DE675938C - Circuit arrangement for telephone systems - Google Patents

Description

Circuit arrangement for telephone systems The invention relates on a circuit arrangement for telephone systems, in which for connection authorized and unauthorized microphone units are provided and a connection by. that created by the calling station during the test period of a voter Switching potential initiated and by locking means before or after the test time after connection of the potential the connection is prevented according to the patent 66, .1. 112.

In systems of this type where the activation authorization is through a temporary incentive that takes effect during a voter's review period and at the same time the activation is effected, the delivery of the Activation incentives that take effect automatically at the specific point in time Means dependent, so that the connection point authorized to switch on immediately Setting the voter to a busy connection point with the latter Body is connected. This immediate connection of the calling connection point with the occupied connection point is undesirable in many cases, while the immediate connection with a free connection point must be made in any case.

The invention aims now, even with systems according to the main patent Establishing a connection path the final establishment of the connection of the calling party Junction with the occupied junction from. Will of the calling connection point to make dependent and achieves this by the fact that after during the test period one Elector's intrusion incentive that has become effective is an incentive to the dem. Connecting route the means assigned to the authorized agency is transferred, through which the ability to speak at this point is prevented and only through a special switching measure the place can be ordered to speak.

This development of the subject of the invention of the main patent achieves the advantage that even in systems in which the connection takes place through temporary incentives that automatically come into play when the connection is established, the call circuit of the calling station to an occupied high-quality connection bell, e.g. . B. Direct, only takes place if an urgent and high-quality connection is actually to be made to the preferred connection point, while the immediate connection of the calling connection point with a free connection point is guaranteed in any case. The drawing shows an execution -y example of the invention shown. This is a private branch exchange in which internal connections are established via the call finder AS, the group dialer @GW and the line dialer LW . Outgoing exchange connections are established via the call searcher AS, group selector GW and the exchange line AL. Aniz-, incoming trunk connections are indicated to an I \ T-Ebenstellebeamtin by the incoming call current over the trunk, the officer switches the apparatus BA to the calling trunk AL , accepts the request of the calling subscriber (and then initiates the setting of the caller AS on the calling trunk AL and also the setting of the group selector GW and the line selector LW on the desired subscriber.

If the officer leaves z. B. their place during the night, the night station NSt is identified as a night station by turning the night switch NS. When an outside call comes in via the outside line, this station is connected to the calling outside line and can then in turn forward the outside connection to any extension subscriber @ ehmer. If a connection is now forwarded to an occupied subscriber by the civil servant or the night station NSt, then immediately after the delivery of the series of current impulses, in the time in which the temporary test potential is applied to the switching arm. c of the line selector LW is applied, the connection of ground potential via the speech wires of the connection path, which, when the line selector LW is set, has the effect that a connection to the occupied subscriber in the line selector LW is brought about.

