DE577224C - Circuit arrangement for two-wire connection traffic in telephone systems with dialer operation - Google Patents

Description

GERMAN EMPIRE

ISSUED ON June 10, 1933

REICH PATENT OFFICE

PATENT LETTERING

M 577224 CLASS 21a ³ GROUP 34a »

Mix & Genest Akt.-Ges. in Berlin-Schöneberg *)

with voter operation

Patented in the German Empire on July 24, 1930 '

If in telephone systems with dialer operation several exchanges via connecting lines are in communication with each other, in the interest of a cheap pipeline network, they are used especially where longer distances come into question, two-core connecting cables. With orders of this type, however, certain difficulties arise, e.g. B. result from this, that the "speech veins must be checked, otherwise the checking voter on outgoing end of the connection line is unable to occupy the line of the line at the incoming end. There is also the question of back release occupied lines difficult to solve.

The present invention makes in one embodiment (see figure) with a Arrangement known, which the above-identified difficulties in the way overcomes that at the ends of the connecting lines, assigned to them, in series with both wires switching means are arranged, which immediately when checking a voter on a ready-to-receive connection line in one as well as the dialing current surges symmetrical circuit running over both wires come into effect and remain energized until the connection is terminated. From the fact that this switching means the connecting lines are assigned directly, there is the particular advantage that there is z. B. possible these facilities to be installed subsequently and without changing the voting system from the three-wire Transferring connection traffic to two-wire traffic when there is a lack of line. The choking effect of this Switching means with reference to the speech streams is on the other hand (apart from the parallel-connected Capacitors) are suppressed by the fact that their two windings of these alternating currents are each in opposite directions Direction are traversed (differential circuit) and as a result of the speech currents only the ohmic resistance has to be overcome.

In the example shown in the figure, the two exchanges A, B are connected to one another by the two-wire connection line va \ vb. At the outgoing end in the exchange A , the group selector Gwa has access to the connecting line through the intermediary of the transmitter XJea, which ends at the incoming end in the exchange B via the transmitter JJeb on a group selector Gwb. Resistors are marked with W, capacitors with K and numbered consecutively. Relays are in capital letters, the associated contacts with the corresponding small letters

* l Voil · the patent seeker has been given as the inventor:

Arthur Mehlis in Berlin-Liehterfelde and Friedrich Rohns in Berlin,

Letters. The switching means in switching center A also have a second code letter a, those in switching center B have the code letter b. Further information regarding the function of the individual parts is occasionally given in the circuit description.

After the connection has been switched through from the calling station in the exchange A to the group selector Gwa, the contact ia ¹ , which is assigned to the impulse relay (not shown) of the calling station, is closed. The relay Va is also excited via: earth, ... (this indicates switching means which come into effect when the group selector Gwa is occupied), ka (head contact of the group selector Gwa), pa ³ , Va, -. The relay Va switches the relay Pa as a test relay to the c-arm of the group selector Gwa and prepares the circuit for the rotary magnet Da , which, after the group selector Gwa has been set to a specific row of contacts under the influence of the number impulse transmitter of the calling station ( not shown), over earth, ..., before, pa ² , δα, Da, - is closed. The group selector Gwa turns under the influence of the self- interrupter δα into the relevant row of contacts , and when a free connection line is encountered, the following test circuit is established: earth, va, high-resistance winding II of relay Pa, low-resistance winding I of relay Pa, ca-Ann of the group voter, Ca, resistance IV ^s , -. The relay Pa comes into effect, holds itself via its contact pa ¹ and at the same time blocks the connection line at the outgoing end against +5 further assignments by short-circuiting its high-resistance winding II. Furthermore, the circuit for the rotary magnet Da is interrupted at the contact pa , which is thereby shut down, and at the contact pe ³ the circuit for the relay Va, which drops out with a delay. Relay Ca also responds with a delay in the same test circuit. At the contacts pa ⁱ , pa ⁵ , the connection is switched through to the remote switching center B via the group selector Gwa . If the line is ready to receive at the incoming end, the following circuit is created: -, resistor W ¹ , ta ¹ , current branching:

Relay Za, winding I, pen, α-arm of the group relay Za, winding II, pa '", ö-arm of the group selector Gwa, winding I of the line relay Ua, selector (riva, winding II of the line relay Ua, connecting line va, Contact ^ b ¹ , contact tb ² , connecting line yb, contact ^ b ² , contact tb ^d , winding I of the line relay Ub, contact pb \ winding II of the line relay Ub, contact ^{pb 2} , 5-resistance W *, \ _Ώ . "", Resistance _ΐΡ {Relars} .75, earth.

In this circuit, the relay I ⁷ G responds, and so quickly that the contact na ^{1 is} opened, before the relay Ca, which, as can be seen from the drawing, works with a response delay, via its contact ca! - itself can short-circuit. Relay Ub also comes into effect and switches on relays Eb (removing the short circuit) and Cb through its contact via ¹ . Cb maintains itself via its contact cb ¹ , even if the head contact kb is open after the group selector Gwb is subsequently raised to a specific row of contacts (the relay Jb serving as a surge relay in a manner not shown). The relay Eb closes its own holding circuit through its contact eb ¹ and switches on the relay Sb via its contact eb ² : earth, eb ² , Sb, resistor JF ⁴ , -. Relay Sb prepares a circuit for relay Tb by closing contact sb ² .

