DE822564C - Circuit arrangement for the mutual blocking of a dialer and a caller - Google Patents

Description

The invention relates to a circuit arrangement for an automatic signal system, e.g. B. a telephone system, for the mutual blocking of a voter and a call seeker, of which give access to the corresponding outputs to the same output circuits.

In the case of call-seekers, the one calling Line corresponding output marked by the multiple connected marking contacts this output in the group of first call seekers are provided with a potential that from P 'potential deviates from the marking contacts of non-calling lines. It's already suggested to mark the exits of second call seekers in a similar way.

The setting of a voter is accomplished by means of a device generally associated with a register controlled, which tests the potentials of the marker contacts hit by the test arm one after the other. As soon as a marking contact ao is found which has the desired marking potential, brings the control device the switch to a standstill and the potential of the marker contact changes in such a way that a control device that controls another caller when reaching the hit Output cannot respond.

The potential change should take place as soon as possible after the test, otherwise there is a risk there is a second switch that has an eye

look after the first switch has reached the relevant output, still at the marker contact Marking potential would be found and also be brought to a standstill at this output would.

In known circuits, this is done by checking the marking potential and its Change by electronic means. The exit is then finally occupied by the

ίο marking contact by means of a contact of a Occupying relay, if necessary via the selector's test arm, with a point of constant potential connected. The one between the beginning of the test and the change in marking potential With these circuits, the elapsing time is not determined by the raising time of a relay conditional.

A control device of this type has already been proposed.

Such control devices can also be used to set voters to a desired one free output can be used. The marking contacts of free outputs have a different one, e.g. B. a lower potential than the marking contacts of occupied outputs. As a result of the electrical In this case, too, the control system changes the potential of the marking contact so quickly that another voter is unable to substantiate the outcome in question.

If, as will often be the case, the control device forms part of a register, the same control device can advantageously be used to successively the cascades of call seekers and voters.

Control devices that can be used for this purpose have also been proposed been.

In circuits in which corresponding outputs from voters and callers to the same Giving access to output circuits, which z. B. occurs with final voters and first call seekers, to whose contact banks the same subscriber lines are connected, you come across practice on difficulties.

In known circuits there is the possibility that during the time in which a searcher a calling line is looking for, the line is seized by a final dialer that is also searching for this line will. The known circuits in which the exit is immediately at the beginning of a call is made busy for final voters have the disadvantage that when a participant puts the listener in an instant when the line is seized by a final dialer, the searcher marker contact for a short time, d. H. until a busy relay of the final selector is raised when calling is highlighted and a call finder z. B. is looking for another calling line from the final selector Line made busy is also busy.

The invention overcomes these disadvantages and is characterized in that the voter and Finder marker contacts of corresponding outputs continuously via linear or non-linear Resistors are coupled together, and the change in the potential of a marker contact of one kind (meeting a voter on a desired outcome) is so large that over the coupling mentioned, the potential of the marking contact of the other type is carried along and after the change can only have such values that a voter of the other kind (proving Final selector) cannot be held at a corresponding output. So if z. B. a final voter occupies the line, the finder marker contact assumes a potential at which a Control device of a call seeker can not respond, regardless of the fact whether the receiver is on the hook or not, or is picked up after the assignment.

If voters are used alternately as a call finder or as a final dialer, the Separate marking contacts arranged on the selector for both markings.

Such combined call seeker end dialers are connected to corresponding outputs of second call seekers and last group selector connected, so that in this case too it must be prevented that corresponding Outputs can be occupied by a call finder and a group dialer at the same time can.

The invention is explained in more detail with reference to some of the Schematic exemplary embodiments shown in the drawing.

In the circuit of Figure 1, the selector and finder marker contacts are across a resistor coupled with each other.

In the circuits according to FIGS. 2 and 3, the coupling takes place via oppositely polarized ones Junction cells with unequal bias voltages take place. In the circuit of FIG. 2 are first Call seeker and final selector designed as a separate switch, while after switching 3 the two functions are combined in one switch.