Establishing an internal connection. If, for example, the subscriber Tui establishes a connection with the subscriber Ttt °, then after lifting the handset at the speech point Ttti, the caller AS is set in a known manner to the calling subscriber Trti. By eliminating a certain number of currents, the CGW group selector is set to the specific hundreds of the desired participant. After this setting, relay A in line selector LW is excited via the following path. -, winding 1 of relay A, contacts itiz :: zm, winding I of relay Q, contacts .., qb, switching arm a of group selector GW, altarm, «of the caller AS, via the subscriber loop of the subscriber Ttzl, switching arm b of the caller AS, switching arm b of the group selector GW, contacts 5b, 6p1, winding II of relay Q, winding II of relay A, +. In the aforementioned circuit speaks Relay A on; Relay Q is a differential relay which is not excited in the aforementioned circuit. Relay A closes contact 7a. Relay C responds. A series of current pulses is now transmitted to set the line selector LW the series of contacts to which the desired subscriber is connected The interruptions generated by the number switch of the calling station are transmitted to relay A. Relay A drops out according to the interruptions and influences the following St rom circuit: -f-, contacts 811, 9p, winding I of relay V, contacts ioc, i iu, rough, shaft contact 1311 #, lifting magnet H, -. The relay V remains energized during the series of shock pulses. If relay V drops out after the end of the series of impulses, the following circuit for relay U is closed: -f-, contacts 8fz, 9p, 1q.c, head contact i 5k, contact 16c, winding I of relay U, shaft contact i3tv, lifting magnet H. , -. In the aforementioned circuit, only the relay U is energized, while the solenoid H remains unaffected. Relay U causes the switching from lifting magnet H to rotary magnet D by opening contact 1 azt and closing contact 17u. The last series of impulses sent by subscriber T1 is transmitted to rotary magnet D. The circuit runs through: -E-, contacts 8t2, 9p, winding I of the relay V, contacts ioc, 1 ia, i 7a, rotary magnet D, -. Relay V is also excited during the current surge period and opens contact 141.7 during this time, so that the circuit for relay U via: winding I is interrupted. The relay U is kept energized during the actuation of the rotary magnet D by the transmitted current series via the following path: +, contacts i8c, igv, aoa, winding II of relay U, contact z ip, -. If the relay V drops after the end of the series of impulses, so. the contact 19v is opened and thus the holding circuit via the winding II of the relay U is interrupted. However, relay U only drops out some time after relay V. Relay V, which has already dropped out but is still energized, temporarily applies test potential to switch arm c of line selector LW via the following path: -L, contacts 22c, 23i ', 2411, windings 1I and 1 of relay P, relay P1, switch arm c of the line selector L 1'v 'in the position of the subscriber to be called, subscriber relay T2 of the desired subscriber Tit °, -. If the participant Tiz = free, the relay P can respond. The relay P closes the Kontäkt25p and blocks the .angerufenen subscriber in a known manner by short-circuiting the high-olunigen winding II of the relay P. Relay P closes contacts 26p and 27p and prepares the ringing circuit. After relay U has dropped out, the following circuit is established for winding II of relay V: -i--, relay breaker RU, contacts 2811, 291 ', 3oh, winding 1I of relay V, -. The relay V is energized at certain time intervals by the relay interrupter RU and creates the following ringing circuit by opening the contact 3 iv and closing the contact 32v: From the ringing current source R, contacts 32v, 33 >>, winding I of the relay Y, contacts 26p , 3.1 >> i, Schaltarma of the line selector LW, via the alarm clock at the subscriber station Tiz2, switch arm b of the line selector LW, contacts 35p1, 27p, winding II - of relay Y, winding II of relay N, earth. If the called subscriber answers, so. relay Y is energized in the pause and opens the circuit for relay V on contact 2gy. The following supply circuit now exists for the called subscriber: -, winding I of relay N, Ivantakte 31V, 33 >>, winding I of the relay Y, contacts 26P, 3401, switching arm .a of the line selector LW, loop of subscriber TiZ2, switching arm b of the line selector LW, contacts 35P1, 27n, winding II of relay Y. winding II of relay N, -'-. The relay N is not energized in the aforementioned circuit because it is connected differentially. The connection between the participants Trtl and Tate is thus established.

If subscriber Trz2 is busy, relay P cannot respond during the test period in which relay V has dropped out, but relay U is still energized. After relay U has dropped out, relay B is switched via: -f-, contacts 93p1, 9.11a, relay B, contact ggzn, shaft contact 58u '; Contact 21P, - excited. Relay B opens the circuit via relay A at contacts 4b and 5b. As a result, the feed bridge relay A drops out and opens the circuit of relay C with contact 7a . Relay C drops out. A circuit is established for the rotary magnet D via: +, contact 811, 9P, 14v, I 5h, 36c, 37u, rotary magnet D, -. The rotary magnet D operates the contact 38d, so that relay U is excited via: -, contacts 811, 9p, 14v, head contact I51. #, Contact 38d, winding II of relay U, contact 2I7, -. Relay U interrupts the circuit for the rotary magnet D at contact 3711. The rotation m, agn-, t D, is de-energized, opens the circuit for relay U at contact 38d. Relay U drops out and closes contact 3711 again. The last one called circuit for the rotary spindles D comes about again. The rotary magnet and the relay U work together as a self-interrupter until the Lüitun-sw selector LW has reached the rest position in which the head contact I512 is opened. As a result, no circuit for the rotary magnet D or relay U can be established. The subscriber receives a busy signal in some way and hangs up the receiver. The facilities taken into use go back to the rest position.

