RU16638U1 - LOCKING DEVICE FOR SUBSCRIBER TELEPHONE LINE - Google Patents

Abstract

1. A device for blocking a subscriber telephone line, comprising an executive unit connected to a subscriber telephone line, characterized in that a start signal generating unit and a subscriber code generation unit are introduced, wherein the start signal generating unit is connected to the subscriber telephone line, the subscriber output of the start signal generating unit connected to the telephone sets of the subscriber, and the output of the start signal is connected to the start input of the executive unit, the output of the subscriber code request of which is connected n to request entry of the subscriber subscriber code generation unit codes whose output is connected to an input receiving subscriber code execution unit, subscriber validation code output which is connected to subscriber telephone linii.2. The device according to claim 1, characterized in that the subscriber code generation unit is configured as a reprogrammable element.

Description

LOCKING DEVICE FOR SUBSCRIBER TELEPHONE LINE

The utility model relates to telecommunications and

provides protection of the subscriber telephone line for any types of unauthorized connections

(parallel connection, connection when disconnected from the terminal device).

A known device system for protecting telephone lines (patent of the Russian Federation (19) RU (11) 2116005 (13) C1 (51) 6 H 04 M 1/68) containing an actuator unit, a threshold unit, a control unit and a pulse control unit. The executive unit does not shunt the subscriber line when dialing and in talk mode from the subscriber's telephone and shunts the subscriber line when dialing from the telephone connected in parallel to the subscriber line from the outside.

This device is the closest analogue of the proposed technical solution. However, the technical implementation of the known device is so complicated that it is difficult to provide the necessary reliability and low price of the device, and, most importantly, this device does not protect the telephone line during unauthorized connection to

IPC 6N 04 M 1/68

case disconnected from the terminal device.

The proposed solution is aimed at ensuring the protection of the subscriber telephone line during unauthorized connections both in case of parallel connection and when disconnecting from the terminal device while simplifying and reducing the cost of the blocking device of the subscriber telephone line.

This goal is achieved by the fact that a block for generating a start signal and a block for generating subscriber codes are introduced into the blocking device of the subscriber telephone line, comprising an executive unit connected to the subscriber telephone line. In this case, the start signal generating unit is connected to the subscriber telephone line, the subscriber output of the start signal generating unit is connected to the subscriber's telephones, and the start signal output is connected to the start input of the executive unit, the subscriber code request output of which is connected to the subscriber code request input of the subscriber code generating unit the output of which is connected to the input input of the subscriber code of the executive unit, the output of the verification of the subscriber code of which is connected to the subscriber telephone inii.

In addition, the subscriber code generation unit is designed as a reprogrammable element.

Distinctive features of the proposed device from the closest analogue are the introduction of the start signal generation unit and the subscriber code generation unit for their above purpose.

The block diagram shows a device for blocking a subscriber telephone line.

The proposed device comprises a unit 1 for generating a start signal, the input of which is connected to a subscriber telephone line, an executive unit 2 and a unit 3 for generating subscriber codes. The subscriber output of the start signal generating unit 1 is supplied to the subscriber's telephones, the start signal output of the start signal generating unit 1 is connected to the start input of the executive unit 2. The output of the executive unit 2 is connected to the subscriber telephone line through which the subscriber code is transmitted to the exchange. The output of the subscriber code request of the executive unit 2 is connected to the input of the request of the subscriber code of the subscriber code generation unit 3 to request the subscriber code, which is transmitted to the executive unit 2.

The operation of the proposed locking device for any type of unauthorized connections to the subscriber telephone line is as follows.

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while connecting to the called subscriber, this fact is fixed by the trigger signal generating unit 1, and a signal initiating the operation of the executive unit 2 is issued to the executive unit 2. The executive unit 2 requests the subscriber code from the subscriber code generating unit 3 and transmits the corresponding code combination by the subscriber telephone line on the telephone exchange. The subscriber code is a combination of several digits transmitted by tone dialing to the PBX according to code 2 of 8.

The PBX equipment for time-based recording of the cost of calls, to which the subscriber telephone line is connected, receives the subscriber code issued by the executive unit 2.

In the memory of the cost accounting equipment, combinations of subscription codes of all subscribers connected to it are recorded. Therefore, having accepted the code combination from the executive unit 2 and identified it with the code combinations recorded in the memory device, the cost accounting equipment “allows transmission of the station response signal (readiness buzzer) to the subscriber’s side, after which the subscriber starts dialing the telephone number of the called subscriber from the telephone set .

If an unauthorized connection to the telephone line of the telephone has occurred, then in

either the subscriber code will not be transmitted to the PBX or the wrong code will be transmitted that is recorded in the memory of the cost accounting equipment for this subscriber telephone line. Codes will not match, and an unauthorized connected telephone will not receive a “station answer.”

Block 3 of the formation of subscriber codes is intended for the primary formation of the subscriber code, and for changing it in agreement with the exchange, which is ensured by the implementation of this block as a reprogrammable element.

The technical implementation of all the units included in the proposed device is much simpler than the aforementioned analogue and protects against all types of unauthorized connections, while the aforementioned analogue does not protect the subscriber when connected to a subscriber telephone line in case of disconnection of the subscriber telephone line from terminal devices.

The executive unit, transmitting the subscriber code by tone dialing, is very simple, since the necessary microcircuits for this have already been developed and are widely used in modern telephone sets with tone dialing.

The usefulness of the proposed device is currently due to the fact that with the introduction on the city telephone networks of the Russian Federation, time-based cost accounting equipment for all types of connections (local,

intercity, international) will increase sharply the number of "people who want to talk at someone else's expense.

Various practical implementations of the proposed blocking device are possible for any types of unauthorized connections to the subscriber telephone line.

For example, the proposed device is produced in the form of a separate set-top box, to which a subscriber telephone line is connected, on the one hand, and the inputs of all telephone sets (main and parallel) in the apartment (office) on the other.

The use of such a set-top box will make it possible to connect ordinary telephone sets operated earlier in the apartment (office), while protecting the subscriber from all types of unauthorized connections of the telephone set to the subscriber telephone line.

The proposed device can be installed inside the newly developed and preparing for the release of modern telephones. Moreover, existing telephone sets can be used as parallel telephone sets.

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Claims (2)

1. A device for blocking a subscriber telephone line, comprising an executive unit connected to a subscriber telephone line, characterized in that a start signal generating unit and a subscriber code generation unit are introduced, wherein the start signal generating unit is connected to the subscriber telephone line, the subscriber output of the start signal generating unit connected to the telephone sets of the subscriber, and the output of the start signal is connected to the start input of the executive unit, the output of the subscriber code request of which is connected n to request entry of the subscriber subscriber code generation unit codes whose output is connected to an input receiving subscriber code execution unit, subscriber validation code output which is connected to the subscriber telephone line. 2. The device according to claim 1, characterized in that the subscriber code generation unit is configured as a reprogrammable item.