DE724387C - 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 and DC alarm clocks at the subscriber stations.

Such a structure have z. B. small house telephones, so-called home telephones.

The invention is based on the object of such small systems as possible to make it economical. For this reason, the one at the subscriber station provided direct current alarm clock included in the circuit structure of the preselection stage, in such a way that it has the starting circuit of the with the subscriber line associated preselector or preselection organ that visits the subscriber line Contacts actuated.

The contact dominating the starting circuit can be a special one Contact of the DC alarm clock or its breaker contact.

It is already known to use an alarm clock to make contact, z. B. to interrupt a local signal circuit to the rhythm of the alarm clock.

The drawing shows an exemplary embodiment of the subject matter of the invention shown. The invention is not restricted to the exemplary embodiment. There are only the details necessary to understand the subject matter of the invention are shown been.

The subscriber station Tn can set up a connection to the main station HS of the system via the call finder AS, which is designed as a rotary selector and works as a dual mode selector. On the other hand, speech communication is possible in the opposite direction. The call finder AS is usually only provided once in such systems and can also be designed as a lever-operated rotary selector. In larger systems, preselectors are provided in the preselection stage, which reach group selectors, i. The participant Tib establishes an outgoing connection. If the subscriber Tit picks up the receiver and presses the T button to call the main unit HS, the following circuit for the starting relay G, which is provided for the subscribers and can be reached by other subscribers via lines 2 and 3, is established: Earth , Battery, winding of relay G, contact mainly of the alarm clock [I%, subscriber key T, earth. By closing contact.I- the rotary magnetD of the AS is connected to the interrupter RU (via contacts 4g and 5p). The rotary magnet is advanced in this circuit in a known manner and therefore switches the arms a; b, c of the AS until the line q. calling subscriber line marked on the switch arm c of the selector is reached. The participant has the instruction to press the button for about 1 second so that the AS is activated when the button is released. Then the relay P responds in the following circuits: earth, battery, winding of the relay P, contact 9p, which is designed as a drag contact, Schaltarmc, line 4, Kontaktiw, subscriber station, button T, earth. The relay P interrupts the rotating magnetic circuit through contact 5 p and is maintained via contact 9 p and the closed contact 25 b, the relay Bi is not shown. Depending on the relay B, which responds after the button T is released, it also responds. Relay B has responded in the following circuit: earth, battery, contacts 8b, 6p, switch arm, alarm clock W, subscriber loop, switch arm a, winding I of relay B, earth. After relay B1 has responded and contact 25 b1 has opened, relay P continues via contact iib. The subscriber station Tia is now switched through to the main station HS. The call lamp appears on the main unit in a familiar manner.

The relay B has actuated the drag contact 8 b, 7 b. As a result, the following circuit exists during the call: earth, battery, winding II of relay B, contacts 7b, 6p, switching arm b of the AS, winding of the alarm clock 9 ', subscriber loop, switching arm a of the AS, winding I of relay B, earth. Relay B remains in this circuit, and after relay P has responded and contact 6p has closed, alarm clock W has opened its contact and thus the starting circuit for the voter, so that there is no longer any derivation on the subscriber loop. When the subscriber Tia hangs up the receiver, the holding circuit for relay B is disconnected, and relay B drops out, while alarm clock 117 closes the starting circuit again. 2. The main office HS calls the subscriber Tü. If the main unit HS lifts the receiver, the following circuit is closed for the relay A: earth, battery, winding 1I of relay A, loop over main unit HS, winding I of relay A, earth. The relay Ä serves as an impulse relay and, when it is triggered for the first time, via contact i4.a, causes the relay I ', which is designed as a delay relay and is maintained in a known manner over a series of impulses, to respond. The pulse circuit for the rotary magnet 'D is closed via contact 15v, and contact 16a pulses in this circuit. Then the rotary magnet D and consequently the call seeker AS is controlled on the desired subscriber line, in this case on the line of the subscriber T it. As a control, the lamp of the desired participant can light up for the point HS. The point HS calls the subscriber Tr in a known manner. A relay RF, not shown, is actuated and closes the contact 2orf. The relay P now responds in the following local current circuit: earth, battery, winding of the relay P, contact 2o rf, resistance Wi, earth, and is again connected to earth via contact 9p and the now closed contact ioa. Since contact 6 p is closed, there is the following circuit for the alarm clock W: Earth, battery, contacts 8 b, 6p, switch arm b of the AS, alarm clock W, alarm clock breaker contact iw, line q., Switch arm c of the AS, contact 2orf, resistance Wi , Earth. In this circuit, the alarm clock W is interrupted by its break contact iw and rings. If the participant answers, the alarm clock is switched to a direct current circuit again, as described under point i, and the interrupter contact iw remains open, so that the starting line is again disconnected from the participant loop during the call.

This means that both incoming and outgoing traffic will through the alarm clock contact, which is also the breaker contact of the alarm clock, the Event line disconnected from the subscriber loop.

Claims (1)

PATENT CLAIMS: i. Circuit arrangement for telephone systems with dialer operation, characterized in that a direct current alarm clock (W) provided at the subscriber station actuates the starting circuit of the preselector (preselector or caller) controlling contacts (iw) connected to the subscriber line or calling up the subscriber line. z. Circuit arrangement according to Claim i, characterized in that the interrupter contact (iw) of the direct current alarm clock (W) is located in the starting circuit of the preselection element (AS). 3. Circuit arrangement according to claims i and z, characterized in that when the call status is created for the subscriber station, the direct current alarm clock (W) assigned to it is switched into a direct current circuit bypassing the interrupter contact (iw) of the alarm clock.