DE905030C - Circuit arrangement for telex switching systems - Google Patents

Description

In telex technology, the switching office to switching office or from the switching office Lines leading to the amplifier office, which can be long-distance or local lines, in each case on End terminated by relay transmitter. Apart from the high cost of switching means the distortion of the system increases, because for each polarized relay in the line there is one gives some distortion. With the numerous, in one established connection. lying relay transformers these distortions add up. In addition, the numerous transfer relays are the reason for many disturbances in transmission. The aim is therefore to reduce the number of relay transformers available to belittle. One possibility for this arises particularly in the case of short line sections where For transmission reasons, amplification by relays is not necessary, d. H. at Local lines, exchange circuits or, for example, connecting lines between a central office and the repeater office.

For this purpose, according to the invention, the transmission relays are located in the course of an exchange arranged relay transmitter during the connection establishment in the transmission paths and control the establishment of the connection, but are responsible for the transmission of the current steps after it is terminated ineffective. During writing, there is no galvanic separation of the individual line sections, so that distortions are caused by them Relays can no longer occur. Even if the windings of the transmission relays in the telegraph route remain, they can be dimensioned so that there are none in the short line sections

high damping results. The relays need im. the rest do not meet the requirements of a telegraph relay, but only need the call and to transmit voting impulses.

The invention is to be based on FIGS. 1 to 4 in more detail explained. Further advantages of the invention are explained in more detail in the description of the individual figures pointed out.

The figures show the invention in its application in a self-connecting switching circuit. Be it noted that the invention in no way applies to self-termination switches is limited, but with the same advantages for manually operated telex switching devices can be used. In the drawings (Fig. 1 to 4) are only those switching means listed which are necessary for an understanding of the invention. All further Circuit elements that are known per se have been omitted in order to simplify the circuit diagrams not to bother.

Fig. Ι shows a known circuit arrangement in which the lines through to the office Relay transmissions are complete;

Fig. 2 shows a circuit arrangement corresponding to FIG. 1 in its basic features, in which the Contacts of the termination relays are switched off during the write operation;

Fig. 3 shows a further embodiment of the

Invention in which the transmission relays are connected in parallel to the telegraph paths and in which the Voters can be controlled indirectly via polarized selector relays;

Fig. 4 shows a further embodiment of the invention, in which special for the voter pulse relay Control paths are created.

In the known circuit according to FIG. 1, the characters come from a sub-office, not shown, to the main office shown. The characters arrive at relay transmission I with termination relay Bx, which is initially controlled by the dialing pulses. When an occupancy occurs (isolating current), the armature b χ places it in the isolating layer, causing the R i relay to respond. The now following elective current impulses reach the impulse relay Jx of the first group selector. The group selector GWl checks for a free second group selector GPFII, with the pulse relay / 1 of the set group selector GPFI being separated from the α wire by a contact φ χ of the test relay Px. The group selector GWII is set in the same way by the next series of pulses. The further series of impulses are then sent to the transmission circuit (A 2 relay) and from there via the «contact via the exchange connection line A VL to the next exchange. Fig. 2 shows a circuit corresponding to FIG. 1 in its basic features, in which the transfer relay B χ is connected in parallel to the wires. During the reception of the election current surges, the received pulses are given in the manner considered so far from the δι-contact via the switchover contact mi to the group selector GWI Cable line the transfer relay A 2 is switched. After reaching the desired participant, positive current arrives via the reverse connection direction. The J? 2 relay of transmission II places its armature δ 2 to plus and returns the separating current to the calling subscriber via the «2 contact. In the office of the calling subscriber, the counting initiation relay of the time zone counter is switched on to the & wires at the group selector GPFI (not shown), which is now controlled by the & 2 contact of relay transmission II. During transmission II, the Ä2 relay causes the changeover relay U to drop out with a delay. This is done in the following way: If plus comes from the calling subscriber via the «wires to the A 2 relay of transmission II, the contact« 2 switches this relay to plus, whereby the M 2 relay is made to respond Contacts »2 opens. If positive current comes back from the called subscriber, the δ 2 contact of transmission II causes the i? 2 relay to respond, whose r 2 contact also opens. This interrupts the circuit for the delayed dropping ί / 2 relay, whose contact 112 switches through the δ wire from the called party to the caller. Now the A i relay also receives I plus current during the transmission, which causes the M i relay to respond. The mi-contact opens, and the di-relay of the transmission I is brought to fall with a delay, since the contact r n had already opened when the δ i-contact was first switched and the subsequent response of the R i-relay. When the iJi relay is de-energized, its u i contact switches the «wires through. There are now no relay transmissions that terminate any line sections either in the-wire or in the δ-wire. Only the j4 relays remain looped into the «or δ wire with their windings. Distortions caused by these relays are not possible with this type of connection.

