DE967405C - Circuit arrangement to prevent unauthorized connections in telephone systems with dialer operation, especially for private branch exchanges - Google Patents

Description

ISSUED NOVEMBER 7, 1957

S 41748 VIII aj 2i a ³

has been named as the inventor

for private branch exchanges

In telephone systems with dialer operation, it is known to prevent a follower by Participants can establish a connection in a traffic direction that is blocked for them.

In a known arrangement, when a two-digit blocking code is selected, "0" is the second Place prevents the follower from causing more than ten electric surges forming the second series of electric surges is set.

The sending of more than ten power surges can be done by the calling subscriber by fast Pulling the number switch or by pressing the hook switch initiated with the intention be able to get a connection in a traffic direction that is blocked for him. To The last (eleventh, twelfth or following) current impulse of the second row is recorded with the known Arrangement triggered again by a blocking relay of the partially established connection path.

In the case of two-digit codes with »o <> in the first place, the second digit (e.g. 4) only indicates the direction of traffic that is blocked for certain subscribers. If you dial the number "o" , no block may yet take place. Any necessary blocking is only prepared.

The object of the present invention is to prevent the further establishment of each connection if more than ten current impulses are recorded as the first series of current impulses in the case of two-digit code numbers with an "o", thus one participant

705751/7

wanted to try this way, a blocked for him, but only after dialing the second code number The direction of traffic indicated by the code can still be reached.

In a known circuit, when more than ten current surges are emitted in one Row a follower shut down by the tenth power surge after cessation. Is the recorded Current impulse series is the last to be sent out when a ίο code number is selected and is the one selected thereby Direction of traffic blocked for the calling subscriber, takes place after it takes effect of the last (ii., 12th, etc.) current surge in this series the separation of the established connection path. Is the recorded series of impulses but the first to be sent out when choosing a multi-digit code and is thereby the traffic direction in which the connection is to be established has not yet been determined, so takes place after the last (11th, 12th, etc.) Electricity surge is not yet blocked. Only when a subsequent series of rushes is one for the calling If the participant indicates blocked traffic direction, the block will take place. Is the last code number the corresponding code an »o« and the calling subscriber sends more again than ten electric shocks in a row, only ten electric shocks become the follower again and only after the last current impulse has been received, the blocking starts. With this arrangement is always the connection dialer that is used to block the call for the calling subscriber Traffic direction is reached, set. The invention now shows a way which at extensive avoidance of special aids and bypassing a blocking by broadcasting without unnecessary setting of connection dialers of more than ten power surges in a row without additional and unwanted blocking marking prevented.

The invention is characterized in that the circuit for the locking relay on the Locking point following contact of the locking follower depending on the switching position of the locking point relay and the relay controlled during the initiation of a series of impulses effectively switched on will.

Without setting a connection selector via which a blocked traffic direction can be reached can, the establishment of an unauthorized connection is prevented at a point in time at which the code corresponding to the blocked traffic direction has not yet been fully selected. A two-digit code number within the meaning of the invention can also be a partial number of a multi-digit code number e.g. the first or second half of a four-digit code, i.e. the partial numbers 06 for 0604 or 04. If there are more than ten power surges at the first Scelle effective, the blocking follows immediately. If the third party sends more than ten power surges, the blocking takes place at this stage of the connection establishment. In all cases there will be a blocking carried out prior to the hiring of the last elector who carried out the elimination of traffic.

It should also be noted that it is known per se when more current surges are received in a row than it is necessary to identify the corresponding digit of a multi-digit code Selector disconnecting relay via the bank contact following the relevant identification contact to be addressed.

In the drawing 'is an embodiment of the Invention "shown. Only the circuits and absolutely necessary for understanding the invention Switching means are illustrated.

After an exchange connection has been identified in any arbitrary manner, the calling subscriber is connected to a free exchange line. It is assumed that an exchange dialer AW ⁸ <> of an exchange line AL available for use has set itself on the calling subscriber line. In the Teimehmerschaltung the isolating relay T responds in the usual way, while the Arirufrelais R remains addressed by current flow through its winding II. After switching through the speech wires irri Office voters the feeding bridge relay A to talk and are by closing the contact ι α the call appealing to the office on. The contact yes is opened. By closing the contact 2 a, the relay C is switched on.

