DE1011001B - Circuit arrangement for telephone extension systems - Google Patents

Description

GERMAN

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DESO-GERMAN PATgfäTAMTES

The subject of patent application E 9711 VIII a / 21 a ³ is a circuit arrangement for telephone extension systems, with the help of which it is possible to receive an incoming exchange call as well as an exchange call from extensions provided for this purpose by means of the current impulse generator (ζ. Β. Dial or numeric generator) to switch. With the aid of preparatory relays in conjunction with the existing selection device, marking switching means are set, the switching state of which represents an indicator for the switchover of the first and second inquiry station that has been carried out. To switch the incoming exchange call, it is necessary to dial a preparation code and suffix the number of the extension that is to become the first answering station. By then dialing the number of the extension that is to become the second answering station, the exchange call is switched. If the normal operating condition is to be restored, it is necessary to select a preparation code, which must be followed by the selection of the number 1. From the embodiment of the main patent application it can be seen that for each extension to which the incoming exchange call or the exchange call is to be switched, two marker switching means (latching relay H and W) must be provided, as

The object of the invention is to reduce the number of marker switching means required. This is achieved in that the marking of the speech stations to be determined as interrogation and further call points is carried out by actuating the marking means in combination. As the actuating current, it is not only fed to an individual relay, but either to a relay group connected in parallel or to an individual relay. As can be seen from the circuit, only six latching relays are now necessary (Hl to HZ and Wl to WS), while twelve latching relays (Hl to H6 and Wi to W6) were necessary for the subject of the main patent application.

In addition, the establishment of the normal operating state is simplified in terms of operator control by inserting an intermediate relay. To switch back the incoming exchange call as well as the exchange call, all you need to do is dial the code. In the example given, this can be the number 7 as well as the numbers 8, 9 and 0 (without any changes to the circuit). The introduction of the incoming exchange call has also been simplified by saving the relays DA and Dn.

An exemplary embodiment for such an improved circuit arrangement is shown in the circuit diagram.

I. Choice of preparation code

If the first answering station (usually the main station) wants to switch the exchange call to extension 2 and the circuit arrangement
for telephone exchange systems

Addition to patent application E 9711 VIII a / 21a ³
(Interpretation document 1 005 571)

Applicant:

ELMEG, Elektro-Mechanik G. mb H. _F
Peine (Hann.)

Siegfried Wegner, Peine (Hann.),
has been named as the inventor

the exchange call that is normally received at extension 2 should be switched to extension 5, so the main office first dials the preparation code. This enables the following switching functions triggered:

a) Relay VIII, which prepares the setting of latching relay H, responds.

b) All series-connected shedding windings of the latching relays Hl to HZ and Wl to WZ are traversed by counter-fault current and drop off.

c) The relay chain is activated so that it is also used for the subsequent setting of the latching relay Hl .

This is done in detail as follows:

By removing the handset from the main unit, the internal connection set is assigned in the usual way, and the relays T1, J, Vl and AnI respond as a function of one another. With the subsequent selection of the preparation code (7, 8, 9 or 0) the relay / works in a pulsed manner and controls the relays of the relay chain I to VI with the aid of the relays K and L through the relay K in a known manner. During the election, the relay V 2 and the relay VS, not shown, hold. At the sixth impulse (relay K has dropped out, relay VI however picked up) the intermediate relay VII will respond, while the relay VI continues:

1. -

WiZ, pi, kl, P2III, 2III, 4111, VII (I),
VI (Π), 6ΙΙΙ,

, αη2, el, anil, vll, +.

709 550/137

1 Oil 001

3 4

Since with the seventh impulse, as is well known, the relay K laiskette remains attracted to the relay V , speaks after the

responds again, circuit 1 is disconnected and the release of relay V2 the latching relay group W2, W3 in

Relay VI drops out. Relay VII stops in the circuit below:

Circuit in which also the preparatory " W2ITV)

relay VIII is excited because its short-circuit by opening 5 8. -, 51,, 911, 8III, »21, +.

the contact was canceled: Ir 3 (I)

Wi3 4,1, AI, Uli, 3III, 5III, VIII (I) ^The addressed latching relay group W2, W3 is now-

2.—,, more the indicator for the switching state:

_{10 The} second answering station is extension 5.

'..''.''* Since the relay E is addressed due to the open contact 8II during the time in which the relays VII and VIII can no longer be effective in circuit 5 at the same time, the following output current does not occur - the relay chain is not activated again. The circuit for the latching relays Hl to H3 and Wl to WZ. Replacing the handset ends the switchover. _{n Wi / TT} . "_. _TTT . 15 Through the contacts 8V and 9III in the ringing circuit, ü;, S ⁽ Simi ^ xi 2tv 1 '^{{]> the} transmission of ringing current is prevented. The Um- Xt (IU-), Ui (IIi /, / ii, öiv, - (-. circuit interferes with the relevant extension part -If the digits 8 to 0 have been selected as the code number, subscribers in no way, then after a renewed drop in relay K in circuit 2 is disconnected. Relay VII drops out, while ao _IV . Incoming exchange call, relay VIII continues in the circuit:

RTQT 1T 1T-1- According to the switchover made, an arriving

4. -, ViIi (Il), oil, ai, anLi, vll, -j-, incoming exchange call initially at extension 2 and if after the series of pulses relay V2 is not queried here after a certain time

and then the relay V5 with a delay. During 25 extension 5 arrive.