In Fig. Ι Ab denotes the device of a subscriber who is connected via the voice lines L ₁ and L ₂ to the a and /, »- contacts of corresponding outputs of a group of first call seekers OZ ₁ and a group of end selectors EK . The figure shows only one switch of each group. Corresponding output contacts of the switches in each group are connected to one another in multiple ways in a known manner. The a and fr contacts of both groups are connected to each other, but the (/ contacts are not.

The voice line L ₁ is connected via a resistor R ₁ to the negative pole Λ ^{Γ of} a battery, not shown, the positive pole of which is grounded. The voltage of the battery can e.g. B. 60 V.

A resistor R _{2 is} connected between the speech line L ₂ and the point p. The point p is directly connected to the rf marking contact of the relevant subscriber output of the first call seeker OZ ₁ and via a resistor R _{: i} to the positive terminal of the battery (earth).

The point p is further coupled via a junction cell to the control point D of a device OD which responds to calls and which is common to the subscribers connected to the outputs of OZ _1. The circuits of the other participants are similarly coupled to control point D via junction cells. The subscriber line circuit described here is of a known type, and it

ίο manifold changes can be made to it will.

The / J marking contact of the subscriber output of the customer voter group EK, point q, is on the one hand via a resistor i? ₄ connected to the point p, on the other hand via a resistor R ₅ to the negative pole X of the battery.

The resistors R ₁ , R ₂ , R _A , R ₄ and R ₅ are

equal to 15000, 15000, 30000, 10000 or 20000 ohms.

As long as the listener is on the hook, _{the subscriber connection formed by the speech lines L 1} and L ₂ via the subscriber device represents a high resistance, so that only a very low current flows through the resistor R _2. The potentials of the points p and q are then about 3 ° V and -40 Y, respectively. The junction cell g is blocked at these potentials of the point / », and the device OD is out of operation.

The control devices which control the setting of the call seeker or final dialer and which check the potentials of the points p and q via the arms of the switches are set up in such a way that they only respond when the potential of the tested marker contacts is lower than -35 V. A call searcher cannot be held at the relevant exit, but a final selector can, at least if the exit corresponds to the desired number.

The numerical setting of the final selector takes place in the circuit according to FIGS. 1 to 3 with the aid of a DC voltage comparison method. For this purpose, the ^ contacts of the final selector EK are connected via resistors R ₁ to points / ⁵ , which have a potential indicative of the number of the various outputs.

The control device, which is assigned to a final selector during the setting, electronically checks these numerical potentials via the switching arm e ₂ , while the checking of the occupied or unoccupied state takes place via the switching arm D _2.

As soon as the desired output is reached, the control device will respond if the output is free, in which case the potential of point q is suddenly increased to earth potential and the movement of the selector is stopped.

The point p assumes a voltage of ο V.

Does the called subscriber pick up the

When the handset is removed, the subscriber connection closes and the potential of point p drops to -12 V. The point / »has such a potential throughout the process that a call seeker cannot stop at the exit.

Neither can the device OD responding to calls by lifting the handset after the final dialer has seized the output, since this device is set in such a way that it can respond only when the potential of point D falls below -35 volts. If, conversely, the subscriber calls, the subscriber connection closes when the receiver is lifted and the potential of point p drops from -30 V to -40 V. The point q assumes a potential of -46.5 V, so that a final selector could still stop at this output.

The junction cell g becomes conductive and the control point D of the device OD assumes a potential of -40 V, so that this device becomes active, whereby call seekers are actuated, possibly in several stages in cascade, and search for the calling line.

The output of the calling line has a potential of -40 V at the d-marking contact marked.

As soon as the test arm (J _{1 of} a call seeker OZ ₁ hits the marking contact, the control device responds, the call seeker stops and the potential of the switching arm and thus point p is increased electronically to ground potential. As a result, another call seeker can use the relevant output The potential of the point q increases at the same instant up to -20 V, so that the output has also been made occupied with respect to the final selector, the junction cell g is blocked and the device OD becomes ineffective.

If a final dialer had seized the output during the call state before the call seeker had found the line, the control device assigned to the final dialer would momentarily increase the potential of point q to ground potential, so that point p would have assumed a potential of -12 V. the value at which the control device of the call searcher cannot respond.

