DE933574C - Circuit arrangement for manually operated telephone exchanges - Google Patents

Description

Circuit arrangement for manually operated telephone exchanges There are hand-operated telephone exchanges known in which the to this Exchange connected, subscribers through from this exchange controlled dialing devices can be connected to one another. These voting facilities usually consist of: two voters each, which are call-seeker or preselector-like set the lines to be connected. After hiring will be then, the selected lines are switched through.

With 'such systems there is usually the need that not only two participants can talk to each other but that making one Collective connection is possible. Because making one between two participants The call to be handled is mainly carried out by the switching center the call button assigned to each of these two interlocutors presses, whereby then the further switching processes for selection and switching are handled automatically must be ensured when establishing a hunt group; that pressing another selection key prepares the collective call status, if (you do not want to provide special switching devices that specify from the start, that a hunt group is to be established.

The invention thereby makes this special switching means common. that the actuation of a second Selection switching means switching means influences which digit is selected first in both the establishment of a connection via the dialing device and bring the establishment of a collective connection to a waiting state while each actuation of a further selection switch. the waiting state of the already selected position changes or produces so that only the production of a Collective connection with the first digit is possible. The invention thus Pear two-stage waiting circuit introduced; where in the first stage the waiting state located subscriber connection organs both the connection production via the. Dialing device as well as via the manifold are possible, while in the second stage of the waiting circuit activated by the actuation of the third selection switching means is caused, only the establishment of a collective connection is possible.

A 'significant saving in switching means results when man which prevent the simultaneous actuation of two selection switching means. Blocking means are used to transfer the criteria causing the waiting state into the subscriber connection devices admit. The switchover of the: wait state from: the one to the other stage by the fact that when the third selection is actuated, optional optional means the switching means preparing the connection via the dialing device is made ineffective, so that then only the collective connection via the Collective line enabling switching means remains effective.

Further features of the invention can be derived from the following exemplary embodiments which are shown at I-found in Figures: i to 4. In detail FIG. 1 shows the subscriber line of an ZB subscriber, FIG. 2 that one an OB subscriber, Fig. 3 the Albfrageeinrichtung of the exchange, the can also be available in duplicate and Fig. 4 .the selection device.

A centralized subscriber wants to use the telecommunications switchboard For example, if you talk to a locally powered subscriber, picking up the phone will do this of the, listener of the centrally fed subscriber "däs feed relay Sp (Fig. i) the subscriber loop for addressing is okay. The contact sp 3 of this relay switches both the call and busy terminals and the common call control (Fig. 3) a. The operator (Fig. 3) then presses the call button AT and brings the relay AS together with the BS relay to respond. This response. but can only come about when only a single button is pressed at the same time.

To ensure this, a device is built in that prevents several buttons from being pressed at the same time. This device consists of the relays TE, TF, TK, TV, TX and TY. When a query key AT is pressed, a relay TV is first made to respond in the following circuit: Minus, AS, BS, AT, te 4, TV, ty 3 ,, sm 4, tr 2, hu, 12, earth.

The relays AS and BS do not yet respond in this circuit because they only receive fault current. The contact tv 5 short-circuits the high resistance Wi so that the relay, TF can also respond by amplifying the current. The contacts tv2 and tf 5 switch on the relay TE, which -with dien contact te- ¢ puts a low-resistance winding in the circuit of the call relay AS. As a result, this relay can now respond together with .dem relay BS in order to enable further switching operations to establish the desired connection.

The contact te6 energizes the relay TK, which with its contact th 2 drops the relay T h. This also causes relay TF to drop out again via contact tv 5 , and a holding circuit for relay AS can now be established via contacts tv i and tf 2 'connected in parallel, with relay TK also holding in this circuit, that 'has already been switched on by te 6 .

If two buttons are pressed simultaneously or in quick succession, the relay TX responds in the holding circuit for the relay AS, since in this case the excitation of this relay coming through the winding I is that of the differentially switched winding II, which is via the Contact th 5 was also switched on, predominates. Contact tx 4 switches the relay. TY and the signal lamp TKL on, while the contact ty 3 interrupts the for .das relay AS; so that this drops out and no query status can come about. A further actuation of a button also remains ineffective, since by opening the contact ty 3 the current circuit decisive for the relay AS becoming effective cannot be established.

