JPH02270464A - Backup notice system by pb tone - Google Patents

Abstract

PURPOSE:To attain the communication on emergency such as an accident or defect in a building by sending a PB signal from a 1st terminal equipment having a PB tone transmission function at a fault of communication to a center and informing the communication fault to a 2nd terminal equipment having a PB tone reception function. CONSTITUTION:When a communication fault of a center 20 such as system-down takes place, no communication is possible. Then a terminal equipment B informs the communication fault to a terminal equipment A as an information route at fault. Since an input and output device 4 of the terminal equipment B has a PB tone transmission function, an input and output device 12 having a PB tone reception function receives the PB signal by sending the PB signal informing the fault of the center 20 from the input and output device 4.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a communication method in a building management system,
Buffer notification method using a PB tone from a terminal device especially when a communication failure occurs at the center (Prior art) Conventionally, as a technology in this field, there have been the following, for example.

BACKGROUND ART Conventionally, as a communication means in a building management system, a modem is used to communicate between a center in a building and a terminal device.

FIG. 2 is a block diagram of a communication system using a conventional digital electronic exchange (PBX5).

Currently, digital electronic exchanges are becoming important in companies, hotels, etc., as a means of facilitating business operations, saving labor, and managing them.

In the figure, 40 is a digital electronic exchange, LC41 and 42 are general subscriber circuits, FLC43 is a subscriber circuit for multi-function telephones, DSC44 is a one-touch call control circuit, and DLC45
is a digital subscriber circuit, ARU46 is a voice response unit, C
0BWT47 is the office line trunk, 50 is the office line trunk, P
VT48 is a leased line trunk, DPVT49 is a digital leased line trunk, PO351 is a relay control circuit, ADT5
2 is an analog/digital trunk, MRG53 is a call management device, CP54 is a central processing unit that centrally controls the digital electronic exchange 40, 10 C55, 58, and 59 are I1
0 control circuit, RAM56 is arbitrary write memory, ROM5
7 is read-only memory, IF60 is interface, M
C361 is a maintenance console, 63 is a central office trunk 50
64 is the relay console control circuit 51 connected to the
The relay console 65 and 77 are modems, and the billing console 66, wake-up call console 67, and center 68 are each connected to the call management device 53. Further, 69 is a data termination device connected to the digital subscriber circuit 45, To, 72, 78, 80 is a terminal device, 71.74 is a multi-function telephone, and DSS73 is a one-touch call console connected to the one-touch call control circuit DSC44. , 75 is a network control circuit, 76 and 81 are general telephones,
79 is a system phone, and 82 is a facsimile.

With this configuration, for example, if you want to communicate from the terminal device 78 to the center 68, you can easily access it.

(Problems to be Solved by the Invention) However, if the center 68 goes down, communication from the terminal device 78 becomes impossible, which is a problem.

In particular, if communication becomes impossible in an emergency such as a building disaster or an accident, it is important to take some means to be able to report to the center.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems and provide a backup notification method using a PB tone that allows a terminal device to notify another terminal device of the failure even in the event of a communication failure at the center. .

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an input/output device having a PB tone sending function in a modem communication system equipped with a central office exchange and connecting a center and a terminal device via a telephone line. A first terminal device including an input/output device having a PB tone receiving function, a second terminal device including an input/output device having a PB tone receiving function, and a PB double signal is emitted from the first terminal device when there is a failure in communication to the center, and a second terminal device includes a PB tone receiving function.
The terminal device is provided with means for reporting a communication failure to the terminal device.

(Function) According to the present invention, as shown in FIG.
If the communication system from terminal B to the center (
20) and can communicate with it. However, in the case of a communication failure in the center (20), for example, when the center (20) goes down, the input/output device (4) connected to the processing circuit (2) of the terminal device B sends a message to the PB that reports the failure of the center (20). Signal transmission and synthesis circuit (5) → 2-wire/4-wire conversion hybrid circuit (6) → Network control circuit (7) → Central office exchange (8) → Network control circuit (16) → 2-wire/4-wire conversion hybrid circuit (15), the PB double signal can be received by the input/output device (12) of the terminal device A.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a communication system having a backup function using PB tones, showing an embodiment of the present invention.

In this figure, 1 is a terminal device B, and 10 is a terminal device A.

