DE677042C - Interception circuit to determine the caller in public teletype networks - Google Patents

Description

Interception circuit to determine the caller in public teletype networks In public teletype networks, in which the connected subscribers by means of Dial can establish connections with other connected participants, is used to check whether the desired connection has actually been achieved, in a pause in transmission by pressing the «Wer da» key the namesake of the selected Participant triggered; the called subscriber can also press his "Who there" button to find out who called him. The connection can be through both Participants are triggered. The participants in the public telex network are connected by two wires.

A two-wire circuit has the peculiarity that the namesake of one The subscriber who is currently writing cannot be triggered by his partner. So z. B. a participant who is called and harassed by another participant or is insulted, not by the namesake identify the caller, and the Callers can disappear undetected if they finish their text immediately presses his close button.

In the telephone operation can be repeatedly harassed at the request of a An interception circuit can be built into the participant. Adopting the principle of this Interception in the telex traffic is because of the fundamentally different structure teletype not possible.

According to the invention, it is proposed to the called annoyed subscriber to give a special key through which he means, a relay set in his Office, bypassing its selection, an alternating current or its uninterrupted working text sending facility. to its outgoing §endead -he switches and so deprives the caller of the opportunity to disconnect him so hold on.

An exemplary embodiment is given in the figure. Herein mean: A the annoyed subscriber, B the disruptive subscriber, Z 'addition at the subscriber, Z2 and Z3 the additions in the exchange, Sp spring writer, FT catch button, FG remote control device with closing button, STl at the subscriber, cal, bi connecting lines between office and Subscriber A, ST2 trigger button of the interception circuit in the exchange, G and F relay of the interception set, Rh replica resistor, TB telegraph battery, WB voter battery, VW preselector, S a signaling device.

The G relay is a differential relay which does not respond when the participant writes. If a called subscriber A now wants to prevent the connection from being released and to identify subscriber B, A presses the FT key. As a result, A interrupts the subscriber line and grounds the bl wire. The G relay now responds via earth, FT, bl-wire, ST2, G3-G ¢, g111, fl and 1-TB, from the VW. The G relay cancels the short circuit for F with g111, F responds in the same way and remains after releasing the catch button FT via + TB from the VW, F relay, G3-G4, ST2, bl-wire, FT, ST ', Sp, send contact, al-Ader, Gl-G2, fv, - TB. By bypassing the VW circuit, the flill_Kontakt z. B. alternating current of 25 Hz or continuously given text to the b2 wire that leads to subscriber B. In the VW circuit of subscriber B, his transmitter relay now works through the 25 Hz; this deprives him of the opportunity to send further messages and somehow release the connection. In the office of the annoyed subscriber A, a signaling device S is switched on via the f1112 contact, which notifies the office staff and requests them to track the connection and to identify the interferer B.

The interception circuit is activated after subscriber B has been determined Pressing the final key ST2 triggered in the exchange and stands for more Ready to be used by the same participant.

If FT in A is accidentally actuated, the subscriber can make the Fangschaltuntg ineffective by pressing his closing key ST1, because this causes F to be de-energized and the status of normal activation is established; As is well known, the STl key is used for subscribers who are not on the capture circuit to break the connection, that is, to activate it.

To give the subscriber at least the outgoing traffic during the determination of subscriber B, a switch to another VW can be provided will.

Claims (1)

PATENT CLAIMS: i. Interception circuit to determine the caller in public telex networks, characterized in that by the called Subscriber (A) provided switching means (Z1, FT key) in the Vernüttlungsstelle Additional devices (Z2, Z3) are activated by continuously sending of interference characters (through Z3), e.g. B. AC current of z5 Hz, the activation of the Prevent calling party (B). a. Circuit arrangement according to Claim i, characterized in that that as an addition .at the subscriber an interruption and earthing point and in the office a differential switched relay (G) and a delayed releasing relay (F) are switched on in such a way that the G relay is effective when the line is grounded (in Z1) becomes, whereby through contacts of (F) both an alarm device (S) and the Jammer source (Z3) must be operated. 3. Circuit arrangement according to claim i and a, characterized in that erft either by the jammer (Z3) or by switching off the signal order (S) either mechanically or electrically the disturbed subscriber (A) is switched off and placed on a different VW arrangement.