The release of the line selector LW after the call has ended after hanging up the receiver at the calling station and thus the relay A drops out caused in the manner previously described.

Establishing an outgoing exchange connection If the subscriber Tizl wants a connection with the exchange line, the caller AS is set to the calling subscriber in a bel @ annter way by lifting the receiver. By sending out a certain series of impulses, the group selector GW is set to a series of contacts through which the exchange lines can be reached. The group selector @GW searches freely for one of the free trunk lines, e.g. B. AL, from. After the trunk line AL has been occupied , the following supply circuit is ordered for subscriber Tal: -, winding I of relay S, winding f of relay X2, line 39.Switch arm a of group selector GW, switch arm a of caller AS, subscriber loop of subscriber Tnl, switch arm b des Call seeker AS, switching arm b of the group selector s, GW, line 4o, winding II of relay X2, winding II of relay S, -i-. Only relay S responds in this circuit. The relay X2 is a differential relay. The series of current impulses sent by the subscriber Tat 'are picked up by the relay S and transmitted to the winding III of the relay J through contact 41S. The relay J transmits the power pulses through contact 42i to the trunk line AL. During the series of impulses, relay V1 is energized via contact 43i and relay 112 via Ivointakt 44t1. Establishing an incoming exchange connection If an exchange call comes in via the exchange line AL , the relay AR is energized. Relay AR switches on a call signal for the officer in a manner not shown. The officer then presses the inquiry switch AT of the calling exchange line. The relay AB is excited via: +, hook switch HU , normally open contact of the button AT, relay AB, - . Relay AB persists after releasing the exchange key AT. +, Hook switch HU, break contact of the button AT, contact i z4ab, relay AB, -. The apparatus of the official BA is turned on by opening the contacts i and o6ab 1 07ab and closing the contacts 45Ab and 46ab to the trunk line AL. The officer accepts the request of the calling public office participant and then presses the connection key VT. The relay VR is energized via: +, hook switch HU, button VT, relay VR, -. The relay VR remains independent of the button VT via contact i z3vr. Relay Dl is energized via contact ii 61yr. By opening the contacts ii91 "@ - and 1 zovr and closing the contacts 471 ', Y and 48vr, the Beamtili BA apparatus is connected to the line 5i, leading to the caller AS via the contacts ioiab and iozab that are already open and the closed contacts 49ab and Soab. By closing the contacts 49ab and 5oab a loop was formed over: line 5 i, contacts 8011, 49ab, winding Ir of the relay Dl, contacts 1I8izsi, 5oab, bitt, line 5z and thereby the setting of the caller AS on the line 51, 5 2 in a known manner, not shown. The officer now sends by means of the contact ii 8nsi operated by a current impulse transmitter out current impulses via the line 51, 52 through which the group selector GW and the line selector LW are set In the series of current busbars, contact 5311s is closed in any known manner and thus also energized relay E. Relay E closes the current circuit via contact 54e ice for the relay El. When the relays F_ and El are excited, the connection to earth via the contacts 55e and 56e1 is interrupted. When the series of current impulses has ended, relay E first drops out and applies earth to line 51 when relay El is still temporarily energized. This ground connection does not trigger any switching processes when the group selector is set ('2W.

After a line selector LW has been assigned via the group selector GW, the following circuit is established: -, winding I of relay A, contacts In, 2171, winding 1 of relay Q, contacts 3p1, 4b, switching arm, a of group selector GLV, switching arm of call seeker AS, line 51, contacts 8otl, 49ab, winding II of relay Dl, contacts ii Sjtsi, 5oab, 8111, line 52, switching arm b of caller AS, switching arm b of group selector GW, contacts 5b, 6p1, winding 1I of relay Q, winding II des Relay A, -f-. Relay A is energized. The relay Q is switched differentially. For relay Dl this circuit is a holding circuit. The line selector LW is set to the specific contact group by the following series of rushes. The setting of the line selector LW takes place in the same way with relay A, as already described for the establishment of an internal connection. After the end of the series of current impulses on the part of the officer, the earth connection is temporarily canceled by relays E and El. As a result, the differential relay Q in the line selector LW is excited, but cannot, since the selector has not yet turned in, trigger any switching operations. The relay Q drops out again after the temporary earth connection.

