DE1141345B - Circuit arrangement for telephone systems with dialer operation, especially telephone extension systems, with devices for releasing permitted and blocking non-permitted office connections - Google Patents

Description

Circuit arrangement for telephone systems with voter operation, in particular telephone extension systems, with devices for releasing permitted and blocking non-permitted exchange connections Connection can be set up in a traffic direction that is blocked for this telephone station.

In known arrangements, the deficiency can occur between the device monitoring the number current impulse (blocking follow-up mechanism) and the Number surge receivers, via which the connection path is established, no synchronism exists, which means that proper monitoring of the impulse current is not guaranteed is. It can e.g. B. the subscriber establishing a connection immediately after occupancy the monitoring device, but before a number is switched on: shock receiver, by pressing the fork contacts (knocking down the fork) a short impulse send that only the monitoring device a compared to the first in r Connection path lying number surge receiver other, setting there, and thus the subscriber station setting up the connection can per se be blocked marked connection route must be accessible.

In order to more effectively monitor the rush current, i. H. a synchronism from the monitoring device and number current surge receiver, can still be reached known by switching operations that take effect when the monitoring arrangement is occupied a forwarding of the power surges sent by the calling subscriber station and influencing the switching device provided for their evaluation (follow-up mechanism) until a dialing facility (exchange group dialer) that accepts number bursts is provided to prevent. In this way, a time security is achieved to the trunk selection and a subsequent trunk group dialer ready to receive power to turn on, but it can happen that during the reversal, free choice and subsequent test times of the trunk group dialer a short impulse (e.g. by Pressing the fork contact) is sent, which is not the public line dialer, but the monitoring device advances, whereby the required synchronization the monitoring device with the impulse receiver following in the connection path is canceled during the further number impulse.

Telephone connection numbers with twelve or more digits however, it is not always necessary to only use the first or second digit manufacturable connection device - to be blocked for certain road users, but it can block the connection at any point of the Set the port number. The known arrangements do not avoid the possibility the production of unauthorized connections, in which z. B. only after. the third or another digit to block the connection direction, and by additional unauthorized impulses the release of a blocked Connection direction are brought about.

It continues to prevent unauthorized connections from being made known, the evaluation of encoder pulses that are too short that are not used to set a Office voter, but sufficient to continue the locking follow-up mechanism, thereby to influence that the pulses through the switching means assigned to the follow-up mechanism be checked for length. If the impulses are too short, i. H. for those that do not come close to the normal pulse in length, trigger switching means effective.

The invention is based on the object between: the individual Number pulse series to ensure that the monitoring device is synchronized with the respective subsequent surge receiver in the connection path remain, if there is an additional pulse, the length of which also corresponds to the normal pulse can be sent.

According to the invention, this is achieved in that switching means of the monitoring device simulate the permissible reversing, free selection and test times of the surge receivers of the connection path and the pulse evaluation is prevented by this switching means in the event of an impulse (including normal pulses) from the subscriber station establishing the connection during these times.

The drawing shows an exemplary embodiment relating to private branch exchanges of the inventive idea shown, which is not directly for explanation elements and circuit arrangements of a monitoring device necessary for this idea, which can be selector or relay controlled are not shown.

The official transmission AUe is assigned the monitoring device Spmw, which, among other things, includes the relays B, J, H; T, V I, V 2, it is indicated that the relay T by opening its contact 3 t opens the separation line TrLtg in, the office transmission AUe when unauthorized exchange connections are set up and thus initiates the triggering of the connection path established up to now and contact 1 t interrupts the line leading to the office. Without affecting the concept of the invention, the establishment of a connection that is not permitted can also be prevented by short-circuiting the speech wires through contacts of the relay T, the relay J of the locking follower mechanism receiving the pulses. Spmw is disabled.

After the exchange code has been sent to the subscriber station, the relay A responds in the exchange transmission AUe in a known manner. The contact 1 a prepares the loop closure before, and the contact 3 a closes the circuit for relay J of the monitoring device Spmw via other contacts. Contact 2a switches on relay C in circuit 1. -f-, 2 a, C, Wi 1, - . While the contact 1c prepares ground potential to the monitoring device Spmw, the contact 2c has the relay. V in circuit 2: -I-, 2c, V, C, Wil, - switched on, whose contact v closes the office loop. In a known manner, the relay C remains switched on during the assignment of the trunk transmission. When relay J responds for the first time, the following circuit is established for relay B: 3. -I-, 1 c, 1 h, 4 i, B, -.

The relay B is energized and continues to hold itself when the contact 4i opens via its own contact 2b. The contact 1b prepares ground to a further arrangement of the monitoring device Spmw.