Here, the terminal device B includes a processing circuit 2, a modem 3, an input/output device 4 having a PB tone transmission function, a synthesis circuit 5, a 2-wire/4-wire conversion hybrid circuit 6, and a network control circuit 7. It is connected to an external line by a central office exchange 8. The terminal device A also includes a processing circuit 11, an input/output device 12 having a PB tone reception function, an audio output circuit 13, a synthesis circuit 14, a 2-wire/4-wire conversion vibe 2-lint circuit 15, and a network control circuit 16. It is connected to an external line by a central office exchange 8.

Furthermore, the center 20 is equipped with a processing circuit 21, a modem 22, an input/output device 23, a combining circuit 24, a 2-wire/4-wire conversion hybrid circuit 25, and a network control circuit 26, and is connected to an external line by the central office exchange 8. has been done. This central office exchange 8 includes a telephone 30 and many other terminal devices (not shown).
etc. are connected.

Therefore, if you want to communicate from the terminal device B to the center 20, use the normal data transmission route, that is, from the input/output device 4, combine circuit 5 → 2-wire/4-wire conversion hybrid circuit 6 →
Network control circuit 7 → central office exchange 8 → network control circuit 26 → 2vA/
4-wire conversion hybrid circuit 25→via modem 22,
Communication is performed using the PB double signal.

However, if there is a communication failure in the center 20, for example if it goes down, communication cannot be established.

Therefore, in the present invention, the communication failure can be reported from the terminal device B to the terminal device A as a reporting route in the event of an abnormality.

Since the input/output device 4 of the terminal device B has a PB tone sending function, a PB tone is sent from there to report a failure in the center 20.
Double signal generation and synthesis circuit 5 → 2-wire/4-wire conversion hybrid circuit 6 → network control circuit 7 → central office exchange 8 → network control circuit 16 →
By transmitting the signal through the 2-wire/4-wire conversion hybrid circuit 15, this PB multiplied signal can be received by the input/output device 12 having a PB tone receiving function.

That is, the PB double signal for line selection of terminal device B, the telephone P
The signal can be sent to the terminal device A which receives the B-fold signal, and the signal processing at the center 20 can be taken over there.

When the PB double signal from the input/output device 4 is received, the operator or manager of the terminal device A can contact the manager of the center 20 as appropriate. In addition, the operator or manager of the terminal device A can connect the input/output device 12 to the combining circuit 14 → 2-wire/4-wire conversion hybrid circuit 15 → network control circuit 16 → central office exchange 8.
It is also possible to communicate with the telephone 30 via the telephone 30 and report the fact to building management personnel.

Furthermore, it may be connected to an alarm device as appropriate.

Note that the present invention is not limited to the above embodiments,
Various modifications are possible based on the spirit of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) As described above in detail, according to the present invention, when a center failure occurs, for example, when the center goes down, an F'B tone is sent from the terminal device B having the PB tone sending function, and the F'B tone is transmitted to another terminal. By equipping device A with a PB tone reception function,
It is possible to report a communication failure at the center to another terminal device A, and further notify the operator of the center of this report.

Therefore, even in the event of a communication failure at the center, the terminal device can easily report the occurrence of the failure.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a communication system having a bank amplifier function using PB tones, showing an embodiment of the present invention, and FIG. 2 is a block diagram of a communication system using a conventional electronic exchange. 1... Terminal device B, 2.11.21... Processing circuit,
3゜22...Modem, 4...I/O device having PB tone sending function, 5.14.24...Synthesizing circuit, 6
．． 15.25...2-wire/4-wire conversion hybrid circuit,
7.16.26... Network control circuit, 8... Central office exchange,
DESCRIPTION OF SYMBOLS 10... Terminal device A, 12... Input/output device having a PB tone reception function, 13... Audio output circuit, 20...
...Center, 23...I/O device, 30...Telephone. Patent applicant Oki Electric Industry Co., Ltd.

Claims (1)

[Scope of Claim] A modem communication system comprising a central office exchange and connecting a center and terminal devices via a telephone line, comprising: (a) a first terminal device including an input/output device having a PB tone sending function; (b) ) a second terminal device including an input/output device having a PB tone receiving function;
1. A backup notification method using a PB tone, characterized in that the method includes means for emitting a B signal and notifying a second terminal device of a communication failure.