DE973649C - Circuit arrangement for telephone extension systems with inquiry switchings and signaling to the extension officer - Google Patents

Description

ISSUED APRIL 21, 1960

S 43234 Villa / 21a ^z

has been named as the inventor

The invention relates to a circuit arrangement for telephone private branch exchanges Inquiry switchings and signaling to the extension officer. For such arrangements it is already known to initiate the inquiry by repeatedly pressing the key, while for the Flicker signaling only requires a single keystroke, or it is through one-time Pressing the key initiates the inquiry switchover and pressing the key three times the signal for the extension officer switched on. In these arrangements, increased attention is required Participants required so that the desired switching process is actually initiated. One wrong number of keystrokes or a delay between individual keystrokes easily lead to unwanted switchovers.

It is also known to use long, time-limited keystrokes to initiate signaling Initiate subsidiary officer. A thermal relay in conjunction with an auxiliary relay is used for control used, so that at a relatively high cost due to the temperature dependency different switching times are unavoidable.

90Ϊ 764/1

It is also known per se, by connecting a capacitor in parallel to a relay To achieve drop-out delay.

The invention aims to avoid the disadvantages of known arrangements by simple means. This is achieved by pressing and holding the button on the microphone unit in the discharge circuit of a capacitor kept energized relay is brought to waste and ίο switches on a signal for the extension officer regardless of the further key press on the intercom.

An exemplary embodiment of the invention is shown in the drawing. When there is an incoming or outgoing connection via the line leading to the office, the feed bridge relay S ^{1 is} energized. There is a loop for the outgoing trunk via contact ι s and throttle Dr ι. Relay V ι is switched on by relay 5 ^1:

I. +, 2S, Vl, -.

The relay FLi is switched on by relay Vi:

2. +, 3 ^ i, 4 * i, IFLi, -.

The relay Ti is switched on:

3. +, 8 »i, Ti, -.

The following holding circuit is established for the relay FL ι:

4. +, 5 * i, 6x, TfIi, HFLi, -.

The relay Ti opens the excitation circuit 2 of the relay FL at contact 4 * 1. Relay FL 2 is switched on by relay FLi:

5. +, 5 * i, gas, lofli, iix, IFL2, -.

The relay FL2 now establishes the charging circuit of the capacitor in the following way:

6. +, 5 * 1, 6x, 7fix, 12/72, W12, C, -.

To initiate the inquiry, the participant briefly presses the earthing button. The differential relay X in the supply circuit is excited. At contact 6 χ the holding circuit 4 of the relay FL1 and the charging circuit 6 of the capacitor C are interrupted. The relay FL1 is kept energized in the discharge circuit of the capacitor C via contact 12 // 2. Relay Y is switched on when the key is pressed:

7. +, 5 * i, gas, lofli, 13 // 2, 14s, IY, χζχ, -.

The relay Y responds. Via contact 163; and resistor Wi 1, a holding bridge of the trunk line is established. By opening the contacts 183 // 193 / and closing the contacts 2031/2137, the switchover to the inquiry line RL takes place. A circuit for relays Z and Y is prepared at contact 22 y.

If the button "is released after a short time", the differential relay X drops out. The holding circuit 4 of the relay FL 1 and the charging circuit 6 of the capacitor C are restored. After opening the contact 15 χ , the relays Z and Y are switched on in the following way:

8. +, Sii, gas, το fix, ilfl2, 140, IY, UY, IZ, 22 y, .—.

The relay Z is energized. By opening contact 14 z and closing contact 23 s, the following holding circuit exists for relays Z and Y:

9. +, 5 * i, gas, lofli, 13/72, 23s, HZ, HF, IZ, 223 ;, -.

To switch back from the inquiry line RL to the exchange line, once the inquiry connection has ended, only a short press of the button is required. Relay X responds when the button is pressed and short-circuits winding II of relay Y and winding I of relay Z via contact 15 χ. Relay Y drops out. The following holding circuit now exists for relay Z:

10. +, 5ii, gas, lofli, 13 // 2, 23s, HZ, x $ x, -. _8s

If the relay X drops out after the button is released, the holding circuit 10 of the relay Z is interrupted. When relay Y drops out , the return line from the inquiry line RL to the exchange line takes place.

The subscriber wishes during an existing connection, a Flackerzeichen Office for official extension turn, the participant has press zn about 2 seconds, the button. When the button is pressed, the holding circuit 4 of the relay FL 1 is interrupted. The relay FLi is kept energized in the discharge circuit of the capacitor C. The discharge of the capacitor C and thus the holding of the relay FLi can be regulated by the resistor Wi 2 in such a way that a uniform fall time of the relay FL 1 is ensured at all times.

