DE1167379B - Circuit arrangement for switching a teleprinter connection operated between two message memories to the exchange of messages between two privileged subscribers - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Class: H 041

Number:
File number:
Registration date:
Display day:

German KL: 21 al -5/02

St 17821 VIII a / 21 al

May 16, 1961

April 9, 1964

In order to temporarily use an existing telex stand-alone connection for other purposes, for example for Transfer of booking orders and confirmations for passenger seats, to be able to use them, priority switches are required at both ends of this permanent connection.

The object of the invention is to create an arrangement which makes it possible to use a telex line or a teletype channel of a stand connection at any time as appropriate to the character to activate for a privileged connection and after the end of occupancy to the non-privileged connection To switch back the telex network automatically. "Appropriate to the sign" is to be understood as meaning that a changeover does not occur while a telex code is being sent, but only after completion this sign takes place. This is achieved according to the invention in that switching means are used with the occupancy signal of the preferred transmitting station initiate the deactivation of the transmitter of the assigned, non-privileged teleprinter, after Shutting down the said transmitter by further switching means to the switch assigned to the preferred receiving point, a first switchover signal is sent, the duration of which is that of a norma-Ien Teletype including the start step and its maximum duration is only limited by the »line interruption« criterion, in the aforementioned switch by the switchover signal Switching means become effective, which switch off the transmitter of the switch assigned to this switch, initiate non-privileged telex and through the to that of the privileged A second switch signal of the same type as the first switchover is sent back further switching means are provided in the switch assigned to the preferred transmitting station, which record and evaluate the second switchover signal after the end of the second switchover signal further switching means in both switches simultaneously enable the switchover to the preferred transmission or Carry out the receiving point and the triggering signal in both points makes the triggering switch effective which initiate the switch back to the normal teletype network.

In a further embodiment of the invention, a delay device for the reception of the switchover signal is provided in each of the switches, which is designed in such a way that it only becomes effective after the duration provided for a character combination including the start step during the time required for a stop step and thus the Circuit arrangement for switching a
operated between two message stores
Teletype connection to the exchange of messages between two privileged ones
Participants

Applicant :.

Standard Elektrik Lorenz Aktiengesellschaft,
Stuttgart-Zuffenhausen, Hellmuth-Hirth-Str. 42

Named as inventor:

Paul Finkbeiner, Eßlingen / Neckar,

Harro Hafemeister, Korntal (Württ.)

Limitation of the switching signal transmitted to the unauthorized receiver to approximately the length of the character stream the telex combination 32 causes. This avoids false characters that would inevitably arise if the character current pulse used for switching purposes was in full Length is given to the recipient of the non-privileged teleprinter.

The invention is explained in more detail using a simplified exemplary embodiment. Among other things are the reset windings of the telegraph relays and those to prevent character distortion and means for adjusting various flows have not been shown.

The drawing shows the circuit arrangement for the priority switches ÜA and ÜZ, which allow the preferential shared use of a four-wire permanent connection StV for booking purposes. The names of the corresponding devices and switching elements on both ends of the StV permanent connection differ only in the letters "A" or "Z" at the last position in a row of letters. A punched tape transmitter SA or SZ and a chart recorder EA or EZ are connected to the two priority switches for duplex telex traffic. A telegraph relay ASA or ASZ is located in each of the transmission circles of the perforated tape transmitter SA and SZ; the incoming telex characters are picked up by the telegraph relay BlA or SlZ. In addition to the EMA or EMZ receiving magnet of the recorder EA or EZ, the contact bla or blz controls the telegraph relay B2tA or B3Z and thereby the

409 558/180

delay device VA or VZ, which, however, is not effective with normal telex characters, the maximum character stream length of which is given by the combination 32.

The booking point on the periphery of a booking network is connected to the BA entrance of the ÜA priority switch and the central booking office is connected to the BZ input of the ÜZ priority switch. A short occupancy pulse (e.g. 30 ms) received by the AKA telegraph relay causes the priority switch ÜA to be occupied and thus initiates the switchover to booking mode.

The contact akal causes the relay ANA to respond, which is maintained via the contact ana 2 , prepares the connection of the relay STA with the contact ana 3 and causes the relay KA to respond via the contact ana 4. After the occupancy pulse has ended, the AKA telegraph relay drops out again. The relay STA is energized via the returned contact aka 2 and the closed contact ana 3, which closes its holding circuit with the contact stai. This relay interrupts with the contact sta 3 the holding circuit for the relay ANA and at the same time with the contact stal the start circuit for the perforated tape transmitter SA. The relay ANA is delayed to such an extent that the transmission of a telex character that has just started by the punched tape transmitter SA is not interrupted by the contact anal . Only after the end of such a teletype does the relay ANA drop out, which with its contact anal opens the loop to the telegraph relay BlZ and at the same time with the contact ana 4 opens the circuit for the relay KA. The relay KA is, indicated by the capacitor lying parallel to its winding across the contact &<2 2, with a drop-out delay and forms with the contact kai a switchover pulse analogous to the drop-out delay, the duration of which exceeds that of a normal telex and the maximum duration of which is only determined by the criterion » Line interruption «is limited (e.g. 300 ms). The contact b Iz of the telegraph relay SlZ, which is thereby controlled in the character position, transmits the switchover pulse to the chart recorder EZ and via the telegraph relay B3Z with its contact 63z to the delay device VZ. This is such that it only becomes effective after the duration provided for a character combination including the start step during the duration provided for a stop step (e.g. between 140 and 150 ms for the five-digit code used here).

