DE711746C - Circuit arrangement for telephone systems with dialer operation - Google Patents

Description

Circuit arrangement for telephone systems with dialer operation The present The invention relates to a circuit arrangement for telephone systems with dialer operation, where a call state is transmitted by a temporary incentive and localized no later than the checking of the preselection organ calling up the calling line is maintained. Its purpose is to prevent such a temporary transfer relatively long connecting lines or connecting lines, which as a result bad condition does not allow DC operation, as well but the calling station has the possibility of triggering the call from the moment the call is made from grant.

In contrast to arrangements in which by actuating an inductor such transmission and establishment of a local circuit is initiated and be2 those of the local circuit only after it has been switched through to the downstream Facilities or after a civil servant joins the connection to the cancellation arrives, in the present arrangement, the introduction and transmission of the Call incentives to create a local circuit are also made using alternating current can be made, but the cancellation of the established local circuit by the calling party at any time from the moment the connection is initiated from can be undone.

This is achieved by the fact that when making the initiation of a Connection required switching measures on the part of the calling point switching means Bring out an induction shock of a certain direction, through the one Winding of the call receiving relay lying with a second winding on the connecting lead wires is switched on in a local circuit, while not done for all Calling on the part of the calling party by sending out an induction shock from the opposite side Direction, which is also from the winding lying on the connection line cores of the incoming call relay is picked up, the incoming call relay is canceled of the local circuit is de-excited.

The arrangement according to the invention creates an operationally reliable System using normally designed switching elements, which also meets the operating conditions set for a modern system.

According to the further invention allows the induction surges generating Facility also sends out following the actuation of the dial Induction current surges without the forced emission of induction surges opposite direction disturbed when initiating and renouncing a connection will.

In the drawing, an embodiment of the invention is shown, however, to which this is not limited. With Tn there is a subscriber station at which a connection is initiated by picking up the receiver. The contacts operated by the hook switch are designated with Hu, the when picking up the receiver, the other way round. With an H there is one at the subscriber station Applied device referred to, which is used to generate induction surges. This achieves a large range for the power surges, so that the Use of connecting lines in poor condition is made possible.

If the subscriber lifts his receiver at the subscriber station Ttz, the H.aken changeover contacts Hat, and Hat,> um-, e'_egt. By switching the hook switch contact Hit, the speech transmitter G and the remote receiver F are switched on with the alarm clock S switched off. By moving the hook switch contact Hit. the following circuit is established: negative pole of battery B, hook switch Hit ;, contact ttsa, which is only thrown when the dial is pressed, relay I (, contact 2 s, positive pole of battery B. Relay I (is energized and operates its contacts 3 k, q, k and 5 k. The winding 1 of the transformer Ti is connected to the battery B by means of contact lk 5 k later closes:) t than contact 4k. By flipping contact 3 k, relay S is switched on. This responds in the following circuit: positive pole of battery B, relay S, contact 3k, hook switch Hit "negative pole of battery B The contact opens the circuit for winding 1 of transformer Tr. This creates an induction surge in winding II of the transformer, which is transmitted from earth Ei via winding II of transformer Tr, contact 5 k, L Line La, winding I of the call receiving relay R, contact 8 t to earth F. runs. This rush current causes the call receiving relay R to respond, so that it flips over its contacts 6 r and 7 r . The following holding circuit is created for winding 1I of relay l2: Earth. Battery, winding II of relay R, contacts 6 r and q. t, starter relay on, earth. The contact 7 r identifies the calling line on the switching arm se of the indicated call seeker As. The relay Atz causes a free call seeker to be started in a manner known per se.

After addressing the relay S in the facility H was switched over of the contact i s the relay I (brought down by it in the following circuit short-circuited: contact i s, relay I (, contact ttsa, hook switch Hit- Contact i s. Relay I (sets contacts 3 k, q. K and 5 k back to rest position. The relay S is kept energized in the following circuit: Positive pole of battery B, relay S, resistor Wi, contact i s, negative pole of the battery B.