So it is not possible that two voters at the same time on one and the same outcome can be adjusted.

In another embodiment of the invention, the coupling resistor R _{4 is replaced} by a non-linear resistor, the resistance of which is a direct function of the voltage applied to the resistor terminals, lower with a higher applied voltage. In the rest position, the voltage difference between points p and q is relatively small, e.g. B. -10 V and the resistance value of R ₄ high. If the potential of point p is changed during a call in such a way that a call seeker can stop at the relevant output, the value of R ₄ remains high, since the voltage difference between p and q is lower than in the previous case.

The potential of the point / »can change within certain limits without the

The circuit coupled via the resistor R ₄ to the point p creates a significant load on the subscriber line circuit.

However, if the output is occupied by a call seeker or a final dialer, the potential of the associated marker contact changes in such a way that the value of i? ₄ drops to a lower value and the potential of the other marker contact is carried along,
ίο The resistance R _t can also come from a gas pipe, e.g. B. a neon tube to be replaced. The tube is extinguished in the idle position and in the call position and becomes conductive as soon as a switch hits the output. No power is drawn from the battery in the rest position. In this circuit, however, relatively large changes in the potentials of the marker contacts must be applied in order to ignite the tube.

In the circuit according to FIG. 2, the marking contacts of corresponding outputs of call seekers and final selectors are coupled to one another _{via two junction cells Jf 1} and g _{2 connected in parallel and polarized in opposite directions.}

The junction cell g ₂ is connected directly between the marker contacts and polarized in such a way that it becomes conductive when the potential of the point q is higher than that of the point p . In the rest position, U _{2 is} blocked.

In series with the junction _{cell U 1} is a resistor i? ₉ switched. The common point r is connected to earth via a resistor R _8. The resistors R _s , R ₉ and R ₅ form a voltage divider located between the terminals of the battery, with the aid of which a bias voltage is generated in the reverse direction of the junction cell g _t via the resistor R _9. The speech line L ₂ is connected to ground via a resistor R _1. This circuit of the subscriber circuit has advantages over the circuit according to FIG. 1 when leakage currents occur between the speech lines.

In the rest position, the resistor R _{8 is connected in} parallel to the series circuit R ₇ , R ₂ and ^ ₁ . A small current then flows through the junction cell.

With a certain choice of the different resistances, the potentials of the points p, q and r in the rest position are equal to - 30 V, - 45 V and - 30 V.

When the control devices are again set up so that they only operate at one potential can respond that is lower than -35 V, a final selector can in the rest position, however a group selector cannot be set to the output.

If the participant connection is via the

From device at the beginning of a call closes, the voltage of the point p falls to about - 45 V.

The junction cell g _i is then blocked and the junction cell g _{2 is} not or barely conductive.

In addition, the device OD is operated.

When a call seeker now reaches the output marked by -45 V, the control device increases the voltage of the marking contact immediately up to ο V. The junction cell g _i becomes conductive and the potential of point q is carried to -30 V.

By occupying the exit using a call finder, EK's d-marking contact assumes such a potential that a final dialer can no longer occupy the exit.

The control device of OT ^ _{1 then} connects the c ^ arm of the switch via a relay contact to earth for the final assignment. The resistance R ₁ is equal to the value of the parallel connection of R ₇ and R ₂ , so that the speech lines L ₁ and L ₂ are balanced under these circumstances for alternating currents with respect to earth. If the output is seized by a final selector before the call seeker has found the line, point q is immediately brought to ground potential. As a result, g ₂ becomes conductive, and the point p also assumes earth potential, so that the group seeker can no longer be kept on the line.

If the switching arm d _{2 is then} connected to earth via a relay contact, the speech lines L ₁ and L _{2 are} balanced again, since the junction cell g _{2 is} conductive.

Both in the event that the line is from a call seeker, as well as in the event that the line is occupied by a final selector, the speech lines are therefore for alternating currents with respect to earth balanced.

3 shows a variant of the circuit of FIG. 2, in which combined call seeker end dialers OK are used, which are connected to corresponding outputs of a group of second call seekers OZ ₂ and a group of last group dialers GK .

3 shows, for example, a possible circuit of the switch OK . However, as can be seen, this circuit can be changed in various ways.