When the button is pressed and the differential relay X responds, the holding circuit 5 of the relay FL 2 is interrupted. The following holding circuit exists for the FL 2 relay when the button is pressed:

11. +, 5 * 1, 24 *, 25 / Z2, IIFL2, -.

If the relay FL1 drops out after the discharge time of the capacitor C , the lamp AL is switched on in the following circuit:

12. +, AL, 260s, 27 ga, 28 * 1, 29/71, breaker FLa, -.

A ticker is connected to winding III of transformer Ü via contacts 30/71 and 31 * 1 and is transmitted inductively to windings I, II. Opening contact 32 fl 1 prevents the ticker from being transmitted to the outgoing exchange line. After perceiving the ticker, the participant can release the button. The differential relay X drops out. At contact 24 λ? the 12g holding circuit 11 of the relay FL 2 is interrupted.

The relay FL 2 also drops out. When the relay FL 2 drops out, the following charging circuit of the capacitor C exists:

13. +, 34 // 2, Wia, C, -.

In this switching state, no excitation circuit can be established for the relay FL ι. The relay FL ι remains at rest, and thus the lamp AL in the circuit 12 remains switched on.

The officer connects to the exchange line by pressing the corresponding office key AT. The AS relay is energized. The following circuit is now established for the relay FL ι:

14. +, 33 as, Hi ⁷ Li, -.

The lamp AL is switched off by opening contact 26 as. When the relay FL 1 responds, the holding circuit 4 of the relay FL 1 is re-established. The relay FL 2 is switched on in circuit 5. The charging circuit 13 is interrupted at contact 34 // 2. The charging circuit 6 now exists for the capacitor C.

If the officer switches off from the exchange line, the relay AS returns to the rest position. The excitation circuit 14 of the relay FL 1 is interrupted at the contact 33 as. There is holding circuit 4 for relay FL ι.

If the flickering signal has been switched on and the officer does not answer for any reason, the participant who caused the flickering signal to be switched on has the option of extinguishing the flickering signal. This is done by briefly pressing a button. By pressing this button after the flickering signal has been switched on, the FLi relay is switched on in the following way:

15. +, 5 * 1, 2 $ x, S4fl2, IFLi, ■ -.

After releasing the button, and thus decrease in the differential relay, the relay X FLi is switched in the holding circuit. 4 Circuit 5 is closed for relay FL 2. The lamp AL switched on in circuit 12 is switched off at contact 29 // 1. The same state is thus established that existed before the flicker signal was switched on.

If the feed bridge relay 5 "is brought to drop when the connection is terminated, the relay Vi is switched off at contact 2 s . By opening contact 8 ν ι , the circuit of relay T 1 is interrupted. At contact 5 1 1, the holding circuit 4 of the Relay FL 1 and the excitation circuit 5 of relay FL 2. The capacitor C is switched on in the charging circuit 13. The devices that are being used are thus in the rest position.

Claims (5)

Patent claims: 1. Circuit arrangement for telephone extension systems with inquiry switching by briefly pressing a button and signaling to the branch officer by long pressing the button at the station, characterized in that when the button is pressed, a capacitor (C) charged in a low-resistance charging circuit via a relay (FLi) connected in parallel to it when occupied ) is discharged, which with the drop after the discharge of the capacitor (C) turns on the signal (AL) of the branch office officer regardless of further keystrokes on the branch. 2. Circuit arrangement according to claim i, characterized in that after the drop in the relay (FLi) held in the discharge circuit of the capacitor (C), the inquiry switchover also initiated with the push of a button is canceled (at the contact lofli). 3. Circuit arrangement according to claim 1, characterized in that an auxiliary relay (FL 2) is energized when the button is pressed, which after completion of the button press an excitation circuit for the condensation 'Sator discharge held relay (FLi) prepared. 4. A circuit arrangement according to claim 3, characterized in that the circuit of the relay (FLi) held by the capacitor discharge, which is prepared after the end of the keystroke, is switched on by pressing the key again and the signal switch for the extension officer interrupts. 5. Circuit arrangement according to claim 1, characterized in that by connecting the branch officer to the connection path, the relay (FL 1) brought to waste after the capacitor discharge is switched on again. Considered publications:
German Patent Nos. 587031, 596941, 894; R. Führer, »Fundamentals of Telephony technology «, 19-51. 1 sheet of drawings & 609 550/174 T. (909 764/1 '4.60)