If the official wants to cancel this state, she has to press the disconnect button TrT, and thus bring the relay TR to respond. The contact tr 2 then interrupts the excitation for the relay TY and switches off the lamp TKL.

However, if the relay AS remains energized, ie if only one button was pressed, the contact as3 brings the relay AG to. Responding and maintaining the excitation for the relay BE at the same time. Contact bs 6 lights up the monitoring lamp OIL quietly, and contact a93 switches on relay BR. The relay BF is activated via the contacts br i, bf 3 (idle side) and sp 2, which with its contact bf 2 separates the call lamp from the busy lamp.

The operator queries in this way and then enters Enter the desired OB line (Fig. 3) by pressing the appropriate The answer button connects to the desired location. By pressing the common call button RT also brings them via the contact asq. the call relay R. The desired OB position for addressing, which is connected to its contacts r2 and: r6 applies the ringing current to the OB line: Up to this point, the query and waiting status at the ZB participant by calmly burning the AZ lamp and the query status during OB subscriber is indicated by the UL monitoring lamp burning.

If it is a ZB subscriber with whom the calling point is to be connected, this is confirmed with the occupancy by pressing. automatically called with the AT key. When the relevant key AT is pressed, the relays AS, BS, AG and BR respond one after the other, so that the relay R is energized with the contact br 5 !. This switches on the relay Rh with its contact ri, which activates the strongly damped relay RF. This relay maintains its contact rf q. and interrupts the excitation of the relay RV with the contact rf 3. While relay Rh is responding, contacts rv 6 and r q. a. Pre-call given to the ZB line, which is followed by the 5-second w # call after the relay RV has dropped out.

If the called subscriber hangs up, the responsive feed relay SP with the contact sp 2 causes the relay BF to respond, which with the contact bf 5 interrupts the transmission of the call. The contact bf 6 throws off the relay R and this with r i the relay BF.

The exchange has the option of making a permanent call during the 5-second call, as it can activate the relay RV by pressing the common call button RT, which can apply the permanent call current source to the subscriber line with its contact rv 6.

To establish the connection, the operator of the inquiry station now presses the common connection key VT and thereby causes the relay VS to respond both to the ZB and to the OB participant. The contact vs i switches on a relay E, which occupies a free voter connection set (FIG. Q.) Via a known starter chain circuit. In this occupied voter connection set, the starting relay AN is activated, which starts the rotary magnet of the selector DX with its contact at i. This forms an interrupter circuit with relay F and sets the selector to the subscriber line reached first. In the test circuit, the relay PX, which is switched on in preparation via the contact at 5, is activated and blocks the occupied connection with the contact px i. For the test process, this connection was marked in the subscriber connection organ with the contact vs 5. The contact px2 stops the selector DX and leaves the selector DY on, which now also starts up and adjusts itself to the other subscriber line to be connected. In the test circuit, the relay PY responds, which is triggered with the Ko @ ntalct pyq. this connection also blocks and brings a common test relay P to respond via contact py 5. This switches through the speech and auxiliary wires with its contacts pi, p 5 and p 6 and, by energizing the relay BR, allows for a further connection. the relay SV switches on the relays SF, which cause the relay BR to respond again at the ZB participant: and hold the still energized relay BR at the OB participant. The contacts brq. with ZB participants or br5 with OB participants switch off the relays H, while .the contacts sv i throw off the relays HS. The contacts sv 2 and sv 6 switch the subscriber lines from the Abfragepl.atz and to the voice lines of the voter connection set. The inquiry station can now switch on the connection for listening in by pressing the listening key MhT. For this purpose the inquiring station presses the key AT again and then the listening key iVIhT. The relay comes via the contact as i. M to respond, which with its contacts m 3 and rn 5 turns on the interrogator through capacitor coupling to the speech lines, with a ticker symbol is given on the line via the contact m 3 at the same time.

