JPH02177657A - Remote monitoring system in isdn - Google Patents

Abstract

PURPOSE:To simplify a device by selectively sending either an ALERT (calling) message or a RELCOMP(releasing completion) message according to the state of a sensor when a calling number included in a call control signal at incoming time is a previously stored monitoring side number. CONSTITUTION:When an incoming call is received in an ISDN line 17, a control part 12 decides whether a continuously incoming calling number 'coincides' with a number previously stored in a memory or not. When both the numbers 'coincide' with each other, the control part 12 judges that a terminal, to which the control part 12 belongs, itself is a terminal to be called according to a continuously incoming terminal number and, for example, controls the sending of the ALERT (calling) message when a sensor 15 is under an ON state according to the state output signal of the sensor 15. At the same time, the control part 12 sends a DISC(disconnection) message after fixed time lapses, confirms the coming of an REL(releasing) message from the side of an ISDN network 3, and sends the RELCOMP(releasing completion) message. Thus, remote monitoring can be executed within the range of the operation of the terminal based on the call control signal to be transmitted/received before a B channel link is set, and the whole device never becomes complicated.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a remote monitoring system in l5DN (digital integrated service network).

"Prior Art" Remote monitoring devices that monitor conditions at remote locations via general telephone lines are widely known. This type of device consists of a center device (monitoring device) and a terminal device (monitored device).
The center device is equipped with an auto-dial device for calling the terminal device, a data transmission/reception circuit equipped with, for example, a multi-frequency signal generator and receiver for transmitting and receiving data with the terminal device, display means, etc. The terminal device is provided with one or more sensors and a multi-frequency signal generator for transmitting the state of each sensor as data to the center device. Depending on the location, multiple terminal devices are installed, which are sequentially called by the center device and send and receive signals to each other.The terminal devices can perform remote monitoring by sending sensor status data to the center device. It is done.

``Problems to be solved by the invention'' As mentioned above, the technology for remote monitoring using general telephone lines is well known, but the remote monitoring method in ISDN, especially considering the communication procedures of ISDN, is rational. There are few proposals for remote monitoring systems that perform similar operations.

Therefore, the present invention aims to provide a remote monitoring method that can simplify the entire device by focusing on the call control signal sent and received prior to setting up the I5DNI7) B channel link and making rational use of this signal. be.

Therefore, in the present invention, a terminal device is connected to a line via a line terminating device, and prior to setting up a B channel link, D channel call control signals are transmitted between the terminal devices via an exchange. In the 15DN, which is configured to send and receive data using O
A sensor that sends out outputs of N and OFF, a storage device that stores number information of a specific partner terminal in advance, and a device that matches the calling number included in the call control signal at the time of incoming call and the number information stored in the storage device. A number match detecting means for detecting a match and a sensor input circuit for sending a signal to the control unit of the terminal device according to the state of the sensor are added, and when a match detection output is obtained by the number match detecting means, the terminal device The control unit performs ALERT (calling) in response to the output signal of the senna input circuit.
By selectively controlling the interface circuitry to send a RELCOMP (release complete) message after sending a message, or to send a RELCOMP message immediately, ! ! ! This system is designed to notify the sensor status information to the other side.

"Operation" With the above-described configuration, when the calling number included in the call control signal at the time of one incoming call is the pre-stored number of the monitoring side, the terminal device selectively sends A, A, etc. depending on the state of the Senna. L.E.
Sends an RT (call) message or a RELCOMP (release complete) message.

"Embodiment" The remote monitoring system according to the present invention will be described below based on the drawings.

FIG. 1 is a block diagram of a terminal device that employs the remote monitoring method according to the present invention, and FIG. 2 is an ISDN diagram including the terminal device.
FIG. 2 is a block diagram showing a connection relay image. FIG. 3 is a flowchart illustrating an overview of the operation of the terminal device based on call control signals transmitted and received prior to setting up a B channel link.

l is a terminal device that connects the l5DN network 3 (
connected to an exchange (exchange). The terminal device 1 has a line interface 11. Control unit 12. An operating section 13 is provided,
The operation unit 13 includes a keyboard 13a, a handset 13b,
It is composed of a hook switch 13C and the like. Although some devices are equipped with a display, the operation of the control unit 12 in each terminal device 1, especially the operation according to the call control signal up to B channel link setting, is as shown in 3I2I. In other words, when a 5ETUP message is received due to an incoming call, the called subaddress number (terminal number) is
Check for “match” and if a match is obtained, ALERT
(Call) Send a message. Next, when the operator goes off-hook, this is detected, a C0NN (response) message is sent, and the ISDN network 3 (IN to C0
You will receive a NNACK (response confirmation) message, and once you confirm it, you will be communicating.