After the group selector Gwb has found a free continuing connection line a ', V (e.g. to further group selectors or line selectors), the test relay Pb responds in a manner not shown and switches the connection on to the contacts pb ¹ , pb ~ by.

If the connecting line va \ vb disrupted,. B. by line break, or not ready to receive at the incoming end, because z. If, for example, the connection line is checked, with the connection relay set being removed, the circuit identified above via this line does not come about. As a result, the relay Ua does not respond, and the relay Ca closes itself in series 105, with the relay Pa via contact ca ¹ short. The relay Pa drops out and closes the circuit for the rotary magnet Da again via its contact pa ^s , even before the relay Va , which was de-energized when the contact pa ^{3 was opened} for the first time, has opened its contact va ^{2 with a delay.} The arms a, b, c of the group selector Gwa are thus moved on again and check the next connection lines. When a connection line is ready to receive at the incoming end, the processes described above are repeated.

A conversation count is z. B. caused in such a way that opposite potentials to the speech lines (e.g. minus

to α, earth to b) . As a result, the relay Zb located in a bridge comes into effect and by switching its contacts sb ¹ , sb ² closes a corresponding circuit for the relay Za, which in turn acts in a similar way on another counting relay. The line relays Ua, Ub, which work with a drop-out delay, keep their armature attracted despite the temporary interruption.

If the called subscriber hangs up after the call has ended, the line selector and the group selector Gwb (not shown) are triggered in a known manner. The same thing happens if the station to be called is busy. The contact mb assigned to the triggering magnet of the group selector (not shown) is temporarily opened. The relays Cb and Eb drop out. The relay Eb leads its contact eb ² back to the rest position and thereby closes a circuit for the relay Tb via: earth, eb ² , sb ² , Tb, -.

The-responsive relay Tb interrupts at the contacts tb ² tb ^3, the \ ^r Getting Connected line va, vb and closes via contact tb ^1, the relay Sb short, which in turn sb by opening of the contact ^2, the relay Tb brings it to waste. As a result of the above-mentioned interruption of the connection line, which is sufficiently long since the relays Sb and Tb drop out with a delay, the relays Ub and Ua are also de-energized, so that all parts of the transmission device Ueb are at rest again. The falling relay Ua short-circuits the relays Ca and Pa at the contact na ¹ : Earth, ca ¹ , na ¹ , Ca, c-arm of the group selector Gwa, winding I of the relay Pa, pa ¹ , earth.

The group selector Gwa is then triggered in a manner not shown. The connection has accordingly been released from exchange B through the transmitter Ueb backwards to exchange A , and the high-quality connection line is immediately released for new assignments.

Similarly, the connection line becomes free when the caller first hangs up. In this case, the group selector Gwa triggers first in a known manner (not shown), and this has, since Pa has fallen, a currentlessness of the connection line vajvb at the contacts pa ⁴ ; pa ⁵ and thus the loss of power, the line relays Ua and Ub result. The relay Ub then causes, after the relay Eb has been short-circuited via contact ü ¹ and has opened its contact eb ¹ , the release of the relay Cb, which initiates the triggering of the selector Gwb in a manner not shown. The relay Tb is also switched on via the likewise folded contact eb ² , which short-circuits the relay Sb via tb ¹ , whereupon all switching means in the transmission device Ueb are again in the idle state. In this case, the connection devices at the ends of the connection line were triggered forwards from exchange A to exchange B.

However, the invention is not limited to connecting lines with directed traffic, as assumed in the exemplary embodiment, applicable, but in a corresponding manner also on lines with mixed traffic.

Claims (6)

Patent claims: 1. Circuit arrangement for two-wire connection traffic in telephone systems with dialer operation, characterized in that switching means (Ua, Ub) are arranged in series with both wires of the connection line, assigned to this, which come into effect when the line ready to receive is occupied and remain energized until the connection is terminated. 2. x \ norder according to claim 1, characterized characterized in that the throttling effect of this switching means suppresses the speech currents as a result of differential switching will. 3. Arrangement according to claim 1, characterized in that both the forward as well as the backward-directed release initiated by this switching means -will. 4. Arrangement according to claim 1 and 3, characterized in that the switching means (Ua) at the outgoing end of the connecting line to the test circuit of the upstream switching mechanism (Gwa) transmits the criterion for the readiness to receive the connecting line. 5. Arrangement according to claim 4, characterized in that this switching means, if the connection line is not ready to receive, does not come into effect and the forwarding of the upstream Derailleur caused. 6. Arrangement according to claim 1, characterized in that the transmission of several counting current surges has no effect on the switching means (Ua, Ub) arranged in the connecting line. 1 sheet of drawings