JP3703602B2 - ISDN terminal controller - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ISDN terminal device connected to an ISDN (Integrated Services Digital Network), and in particular, an ISDN terminal device that enables prompt emergency notification even when all B channels for information transmission are in use. About.
[0002]
[Prior art]
A reporting device that detects the occurrence of an emergency such as a fire or an abnormal situation such as an intruder and reports the emergency or abnormal situation to a monitoring center has been put into practical use.
When such an informing device detects an emergency or abnormal situation, it automatically sends a call setting message to the monitoring center to establish a connection with the monitoring center, and then sends information to the monitoring center.
[0003]
However, if the line is in use, the call setup message cannot be transmitted, and it is necessary to wait until the communication is completed and the line is released. For example, in the event of a fire, if the report could be made immediately, the fire could be extinguished, but there was a risk that the damage was expanded because the report was delayed.
In order to solve this problem, when this notification device is connected to a conventional analog public line, when a signal indicating that an emergency / abnormal situation is detected is output from this communication device, a direct connection loop of the public line is set. A terminal control device that forcibly terminates communication by temporarily releasing and releasing a line has been put into practical use. After the line is released by the terminal control device, the notification device can make a call according to a normal procedure, establish a connection, and send information to the monitoring center.
[0004]
In recent years, in order to improve the communication speed, ISDN is often used instead of the conventional analog line. However, since the basic interface of ISDN includes two B channels for transmitting user information, one ISDN line is used. Two types of terminals (telephone, telefax, etc.) can be used simultaneously. Accordingly, there are few cases where both of the B channels are in use at the same time, and there is little possibility that the notification to the monitoring center is delayed as compared with the case where a conventional analog line is used.
[0005]
However, not only telephones but also terminal devices connected to telephone lines such as facsimiles and personal computers are increasing, and there are increasing opportunities for all B channels to be in use.
Therefore, even when the above-mentioned reporting device is connected to ISDN, when the reporting device detects an emergency / abnormal situation, an ISDN terminal control device that can report from the reporting device even if all B channels are in use It is desirable to use
[0006]
A forced line securing device for solving the above problem has already been proposed (see JP-A-6-85960).
FIG. 1 is a conceptual diagram of a forced line securing device according to the above proposal. A monitoring center 11 is connected to a DSU (Digital Service Unit) 13 installed in a user's home via a network 12.
[0007]
A home bus 19 extending from the DSU 13 via the relay 14 is connected to a notification device 15 for reporting an emergency / abnormal situation, a telephone 17 and a facsimile 18 via a TA (Terminal Adapter) 16.
In this configuration, when the notification device 15 detects an emergency / abnormal situation while the telephone 17 and the facsimile 18 are in use, the relay 14 is operated to forcibly disconnect the home bus and release the line.
[0008]
[Problems to be solved by the invention]
However, in the case of disconnection on the downstream side of the DSU 13, since the line is actually released by the exchange from the start of disconnection and it takes several minutes until the call setup message can be transmitted from the notification device 15, it is quick. It was difficult to prevent the spread of damage due to the inability to report.
[0009]
Further, when a failure occurs in a terminal device connected to the home bus, the failed terminal device may occupy the home bus and cannot be notified from the notification device.
Furthermore, since only one DSU is installed, it is impossible to report from the reporting device even if the DSU fails.
[0010]
The present invention has been made in view of the above problems, and an object of the present invention is to provide an ISDN terminal control device capable of promptly and reliably sending an emergency / abnormal situation.
[0011]
[Means for Solving the Problems]
FIG. 2 is a block diagram including the ISDN terminal control device according to the first invention. The ISDN terminal control device (2) according to the first invention is installed upstream of the DSU (13). The connection / separation means (21) for “connecting” or “disconnecting” the connection between the network and the network (12), and the DSU (13) and its downstream when sending a call setup message for reporting an emergency / abnormal state If all the B channels of the home bus (19) that connects the terminal device and the installed terminal device (15, 17, 18) are in use, the DSU (13) and the line network are set in the “disconnected” state with the contact / separation means in the “disconnected” state. Control means (22) for reconnecting the DSU (13) to the line network after disconnecting (12) and setting the contact / separation means (21) in the "contact" state.
