JPS5922439B2 - Subscriber monitoring method - Google Patents

Description

[Detailed description of the invention] The present invention has a subscriber status monitoring function in the subscriber circuit.

The present invention relates to telephone switching systems, and more particularly to subscriber monitoring systems in connections where the subscriber is switched from the monitoring circuit of the subscriber circuit to provide telephone services such as testing or howler tones. Conventionally, in time-sharing electronic exchanges, the subscriber status monitoring function has been provided in the subscriber circuit provided for each subscriber, and the common control device that requires subscriber status information to execute telephone exchange processing is Information was to be received only from subscriber circuits.

However, as a telephone exchange, there are cases where it is necessary to connect to corresponding equipment without going through the subscriber circuit under known electrical conditions, such as for testing subscriber lines for maintenance and operation purposes, as well as for making phone calls. In these connections, each corresponding device monitors the status of the subscriber and transfers information on the subscriber status to the common control unit for each device. Therefore, in the common control device, it is necessary to change the partner device that receives subscriber status information depending on the connection type of the subscriber. Not only the total number of devices, but also the number of devices described above increases, which makes processing complicated and economically disadvantageous. FIG. 1 shows an example of a conventional subscriber monitoring system.

In this subscriber monitoring system, the subscriber circuit 2,
It consists of a test link 5, a howler sound transmission trunk 6, a scanning device 8, and a common control device 9. The subscriber circuit 2 monitors the status of the subscriber in response to the subscriber, and when the monitoring circuit 3 sends a howler sound to the subscriber 1, a switching relay T (not shown) is activated by the common control device 9. ) has a large contact point. Further, the test link 5 connects the subscriber circuit 2 and the howler sound transmission trunk 6. Further, the howler sound transmission trunk 6 is provided with a howler sound source □, a subscriber monitoring relay A, and its contact a, through which subscriber status information is read by the scanning device 8 and transferred to the common control device 9. be done. Note that these are configured separately from the call connection network 4. In the known subscriber lockout state, the common control device 9 closes the contacts in the subscriber circuit 2 and closes the test link 5 in order to send a howler sound to the subscriber 1. Subscribers and howler sound senders stay at rank 6 for a long time.

In the known time-sharing electronic exchange, the howler sound transmission connection using high-level signals provides service to the subscriber 1 without going through the call connection network 4, as described above. At this time, the common control device 9 must monitor the status of the subscriber 1 and, when the subscriber 1 goes on-hook, stop transmitting the howler sound and execute the release process. For this reason, in the howler sound transmission trunk 6, after the connection with the subscriber 1 is completed, the state of the subscriber 1 is monitored by the A relay, and the information is transferred to the common control device 9 via the scanning device 8 at the contact point a. In other words, the common control device 9 receives the information that was monitored by the monitoring circuit 3 in the subscriber circuit 2 before the howler sound transmission connection, and thereafter receives the information that was monitored by the A relay in the howler sound transmission trunk 6. receive. Even in a series of exchange service processing for monitoring the status of the same subscriber, it is necessary to change the monitoring device along with the change in connection type. An object of the present invention is to provide a subscriber circuit with a subscriber status monitoring function.

To provide an economical subscriber monitoring method that does not complicate processing in a common control device when switching subscribers from a subscriber circuit in a telephone exchange system to provide telephone services such as testing or howling sound transmission. It is about providing. In other words, the common control device monitors the subscriber only for the subscriber circuit, and in a telephone service where the subscriber circuit is switched, a circuit is provided that uses the switching circuit to transmit the status of the subscriber to the subscriber circuit. It is an object of the present invention to provide a more economical subscriber monitoring method that is easier to process. In order to achieve such an object, the present invention provides a telephone switching system having a subscriber status monitoring function in the subscriber circuit, and in a connection for switching the subscriber from the monitoring circuit and supplying telephone services such as testing or howling sound transmission. A switching circuit that switches the subscriber line on both the subscriber side and the subscriber circuit side and connects it to equipment compatible with various services, and within the equipment there is a 7J0 subscriber state monitoring circuit on the switched subscriber side, and a The subscriber status detected by the monitoring circuit is transmitted to the subscriber circuit on the circuit side. A common control device that is provided with a circuit to reach the subscriber circuit and requires information on subscriber status is characterized in that it receives information from the subscriber circuit even after switching the subscriber circuit.