Further, when the line is subsequently released, ISDIIM3[11 is controlled by sending a DISC (disconnection) message and a RELCOMP message.

As mentioned above, in ISDN, call control signals are sent and received prior to setting up a B channel link for, for example, a call, confirmation of "match" of terminal numbers, and ALERT.
(Call) Messages, etc. are sent.

The present invention was devised in consideration of the transmission and reception of call control signals described above, and is provided with a memory 14 for storing a calling number, a sensor 15, and a sensor input circuit 16 for a conventional terminal device, and a control unit 12. For example, a microprocessor program is configured to perform operations as shown in the flowchart of FIG.

Next, the process will be explained in detail with reference to the flowchart shown in FIG.

When an incoming call is received on the 15DN line 17, a 5ETUP message is sent to the control unit 12 via the line termination device 188 line interface.

In response to this, the control unit 12 selects the subsequently arriving calling number (
The caller's terminal number) matches the number stored in memory in advance (confirmation by the center device).
If the match is 1, it is determined whether or not it is the called terminal device based on the subsequently arriving terminal number (terminating subaddress number) (a determination made by conventional terminal devices). When it is determined that the sensor input circuit 1
The state output signal of the sensor 15 is taken in through the state output signal 6, and depending on the state output signal, for example, if the sensor is ON, it controls the sending of an ALERT (calling) message and starts a timer configured by a program. , DISC (
Disconnect) Send message, l5DNW43r! After confirming the arrival of the REL (release) message from s,
Controls to send an OMP (release complete) message. On the other hand, if the sensor is OFF, immediately turn on RELCO.
Each line interface 11 is controlled to send an MP (release complete) message.

As a result, each of the above messages reaches the calling terminal device 1 (lb) via the 15DN network 3. Therefore, the calling terminal device 1 can check the status of the sensor 15 provided in the monitored terminal device 1 (la) before setting the B channel link. Note that in FIG. 1, a plurality of sensors 15 are provided. In this case, the sub address number (
It is possible to allocate a maximum of 40 octets and monitor the status of each sensor in polling format.

Furthermore, although the terminal device l shown in FIG. 1 is added according to the present invention to a conventional device provided with the operation section 13, the configuration has been explained.
It may also be a dedicated terminal device as a remote monitoring device, in which case the operation unit 13 is unnecessary.

"Effects of the Invention" As explained above, according to the present invention, it is possible to remotely monitor the operation of the terminal device based on the call control signal sent and received before the B channel link is established, which is extremely rational, and the device The whole thing is not complicated.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram of a terminal device that employs the remote monitoring method according to the present invention, Fig. 2 is a block diagram showing an image of an I5DN connection relay including the terminal device, and Fig. 3 is a block diagram showing an image of an I5DN connection relay including the terminal device. FIG. 3 is a flowchart illustrating an overview of the operation of the terminal device based on call control signals transmitted and received prior to setting up a B channel link.

Claims (1)

[Claims] A terminal device is connected to the line via a line termination device, and B
In ISDN, in which D-channel call control signals are sent and received between terminal devices via an exchange prior to setting up a channel link, the terminal devices are equipped with sensors that send ON and OFF outputs, and a sensor that sends out ON and OFF outputs, and storage means for storing number information in advance; number matching detection means for detecting a match between the calling number included in the call control signal at the time of incoming call and the number information stored in the storage means; and a terminal device according to the state of the sensor. When a sensor input circuit for sending a signal is added to the control section of the terminal device and a match detection output is obtained by the number match detection means, the control section of the terminal device performs an ALERT (calling) function in response to the output signal of the sensor input circuit. ) by selectively controlling the interface circuit to send the RELCCOMP message after sending the RELCCOMP message;
A remote monitoring system in ISDN characterized in that sensor status information is notified to the calling terminal device side.