The connection is released in a known manner by means of continuous signal current output, with the release of the relay Rx of the outgoing occupied transmission I, the c-wire of the group selector GPFI being disconnected. When the J? Relay drops out, the contact rii is closed and the U i relay is activated again. The contact u χ is switched back to the b i contact. Now, when the transmissions are now free again, the relays B are switched on again for the next assignment in the telegraph circuits.

In Fig. 3, the transmission relays A, B are connected in parallel to the telegraph wires. The dialing pulses come from the subscriber to the relay Bx as well as via the «-wires, the closed contact p χ at the first group selector GPFI to the polarized pulse relay Jx, which closes its contact ix iao when negative current surges occur and thereby closes the relay influencing the voter Jx ' to respond.

If the group selector GPFI checks for a free group selector GPFII, then the P i relay is made to respond, which opens its contact j> x. The next series of pulses goes to the group selector

in the same way. The other series of impulses go to the remote subscriber via transmission II. Here the .4 2 relay is excited in transmission II and the ilf2 relay is excited or de-excited according to the character of the characters. In the reverse transmission direction, no relays are looped in either, so that the write traffic can be carried out without intermediate relay transmissions via the a and δ wires.

In FIG. 4, the polarized pulse relays that are used in the circuit according to FIG. 3 can be saved, since special control paths are created for the voter pulse relays as a result of the insertion of a ά-ΑΔ & τ. In this case, however, additional voter arms and contact banks are required. When an occupancy (isolating current) arrives via the α-wire, the .B-relay connected in parallel to this wire puts the δ-contact in the separating layer and thus the relay R 1 to respond

so brought. The dialing impulses are now sent via the aVAder to the impulse relay / 'of the first Group voter. The connection is established in the manner described above. Here, too, lies in No relay termination in the course of the telegraph routes.

The final signal output in FIGS. 3 and 4 takes place in a known manner in that the λ relay is de-excited with continuous signal current and the test circuit (c-wire) through the opening r-contact is separated.

Claims (6)

Patent claims: i. Circuit arrangement for teleprinter exchanges, characterized in that the relay relays (.4, B or /) of the relay transmitters arranged in the course of an exchange are in the transmission paths while the connection is being established and control the establishment of the connection, but for the transmission after its termination (entering the write state) the current steps become ineffective. 2. Circuit arrangement according to claim 1, characterized in that the windings of the transmitter relays (A, B) are in the telegraph wires or in a branch thereof and that their contacts (a, b) are ineffective for the transmission of the characters when the write state occurs. 3. Circuit arrangement according to claim 1 or 2, characterized in that the windings of the transmitter relay (B) arranged at the input of the transmitter are located in a branch of the telegraph wire, while the transmitter relay (A) arranged at the output of the transmitter are in the telegraph wire itself (Fig . 2). 4. Circuit arrangement according to claim 2, characterized in that the contacts (b) of the transmitter relays (B) are switched off by the switching relay (E /) when the connection is completed by the telegraph wire (α wire) (Fig. 2) . 5. Circuit arrangement according to claim 1, characterized in that the telegraph wires polarized pulse receiving relays (/) receiving elective surges connected in parallel which control the voters via further switching means (/ ') and after the end of the voting process switched off by the telegraph wires via switching means (P) located in the test wire (c wire) (Fig. 3). 6. Circuit arrangement according to claim 4, characterized in that the switching means controlling the voters (/ ') are influenced by the contact (b) of the transfer relay (B) via an additional control path (i-wire) (Fig. 4). Referred publications:
German patent specification No. 655 202. For this purpose 2 sheets of drawings © 5782 2.54