Next, an embodiment of the present invention will be described with reference to FIG.

Referring to FIG. 2, one embodiment of the present invention is operated by a common control device 9 when transmitting one and two tones to the monitoring circuit 3 and the subscriber 1 in order to monitor the status of the subscriber. A contact point Ti of a switching relay T (not shown) is connected to a subscriber circuit 2 provided for switching on the inlet side and for switching on the subscriber circuit side, and connecting this subscriber circuit 2 and the howler sound transmission trunk 6. It includes a connecting test link 5, a howler sound output trunk 6 with a howler sound source 7, a subscriber monitoring relay A and its contacts a, and a scanning device 8 for transferring subscriber status information to a common control device 9.

In FIG. 2, the cross between the contact point t and the test link 5? Although the number of contacts is increased by two in each case compared to the conventional example shown in FIG. 1, as is well known, even if the number of contacts increases from two to four in the same relay, there is almost no economic impact.

In the well-known subscriber lockout state, the common control device 9 closes the contact t in the subscriber circuit 2 in order to transmit a howler sound to the subscriber 1, and further closes the test link 5 to connect to the subscriber 1. Connect the howler sound transmission trunk 6. The rehauling sound from the howler sound source 1 is sent to the subscriber 1 via the test trunk 5 and the contact point t. When the subscriber 1 is in an off-hook state, the A relay in the howler sound sending track 6 operates via the contact t on the subscriber side, and when the contact a closes, the current limiting resistor and the subscriber circuit side are activated. A rube signal (equivalent to the subscriber off-hook signal) is transmitted to the monitoring circuit 3 in the subscriber circuit 2 via the contact t. That is, the common control device 9 can receive the off-hook information of the subscriber 1 from the monitoring circuit 3 via the scanning device 8 even after switching the subscriber circuit. When subscriber 1 goes on-hook, the A relay is restored and contact a is opened, so the monitoring circuit 3 detects the on-hook, and the common control device 9 receives the on-hook signal from the monitoring circuit 3 via the scanning device 8 and sends the on-hook signal to each device. is restored and release processing is performed. In the embodiment shown in Fig. 2, the telephone service in the case of howler sound transmission has been described. However, it is possible to provide the subscriber monitoring system of the present invention with similar information transmission. As explained above, the present invention utilizes the same switching circuit even after switching a subscriber circuit having a subscriber state monitoring function from the subscriber to acquire monitoring information from a device connected to the subscriber after switching. By adopting a configuration in which the information is transmitted to the subscriber circuit, it is possible to perform easier and more economical subscriber monitoring.

[Brief explanation of the drawing]

FIG. 1 is a connection diagram showing an embodiment of a conventional subscriber monitoring system, and FIG. 2 is a connection diagram showing an embodiment of the present invention. 1...Subscriber, 2...Subscriber circuit, 3
...Subscriber status monitoring circuit, 4...Telephone network, 5...Test link, 6
... Howler sound transmission trunk, 7 ... Howler sound source, 8 ... Scanning device, 9 ...
・Common control device, A...Subscriber status monitoring relay in the howler sound sending trunk, a...Contact of A relay, t...Switching relay in the subscriber circuit.

Claims (1)

[Claims] 1. In a telephone system that has subscriber status monitoring means in the subscriber circuit, when switching the subscriber from the monitoring means and connecting to supply telephone services such as testing or howling sound transmission, the subscriber line must be connected to the subscriber side. A switching circuit connects the subscriber circuit side to devices compatible with various services, a subscriber state monitoring means on the switched subscriber side, and a subscriber state monitoring means detected by the monitoring means on the subscriber circuit side. A subscriber monitoring system characterized in that a common control device that requires subscriber status information is provided with a means for transmitting information to the circuit so that the information can be received from the subscriber circuit even after the subscriber circuit is switched. .