DE375952C - Circuit arrangement for the call facility of an intermediate amplifier office - Google Patents

Description

GERMAN EMPIRE

ISSUE ΑΜ22.ΜΑΠ923

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21 a GROUP 58

(S 56661

Siemens & Halske Akt-Ges. in Siemensstadt b. Berlin*).

Circuit arrangement for the call facility of a repeater office.

Patented in the German Empire on June 11, 1921.

The call _ of a repeater office is generally made in such a way that with longer Ringing current transmission a delay relay switches the intercom signal on. The order is made so that the relay to the exchange at the other end responds first,

and depending on this the delay relay for the interception signal is switched on. With every call to the intermediate office the office at the other end is also called unintentionally.

According to the invention, this disadvantage is

* J The patentsitcher named the following as the inventor:

Dr.-Ing. August Engeihardt in Berlin ~ Halensee.

£ 75952

by eliminating the fact that the further call depending on the delay relay only during one a certain period of time after cessation of only a short ringing current is possible during if the ringing current is given for a longer period of time, only the call is made in the intermediate exchange. It becomes this through it can be achieved that the delay relay is connected upstream of the continuation relay in the switching path is and sequentially ίο controls two contacts, one of which in the event of a short ringing current after it has ceased, the continuation relay switches on while the later activated the de-energization of the delay relay and thus the call relay causes. A local relay dependent on the ringing current causes the call to be longer The continuation relay does not respond, but the inter-exchange call signal.

An example circuit arrangement for carrying out the invention is shown in the drawing illustrated. This circuit works like this:

The ringing current coming from the long- distance line O actuates the AC relay .Rf ₁ in the intermediate office and this the local relay Z ₁ ; Via its contact 1, the delay relay F _{1 is} excited, which relocates its contacts in the order indicated by the numbers 1, 2, 3. Contact 1 holds the relay regardless of Z ₁ , until contact 3 after a certain time, e.g. B. 4 seconds, interrupts the holding circuit. Contact 2 also responds at a specified time before contact 3, if e.g. B. the delay for contact 3 is 4 seconds, for contact 2 it can be 3 seconds; be.

If the ringing current transmission from O has ceased before contact F _{2 has} responded, Z _{1 is} de-excited and contact Z ₁ , ₂ assumes the position shown in the drawing. By '. Closing contact 2 of the delay! relay F ₁ thus receives the further call relay i? ₂ . Current and switches the ringing current source of the ' intermediate exchange to the long- distance line W. This further call lasts until contact 3 of F ₁ interrupts its holding circuit, so that contact F ₂ opens again. The further call to W thus always takes one second in the present example, regardless of the remote officer in the eastern end office.

Should, however, the inter-exchange receive a call, the call must Endamtsbeamtin seconds longer than, Z _x is thus energized and conse- \ whose folded be changeover contact 2 when contact 2 closes F of ₁ to 3 seconds. The circuit of the relay R ₂ is not closed and it does not respond, so that there is no further call to the end office. In contrast, the inter- call relay A _{1 is} operated and the call lamp L ₁ lights up. A ₁ maintains its own contact until the officer of the intermediate office disconnects the holding circuit, for example by pressing the T ₁ key. 4 seconds after the start of the process, contact 3 disconnects from F ₁ , its holding circuit, so that it drops out when the ringing current output from O, Rf ₁ and Z _{1 is} de-excited when the ringing current is stopped. The contacts of Z ₁ are to be set so that 1 falls back a little earlier than 2. F ₁ must in fact fall off, its contact 2 must be open before contact 2 of Z ₁ returns to the rest position, otherwise the relay A ₂ would be an unintentional one Get power surge.

Claims (4)

Patent Claims: 1. Circuit arrangement for the call facility of a repeater office, characterized in that the call relay of the intermediate exchange by a short Rufstromgabe of the calling office is switched on for the purpose of calling the end office for a certain period of time, while with longer Rufstromgabe the Call facility of the intermediate office is put into action. 2. Circuit arrangement according to claim 1, characterized in that a delay relay go (F) with consecutively working contacts (2, 3) is energized before the call relay (R), which causes the call relay to respond and determines its duration of excitation. 3. Circuit arrangement according to claim 1 and 2, characterized by a relay (Z ₁ ), which is indirectly actuated by the ringing current output, which causes the excitation of the delay relay (F) via a contact (1) and via a changeover contact (2) either the circuit of the The continuation relay (i? ₂ ) or the call relay (A ₁ ) of the repeater office closes. 4. Circuit arrangement according to claim 1 to 3, characterized in that the contacts (1, 2) of the local relay (Z ₁ ) work one after the other in order to prevent the relay relay from responding inadvertently. 1 sheet of drawings.