After setting to the specific contact row, the officer sends out the last series of current impulses, through which the line selector LW is set to a specific contact of the selected contact group. The switching processes that are caused by the last series of impulses are the same as described when an internal connection is established. After the end of the series of impulses, the contacts 55e and 56e1 are used to temporarily connect to earth again during the time in which the relay V in the line selector LW has already dropped out and the relay U is still energized. The differential relay Q is excited by the Ir dans-circuit.

If the subscriber to whom the line selector LW is set is free, the relay P responds during the temporary test period in which the relay V has dropped out but relay U is still energized and causes the switching processes already described when establishing an internal connection , such as blocking, switching through, calling, etc. The relay Q drops out after the temporary earth connection.

If, on the other hand, the subscriber to whom the line selector LW is set is not free, the relay P cannot respond and the following holding circuit is established for the relay Q: - (-, winding III of relay Q, contact 57q, shaft contact 58iv , Contact tip, -: Furthermore, after the end of the temporary test time and thus the relay U drops out, relay B is excited via: -, contacts 93p1, 9,411, relay B, contacts 95n1, 581v, 2ip, -. Relay Q causes dile contacts - 59q, bog, 99g and toog closed.

Furthermore, by energizing the relay B, the contacts 4b and 5b are opened and the contacts 96b and 97b are closed. By switching to the speech wires of the winding 1 1, so that the relay D 'is brought to the waste relay Dl now durchllossen in the opposite direction from the current. Relay Dl, opens the contacts ii odl and ii id ', so that the connection between the officer and the Teiltielimer Tu = is interrupted, since the contacts 121vy and i22vr are also open. By closing the contact ii 2d 'the "busy lamp" is energized via +, contacts ii2d', i i3ab, lamp BL, -. The officer recognizes by the lighting up of the lamp BL that the subscriber desired by the office Tito is busy.

If it is an urgent connection for the calling public office subscriber, the officer can now initiate activation of the busy subscriber Tiz '= by pressing the QT key. Relay Q 'is energized via -f-, hook switch HU, button QT, relay Q', -. The relay Q 'closes the contacts 114 (/' and 115g '. The connection between the officer and the busy subscriber Tiz = is thus established, and the officer can now alert the calling subscriber to the existence of a particularly preferred connection Called busy subscriber T112 will then terminate and release his existing connection. After this, the relay P in the line selector LW can now respond via the distribution switch VS, which prevents double checking, and the transferred Kontalz: t 61g and the already described sustaining processes, such as switching through , Call etc. Relay P interrupts the holding circuit for relay Q and the circuit for relay B at contact 2 i p The switching of the speech wires is canceled and the relay D 'responds again.

By hanging up the receiver on the part of the officer, the hook switch HU is opened, the relay AB drops out, the exchange line is switched through to the contacts io iab, i o2ab and i o6ab and i o7 . The holding circuit for relay VR is also interrupted. Relay VR returns its contacts to the rest position, and the circuit for relay Q1 at the hook switch contact Hu is also interrupted. After the exchange line has been switched through to the contacts ioiab and io2ab, the current circuit of winding II of relay Dl is interrupted. By opening the contact ii 6vr, the winding I of the relay D 'is also de-energized. The relay D ' returns its contacts to the rest position. The connection to the desired subscriber Tit- 'is now established in the same way as if the teünelim @ er was free on: the call.

Inquiry connections If there is an exchange connection between a calling subscriber Tiz 'and the exchange line AL , the calling subscriber Tnl can initiate an inquiry connection by pressing his key Tal. Through the. Pressing a button, the differential relay X2 in the supply circuit is excited, which acts with contact io5x = on a schematically shown switching device Z, in such a way that a switchover from the exchange line AL to the line 62, 63 by opening the contacts dq. z and 652 and closing of contacts 662 and 67z is brought about. By closing the contact 692 , the rush contact q.2i is shortened so that subsequent rushes sent by the inquiring party are not transmitted to the exchange line AL, but via the closed contact 68z, throttle Dr2 and rush contact 69i to the line 70, 7i to which a call seeker AS has adjusted when switching through the device Z. The group selector GW and the line selector LW are set by the series of current impulses in the manner already described for internal connections. During the series of impulses, relays V 'and V2 are energized. A connection via the contacts 72v2 and 73v1 does not take place, since the relay P2 is not energized and thus the contact 747) s is also open when the subscriber makes inquiries.

