DE1252755B - Joint transmission for two-way connections in telecommunications, in particular telephone systems - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

IntCL:

H 04 m

German class: 21 a3- 51/01

Number: 1252755

File number: S 89009 VIII a / 21 a3

Filing date: January 10, 1964

Opening day: October 26, 1967

The present invention relates to a joint broadcast for two-way connections with a separate identification relay for each of the connected Subscriber stations and a common starting relay in telecommunication systems, in particular remote intercom systems, in which rectifiers inserted in the individual branch lines for the two ■ Subscriber stations of opposite polarity guarantee their secret traffic.

One wants the use of earth at the subscriber stations and the disadvantages associated with it can be avoided with such two-way connections to identify the individual subscribers The principle of alternating current identification is used. One known arrangement has an over the common connection line and the subscriber loop running from an AC voltage source powered starting circuit containing the windings of two identification relays, the such by one rectifier and one normally open contact of the other identification relay are bridged that when the loop closes at one of the subscriber stations through the effectiveness of the in The rectifier inserted into the subscriber branch line is only one of the two identification relays can be excited. A disadvantage of this arrangement is that it has to bypass the relay windings Rectifiers lying between the speech wires in the idle state are often caused by overvoltage be destroyed.

To avoid this disadvantage, another known circuit arrangement uses a common starting relay for both subscriber stations. This prepares the response circuit for the actual identification relay via an auxiliary relay. This response circuit is fed by the DC operating voltage and runs, among other things, via the rectifier inserted in the subscriber branch line, and is therefore only effective at the subscriber station at which this rectifier is forward polarized. The criterion of whether or not the named identification relay responds to the identification is therefore used. In the first case, it makes the crossing of the speech wires necessary to supply the calling subscriber station and switches over the charge meters. A serious disadvantage of this arrangement is that the identification relay responds in any case if the rectifier inserted in the subscriber branch line in question has become conductive with low resistance for both current directions as a result of damage. From the subscriber station that is actually through the non-community transfer for two-way connections
in telecommunications, in particular telephone systems

Applicant:

Siemens Aktiengesellschaft, Berlin and Munich, Munich 2, Witteisbacherplatz 2

Named as inventor:

Herbert Philipp, Munich -

response of the identification relay should be characterized, despite the crossing of the two speech wires a call is being made but the wrong billing meter is being charged.

The invention eliminates the disadvantages mentioned in that the starting relay is one of a DC voltage source powered response circuit for the The first of the two identification relays mentioned is prepared, which is therefore only effective if the rectifier inserted in the subscriber loop the polarity of one of the two subscriber stations has the same polarity, and that the second of the named two identification relays in a response circuit also prepared by the aforementioned starting current responds with a delay, in a holding circuit running through the subscriber loop but can only hold if the rectifier inserted into the subscriber loop is that of the other Subscriber station has the appropriate polarity.

In this way it is also possible to check the status of the station assigned to the calling subscriber station Rectifier, namely to check its conductivity for both current directions.

According to a further embodiment of the invention, the response of both Kerinzeichnung relays to delayed initiation of an alarm is used. This alarm signal is to be delayed because yes, too during normal connection establishment by that subscriber station whose associated identification relay, if necessary, directly via the subscriber loop responds, in any case also the identification relay the other subscriber station to test the inserted in the subscriber drop line Rectifier is briefly excited.

An exemplary embodiment of the invention is shown in the drawing. In addition to the starting relay R 1 and the two identification relays 51 and 52, this circuit also has an auxiliary relay H and

709 679/82

the two isolating or through switch relays Tl and Γ 2. The shared transmission shown has access to two advanced facilities, such. B. two preselectors or two subscriber circuits. A known subscriber circuit TS1 is indicated to explain the switching processes. The invention can of course also be implemented in such a common shaft transmission that initially does not address access to only one subscriber circuit, a preselector, since it is via its winding II in the circuit

_{(8) Earth 4h 4sl Ss2 T1 (n) cl}

receives a counter-excitation.

The relay R 2 in the subscriber circuit TS1 can connect via the closed contact chain 5h, 5si, 6s2 between the two speech wires a1 and oil.

speak g. With its contact 2r2 it causes in

or a call finder. Since, in the manner known, the start of a free call made exemplary embodiment, the charge counters the seeker. If this call seeker is assigned to the individual subscriber circuits, circuit with a free first group selector can, for example, connect this joint transmission, the negative potential disappears at the in the main distribution room, so that wire el, so that the counter-excitation of the relay Tl in the actual voting room no wiring - 15 circuit (8) is omitted and the relay T1 responds , changes are required. can. Simultaneously speaks in the subscriber circuit

W TSl on the isolating relay Γ 2 and switches the speech

wheels free. The relay Γ1 in the community transmission blocks with its contact 5/1 that of the other subscriber station assigned subscriber circuit TS 2. The contacts III and 2/1 interrupt (J _6n hold circuit (6) of the labeling relay Sl ^and switch the speech wires to the calling subscriber station through.