[0012]
If all the B channels are in use when reporting an emergency / abnormal state, this ISDN terminal control device disconnects the line once on the upstream side of the DSU, releases the line, and then sends a call setup message to send an emergency / Report abnormal situations.
FIG. 3 is a block diagram including the ISDN terminal control device according to the second invention. The ISDN terminal control device (3) according to the second invention is a notification device (15) for reporting an emergency / abnormal state. A second DSU (31), which is installed separately from the first DSU (13) to which a plurality of terminal devices including the same are connected and only the reporting device is connected, and the first DSU (13) or the second DSU select one either installed on the upstream side and selectively switching means for connecting to a network (32), one either call device (15) of the first DSU (13) and a second DSU (31) First connecting / disconnecting means (33) for connecting the terminal and a home bus (19) for connecting the first DSU (13) and the terminal device when sending a call setup message for reporting an emergency / abnormal state If all B channels are in use, switching means (3 A control means (34) for connecting the second DSU (31) to the network (12) by the above and connecting the reporting device (15) to the second DSU (31) by the first contact / separation means (33); It comprises.
[0013]
This ISDN terminal control device disconnects the first DSU from the line network and connects the second DSU to the line network even when all B channels are in use when reporting an emergency / abnormal state. After the notification device is connected to the second DSU by the first contact / separation means, a call setting message is transmitted to notify the emergency / abnormal situation.
In the ISDN terminal control device according to the third invention, the second switching means connects the first DSU and the notification device with the first contact / separation means for disconnecting the connection between the second DSU and the notification device. And a second contact / separation means for separating.
[0014]
In this ISDN terminal control device, the emergency / abnormal state is reported via the second DSU even if the home bus is occupied due to a failure of the terminal device other than the reporting device.
In the ISDN terminal control apparatus according to the fourth invention, the control means is using all the B channels of the home bus for reasons other than receiving the call setting message when sending the call setting message for reporting the emergency / abnormal state. The control is executed when
[0015]
This ISDN terminal control device does not disconnect the DSU and the line network by the switching means if the call setting message is being received when the call setting message is transmitted, and after sending a response signal, sends a disconnect message to connect the line. After releasing, a call setup message is sent to notify the emergency / abnormal situation.
The ISDN terminal control device according to the fifth invention further comprises delay means for delaying the start of control by the control means when a call setup message is being received when a call setup message is sent to notify an emergency / abnormal state. It has.
[0016]
The ISDN terminal control device according to the sixth aspect of the present invention performs the above-mentioned control after executing the incoming call processing when the call setting message is being received when the call setting message is transmitted for notifying the emergency / abnormal state. The apparatus further includes incoming processing means for instructing the means to start control.
The ISDN terminal control device according to the fifth and sixth inventions performs incoming processing if a call setup message is being received when the call setup message is sent out, and once the call is in progress, sends a disconnect message and releases the line. Later, a call setup message is sent to notify the emergency / abnormal situation.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 4 is a block diagram centering on the embodiment of the ISDN terminal control apparatus according to the first invention. The ISDN terminal control apparatus 44 according to the present invention is also connected to the network 42 to which the monitoring center 41 is connected. Is done.
The common terminal 441 c of the changeover switch 441 that constitutes the ISDN terminal control device 44 is directly connected to the line network 42. The first DSU 43 is connected to one switching terminal 441a of the changeover switch 441, and the other terminal 441b is opened.
[0018]
The first residential bus 49 drawn from the downstream side of the first DSU 43 is connected not only to the telephone 47 and the facsimile 48 via the TA 46 but also to the interface 446C of the control unit 446.
The control unit 446 is a microcomputer system and includes a CPU 446b, an interface 446c, and a memory 446d with a bus 446a as a center. The interface 446 c is connected to the notification device 45 and the changeover switch 441.
[0019]
The notification device 45 is connected to a fire detection device or an intruder detection device (not shown). Upon detecting a fire or an intruder, the notification device 45 transmits a notification request to the control unit 446 via the interface 446c, When receiving the notification request, the control unit 446 executes a control routine stored in the memory 446d as an interrupt process.
[0020]
FIG. 5 is a flowchart of the first control routine. When the control unit 446 does not operate, the DSU 43 is connected to the network 42 by the changeover switch 441.
In step 501, it is determined whether an urgent or abnormal notification request is output from the notification device 45, and waits until a notification request is output. When the report request is output, an affirmative determination is made and the routine proceeds to step 502.