If the inquiring party wishes to connect to the exchange line AL after the inquiry call has ended, the switching device Z is acted on by pressing the button again via relay X2, which switches over. from lines 62, 63 to the trunk line AL by opening contacts 66z and 67z and closing contacts 64.z and 65z.

However, if the subscriber called in the inquiry, e.g. B. the participant Tit2, take over the Aants conversation, he presses his key. Taz, as a result of which the differential relay N in the feed circuit of this participant is excited. RelayN applies earth to one voice wire via contacts 75z2, 6p1, while opening the contact in and closing contact 76z2 creates a holding circuit for relay A, disconnecting the voice wire. By connecting to earth via contacts 7 5h and 6p1, the differential relay X1, whose circuit is via: -, throttle Dr, winding I of relay Xl, contacts 77v °, 69i, throttleDrz, contacts 78v °, 792, winding II of relay X1, throttle Dr, - (- runs, energized. The relay X1 acts with contact i o3x 'on the switching devices U, U1 shown schematically. This influences the switching device Z in such a way that the switching from the lines 62, 63 to the exchange line AL is initiated is and further, the outside line AL ott by opening the contacts 8, 8 iu and closing the contacts 82u is 83u connected to the line 70, 71 is thus the inquiry of;. participants tzzz with the trunk line AL connected by the Umschaltekriterium part of. inquired subscriber, the connection path via the call searcher AS and group selector GW for the inquiring subscriber Tzt 'is separated in a manner not shown If the accepting subscriber in turn establishes an inquiry connection, the earth criterion is transmitted to the differential relay X by pressing a button, which acts with contact io4x on the switching device Z, through which the connection from the exchange line AL to the lines 62, 63 takes place. Since the contacts 84u1 and 850 are open and the contacts 86u1 and 87u1 are closed, the inquiry connection is established via the lines 5 i, 52, call seeker AS, group selector GW and line selector LW . The current surges are transmitted in a manner not shown from the subscriber Tzzz via the line selector LW, group selector GW, call seeker AS to the winding II of the relay J, which passes the current surges to the lines 5 i, 52 with contacts 69i.

After the consultation call has ended, the person making the request can use the Initiate switching back to the exchange line or the one called in the inquiry Participant pick up the outside call. If the latter is the case, then this is the connection path the same as when establishing an incoming exchange connection. ' Night connections Is the extension officer z. B.

not at the place during the night, the night switch NS is thrown , whereby the intercom NSt is marked for receiving exchange connections. If an outside call comes in via the outside line, then the relay P2 is energized by energizing the relay AR via contact 88a2 ^, which holds itself via contact 98p2 when after calling the intercom NS it reports itself and the relay S is energized and the holding circuit for relay P2 is completed via contact gos. Relay P2 has switched through the voice line to contacts gipz and 92p'2. The night station NSt is now connected to the exchange line AL and can accept the call and, if necessary, forward it to another desired intercom station by the intercom station NSt establishing a query connection in the same way as for outgoing trunk connections, according to which the subscriber called in the query does Outside call can take over in the manner described. When setting up the inquiry path through the night station NSt, a connection option is also provided if the subscriber called in the inquiry is busy. The series of current impulses sent by the intercom station NSt are picked up by relay S and transmitted to winding IIl of relay l. Relay J actuates contact 69i, so that the current impulses are given to inquiry line 70, 7i. Relays V1 and V = are energized during the series of impulses. By opening the contacts prevents 77v2 and 78v2 is an influence of the relay X1, which is used to introduce Recall & Umlegeumschaltungen until a short time after shock administration, when connecting to the night position the Ext also. Relay P2. This will after the end of the current surge. row, namely in the time in which the relay V-1 has already dropped out, but the contacts of the relay V2 are still in the working position, earth connected to the line 71 via the contacts 74P2, 73v1 72v2, 63z, 85111 ', whereby the differential relay Q in the line selector LW can be excited and held, namely after the last series of impulses in the temporary test time of the line selector, in which the relay V has already dropped out, but the relay U is still energized. In this way, in the same way as when an incoming exchange connection is established, which has been forwarded by the officer, the intrusion to a busy subscriber is initiated. s Prevention of intrusion through call stations equipped with an earth button.If the subscriber Tnl has established a connection to the subscriber Ttt2 and the subscriber Tn2 is busy, the call switching by the subscriber Tttl is prevented in the following way: If the test time of the line selector LW has ended, ie relays V and U have already dropped out, a circuit for relay B is established via -j--, Bontakte 93p1, 9-.u, relay B, contact 95m, shaft contact 58tv, contact 21p, -. Relay B opens contacts 4b and 5b and closes contacts 96b and 97b. This interrupts the speech wires, the ground connection on the part of the subscriber Tttl cannot act on the differential relay Q, and the relay A drops out. This opens the circuit of relay C through contact 7a. Relay C drops out, and the line selector LW is triggered in the manner already described.

