DE362266C - Circuit arrangement for telephone systems with main and subsidiary units - Google Patents

Description

Circuit arrangement for telephone systems with main and secondary units. The present invention relates to a further perfection of the patent 296oz5 protected circuit arrangement, especially for main and private branch exchanges is determined in which the private branch exchange station on the same line mail as well Conducts private calls, such as B. is the case with external extensions. In the known circuit arrangements of this type, the construction of the outgoing occurs and incoming connections in the same way. This is a different one Signaling of incoming and outgoing connections to the office impossible, what is particularly disturbing for the call of the extension to the office at local battery offices. This disadvantage is eliminated according to the invention in that each extension line in the main office an individual relay that can be influenced by an officer which initiates the connection process with an exchange line, during this process for incoming calls (from the exchange to the extension) a group relay is initiated. It is useful to use to influence the the extension assigned relay one for other measures, e.g. B. Listen in, already existing button or the like

An exemplary embodiment of the invention is shown schematically in the drawing shown, the Kontäkte of the relay except with the reference number still with a small letter to indicate belonging to the same Relays marked with capital letters are provided.

Each extension line is assigned a relay N on the main unit, which is influenced by the officer when the listening button MT is pressed. This relay N then initiates the connection process with the line leading to the office, which takes place in the manner described in patent specification 296o = 5. In the embodiment shown, a connection is established in the following way. If the extension Ni wants to make an outside call, it notifies the main office of this via the internal connection line. The officer at the main office then presses the MT button, which closes a circuit for relay N (earth, battery, winding I of relay N, contacts x, 2, winding II, earth). The relay N responds, and the potential is applied to the extension line at contact 6, which results in the setting of a selector W on this line. By closing of the contact 3, the common starter relay is energized, the q indirectly through a not shown selector manifold via contact. a circuit for the rotary magnet D of a free selector W closes (earth, battery, D, contacts 7, q., interrupter U, earth). In addition, the relay engages at 5. Potential at the c-arm of the selector W. As soon as this reaches the contact of the calling subscriber Ni, the relays P and T respond (earth, battery, 5, windings I and II of relay P, contact 8 of the disconnect button TYT, arm c, relay T, contact 9 of the extension button NT, 6, earth). The response of the relay P results in the opening of the contact 7, whereby the selector W is stopped. By closing contact 1q. the relay Pi is energized, which connects the exchange line to contacts = 5 and 16. Furthermore, the relay P is placed via the contact io in a holding circuit, which is completed as a result of the excitation of the feed relay S, closing of the contact ii.

The relay T is connected via the contact 12 in a holding circuit that is independent of the extension key NT and the relay N. Furthermore, by opening contacts 17 and 18, it switches off subscriber Ni from the line to the house control center and places him on the exchange line by closing contacts ig and 2o. Closing the contact 13 causes the signal lamp NBL to light up, which indicates to the officer that the extension is connected to the exchange line and that she can release the listening button MT.

By influencing the signal key ST at the subscriber station Ni, the winding I of a differential relay M is short-circuited. This responds as a result and, by closing contacts 21 and 22, places a ringing current source on the exchange line. The further production of the connection takes place in a known manner. The connection is disconnected after the handset has been attached to the subscriber station Ni and the de-energization of the relay S caused thereby as a result of the interruption of the holding circuit for the relays P and T at contact ii.

If the office wishes to speak to the extension Ni, the connection is established as follows: When the office calls * , the call relay A is activated and the contact 23 closes, via which the relay H is energized. This is placed in a holding circuit via contact 24. At the same time, the officer at the headquarters is informed in a known manner by a call signal of the request of the office and switches on by turning the speech switch SP into the exchange line. Relias F is excited (earth, battery F, contact 25, line 43, relay Be, earth) and switches off relay H at 26; Be opens contact 2 so that relay N cannot be energized. By closing the contact 27, a circuit for the relay E is prepared.

The officer queries the office and presses the extension key NT of the desired subscriber Ni. As a result, it switches on relay G1 via contact 31, which closes contact 30 and thus the circuit for relay E (earth, battery, E, 27, 28, 29, 30, earth). The relay E is connected to a holding circuit that is independent of the relay F via contact 32. By closing the contact 33, the rotary magnet D is again placed on the interrupter U, so that the selector W starts and adjusts to the line of the subscriber N1, which was identified by applying the potential earth at contact 36 of the extension button NT .

The relay E had also closed a circuit for the relay Z at contact 35 and placed a battery on the switch arm c of the selector W at contact 34, so that when it hit. of the switching arm c, the relays P and T respond to the test line of the called subscriber (earth, battery, 3q., P, 8, c, T, 36, earth). The energization of the relays P and T has the consequences described above.

The relay Z switches off the Rüfstromzufleitung at 39 and qo, so that a call to the office is not possible. It also closes a holding circuit at 37, which is completed at contact 38 of relay P, which is also excited when relay P is excited. At contact qq. the relay Z prepares a signal circuit with the lamp ML .

After resetting the speech switch SP, the conversation can be conducted. If the extension Ni wants to give a signal to the main station, it presses the ST key, which, as described above, causes the relay M to be energized. The relay M closes the circuit of the lamp ML at 41, so that the officer at the main office recognizes the request of the extension. The connection is terminated in a known manner.

Claims (2)

PATENT CLAIMS: i. Circuit arrangement for telephone systems according to Patent.296oi5 for systems with main and extension units, in which the extension makes both postal and private calls over the same line, characterized in that that every branch in the main office is given an individual one by a civil servant influencing relay (N) is assigned, which the connection process with a Initiates trunk line for outgoing connections (from the extension to the exchange), while with incoming calls (from the exchange to the extension) the connections through a group relay (Gx) can be initiated so that in both directions of conversation a different connection setup is achieved and thus a different type of connection Signaling to the office is made possible. 2. Circuit arrangement according to claim i, characterized characterized in that for switching on the relay (N) each such extension assigned listening key (PS) is used.