[0021]
In step 502, it is determined whether all the B channels of the home bus 49 are in use. That is, using the D channel of ISDN, a call setup message is sent to the network 42 to notify the monitoring center 41, and when a release completion message for the call setup message is received from the network, all B channels are in use. It is determined that there is, and the process proceeds to step 503. On the other hand, if the call completion acceptance message is received without receiving the release completion message, a negative determination is made, and this routine is directly terminated. Although not shown, when a line between the reporting device 45 and the monitoring center 41 is established thereafter, emergency information is transmitted from the reporting device. Then the line is released and the notification is terminated.
[0022]
In step 503, it is determined whether at least one B channel has received the call setup message, that is, is being called from the network 42. If at least one B channel has received the call setup message, an affirmative determination is made and processing proceeds to step 504.
In step 504, a response message for the call setup message is sent, and after receiving processing such as receiving a response confirmation message from the line network 42, a pseudo communication state is established, and then a disconnect message is sent to the line network 42. To do. Thereafter, when a release completion message is received from the network 42, the release completion message is sent to the network 42 as a response signal. Thereby, the B channel is released, and the process returns to Step 502. Therefore, since the notification device 45 once executes the incoming call processing to establish the communication state and then releases the line, it is not necessary to disconnect the communication on the other B channel in use. In this case, since there is a vacancy in channel B in step 502, a negative determination is made and an emergency or abnormality report can be made.
[0023]
When no call setting message is received, that is, when a call setting message is transmitted from the telephone 47 or the facsimile 48 which is the terminal device of the own station, and when the telephone 47 or the facsimile 48 is busy, a step is performed. Proceeding to step 505, the line is opened for a predetermined time by the changeover switch 441 and then reconnected to forcibly terminate the state in which a call setting message is being transmitted or in communication (disconnect process), and the process returns to step 502. The predetermined time is a time during which it is possible to recognize that the exchange (not shown) included in the network 42 has become unable to talk. Also in this case, since there is a vacancy in the B channel, a negative determination is made in step 502, and an emergency or abnormality report can be made.
[0024]
FIG. 6 is a flowchart of the second control routine. The first control routine is different from the first control routine in that step 601 is executed instead of step 504. Therefore, the difference will be mainly described below.
That is, if all the B channels are in use, it is determined in step 503 whether a call setup message has been received, that is, whether it has been called from the network 42. If a call setup message is received, an affirmative determination is made, delay processing is performed in step 601, and the flow returns to step 502. This delay process is to execute the incoming call process once in the notification device 45 to make a pseudo communication state. Therefore, this delay time is set as a time longer than the time required for the disconnection processing such as the notification device 45 once executing the incoming call processing and further sending the disconnection message to the circuit network.
[0025]
Note that when the call setup message is not received, that is, when the call setup message is transmitted from the telephone 47 or the facsimile 48 which is the terminal device of the own station, and when the telephone 47 or the facsimile 48 is in communication, it is directly Proceeding to step 505, the following processing is the same as the first control routine.
Although the incoming call process is executed by the notification device 45, an incoming call processing function may be included in the control unit 446 , and the incoming call process may be executed instead of the delay process in step 601.
[0026]
In this case, when the call setting message is received, the control unit 446 executes the incoming call processing to make the communication once, and then the line can be disconnected and released in step 505.
In the first invention described above, an emergency call can be made in a short time even when all the B channels are in use, but since only one DSU is installed, at least one of the terminal devices (phone 47 or facsimile 48). If one of them breaks down, it may not be possible to make an emergency call because the B channel is occupied.
[0027]
The second invention improves the above-described problem and reduces the probability of not being able to report.
FIG. 7 is a block diagram centering on the embodiment of the ISDN terminal control apparatus according to the second invention, and the same reference numerals are used for the same elements as in FIG.
The common terminal 441 c of the changeover switch 441 that constitutes the ISDN terminal control device 44 is directly connected to the line network 42. The first DSU 43 is connected to one switching terminal 441a of the changeover switch 441, and the second DSU 442 is connected to the other terminal 441b. That is, the changeover switch 441 is used to selectively connect one of the first DSU 43 and the second DSU 442 to the network 42.
