DE2342410A1 - Telephone subscriber connection - uses cross point routing to other circuits where subscribers are monitored on successive basis - Google Patents

Abstract

In telephone installations where the loop state of subscribers is monitored on a successive basis, the process can involve memorisation of the subscriber state and at least, several relays. This system concerns an installation of the type where each subscriber is connected via coupling stages to a group of connection units. The group has routing finders that identify the loop state of the subscriber instrument. Evaluators recognise the diminution of loop current or the open condition when the hand set is in place. The coupling stages can be Triac cross-points and may be controlled by diodes.

Description

Circuit arrangement for a telephone system, in particular telephone branch exchange, with electronic coupling points,

The invention relates to a circuit arrangement for a telephone system, in particular a private branch exchange system, at the subscriber stations via electronic crosspoints of one or more switching stages with connection sätjöen and line transmissions are connected and these crosspoints from a central control device when arriving Connections the connection path to the selected, marked subscriber station and, in the case of outgoing connections, the connection path between the calling subscriber station and a switch through a free connection set or an exchange transmission and during an existing connection temporary couplings to other connection sets, line transmissions and participants are made and at least the line and subscriber station addresses originally involved in a connection remain stored.

In known telephone systems with electronic crosspoints, the crosspoints are individually from the central Control device controlled by marking and by means of a route search. The crosspoints once switched on remain held as long as there is a holding current for the individual crosspoints. When the Connection, the holding circuits are separated. Are these electronic crosspoints, for example thyristors, call activation and deactivation in the subscriber circuit is necessary, since there is no direct current monitoring via the thyristors for controlling the call disconnection is possible. Such electronic components are used as crosspoints used, which carry the direct current in both directions.

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let, for example, double-directional thyristors, triacs, these have the property that they bein .Zero crossing of a signal alternating current from the controlled State in the rest position. This means that the speech path crosspoints with each Zero crossing of the alternating ringing current would have to be controlled again. The known crosspoint controls are for this purpose not suitable.

In a circuit arrangement that has already been proposed, in order to avoid the disadvantages of the aforementioned known Arrangement of each speech path crosspoint or each crosspoint pair in such a way with an auxiliary wire and with one therein lying control crosspoint coupled that the control crosspoints controlled in the course of the connection path marking automatically control the assigned crosspoints in the speech path and thus the connection path switch through. With this arrangement, however, a galvanic coupling can be used with an existing voice connection arise when the electronic crosspoints switched in the speech path are connected directly to the control crosspoint are. In order to avoid this, the pilot wire would have to be after the connection has been finally switched through be separated. Then, during the existing connection, there is again a signal alternating current via the connection path transmitted, the pilot wire is to be coupled through again. In addition, if a connection is tTmoupled, For example, in the event of queries and transfers, the addresses of those involved in the original connection are saved Participant parts and, for example, transfer of office provided will. This means a corresponding memory expenditure.

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The purpose of the present connection is to the additional effort for the subsequent, renewed connection of the pilot wire and for the storage the addresses of the subscriber stations involved in the original connection and trunk transfer without significantly changing the system design.

This is achieved in that first an auxiliary wire is marked via corresponding crosspoints between a Subscriber station and a marked connection set or a marked line transmission switched through and then in this pilot wire effectively switched light-emitting diodes ziigeordered, switched in the speech path control electronic crosspoints.

In this way, a galvanic coupling of the pilot wire to the speech wire is avoided and in a simple manner This means that the pilot wire can remain switched through during the existing connection. This also leads to that on the part of the central control device, the pilot wire is held even when connections are recoupled, so that in this case additional storage means for the addresses of those involved in the original connection Subscriber stations and line transfers are avoided. This has the consequence that according to a further training of the invention by separating the holding circle of the speech path crosspoints regardless of this, the auxiliary wire for storing the subscriber parts originally involved in the connection after initiating a recoupling, the original connection or takeover is held back to enable a connection.

Based on the drawings is an embodiment of the invention described.

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I? Ig.1 shows a private branch exchange with a switching matrix with coupling points consisting of triacs as double-directional thyristors.

The 2 shows a PBX with a coupling field consisting of opto-triac crosspoints. These modules, referred to as opto-triacs and used here, consist of two triacs (double-directional thyristors) controlled by a light-emitting diode, the triacs being in the speech wires and the light-emitting diode in the auxiliary wire.

