringing communication system for a residential complex, wherein a no ringing call is made between the private branch exchange and a terminal connected to the private branch exchange by an FSK signal. 2. A no-ringing communication system for a housing complex according to claim 1, wherein said private branch exchange uses an ASCII code when making a no-ringing call to the terminal with an FSK signal. 3. The private branch exchange continuously sends an ASCII code by FSK to a terminal designated by the center device side for a predetermined period, and the terminal transmits the ASCII code.
The no-ringing communication system for housing complex according to claim 2, wherein when receiving the code, a response signal is sent to the center device. 4. The private branch exchange sends an ASCII code by FSK to a terminal designated by the center apparatus side several times within a predetermined period, and when the terminal receives the ASCII code, a response signal is sent to the center apparatus. The no-ringing communication system for a housing complex according to claim 2, which is transmitted.