After the answering station has convinced itself of the establishment of the connection in this way, it can finally disconnect itself from the connection by pressing the LT button. The relay L energized by this key throws with its contact 12, the held relay AS, this with its contact as 3 from the relays BS and AG . The falling relay AG opens the holding circuit for the relay M with the contact a93, so that this also drops out. The contact m 2 returns to its starting position and thereby causes the lamp BL to light up quietly, which is interrupted during the listening state by a flickering lighting up of this lamp. The contacts m6 and d bs6 extinguish the monitoring lamp IUL, which also flickered on during the listening state via these contacts.

The operator of the remote switchboard has the opportunity to convince himself at any time which lines are connected to one another. For example, if she wants to make a subscriber station in a call free for an incoming, urgent call, she enters the line concerned at this station by pressing the AT key. She then presses the connection control button VKT, which causes the relay VK of the selected point to respond via the contact as 2. The contact vh a switches the Besetzttas, BL te in Flackerrhythmus a.

By pressing the TIKT button, however, the relay VK of the other place involved in the call is also switched on via the d switching arms of the voter connection set and thus the occupancy lamp BL assigned to this place is also switched on in the flickering rhythm by the grain clock vk 2 of that point. The operator recognizes which positions are connected to each other by the two occupancy lamps flickering in the same rhythm.

To end the connection check, the VKT key must be kept pressed during the check. had to be released and the delete key LT pressed. Contact 1.2 throws, as above. described, the relays AS, BS and AG of the relevant connecting member.

A specific conversation can be separated both by a unit involved in the conversation and by the operator. In the first case, the interlocutor in question hangs up his receiver and, if it is a ZB position, causes the relay, SP to be a nuisance. If the soldering bridge BR 3 and BR i is inserted, the contact spe energizes the isolating relay T, which de-energizes the relay BR with its correlation ti, if it is a ZB point. The contact t 5 separates the test circuit, so that the relays PX and PY drop out in the selector connection set and thus also de-energize the relay SV and its sequential relay SF . The busy lamp goes out, and since the PX and PY selectors work without a fixed idle position, the relevant position has already been separated.

If the operator needs to free a place involved in a connection for a priority call, it enters the line in question by pressing the AT button, switches on this line by pressing the MhT listening button with the ticker symbol and announces the disconnection. By pressing the isolating button TrT, the relay TR is made to respond, which energizes the isolating relay T of the relevant connection point with its contact tr i. The relay is now triggered as described above.

Except for discussions between two partners about the electoral ban rate. there is also the possibility of more than two participants in the form of a hunt group to be connected to each other via a collecting line.

To initiate a collective call, the exchange calls the first of the lines to be connected by pressing the AT button in the manner described above. If you now press the AT button on the second line without first pressing the delete button LT , the relays TV, TF, TE and TK are energized in the circuit preventing the double check. The contacts tv i and tf 2 separate the holding earth from the holding winding of the relay AS , which drops out and with its contact as6 via the still operated contact bsq. the relay HS responds (. The contact hs 6 switches on the relay H , while the contact hsq. or hs2 prepares the connection with the aid of the relay VS and thus puts the line called first into a waiting state Inquiry button the waiting circuit does not coincide, this is transferred to a second stage by actuating the contact h2, in which it can only be canceled by hanging up the ZB point, by entering the switch or by the final establishment of the collective connection.

If all parties to be involved in the collective call are called, the relays H are energized in all connection organs, with the exception of that of the line called last, and the relays SG are thus prepared via the contacts h 3. In the connecting organ. of the line called last, the relays AS, BS and AG are still energized, so that 'here the relay: SG is prepared via the contact ag i.

The exchange now actuates the collective call key SaT, and the relays SG respond in all connection organs of the bodies to be involved in the collective call. The contacts sg2 and sg 6 switch the speech circuits of these lines preparatory to the collective line, while the contact sg i the relay! SG holds pressed independently of the SAT key and switches on relay SV and its secondary relay SF.