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C ■ **

Pig.3 shows the integration of the exemplary embodiments according to Fig.1 and Pig.2 in a private branch exchange an overview. 4 shows the application of the so-called "rate effect" in Pig.2. The subscriber station is in the PBX shown on the basis of Pig T1 via the connecting line VL and the switching stages A, B, C of the switching network KP, for example, sit the connection set V1 connected. The coupling field shown consists of triacs, as double-directional thyristors, which have the property to pass both direct current and alternating current. But with each zero crossing of the alternating current, these triacs are switched off. In order to be able to switch these triacs through each time they are switched off, the additional c-wire with the crosspoints is over the assigned thyristors coupled. A permanent control circuit should be provided via this c-core at least until the connection is switched through exist in such a way that the triacs after each zero crossing of the alternating current, for example the ringing change - current, can be activated again.

The hook switch contact is in the idle state of the subscriber station 1GU in the rest position and there is no loop to the connection set. If the subscriber now lifts the receiver at subscriber station T1, this fork switchover contact 1GU is actuated and via the contacts 2nsi and 3nsr connected in parallel, there is the normal loop with the prescribed resistance value, which at conventional systems in the subscriber circuit is recognized and thereby the connection to the connection set either by initiating corresponding, directly controlled voters or by initiating identification or after scanning The Y / egestellung is made by a scanner with subsequent identification and a marking.

The system according to the present exemplary embodiment is based on a completely different principle. The addresses of the subscriber stations for which an incoming or outgoing connection already exists are stored in a central location (A1).

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Based on this, the central controller AT for the subscriber stations not yet marked in this allocation memory cyclically the connection to a ready, freely marked connection set. Read this cyclical connection of all subscriber stations with this free and "provided" Connection satζ takes place until a subscriber station connected to a connection set in the cycle mentioned which is currently issuing an input assignment for the establishment of an outgoing connection. He recognizes this Loop status evaluated AW ^ of the connected connection set. This evaluator AW. is assigned to the Α side of the connection kit. Is then this subscriber station with the provided Connection set finally connected, i.e. is If this connection set is now also centrally marked as occupied, a new connection set is available as free and in the cycle mentioned successively with the subscriber stations that are not yet centrally stored in a memory (of the AT) are marked as occupied. If all the connection sets are busy, either a trunk transfer or a Auxiliary set provided and used in a known manner.

A subscriber circuit is not necessary on this basis, since if, for example, the subscriber of subscriber station T1 who has lifted the receiver and the loop over the contact 1GU produced in the above-mentioned manner, in the aforementioned hold-through cycle from the central control device connected to the connection set V1 via a correspondingly set path via the switching stages A, B and C of the switching network KP and is recognized as the caller. This is because it is now used by those monitoring the loop status of the subscriber stations Switching means of the evaluator AW assigned to the connection set on the A side. the closed loop of subscriber station T1 and, since a scanning cycle is running for this subscriber station, an existing connection does not exist causes the established connection to be maintained. The dialing character is based on this status identification. transfer.

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The triacs of the switching matrix KP, via which the path is maintained, remain from the c-core when the dialing character alternating current zero crossing switched through.

The dial numbers now given by the subscriber station are matched with the resistance values of the resistor R1 and
of the transformer Ü in the form of current reduction indicators that
for example, cause half the current in the evaluation means of the connection set, transmitted. Biese current reduction
does not lead to the triggering of the one in the intercom
Triacs. When the first pulse is received, the dialing signal is switched off in the connection set in a known manner. The Y / ahlikennzeichen received by the dial receiving means are evaluated there or also centrally and lead in a known manner via the central control device to the setting of the connection path to be established. If this Y / eg is set, the evaluator checks AW _B in the connection set, that of the B-side
is assigned, the loop status of the coupled, desired subscriber station. If the loop is open, the call is on hold. If the loop is closed and the subscriber is already busy, the call connection does not take place, since the evaluator AW 'detects that the loop is closed. However, due to the busy identification in the occupancy memory, the B connection and a busy indicator connection can also be omitted from the outset
on the Α side.