(1) +, 2 ", -,! IC, 4", ML position 0.5 ", 6, -.

Relay C 'prepares its own at contact 8c Holding circuit through the high resistor 9 before. Relay C remains addressed via this circuit, when the follower is switched from its rest position. Closing the contacts ioc and nc has no effect at the moment.

It is assumed that the subscriber is not authorized to use connections in one traffic direction the code 04.

First, consider the case ^ that the participant sends £ wei surge rows of ten and four current surges. When relay ^ drops for the first time, relay F responds:

(2) +, ioc, 7 ", IV, UV, - .

Relay V short-circuits its winding I at contact i2i> and receives a drop-out delay. Contacts \ v, 13 »are opened, contacts τ ^ ν and 15 υ are closed. At the same time, the follower ML is advanced, because each time the relay A drops out, the rotary magnet Dms is switched on.

(3) +, ioc, ja, i6sp, Dms ,. -.

After the ten current surges have been received, the switch arm of the follower is on the Raxo latching point contact. Since no more power surges

run in, that falls after a while; Relay Y off. The relay U responds:

IC

The resistance g is dimensioned such that it does not prevent the relay U from responding. Bas relay U switches its holding winding II at the contact

ίο xju ein.-It also opens the contact «, i8w, τψι, 2OU and closes the contacts 21 ti, 22 u.

The next series of electric shocks with four electric shocks is picked up by the follower and at the same time passed on to the office. The follower is switched to position 14. After the relay V drops out, the relay Sp responds:

(5) +, 2 ", -; IIC,

4v, ML / 14, 2-1 u, Sp, 22 u

The relay Sp opens the contact z ^ sp. In the subscriber circuit, the relay R first drops out, while the relay T still keeps its armature attracted. In a known manner, the interception status is established on the subscriber line, the connection via the exchange line is released.

If the subscriber sends out a series of five or six current impulses in the second place and he is authorized to make connections in traffic directions with the code numbers 05 or 06, the relay Sp cannot respond when the switch arm of the follower reaches the bank contact 14. The contact 14 ν is closed, but the contact 20 μ is open.

If the subscriber tries to get a connection in the traffic direction 04 blocked for him by first sending out a series of impulses with more than ten current impulses, the blocking relay Sp speaks via the bank contact Ra 10

directly downstream bank contact 11.

(6) +, 24, 20M, 14 ", ML / ii, i8u, Sp, igu, 151; -.

Opening the contact 23 sp triggers the partially established connection path

initiated. The interception state is established on the subscriber line.

The blocking therefore takes place at a time when the connection dialer, via which the into the Traffic direction 04 outgoing lines can be reached, not yet assigned and set.

If the traffic direction 0604 is blocked for the participants, they will be blocked on the eleventh Bank contact of the follower if the participant has more than ten electrical impulses as the first series of electrical impulses sends out or on the twenty-seventh bank contact reached by + 6 + 11 = 27 current surges, if the third party sends out more than ten electrical surges. In the latter case it is the The partial code consisting of the third and fourth digits of the code is the two-digit blocking code within the meaning of the invention.

Claims (2)

Patent claims: i. Circuit arrangement to prevent unauthorized connections in telephone systems with dialer operation, in particular for private branch exchanges, characterized in that the circuit for the locking relay (Sp) via the contact (Ra 11) of the locking follower (ML) following the locking point (Ra 10) depending on the switching position of the The latching relay (U) and the relay (V) controlled during the recording of a series of impulses are effectively switched on. 2. Circuit arrangement according to claim 1, characterized in that when the follower is set on the Ra.ststellenkontakt (Ra 10) a relay (! 7) responds, which closes the circuit for the blocking relay (Sp) when the follower ( ML) prevented by a second series of current impulses via the contact (11) downstream of the latching contact (20 u). Considered publications:
German Patent No. 759,355;
German patent application D 11900 Villa / 21 a ³ .; Swiss patent no.210932. 1 sheet of drawings © 509 660/208 2.56 (709 751/7 10. 57)