[0028]
The first residential bus 49 drawn from the downstream side of the first DSU 43 is not only connected to the telephone 47 and the facsimile 48 via the TA 46 but also to one switching terminal 444a of the second contact / separation switch 444. Is also connected.
The second residential bus 447 drawn from the downstream side of the second DSU 442 is connected to the interface 446C of the control unit 446 and the common terminal 444c of the second contact / separation switch 444 via the first contact / separation switch 443. The The terminal resistor 445 of the second home bus 447 is connected to the other switching terminal 444b of the second contact / separation switch 444.
[0029]
FIG. 8 is a detailed configuration diagram (A) of the first contact / separation switch 443 and a detailed configuration diagram (B) of the second contact / separation switch 444. As described above, the basic interface has two B channels and is composed of four cables.
Four common terminals 443c (c1, c2, c3, c4) of the first contact / separation switch 443 are connected to the second DSU 442, and one of the four switching terminals 443a (a1, a2, a3, a4) is the second. Connected to the home bus 447. The other four switching terminals 443b (b1, b2, b3, b4) are released. That is, the first contact / separation switch 443 is used to connect and disconnect the second home bus 447 and the second DSU 442.
[0030]
The four common terminals 444c (c1, c2, c3, c4) of the second contact / separation switch 444 are connected to the second residential bus 447 via the interface 446c, and are connected to one of the four switching terminals 444a (a1, a2, a2). a3, a4) are connected to the first residential bus 49. Of the four other switching terminals 444b (b1, b2, b3, b4), b1 and b2 are connected via a first termination resistor 4451, and b3 and b4 are connected via a second termination resistor 4552. Connected.
[0031]
That is, when the common terminal 444c and one switching terminal 444a are respectively connected by the second contact / separation switch 444, the notification device 45 can communicate via the first home bus 49, and the common terminal 444c and the other switching terminal 444a can communicate with each other. When one terminal 444b is connected to each other, the second home bus 447 is terminated by termination resistors 4451 and 4452.
[0032]
Operations of the changeover switch 441, the first contact / separation switch 443, and the second contact / separation switch 444 are controlled by the control unit 446.
That is, the interface 446 c is connected to the notification device 45, the changeover switch 441, the first contact / separation switch 443, and the second contact / separation switch 444.
FIG. 9 is a flowchart of the third control routine, which differs from the first control routine only in that step 901 is executed instead of step 505. Differences will be described below.
[0033]
When the control unit 446 does not operate, the changeover switch 441 has the common terminal 441c connected to one terminal 441a and the first DSU connected to the line network 42. The first contact / separation switch 443 is in the released state, the second contact / separation switch 444 has the common terminal 444c connected to one terminal 444a, and the notification device 45 is connected to the first home bus 49.
[0034]
That is, the processing in steps 501 and 502 is the same as that in the first control routine. If it is determined in step 503 that the call setup message is not being received, the following control is executed in step 901 and then step 502 is executed. Return to.
1. The connection destination of the common terminal 441c of the changeover switch 441 is switched from one terminal 441a to the other terminal 441b. That is, the DSU connected to the line network 42 is switched from the first DSU 43 to the second DSU 442.
[0035]
2. The first contact / separation switch 443 is changed from “off” to “on”. That is, the second home bus 447 is connected to the second DSU 442.
3. The connection destination of the common terminal 444c of the second contact / separation switch 444 is switched from one terminal 444a to the other terminal 444b. That is, the second residential bus 447 is terminated with the termination resistor 445.
[0036]
With the above control, the reporting device 45 is connected to the monitoring center 41 via the first contact / separation switch 443, the second DSU 442, and the changeover switch 441.
If the call setting message is being received, the process proceeds to step 504. After the incoming call process is performed and the call is in progress, a "disconnect message" is transmitted and the process returns to step 502.
[0037]
FIG. 10 is a flowchart of the fourth control routine, which differs from the third control routine only in that step 601 is executed instead of step 504, but the processing content of step 601 is the second control routine. As already explained in the routine.
[0038]
Although not shown, if the first home bus 49 is short-circuited or the first DSU fails, a call setup message cannot be sent to the network 42 in step 502, and a release completion message is also displayed. Cannot receive. Therefore, if the release completion message is not received within a predetermined time after the call setup message is transmitted, it is possible to make a report by proceeding to step 901.