The group call status is confirmed by the constant switching on of the call lamps. the group interlocutor is displayed with the help of the contact sg 5, whereby these lamps flicker every second. The busy lamps are continuously switched on via contact sf 5 : In addition, a special lamp SZ, which indicates this connection status, lights up.

The switching is switched off by the last called line through the contacts sv 2 and sv 6 , but it still remains involved in the collective connection, since when the key f #T d # s: relay SM was pressed, there was a response that ' t keeps his KOntaktsm4. The contacts, the headset of the attendant console directly to the collective line.

Anyone involved in a hunt group can; from Switch off the collective call, namely. the ZB subscriber by hanging up the handset and the OBG participant by request. Switching occurs by pressing the disconnect button the end.

If a ZB subscriber hangs up his receiver during a collective call, his feed relay SP drops out, and the relay T is made to respond via the contact spe. The contact t6 switches off the relays SG, SV and .that also Sf and .brings the relevant connecting element into the rest state in the manner described above.

Is the solder bridge Br 3 and Br4 for an OB participant. soldered in, then by calling up the contract arq. the relay: T made to respond and thus the disconnection of the relevant connecting organ. carried out.

Will .. the placement of a. If you activate a collective call, the subscriber involved in a collective call is ready for a priority call, so she enters the line in question by pressing the AT key and switches to the existing call with the MhT key. After the announcement of the disconnection! She actuates the disconnection key TrT and thus brings the relay T via the contact ty i to respond, which disconnects the relevant subscriber line.

Claims (9)

PATENT CLAIMS: i. Circuit arrangement for manually operated telephone exchanges, where two subscribers via dialing devices set by the exchange connected to each other and more than two participants to conduct a collective call can be connected to a common line for all participants, whereby the selection among the subscribers to be connected or connected by i selection switching means to be operated by the exchange takes place,, thereby characterized in that the actuation taking place in the course of a connection establishment a second selection switching means (AT) switching means (HS, H) influences which the first selected location in a both connecting over enable the dialing device as well as the establishment of a collective connection Bring the wait state, while each actuation of another selection switch @ (AT) - changes or establishes the waiting state of the already selected position, that only the establishment of a collective connection with the first digit is possible is. 2. Circuit arrangement according to claim i, characterized in that the simultaneous actuation of the selection switching means (AT) preventing the blocking means (TE, TF, TV, TK) when two selection switching means are actuated one after the other, the switching means (H , RS) to respond. 3. Circuit arrangement according to claim i and 2, characterized characterized in that the establishment of a collective connection by its excitation preparatory relay (H) independently of the excitation this establishes a connection sets via the selector enabling relay (HS) in a holding circuit. q .. Circuit arrangement according to Claims i to 3, characterized in that the Establishing a connection via switching means (HS) that prepares the voter device is made ineffective each time a further selection switch is actuated. 5. Circuit arrangement according to claims i to q., Characterized in that the switching means (AS, BS, AG) occupying the subscriber concerned prepare the switching means (SG) switching the collective connection through in the last selected subscriber connection org.an a collective connection. 6. Circuit arrangement according to claim i, characterized in that the preparatory switched on switching means (SG) of the individual in a collective call to (participating bodies by a common switching element (SAT) to be operated by the exchange can be made effective. 7. Circuit arrangement according to claim i to 5, characterized in that the through its excitation .die selected call stations in a waiting state only enabling the production of a collective connection placing relay, (H) by -the collective connection, through-switching switching means (SF) is made ineffective. B. Circuit arrangement according to Claim i, characterized gekenmzeichtnet that -the existence of a collective call 'of the exchange is shown. 9. Circuit arrangement according to claim i, characterized in that with the -the selected and preparatory speech stations to the bus connecting switching means (SG, SV, SF) switching means of the exchange (SH) become effective, .die their headset with the shutdown of, the last Connect the called line directly to the collecting line. ok Circuit arrangement according to Claim i, characterized in that after the establishment of a collective call, the individual conversation partners can be selected again by the exchange for the purpose of switching on and @ or disconnection.