Similar shifts are taking place when the community transmission connected to Vorwählern j _s ^ j _n this case disappears the negative po-

The contact Ah closes its circuit for the ^{tial on} the wire el as soon as the voter leaves its zero identification relay 52. Its suit is, however, position.

heavily delayed, because parallel to its winding I over 3 ° When the call at the subscriber station Tn 2, the rectifier G and the capacitor C are grounded
winding II acting in the opposite direction is switched on.
When the loop closes at the subscriber station
TnI occurred, so can in the circuit

(3) Earth, 01, 1 h, Is2, 1/2, 2il, b, Gl, TnI, a, 1/1, 2/2, 2 s 2, 2 h

the identification relay 51 respond, since the rectifier claims Gl in the forward direction id D Kihi h

g d wrd.

If the handset is picked up at one of the subscriber stations, it speaks in the circuit

m WO fli (TD 2? 1 2h 2i2 2/2 1/1 α

lnl / 2 Cr 1/2, b, ItI, IiZ, 152, lh, lsi, Rl (I), WQ

the starting relay Rl on. His contact IrI lets the auxiliary relay H respond. This separates the circuit (1) and holds itself in the circuit ^a 5

(2) Earth, H, Wi, oh, 3s2,.

3 ⁵ S, the relay Sl so can the m electric circuit (3), are ^{in the} mutatis mutandis TnI and Gl through Tn2 and ^replace G2, do not respond because the ^{rectifier G2} is ^{reverse-biased.}

On the other hand, the relay 52 can hold itself in a circuit corresponding to the circuit (5) after it has picked up via the contact 4 h. The subscriber circuit TS 2 is seized via the contact chain 6Ä, 6sl7s2

Rectifier Gl in the forward direction claims g g g

will. The identification relay 52 is responsive to waste ⁴ ° ememireien first group selector is responsive in the course of its starting time delay also. His circuit
Contact 3s2 interrupts the holding current (2) for the
Auxiliary relay H. The circuit (3) is also

separated. The identification relay 51 can be in ^ J i ^

d i 45 put through and under to subscriber circuit Γ5 2

breaks the holding circuit for the relay 52. The contact 5/2 blocks the subscriber circuit T51 against incoming occupancy.
^{Is d} ? ^r »? ^the subscriber branch line of the call lh d Gh

Circuit

(9) Earth, 4h, 4si, T2 (I), -

^Relm J * ^a "^'sch i ^{tet the} ™ ^ ^{e" de} Tednehmer-

the circuit

(4) earth, 51, 3slm, 3s2,

but keep going. The identification relay 52, whose response circuit is caused by the drop in the re-

whose response circuit is caused by the drop in the Re- /?,? G

ImH has been opened, now checks whether. There is in the ⁵ ° the participant point to enable the secret

Si traffic inserted rectifier defective ie for

G
Circuit

(5) Earth, 2s 2, 2/2, 1/1, a, TnI, Gl, b, 2ti, Ii 2, Is 2, 52 (II), -

gg

Traffic inserted rectifier defective, d. H. for Conducting both directions of current, it always speaks in a circuit corresponding to circuit (3) the identification relay 51 on. On the other hand, can

S.

in the circuit

(6) Earth, 51, lsi, lh, Ii2, 1 * 2, '2/1, b, Gl, TnI, a, 1/1, 2/2, 2s2, 2h, 2sl, -

can nalten.

The relay Tl can be in the circuit

(7) Earth, 4h, 4si 5s2, 4/2, Tl (I), -

In the circuit

^{4h>4sl> Ss2} > ^AL > ^An >

the alarm device AL becomes effective with a delay, because this circuit is _{briefly closed even during normal connection setup by the subscriber std] e Tnl} , since the two identification relays S1 and 52 to check the in

the subscriber branch line of the inserted rectifier are tightened. The alarm can be given, for example, in such a way that the relay on the rotary magnet of a selector equipped with the selector arms wl and w 2 energizes, that this selector determines the joint transmission in question with his arm w2, is stopped and in this joint transmission one Warning lamp L turns on.

Claims (3)

Claims: IO 1. Community transmission for two-way connections with its own identification relay for each of the connected subscriber stations and a common starting relay in telecommunications, in particular telephone systems, in which rectifiers inserted in the individual branch lines of opposite polarity for the two subscriber stations ensure their secret traffic, characterized in that the starting relay (R 1) prepared a response circuit, fed by a DC voltage source and running through the subscriber loop, for the first of the mentioned two identification relays (Sl) , which therefore only becomes effective if the rectifier inserted in the subscriber loop has the polarity corresponding to one of the two subscriber stations , and that the second of the said two identification relays (S 2) responds with a delay in a response circuit also prepared by the said starting relay (Rl), in a via the subscriber loop v running holding circuit can only hold if the rectifier inserted in the subscriber loop has the polarity corresponding to the other subscriber station. 2. community broadcast according to claim 1, characterized in that the structure of a outgoing connection is prevented if both identification relays are active. 3. Community transmission according to claim 1 and 2, characterized in that an alarm device is switched on when both identification relays are active. Considered publications:
German publication No. 1124099. 1 sheet of drawings 709 679/82 10.67 © Bundesdruckerei Berlin