If the earth button is pressed during the existing connection, so is also here in a known manner, since one of the speech wires is short-circuited, this indicator in the connection set A-side assigned evaluator AW. recognized. When the receiver is hung up, the current value is again equal to zero and this is also determined by the evaluation means of the connection set is evaluated and leads to the release of the occupied crosspoints and other facilities, in particular of the connection set.

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• f.

It can be seen from the above that the subscriber station T1 transmits identifiers with full current, half current and zero current value. This means that there is a distinction between optional and trip indicator zero current value, i.e. a distinction between the dial number and your release number does not have to be provided, so that the monitoring of the pulse length is unnecessary.

From the above it can also be seen that both the signaling, as well as the call feed and call shutdown, the latter takes place in the connection set for incoming connections. This is possible because the triacs work as bidirectional thyristors and accordingly the current in "let through in both directions. This, however, with the restriction that the triacs are switched off at each zero crossing of the alternating current. To make sure that the Triacs of the connected speech cores after each passage through liull of the alternating current immediately through again, is the c-wire with the auxiliary wire crosspoints assigned to the speech wire crosspoints, consisting of switched through at least until the called subscriber station is reported via the transistor Thyristors, provided.

It should also be mentioned that there is a control for the control of the crosspoints to be controlled due to the route search these crosspoints both in the mentioned cycle and in the case of targeted control for an incoming connection anyway necessary is. This control takes place via the thyristors mentioned, which are located in the auxiliary wire c mentioned. To this In this way, the control points for the crosspoints are used several times to control the triacs in the speech cores. In this c-wire there is also a switching element, for example the transistor T, which can be used to prevent a Speech transmission via the c-core is to be blocked. This c-core is guaranteed from the time of activation to at least The called subscriber reports the control of the connection set assigned transistor and thus the maintenance

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234241U

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Maintaining the connection path and control of the triacs independently whether the triacs are temporarily switched off by alternating current signals or not. The voice alternating current has on holding and dropping the triacs has no influence, because this is superimposed on the triac holding current.

These triacs still have the advantage that they are self-protecting are, because only at a higher voltage above, for example, 4-OO V, that is more than 6 times the operating current it is possible to destroy these elements. It must be assumed, however, that every subscriber station receives overvoltage protection. This means that the system is sufficiently troublesome.

When there is an incoming connection, the connection is switched through by marking the desired lifting point. In this Case, the control of the extension takes place specifically and the The call is switched off depending on the person recognizing the loop Switching means in the B-side evaluator AWg of the connection set.

The transistor T already mentioned above in the connection set is in the · c-core, after the called subscriber station has reported or after the outgoing connection has been established, i.e. after the point in time after the AC signals from the speech wires are safely switched off, blocked, so there is a risk of galvanic coupling and thus cross-talk to belittle. Must have a current signal during an existing connection switched on / grounded, then the c-wire must both to the calling subscriber parts, as well as to the called subscriber station be coupled through again, which is possible without additional effort, because the occupied path is because the speech lines are still connected are, as well as the participating participants themselves, still known.

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If the earth button is pressed during an existing connection, this is, for example, a recoupling to a different connection set necessary.

When the earth button is pressed, the subscriber station in question T1 is over the switching network KP, for example, connected to an exchange transmission. . '' -

This Erdtasteridruck is in the A-side evaluator AW. established, because in a well-known way, one of the speech veins, e.g. the b-vein, is de-energized. As a result, the triacs in this Vein become ineffective. To switch on these triacs immediately, the c-wire must be switched through again. For this reason, the connection set, here e.g. the exchange transmission, is an address memory ASp assigned to receive the address of the A subscriber.

The crosspoints of the c-wire and thus the crosspoints in the relevant The said speech artery can now be activated and switched through again. After letting go of the earth and again Switching through the said voice wire can v / ground the c wire again.

By pressing the earth key mentioned above, if the recoupling is not takes place via a switch in the trunk transmission, the original connection path can be triggered from the trunk transmission and a recoupling to an internal connection set can be initiated in a known manner from the central control device. The new setting of the connection route is carried out by using the stored subscriber address and the stored transmission address to set the crosspoints of the c-wire determined by the route search and thus the corresponding crosspoints of the speech wires are controlled. The original Y / eg stays connected to the subscriber and trunk transfer address in a particular

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Memory saved. In this way, through appropriate,

* '' calling

"known measures that originally γ subscriber station or the queried subscriber station are connected only to the originally occupied transfer of office and thus with the waiting office subscriber.