It is assumed that the switches do not have a fixed rest position. The c-contacts of the OK switches act as finder marker contacts. Whether the outputs are free or occupied is checked via the d-arms if the OK switch is used as a final selector.

The subscriber line circuit is otherwise completely similar to that of FIG. 2 and corresponding parts are provided with the same reference numerals. As a switch OK. can be assigned both via a call finder OZ ₂ and via a group selector GK , the switches OZ ₂ and GK must be able to mutually block their respective outputs. For this purpose the finder marking contacts cJ and selector marking contacts dJ are coupled to one another via similar networks U ₁ ', g ₂ ', R ₈ ', R ₉ ', RJ as in the subscriber line circuit.

The mode of operation of the circuit is as follows: If the subscriber Ah lifts the handset for a call, an on the basis of FIG. 1

and in the manner described in Fig. 2, the c-contact of the output of OA * is marked as calling and the call-responsive device OD is actuated, which supplies a call signal to a free register. In addition, those outputs of OZ _{2 are} marked as calling via which the ' calling subscriber line is accessible.

The marking contacts of the switches OZ ₂ , which correspond to the outputs to which the group switches OK are connected, which are assigned to the respective subscriber group, are each via the normally closed contact h ^{: s of} an occupancy relay H from OK via a point P ₂ via resistors i? ₁₀ connected to a common point A. In the rest position, the points P _{2 have} a potential of -30 V, which is caused by the voltage division j across the resistors R _i3 , which connect point A to 'earth, R ₁₀ and R _s ' . When OD is actuated, point A is connected via resistor R ₁₂ to point N ' , which has a potential of -60 V, as a result of which the potential of the marking contacts is reduced from OZ _{2 to -40 V.} The control device of the register can now respond when a switch OZ _{2 reaches} an output marked in this way. After the control device of the register has set a call seeker OZ ₂ in motion, the potentials of the marking contacts are checked via the switching arm d _t '. As soon as one of the calling outputs is found, the control device stops the selector and electronically increases the potential of the marking contact made up to earth potential, whereby the potential of the d ₂ 'marking contacts of the selector GK is carried along,; and the exit for group dialers is made busy.

In addition, by earthing the marker contact O ₁ ', the potential of the points P _{2 of} the other switches OK of the group is influenced in such a way that the call status of the other outputs from OZ ₂ also comes to an end. If a marked output is occupied by a group selector GK during the call state, the potential of the dj 'marking contact of OZ ₂ is suddenly increased to earth potential by grounding the d ₂ ' contact of GK and becoming conductive of g _{2, so that} the output is immediately occupied for call seeker OZ ₀ . The call status of the other outputs from OZ ₂ is now also coming to an end. However, after the hit switch OK has been set to the desired number, the busy relay H is energized, whereby the normally closed contact h ³ opens, and the call marking potential of the other outputs of OZ ₂ returns. The caller OZ ₂ can then stop at one of these exits. The disadvantage described above can easily be remedied in that in series with g ₂

a resistor is switched. ■

After an Atirufsucher OZ ₂ or a group selector GK has occupied a selector OK , the control device energizes the rotary magnet SM of OK _{by earthing the switch arm (J 1} 'or d ₂ ' via the normally closed contact h ¹ , and the selector is actuated _{The switching arm (J 1} 'or d _{2 is} connected to earth via a relay contact (not shown), whereby the output is finally occupied. If OK is active as a call seeker, the control device checks the potentials of the c-marking contacts of OK via the switching arm c and the switching arm C ₁ ' of OZ _2. If OK is effective as a final selector, the check of the vacancy or occupancy of the outputs is carried out via the d-Ατπι of OK and the arm C ₂ of GK, and the numerical characteristic voltage of the ^ -Contacts monitored via the f arms of OK and GK.

As soon as the calling line or the desired numerical output has been found, the control device responds and the output is assigned in the manner already described by electronically opening the switching arm C ₁ of OZ ₂ or the switching arm C ₂ ' of GK Earth potential is brought. The excitation circuit of SM opens and the switch O / C comes to a standstill. Then, by connecting the fc arm of OZ ₂ or GK to ground, the occupancy relay H is energized by OK. By closing the normally open contact h * , the relay H remains on GK via the earthed d-Arra of OZ ₂ .

