DE689716C - Circuit arrangement for monitoring conference traffic in telex switching systems - Google Patents

Description

Circuit arrangement for monitoring conference traffic in telex switching systems The well-known conference systems for teleprinters are switched in such a way that everyone Participants after notification of the office with a group of others Participants can enter into telex traffic. Now wanted one of the called Participant, an especially important one while receiving a broadcast and to deliver urgent news, so far he has had no way of doing this To announce office. In general, therefore, the participant concerned tried to force his separation from the conference group by writing back. Through this However, the incoming characters were distorted or incorrect for all participants recorded. Also malfunctions in one of the relay terminations assigned to the subscribers or on the subscriber lines had a similar effect. Responsibilities of the supervisor It was then the officials in the switching office to query the conference participants individually, to be able to determine the source of the disturbance. However, this is time consuming.

The invention overcomes these disadvantages and allows the type and location the disturbances-quick to recognize.

According to the invention, switching means are used in the telex exchange provided that when a called subscriber writes back during reception or in the event of faults occurring in the relay terminations assigned to the subscribers trigger an alarm signal, but in cases where -by the calling party important messages are sent. should, through one in the switching measure carried out by the exchange a non-disruptive transmission of characters to the other participants.

The invention is explained in more detail with reference to the figure: If a subscriber AT informs the office when interrogating that he wants a collective connection, the operator puts the connection plug of the subscriber in question into the one in question. Jack SaKl belonging to collective switching group. Then he puts the conference plugs St to St "in the jacks of the desired conference participants KT to KT". When the plug of the calling subscriber AT is inserted into the SaKI jack, the relay C _ is energized. As a result, the telegraph relays SR and UR are separated from + LB by the contact cl and connected to the calling subscriber via the subscriber pawl SaKl and the Sclinurpaar. When sending telegraph signals, the subscriber controls the relays SR and UR via the upper line connected to the cl contact with double current. When the start impulse (-) of each character arrives, the armature sr applies -ZB and thus energizes the relay D via the winding II. Due to the winding I, the D-relay has a drop-out delay so that it stays within a combination of characters even when positive pulses arrive. A brief shifting of the armature sr to + LB therefore does not result in any shifting of the d contacts. The contact sr sends plus and minus current pulses over the B line, r contact and closed e2 contact while the corresponding character combinations are being sent, and the connected conference participants receive the caller’s transmission.

When inserting the plug ST to ST "in the corresponding pawls of the participants, the E-relays are energized. Those in the rest position (positive current) Contacts of the transmission relays of the called subscribers cause an excitation in themselves of winding I of the H relay designed as a differential relay. Lock in the lt contact does not take place, however, because winding II of the H relay is in the opposite direction is excited.

If one of the called subscribers now wishes to send an important message during reception, the armature of the transmitter relay assigned to the subscriber is switched to the negative position when the counter-writing begins. This energizes winding I of the H relay in the opposite direction and closes the H contacts. Through the contact hl the monitoring lamp ÜL receives current from + OB via contact d4, line A, contact hl and earth. By closing the h2 contact, + LB is placed on the B line, contacts c, changeover contact ur and contact sr, so that positive current flows continuously over the B line and the recording of characters is interrupted for all called participants. At the same time, the safety lamp SLL -LB is connected to the contact sr. Since the winding I of the relay H is only excited when the current is negative, the lt contacts are opened and closed in the rhythm of the telegraph characters. The surveillance officer recognizes from the flickering of the surveillance lamp ÜL that one of the participants is writing back and wishes to be interrogated.

If the H-relay is not excited by telegraphic characters, but rather by malfunctions that have occurred in the relevant subscriber's associated relay terminations, then winding I of the H-relay will continuously receive negative current and the monitoring lamp ÜL will burn uninterruptedly when the h-contacts are closed. This indicates to the surveillance officer that there is a fault in the subscriber line concerned. In this case, the monitoring officer will pull the relevant plug ST and take the disturbed participant out of the conference.

If the sending subscriber AT stops writing, then the contact sr of the sending relay SR switches to the plus position, with relay D dropping out after the delay time has elapsed. The circuit for the opposite traffic direction to the calling subscriber AT is thus switched through. Now give the connected subscribers about the receipt in the reverse direction to the subscriber AT acknowledgment; so the H relay is energized. By closing the HL contact, however, the monitoring lamp ÜL is now not brought, since the contact d4 had opened when the D relay dropped out. By the telegraph character of the acknowledgment participant, the R-relay lying in series with the relay H is energized in the rhythm of the telegraph characters, and by the contact r positive or negative current impulses are given over the B-line to the receiving relay ER, which is its contact he moves it into the appropriate position and transmits the shipment in the rearward direction via the lower line, connected to the he contact and leading to the SaKI latch, to the subscriber receiving the receipt.

If a subscriber registers an important broadcast with the office that should not be disturbed by counter-writing from the connected subscriber, the monitoring officer presses the lock button SpT after the corresponding connections have been established. This will be for all participants. F relays which are jointly assigned to a collective switching group and which have contacts f1 and f2 in each of the circuits KT to KT "assigned to the subscribers, so that contact f1 closes, for example, in the transmission KT assigned to the subscriber connected via ST and causes a short circuit of the R-relay: At the same time the contact f2 opens there.If one of the called subscribers writes against the broadcast, the H-relay assigned to it is energized and the h-contacts are closed, but it can be over the contact As a result of the opening of the contact f2 caused by the relay F, for example, no permanent positive can be given via the B line, so that the outgoing transmission from the calling subscriber can be transmitted to the other subscribers undisturbed brought in front of the surveillance lamp, which indicates to the surveillance officer _. that the counter-writing participant washes to be interrogated.

Claims (1)

PATENT CLAIMS: i. Circuit arrangement for monitoring conference traffic in telex exchanges, thereby. characterized in that switching means (H, F) in the exchange when a called subscriber wrote back during of reception or in the relay terminations assigned to the subscribers Disturbances trigger an alarm signal, but in cases where by the calling party Subscriber (AT) important messages are to be sent by an in the switching action carried out by the exchange (pressing the SpT key) non-disruptive character transmission to the other participants is ensured. a. Circuit arrangement according to Claim i, characterized in that the switching means (Relay H) are assigned to each participant. 3. Circuit arrangement according to claim i and z, characterized in that the switching means assigned to the subscribers (Rela'is H) are designed as differential relays. ¢. Circuit arrangement according to Claim i to 3, characterized in that the switching means (relay H) only with Reception of character stream (minus current) take effect. 5. Circuit arrangement according to Claim i, characterized in that the switching means (relay F), which are a trouble-free Maintaining character transmission, assigned jointly to a group of participants are. 6. Circuit arrangement according to claim 5, characterized in that the one Switching means (relay F) assigned jointly to the participant group by actuation a key (SpT) to respond. 7. Circuit arrangement according to claim i, characterized in that assigned as an alarm signal to each of the participants Monitoring lamps are used. '