If the transfer takes place on the inquiry call in the exchange transfer itself, the path to the transfer of the office can remain during the inquiry.

Both when the exchange connection is withdrawn by the A-subscriber and when the exchange connection is transferred depending on the B-subscriber's keystroke, the one called speech artery is interrupted by pressing the earth key and is carried out as above to initiate the inquiry described the readjustment of the interrupted speech vein by activating the c-vein again and controlling the corresponding crosspoints there. Purely for the renewed setting of the A-side pilot wire, the address memory ASp mentioned is intended for receiving the addresses of the Α-participants and for the transmission of the B-side through-connection of the c-wire of the address memory BSp for receiving the address of the B-participant. After renewed activation of the crosspoints of the speech wire, which was de-energized by pressing the earth button *, this pilot wire is released again.

When described with reference to Pig.1 conditioning not just the Rufan-, by using the triac and shutdown the connection kit carried out, which is not possible when using thyristors, because there the Rufan- and shutdown must individual user from the subscriber circuit take place, but the complete subscriber circuit and the existing galvanic isolation for decoupling the direct current from the thyristor coupling points can be saved.

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As already mentioned, this is achieved in that the subscriber stations in the system described cyclically with a as freely marked and provided connection set are connected and checked for the loop status in such a way that this takes place only for the subscriber stations marked as free in an occupancy memory. This allocation memory is designed in such a way that either in each case the occupancy identifier ^ the address to identify this occupancy status enrolled or else..which is more appropriate, too Already existing subscriber addresses in a certain sequence are inscribed with an occupancy identifier and again when they are vacant This cyclical connection of a provided Connection set with not yet occupied subscriber positions means a simple option for the parallel use of a successive connection test and thus for the puncture test of the visitor, the crosspoints and the paths. For this purpose it makes sense to use the successive through-connection of connections between a marked connection set and the free subscriber stations one of the Fuiikti ons examination adapted scheme to carry out on consciously controlled in this way to check all connection options, crosspoints and V / ege.

Are in the circuit described above according to the embodiment in Fig. 2, the newly developed opto-triacs are now used instead of the triacs, i.e. they are in the speech arteries Triacs switched, which are controlled by LEDs connected in the c-wire, this has the advantage that during the existing Connection a separation of the c-wire to avoid a galvanic coupling is not necessary, because these LEDs do not have the property of galvanic coupling. This also means that the existing connection path is via the c-core remains continuously stored and, in contrast to the exemplary embodiment according to FIG. 1, address memory for receiving the A subscriber address and the B-subscriber address in the connection records

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COPY

and trunk transmissions in which an earth key identifier is recorded and evaluated can be omitted (ASp and BSp).

In this way, if, for example, a consultation call exists and the exchange connection is withdrawn by the subscriber station originally calling or a transfer to the subscriber station inquired about is required is, always the address of the originally calling and / or the relevant transfer from the central control device due to the held pilot wire setting can be determined and the necessary recoupling can thus be carried out. It stays It should also be mentioned that the holding circuit for the speech path crosspoints is separated when a recoupling is initiated has been while the c-core is held. The aforementioned disconnection to enable reclosing of speech path coupling relays takes place from the central control device only when the marking of the c-wire for the connection is withdrawn or reassigned.

The control of the auxiliary wire crosspoints, thyristors assigned to the speech wire crosspoints, triacs, and thus also the light-emitting diodes takes place in the embodiment shown in FIG. 2 again via the central control device and the path finder. As in the exemplary embodiment according to FIG. 1, the cyclical connection between a connection set marked as free and a subscriber is to be carried out by a central scanning device of the central control device AT which determines a certain sequence of connection and checks the occupancy state beforehand. The other processes correspond to the processes that have already been described with reference to FIG .