If the calling subscriber renounces the establishment of a call before the call seeker AS is switched through, the device H transmits an induction shock in the opposite direction when the handset is hung up, in that the following circuit is established when the hook switch contacts are switched to the rest position: positive pole of battery B, contact 2 s, hook switch Hu ,, contact usa, relay I (, contact is, negative pole of battery B. In this circuit, relay I (responds. Contact 5 k applies winding 1I of transformer Tr to line La . Der Contact 3 k shorts the relay S in the following circuit: positive pole of battery B, relay S, contact 3 k, hook switch Hu., Contact 2 s, positive pole of battery B. The relay S drops out of the transformer Tr provided excitation circuit at the contact is closed. This excitation of the winding I of the transformer Tr causes the transmission of an induction surge to the Wic klung I of the relay R. Since this surge came about by closing the circuit for winding I of the transformer Tr, this surge has an opposite current direction to the current surge that occurs when the connection is initiated by opening the circuit for winding I of the transformer Ti- has been sent. The relay R is therefore made to drop by counter magnetization. The contact 6 r is opened, so that the storage circuit, which ran through the winding 1I of the relay R, is canceled. The arrangement shown is now in the rest position.

It should also be mentioned that the subscriber station Ttt, also via two Cores can be connected to the exchange facility. In this case the Earth potentials are switched off at the points Ei and E. and - the points Ei and E. through a line can be connected.

The device H for generating the induction surges is also set up to emit N umernstromströmten. If the call seeker AS is set to the calling line after a connection has been initiated, the test relay P assigned to the call seeker is responded in a known manner. The relay T also responds, whereby the contacts 8 t and 9 t; open «> earth. The iot contact is closed and maintains the test circuit. In some way, not shown, the connection of a current surge receiving device takes place, which is influenced by the switching arms sa, sb of the call seeker. The calling subscriber does not receive an official signal.

When the connection was initiated, as already described, the winding I of the relay R was excited by an opening current surge of the transformer Fr. The relay S has been energized. If the participant now pulls out the dial at the point Tn, the contact nsa is closed. The relay I (is excited via the positive pole of the battery B, contacts 2 s, nsa, relay I (, contact is, negative pole of the battery. The relay I (actuates its contacts. A current impulse is not transmitted because the relay S is energized , so the contact is not in its rest position. If the dial expires, the contact nsa remains closed, while the contact nsi is actuated in bursts. When the contact rtsi closes, the following closing circuit is established for the winding I of the transformer Tr: positive pole of battery B, winding I of transformer Tr, current impulse contact nsi, hook switch hat, negative pole of battery B. This causes an induction current impulse to be emitted, followed by an induction impulse in the opposite direction when the contact nsi is opened accordingly from an opening current surge, so that if the connection is dispensed with when the receiver is hung up on the part hmerstelle: Tn a closing current surge occurs in the manner already described. This surge of current can be used to release the established connection in any known manner. After this closing current surge has been transmitted by the falling relay S, the relay I (also drops out. Since the contact 5 1z is opened earlier than the contact 4 k, a shock is transmitted when the relay I (drops out).

Claims (5)

PATENT CLAIMS: i. Circuit arrangement for telephone systems with Voter operations where a call state is transmitted by a temporary incentive and locally at the latest by the checking of the calling line Preselection organ is maintained, characterized in that when making the Switching measures required to initiate a connection on the part of the calling party Place (Tiz) switching means to emit an induction pulse in a certain direction bring through the one winding (R II) of the with a second winding (R I) The incoming call relay (R) lying on the connecting lead wires is switched on in a local circuit is carried out during all unfinished calls from the calling party Emission of an induction shock in the opposite direction, also from the winding (R I) of the call receiving relay lying on the connecting lead wires is included, the call receiving relay canceling the local circuit is de-energized. 2. Circuit arrangement nadh claim r, characterized in that the induction shock emitted by the calling station when a connection is initiated from a winding of the call receiving relay lying on the connecting lead wires (R I) is recorded, which also after recording the call incentive by a second, in: a local circuit winding of the call relay (R II) until it is switched through the connection line to downstream connection devices (e.g. AS) the influence of the connection line remains. 3. Circuit arrangement according to claim 2, characterized in that when de-energized the lying on the connecting line Winding (R I) of the call receiving relay also the local circuit for the second winding (R II) of the relay is opened. 4. Circuit arrangement according to claim r, characterized characterized in that the connection point has a wire and earth with which the induction surges receiving winding of the call receiving relay is connected. 5. Circuit arrangement according to claim i, characterized in that the emission of induction surges opposite direction when initiating and releasing a connection Device (H) is designed such that it is under the influence of the dial an induction current impulse via the outgoing lines. possible without the Inevitability of the emission of induction surges in the opposite direction to interfere with the initiation and release of the connection.