[0039]
【The invention's effect】
According to the ISDN terminal control apparatus according to the first invention, even when all B channels are in use when reporting an emergency / abnormal state, the call is made after the line is disconnected and the line is released on the upstream side of the DSU. By sending a setting message, it is possible to report an emergency / abnormal situation quickly and reliably.
[0040]
According to the ISDN terminal control device of the second invention, even when all the B channels are in use when reporting an emergency / abnormal state, the first DSU is disconnected from the network by the switching means. By sending a call setup message after connecting the DSU to the network and connecting the reporting device to the second DSU by the first contact / separation means, it is possible to report emergency / abnormal situations quickly and reliably. It becomes.
[0041]
According to the ISDN terminal control device according to the third aspect of the invention, the emergency / abnormality is made via the second DSU even when the home bus is occupied due to the failure of the terminal device other than the reporting device or the first DSU. It is possible to report the status.
According to the ISDN terminal control device of the fourth invention, if a call setup message is being received when the call setup message is sent, a disconnect message is sent without disconnecting the DSU from the network by the switching means. By sending a call setup message after releasing the line, it is possible to report an emergency / abnormal situation quickly and reliably.
[0042]
According to the ISDN terminal control devices according to the fifth and sixth inventions, if a call setup message is being received when the call setup message is transmitted, the incoming call processing is performed, and once the call is in progress, the line is disconnected upstream of the DSU. By sending a call setup message after releasing the line, it is possible to report an emergency / abnormal situation quickly and reliably.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a conventional forced line securing device.
FIG. 2 is a block diagram including an ISDN terminal control apparatus according to the first invention.
FIG. 3 is a block diagram including an ISDN terminal control apparatus according to a second invention.
FIG. 4 is a block diagram centering on an embodiment of the ISDN terminal control apparatus according to the first invention;
FIG. 5 is a flowchart of a first control routine.
FIG. 6 is a flowchart of a second control routine.
FIG. 7 is a configuration diagram centering on an embodiment of an ISDN terminal control apparatus according to a second invention;
FIG. 8 is a detailed configuration diagram of an approach / separation switch.
FIG. 9 is a flowchart of a third control routine.
FIG. 10 is a flowchart of a fourth control routine.
[Explanation of symbols]
41 ... Monitoring center 42 ... Network 43 ... First DSU
44 ... ISDN terminal controller 441 ... changeover switch 442 ... second DSU
443 ... 1st contact / separation switch 444 ... 2nd contact / separation switch 445 ... Terminating resistance 446 ... Control part 447 ... 2nd indoor bus 45 ... Notification apparatus 46 ... TA
47 ... telephone 48 ... facsimile 49 ... first residential bus

Claims (4)

A connection / separation means that is installed upstream of the DSU and that connects or disconnects the connection between the DSU and the network;
When sending out a call setup message for reporting an emergency / abnormal condition, if all the B channels of the residential bus connecting the DSU and the terminal device installed downstream thereof are in use, the contacting / separating means is used. An ISDN terminal control apparatus comprising: control means for disconnecting the connection between the DSU and the line network in a “disconnected” state, and for reconnecting the DSU to the line network in a “connected” state after a predetermined time. A second DSU that is installed separately from the first DSU to which a plurality of terminal devices including a notification device for reporting an emergency / abnormal state are connected, and to which only the notification device is connected;
A first switching unit installed on the upstream side of the first DSU and the second DSU and selectively connecting one of them to a network;
Second switching means for selectively connecting the reporting device to either the first DSU or the second DSU;
If all the B channels of the residential bus connecting the first DSU and the terminal device are in use at the time of sending a call setup message for reporting an emergency / abnormal state, the first switching means An ISDN terminal control device comprising: a control unit that connects a second DSU to a line network and connects the notification device to the second DSU by the second switching unit. The second switching means includes
First contact / separation means for disconnecting the connection between the second DSU and the notification device;
Second contact / separation means for disconnecting the connection between the first DSU and the notification device;
The ISDN terminal control apparatus according to claim 2 comprising: When the call setting message is transmitted to notify the emergency / abnormal state, the control means responds to the call setting message when all the B channels of the home path are in use and the call setting message is being received. 4. The ISDN terminal control device according to claim 1, wherein the ISDN terminal control device transmits a disconnect message after performing the incoming call processing.

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