The contact 3 a controls the relay J in time with the impulses of the subscriber station establishing the connection. Here, the arrangement is such that the rush receiving relay J is caused to drop in pulses when the subscriber station receives pulses and is kept excited via contact 3 a after each series of pulses. At the first drop of relay J at the beginning. of the first pulse, relay V 1 in circuit 4. -I-, lb, 1v2, V l, Wi 2, -switched on, which remains energized in this circuit via its own contact 1 v 1, which is arranged parallel to contact 1v2 when the relay V 2 is excited via its winding I by actuating the contact 3 v 1 and the contact 1 v 2 is open. The charge of the capacitor of the time measuring means Ko, Wi 3 of the relay V 2 remains after the excitation of the relay V 2 via the circuit 5. -I-, 3v1, V 2 (II), 3v2, Ko, W13, - . Contact 4v2 (in working position) is parallel to contact 1h, so that even after relay V2 has responded, whose contact 5v2 switches on relay H in circuit 6. -f-, lc, 5v2, H, -relay B remains in working position. With known, not shown means of the relay B, the relay is kept energized during the impulse transmission of a call number. Relay H continues through its own contact: 7. -f-, 1c, lh, H, -. For the concept of the invention, the switching state of the arrangement is significant, which is given after the termination of the first pulse and thus also after the termination of a series of pulses that corresponds to a ringing number. Here, the contact 21 short-circuits the winding of the relay V 1, which drops out so quickly that the setting of the respective surge receiver has not yet started in the office-side dialing device. There. Relay V 2 is still kept energized; the circuit of the relay V 1 is separated by contact 1v2, so that it cannot be excited by the contact 21 until the relay V 2 has returned to its rest position and the short circuit is canceled.

The contacts 1 v 1, 2 v 1, 3 v 1 return to their rest position. Though the circuit for relay V 2 is interrupted by contact 3 v 1, but holds the relay uses its own contact 3v2 for one more time using the time measurement means Ko, Wi 3 fixed time. The duration of the delayed waste is calculated in such a way that that the reversal, price selection and testing processes of the respective office facilities are secure can be terminated.

Now, during this setting time of the surge receiving devices of the respective public office level, an additional, short impulse. Sent by the subscriber station, relay J drops out, and contact 21 closes a circuit B for relay T -f-, 1b, 2i, 2v2, 2v1, T, -.

The relay is energized and remains on its own contact 2 t after relay J has picked up and relay V 2 has dropped in circuit 9. -I-, 2h, 2t, T, -.

The contact 1 t separates the speech wires, the contact 3 t initiates the release of the exchange transmission A Ue and thus the separation of the subscriber station from the exchange line.

After the relay T responds, relay H is counter-excited via a further winding, not shown, so that the contacts 1 h and 2 h return to their starting position. Contact 2 h disconnects the holding circuit of relay T, and contact 1 h prepares a circuit for relay B.

The arrangement in the monitoring device Spmw is made such that the relay H responds again when the winding, not shown, is switched off if further monitoring of the subscriber pulses is no longer necessary. In this case, the contacts are in the working position again for 1 hour and 2 hours. The circuit for relay B is interrupted, and contact 1 b separates the earth from the monitoring relay V l, VZ, so that they can no longer be effective.

In. an embodiment shown in phantom shows a further solution which prevents the transmission and evaluation of the impulses from the subscriber station. Here, the contacts 6 v 2, 4 v 1 short the line leading to the office, while the following holding circuit is established for the relay J for the time of the delayed fall of the relay V 2: 10. -I-, 7 v 2, 5 v 1, J, -, which prevents the relay J from relaying pulses to the monitoring device Spmw and from sending pulses over the line leading to the office.

After the trunk transmission A Ue has been triggered, the relays C and A return to their rest position.

Claims (7)

'PATENT APPLICATION: 1. Circuit arrangement for telephone systems with dialer operation, in particular telephone extension systems, with devices for releasing permitted and blocking non-permitted exchange connections, characterized in that switching means (J, T, V 1, V 2) of the monitoring device (Spmw) monitor the permissible reversal , Simulate free selection and test times of the impulse receiver of the connection path (exchange dialer) and the pulse evaluation in the event of an impulse (also normal pulses) of the subscriber station establishing the connection during these times is prevented by this switching means (J, T, V1, V2) . 2. Circuit arrangement according to claim 1, characterized in that the switching means (V1, V2) are permissible Reversal, free selection and test times of the office-side surge receiver so for the monitoring device (Spmw) simulate during the monitoring time that the one switching means (V 1) before the start of the reversal of the respective surge receiver in the rest position and the other switching means (V2) still in the working position after the test process is. 3. Circuit arrangement according to claim 1 and 2, characterized in that the Switching means characterizing the beginning of the prevention of pulse evaluation (V1) the switching means (V2), which marks the end of the monitoring, switches on, the after the opening of its response circuit (through contact 3v1) via its own contact (3v2) comes to apostasy with a delay (through Ko, W13). 4. Circuit arrangement according to claim 1 and 2, characterized in that the relay (J) relaying the pulses for evaluation when the subscriber station receives pulses during the office-side reversal, free selection and testing processes a circuit via contacts of the monitoring switching means (2v2, 2v1) for the Switching means (T) completed (through contact 2a), which immediately initiates the release of the exchange transmission ( A Ue). 5. Circuit arrangement according to claim 4, characterized in that the switching means (T) is the trigger brought about by cutting a line. 6. Circuit arrangement according to claim 1 to 5, characterized in that the monitoring switching means (V1, V2) only become effective after the occupancy relay (B) has responded, after termination of the pulse series to be monitored by a monitoring device (Spmw) controlled relay (H) is switched ineffective (by contact 1 h). 7. Circuit arrangement according to claim 1, characterized in that during the setting and testing processes the office-side surge receiver sends an impulse to the office through a short circuit (6 v 2, 4 v 1) the line leading to the office and holding the relay (J) by the switching means (V1, V2) is prevented. Publications considered: German Auslegeschrift # 1069 209.