When the delay device VZ takes effect, the relay HZ responds, which limits the switching pulse to the chart recorder EZ with the contact AzI so that it is not influenced by the combination of characters 32 formed, and which allows the relay ETZ to respond via the contact hz 2. The relay ETZ maintains itself via the contact etwork 3, are connected to the contact Etzl the contact access code 1 for the booking operation dates and switched to the contact etz2 the drop-out delay relay ANZ a, the via contact, the relay Disp4 KZ and over the contact Disp3 and the contact hz 3, which is closed again after the end of the switching pulse, causes the relay STZ to pick up. The relay STZ with the contact stz4 interrupts the circuit for the relay ANZ, which is delayed for the duration of a normal telex, and with the contact stzl disconnects the start circuit for the perforated tape transmitter SZ , so that only the teletype currently in progress is sent.

After the drop of the relay ANZ ÜA becomes the priority Soft sent back a conditional by the drop-out delay of the relay KZ switching pulse (contact KZL), which is just like the first switching pulse is evaluated there in the priority switch TS, so that here too the chart recorder EA with the aid of the delay means VA receives a corresponding partial impulse and when contact eta 1 opens, the sender contact aka 1 is released for booking operations.

Once sent from the priority switch TS to override Soft ÜA switching pulse is over, talk in the priority Soft ÜA the relay UA over the returned to the separating layer contact b 3a, the contact among others 3, the closed contact eta 2 and in the priority Soft ÜZ the relay IP over the returned contact kz3, the contact uz3 and the closed contact stz 3 at the same time. With the contacts «al, uzl, the sheet recorders EA, EZ are separated from the contacts b 1 a, blz at the same time on both sides. The telegraph relays B2A , BlZ released by opening the contacts ua2, uz2 can now take over the telegraph characters of the booking telegrams from the receiving relays BIA, BlZ.

In the priority switch ÜZ , contact uz 5 also closes the loop of the writing circle to the booking center and switches it on. The telex station connection is thus integrated into the booking network, and an exchange of messages between the booking office and the booking center is now possible.

The triggering and switching back of the facilities to normal teletype operation is carried out caused by an impulse sent by the booking center that has a longer duration than that of a telex character. This impulse is received in both priority switches and evaluated.

The contacts akz3, b2a2 switch on the circuits for the relays ABZ, ABA , which - indicated by a capacitor connected in parallel to them and a resistor in series with them - are delayed and only after the duration required for a character combination including the start step speak to. In the priority switch ÜZ, the relays ETZ and UZ drop one after the other after the trigger pulse has ended . With the contact uz 1, the sheet recorder EZ and then after the drop-out of the delayed relay STZ with the contact stzl the punched tape transmitter SZ are included again in the teletype network. The same processes take place simultaneously in the priority switch ÜA. Any interrupted teletype operation will now be continued without mutilating.

Claims (3)

Patent claims: 1. Circuit arrangement for switching between two message memories operated Teleprinter connection to the exchange of messages between two privileged partial by means of priority switches arranged at the ends of the permanent connection, thereby marked that a) initiate the deactivation of the transmitter (SA) of the assigned, non-privileged teleprinter with the occupancy signal of the preferred transmitting station (BA) switching means (AKA, ANA, STA), b) after the said transmitter has been shut down by further switching means (KA) to the switch (ÜZ) assigned to the preferred receiving point, a first switchover signal is sent, the duration of which exceeds that of a normal teletype character including the start step and the maximum duration of which is only determined by the criterion »line interruption« is limited c) in the mentioned switch by the switching signal switching means (B1Z, B3Z, HZ, _ao ETZ, ANZ, STZ, KZ) become effective, which initiate the deactivation of the transmitter (SZ) of the non-authorized teleprinting station assigned to this switch and through the to the a second switchover signal of the same type as the first is sent back to the switch (ÜA) assigned to the preferred transmitting station, d) further switching means (B IA, B3A, HA, ETA) are provided in the switch (ÜA) assigned to the preferred transmission point, which record and evaluate the second switchover signal, e) after the end of the second switchover signal, further switching means (UZ, BlZ or UA, B2A) simultaneously switch to the preferred sending or receiving point in both switches, f) by the trigger signal in both switches trigger switching means (ABZ, ABA) become effective, which initiate the switch back to the normal teleprinter network. 2. Circuit arrangement according to claim 1, characterized in that a delay device (VA, VZ) is provided in each of the switches for receiving the switching signal, which is such that it is only after the duration provided for a character combination including the start step during the The time required for a stop step becomes effective and thus limits the switchover signal transmitted to the non-privileged receiver (EA or EZ) to approximately the length of the character stream of the teletype combination 32. 3. Circuit arrangement according to claim 1 or 2, characterized in that, in dependence on the release switching means in both switches, first the receiver and then the transmitter of the non-authorized teleprinter stations are switched on at the same time. 1 sheet of drawings 409 558/180 3.64 © Bundesdruckerei Berlin