If the subscriber Tttl presses the Tal key during the series of current impulses, relay Q is energized, but the following circuit is established as a result of the intermittent actuation of relay A when relay A has dropped out for relay M: +, contacts 98a, winding II of relay 1f1, contact 57g, shaft contact 58w, contact 2ip, -. Relay M responds and interrupts the circuit for relay A at contact 211t. Relay A can no longer be excited by the subsequent current closure. Relay A remains de-energized, and when contact 7a is opened, relay C also de-energizes. The line selector LW is triggered in the manner described.

Only if the subscriber Tttl succeeds in bringing about the ground connection in the test time of the line selector LW, which is only a few milliseconds, does a call switch to an occupied subscriber. But this is practically impossible.

According to the exemplary embodiment, the officer BA switches to the connection path by pressing the QT button, in that the relay Q1 is energized by pressing the QT button and the switching takes place through the contacts ii q.ql and ii 5g1. However, the design can also be such that the circuit of the winding I of the relay Dl runs via the normally closed contact of a key QT and thus the winding I of the relay Dl is de-energized when the key QT is pressed. It is now only the winding II of the 'relay Dl under current, so that the contacts of the relay Dl are brought into the working position and thus the connection to the contacts i iodl and ii idl takes place. Only one special key QT is therefore required for such an embodiment. The Relaia Q1 is not required in this case.

Claims (7)

PATENT CLAIMS: i. Circuit arrangement for telephone systems with dialer operation, in which there are authorized and unauthorized call stations, according to Patent 664 112, characterized in that after an intrusion stimulus that has become effective during the test period of a voter (LW) , an incentive for the means assigned to the connection path of the intrusion-authorized place (Relay Dl) is transmitted, through which the ability to speak at this point is prevented and the ability to speak can only be restored by a special switching measure at the point. 2. Circuit arrangement according to claim i, characterized in that after the activation stimulus has become effective in the line selector (LW), an incentive is transmitted via the speech lines to a relay (Dl) assigned to the connection path of the authorized place (BA) , which interrupts the speech wires. 3. Circuit arrangement according to claim 2, characterized in that the incentive is through -Potential crossing of the speech wires is transmitted. q .. Circuit arrangement according to Claim 3, characterized in that the potential crossing creates a winding (II) .a relay (Dl) receives current in the opposite direction and thereby to the Garbage is brought. 5. Circuit arrangement according to claim ,, characterized in that that the relay (Dl) causes the activation of a busy signal (LampeBL). 6. Circuit arrangement according to claim 2, characterized in that the relay (Dl) is assigned individually to the authorized point (BA). 7. Circuit arrangement according to claim 2 and 5, characterized in that after interruption of the speech artery and switching on a busy signal the authorized position by pressing a button the interruption of the speech lines eliminated. B. Circuit arrangement according to claim 7, characterized in that a relay (Q ') by pressing a button is excited that bridges the separation point of the speech wires. G. Circuit arrangement according to claim q. and 7, characterized in that by temporarily pressing the key the circuit of one winding (1) of the relay receiving the incentive (Dl) is interrupted and the resulting response of the relay. (Di) the interruption of the Speech vein is lifted again.