Relay V2 has already dropped out, but relay V5 is still in. The incoming public call is pulled in the known manner, the drop-out delayed relay E speaks briefly- the relay A to respond. Relay. H is switched on in the circuit: tet and remains.

E- Ott e _T Ott 1 Via the contact AI and the contact All des Mar-

5. -, L ·, »11, vbL, viii, +. _{3o kierungsrelais H1} now addresses the relay U2 in

By briefly opening the contact, the circuit is: Dialing chain activated (was the number 7

has been selected, relay VII only drops out now) and ^y ~> ^{U2 hlI} > ^h21l > ^h3 > ^wlI1 > ^hI > +

restarted. You can thereby connect The call flow is in the cycle of the outside call to the secondary

with the preparation relay VIII to respond to the 35 digit 2 conducted in the circuit:

Marking relay H2 can also be used. _λττ ,, ",, .. · * _τ ,", _τ ~ "

⁵ 10. -, S (I), «211, Ζ2 (Ι), extension extension 2,

II. Post-election of number 2 Z2 (II), «2111, al, ~.

If, as assumed above, the incoming public call relay 5 does not respond to the ringing current, since it is switched to extension 2, then winding II by the contacts short-circuited main unit dials number 2. As is well known, after. Relay X also not, because it is switched differentially. Select number 2 in the relay chain Relay II is on. Relay S only speaks after the handset has been lifted, arises after the relay V2 has dropped out and, when the response circuit for the relay Hl shown below, relays G and V3, switches on the and the preparatory relay IX. 45 extension participant on the outside line. If OT ή λ n \ ty m «τττ 9 τ _l does not lift off against extension 2, then it heats up after an ö. -, Δ I, ^ 1 (I) IA (I),» ill, ν Δ L, + . For a certain time the thermal relay which switches on relay W When relays V2 and V5 drop out again. His contact z ^ III switches circuit 9 for relay E in circuit 5 effective, which results in the second free U2 and the following circuit for re-switching the relay chain and dropping relay II 50 lais U5 . Circuit 6 for latching relay Hl is disconnected, but this continues to be de-energized. The an- ^l1 · · ^ ⁵ ' ^w2l > ^w3 > ^wlll > ^h1 · + · spoken latching relay IfI is thus the indicator for the switching state via the contacts of the relay U 5, not shown: The first interrogation point is extension 2. The outside call is now analogue the one described above

When the preparation relay IX responds, 55 levels are routed to extension 5. Holding circuit 4 for the preparation relay VIII separated, which drops out. Preparation relay IX holds y_ switching back of the exchange call and continue in the circuit: exchange call

7. - IX (II), 91, anll, vll, +. _{6o The} z _ur u _c knahme the office call and Amtsweiter-

The newly started dialing chain in connection with the call to the main unit and extension 2 takes place from the preparation relay IX that is held and now allows the main unit to switch over the exchange call by selecting the preparation code. digit. The latching relays Hl, W2 and W3 drop in circuit 3 by counter-earth current, and via the relay Ul III. Second suffix ⁶ 5 becomes the next following exchange call to extension 1

directed:

Should, as assumed above, the external call from

^{Extension 2} can be switched to extension 5, so ^U - ~ ^U1 > ^MI > * ^ZII > ^h3 · wL11> ^M > +

necessary. Since, as is well known, there is no query after the end of the election, the external call (relay W

1 Oil

has responded) via relay U2 to extension 2:

13. -, t / 2, wll, w2ll, w3, will, hl, +.

Of course, it is possible to expand the number of extensions authorized to switch over by adding a Series connection of normally closed contacts of the relevant subscriber relay, the short circuit for relay VIII at Removing the participant apparatus is disconnected in each case. ίο

Claims (4)

PATENT CLAIMS: 1.Circuit arrangement for telephone extension systems with the optional determination of any intercom as an answering point for the handling of incoming official traffic and with call forwarding if an incoming office call is not handled after a certain time, in which marking means (e.g. stick-on relay) indicate the respective ao switching status according to patent application E. 9711 Villa, 21 a ^s , characterized in that the marking of the intercom stations to be determined as an interrogation and further call point by actuation of the marking means in combination (e.g. stick relays Hl and H2 for speech station 3 as the main station and stick relay W2 for speech station 4 as an additional call station) he follows. 2. Circuit arrangement according to claim 1, characterized in that by choosing a code number the Combination-wise actuation of the marking means is canceled by counter-fault flow. 3. Circuit arrangement according to claim 1 and 2, characterized in that the counter-fault current circuit comprises all or a group of the marking means (stick-on relays Hl, H2, H3 ... and Wl, W2, WZ ...) . 4. Circuit arrangement according to claim 1 to 3, characterized in that with only a number of η latching relays {Hl, H2, H3 ... Wl, W2, W3 ...) using a number of a maximum of k different class combination circuits [Hl, H2; Hl + Hl ... Wl, W2; Wl + Wl ... ) A sum at the maximum N = Extensions are switched, where N = (1 + 1) "= 2" or vice versa η = log2V / log2. 1 sheet of drawings <ü> TOfl'550 / 137 6.57