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the overview in Figure 3 shows that the above said scanning device a connection set and office transmission markers VM and a subscriber marker TM contains, whereby the connection set marker is always set to the next free connection set and the Participant marker successively controls the free participants. As mentioned, this control is depending on the subscriber's occupancy identifier, which is recorded in the occupancy memory BSp. These Allocation identification takes place, for example, by writing in an allocation bit to the respective subscriber address. If the central control device is occupied for another process, this scanning process can be independent run away. Only if a route setting from the central control device is made, the cyclic subscriber scanning process is to interrupt what the central control device initiated by a corresponding command to the scanning device AT.

In Fig.3 is both the control of the internal connection sets HVS as well as the control of the office transmissions AVS

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its activity as an auxiliary sentence "when all connection sentences are occupied indicated.

In Pig.4 is a for the embodiment of Figure 2 other type of connection override shown, namely without searching for a route using the so-called "rate effect".

In an article by the International Telephon and Telegraph Corp. in the journal Telephony, December 6,1971 is the exploitation the aforementioned "rate effect" on the basis of various exemplary embodiments for "switching through a speech path." described via PNPN diodes. From this description it can be seen that there are many possible connection paths due to the properties of the named PNPN diodes and the different ones timed connection automatically a Y / eg as preferred Path results when you mark the start and end point of the connection to be switched through. In the case of the article mentioned described arrangement is the so-called single-core speech path through-connection.

In the arrangement according to FIG. 4, the marking of the c-core at the starting point and at the end point by identifying the connection set made via the VSK and the marking of a participant via the scanner ATK and switches this c-wire according to the so-called "rate effect" when the marking is completed depending on the free marking of the subscriber station was. This means that an overvoltage first occurs via a corresponding indication point IK of the subscriber station the c-core is determined and the marking circuit for this subscriber station in the control only if the voltage remains normal AST completed and the c-core is coupled through in the manner mentioned. '

After switching through one of the possible connections between the connection set and the subscriber station via the correspondingc: PNPN diodes D1, D2 and D3 are switched on via the light emitting diodes LD1, LD2, 1D3 also the through-flow of the triacs Ta1, Tb1 as well as Ta2, Tb2 and also

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Ra5 and Rb3 causes. After this through-connection, the c-wire remains switched through for the duration of the connection and the pre- Corresponding to those described with reference to Pig. 2 and Fig. 1 Operations. In this exemplary embodiment, too, there is a special A. address memory and B address memory for storing the corresponding participant addresses and the renewed activation of the b-core when pressing the earth button is not necessary. The saving dee Path searcher and the saving of the occupancy memory for the identification of the respectively occupied subscriber positions costs this arrangement according to Figure 4 an additional indication point per participant. But the connection is swegedur chs chal tung faster, which is advantageous for the time required to carry out a scan cycle of the subscriber stations. The connection set is designed in the same way as in the exemplary embodiments according to FIGS. 1 and 2.

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Claims (3)

P_a_t_e_n_t_a_n_s_g_r_ü_c_h_e 1. Circuit arrangement for a telephone system, in particular telephone branch exchange, at the subscriber stations via electronic coupling points of one or more coupling stages with connection sets and line transmissions are connected and these crosspoints are controlled by a central control device for incoming connections to the selected, marked subscriber station. and, for outgoing connections, the connection path between the calling Subscriber station and a free connection set or through an exchange transmission and during an existing connection temporary couplings on other connection sets, line transmissions and subscribers made v / ground and at least the originally Line and subscriber station addresses involved in a connection remain stored, characterized in that first an auxiliary wire via corresponding crosspoints between a marked subscriber station and a marked connection set or a marked line transmission switched through and then in this pilot wire effectively switched light emitting diodes associated electronic crosspoints switched in the speech path through control. 2. Circuit arrangement according to claim 1, characterized in that by separating the holding circuit the speech path crosspoints regardless of the pilot wire for storing the originally on the connection Participating subscriber stations after initiating a recoupling remains in order to withdraw the original connection or to enable a takeover of a connection. VPA 9 / 61o / 3167c 509813/0422 " ¹⁶ " BATHROOM ORIGINAL ¹ 3. Circuit arrangement according to claim 1, characterized in that the light-emitting diodes and the associated speech path crosspoints consist of "known" opto-triacs ", a light-emitting diode and two double-directional thyristors ¹ (triacs) controllable by light-emitting diodes, VPA 9 / 61o / 3167c 509 813/0422 BAD ORiGINAL Blank page