The changeover contacts h ¹ and h ² switch the speech lines on immediately.

The normally open contact h ^s connects the c-marking contact of OK with the grounded rf arm of OZ ₂ or GK.

The normally closed contact h ⁵ interrupts the circuit of the negative pole N of the battery via resistor R ₅ ' to arm d ₉ ' of GK, and the normally open contact short-circuits the junction cell g ₂ ' so that the (/ contacts of OZ ₂ and GK directly with one another are connected.

Claims (5)

Patent claims: i. Circuit arrangement in an automatic signal system, in particular a telephone system, for the mutual blocking of a voter and a call seeker, from which corresponding outputs to the same output circuits Giving access, with voter marking contacts free outputs one occupied by the potential of marking contacts Outputs have different potential and finder marker contacts to be searched for outputs from the potential that other finder marker contacts different potential is supplied and the setting of each selector is controlled by a control device that controls the potentials who checks voter or searcher marker contacts electronically and those when they hit a desired one Exit stops the voter and immediately electronically changes the potential of the checked marker contact to a value at which a control device which controls a selector of the same type cannot respond, characterized in that the selector and finder marker contacts (d ₂ Fig. i, Fig. 2; d ₂ Fig. 3; (I ₁ Fig. I, Fig. 2; dj 'Fig. 3) corresponding outputs are permanently _{coupled to one another via linear (i? 4} Fig. 1) or non-linear (^ ₁ , g ₂ Fig. 2) resistors and the change in the potential of a marking contact (d ₂ Fig 1, Fig. 2; d. ₂ Fig x 3) of ^{e 'NEN} type (Auttreffen such a selector as OZ ₁ Fig ι to a desired outputs ^to g.). ^{is so} great that the potential of the marking contact (d _{t Fig. 1} , Fig. 2; Cl 1 Fig. 3) of the other type is carried along via the coupling mentioned and, after the change, can only have values such that a selector of the other type (occupying final selector e.g. EK Fig. 1) cannot be stopped at the corresponding output. 2. Circuit arrangement according to claim 1, characterized in that corresponding Viewfinder and selector marker contacts are coupled to one another via a resistor, its resistance value is a direct function of the value supplied via the resistance terminals Voltage and the lower the higher the voltage. 3. Circuit arrangement according to claim 1, characterized in that corresponding Finder and voter marker contacts coupled to one another via a gas-filled tube are. 4. Circuit arrangement according to claim 1, characterized in that corresponding viewfinder and selector marking contacts are coupled to one another _{via a parallel connection of two junction cells polarized in opposite directions (^ 1} , g ₂ Fig. 2, Fig. 3; g _lt g _{2 Fig. 3)} are that the first junction cell (g ₂ ) is connected directly between the contacts (d _l or d ₂ Fig. 2; c or d Fig. 3, U ₁ and d ₂ Fig. 3) and in the rest position of the circuit is blocked, and in series with the second junction cell (g ₁ Fig. 2, Fig. 3; g _t ' Fig. 3) a counter voltage is recorded which corresponds to the potential difference of the Alarkierungskontakte in the rest position or is greater. 5. Circuit arrangement according to claim 4, characterized in that a selector marking contact (d ₂ Fig. 2 _; Fig. 3; de, ' Fig. 3) via a resistor (R ^ Fig. 2, Fig. 3; R ₅ Fig. 3 ) is connected to one of the terminals (A * Fig. 2, earth Fig. 3) of the battery and a first pole of the second junction cell (^ ₁ Fig. 2, Fig. 3; gi Fig. 3) to a tapping point (r) a voltage divider connected between the second (earth Fig. 2, A * Fig. 3) pole of the battery and the selector marking contact (R ₈ , R ₉ Fig. 2, Fig. 3; R ₆ ', R ₉ ' Fig. 3) is connected, while the second pole of the second junction cell is connected to the corresponding finder marking contact (</, Fig. 2, Fig. 3; d ( Fig. 3). 1 sheet of drawings 2417 11:51