DE2342410B2 - CIRCUIT ARRANGEMENT FOR A TELEPHONE SYSTEM, IN PARTICULAR TELEPHONE EXCHANGE, WITH ELECTRONIC COUPLING POINTS - Google Patents

Description

Auxiliary wire, after the connection has been finally switched through, be disconnected. It will then during the existing connection again a Si

The invention relates to a circuit transmission system for a telephone system, in particular, the pilot wire is to be coupled through again via the connection path. Au-telephone private branch exchange, in which the subscriber must ßerdem if a recoupling of a connection via electronic crosspoints takes place, for example in the case of queries and several coupling levels with connection sets and transferring, a storage of the addresses of the Line transmissions are connected and these 55 original connection participating subscriber crosspoints from a central control device and office transmission are provided. this In the case of incoming connections, the connection means a corresponding memory expenditure, route to the selected, marked subscriber station and through the DT-AS 1266354 a switching

For outgoing connections the connection arrangement is known, in which ^{a light source is switched behind the ansteuzbetween the calling subscriber station and a 6o coupling point in} order to switch through the free connection set or an office transmission through the speech path coupler designed as light-emitting diodes, in which during an existing pelpunkt. With this known connection, temporary couplings remain in order, the speech path crosspoints directly whose connection sets, line transmissions and, depending on the c-core, are carried out as long as subscribers are made and at least 65 switches as the control crosspoint was originally connected to a connection is. With this arrangement, a storage and subscriber station addresses are stored function during the waiting state of those in office and during which an auxiliary wire via entrainment is initially not possible.

The task of the present connection exists then, the additional effort for the subsequent, renewed connection of the pilot wire and for the storage of the addresses of the original Connection involved participant controls and Avoid transfer of office without the system design to change significantly.

This is achieved in that, by separating the holding circle, the speech path v ^ oppelpunkte independently of which the auxiliary wire for storing the subscriber controls originally involved in the connection after initiating a Umkoppluag remains to withdraw the original To enable connection or takeover of a connection.

This avoids galvanic coupling of the pilot wire with the speech wire in a simple manner, and thus the pilot wire can remain switched through during the existing connection. this leads to the fact that on the part of the central control device- »» ment the pilot wire is held even if connections are recoupled, so that in this case then additional storage means for the addresses of the subscriber control units involved in the original connection and line transfers are avoided. »5

An exemplary embodiment is shown on the basis of the drawings of the invention described.

Fig. 1 shows a private branch exchange with a switching network with tricas as bidirectional thyristors existing crosspoints.

Fig. 2 shows a private branch exchange with a Coupling matrix with coupling points consisting of opto-triacs. Called these as opto-triacs, here The components used consist of two triacs controlled by a light-emitting diode (bi-directional Thyristors), with the triacs in the speech wires and the light-emitting diode in the pilot wire.

FIG. 3 shows an overview of the integration of the exemplary embodiments according to FIGS. 1 and 2 in a private branch exchange. FIG. 4 shows the application of the so-called "rate effects" in Fig. 2. In reference to FIG. 1 shown PBX, the subscriber station 71 is via the connecting line VL and the switching stages A, B, C of the switching matrix KF for example with the Connection set Vl connected. The switching network shown consists of triacs as bidirectional thyristors, which have the property of passing both direct current and alternating current. But with every zero crossing of the alternating current, these triacs are switched off. In order to be able to switch these triacs through again after each switch-off, the additional c-wire is coupled to the coupling points via the assigned thyristors. A permanent control circuit should exist via this c- wire at least until the connection is switched through, so that the triacs are activated again after each zero crossing of the alternating current, for example the ringing alternating current.

In the idle state of the subscriber station, the fork changeover contact IGU is in the idle position and there is no loop to the connection set. If the subscriber at subscriber station Π now lifts the receiver, this fork switchover contact IGU is actuated, and the normal loop with the prescribed resistance value exists via the parallel-connected contacts 2nsi and 3nsr, which is recognized in the subscriber circuit in conventional systems and which enables the connection to be established to Connection set is made either by initiating appropriate, directly controlled voters or by initiating identification or after scanning by a scanner with subsequent identification and a marking, the path setting is made.

The system according to the present embodiment is based on a completely different principle. At the central control unit {AT; Fig. 3) the addresses of the subscriber stations are stored for which an incoming or outgoing connection already exists.

On the basis of this, the central controller ATixix cyclically switches through the subscriber stations not yet marked in this occupancy memory to a ready connection set marked as free. This cyclical connection of all subscriber stations with this free and provided connection set takes place until a subscriber station is connected to a connection set in the cycle mentioned which is currently issuing an input assignment for the establishment of an outgoing connection. This is recognized by the loop status evaluator AW _{A of} the connected connection set. This evaluator AW _A is assigned to the /! Side of the connection set. If this subscriber station is then finally connected to the provided connection set, i.e. if this connection set2 is now also centrally marked as occupied, a new connection set is made available as free and in the cycle mentioned successively with the subscriber stations that are not yet centrally stored in a memory (the central controller AT) are marked as occupied. When all the call sets are busy, either a trunk or an auxiliary set is provided and used in a known manner.

In this way, there is no need for a subscriber circuit because, for example, if the subscriber at subscriber station 71 who picked up the receiver and established the loop via contact 1 GU in the above-mentioned manner, in the above-mentioned switching cycle from the central control device via a correspondingly set Path via the switching stages A, B and C of the switching network KF is connected to the connection set Vl and recognized as the caller. Namely, the closed loop of the subscriber station 71 is now determined by the switching means of the evaluator AW _A assigned to the connection set / i-side monitoring the loop status of the subscriber stations and, since a scanning cycle is running for this subscriber station, i.e. a previously existing connection was not available, causes the established connection to be maintained. The dialing character is transmitted on the basis of this status identification.

The triacs of the switching network KF, via which the path is switched through, remain switched through from the c-core when the dialing signal alternating current zero crosses.

The dialing codes now issued by the subscriber station are, by appropriate coordination of the resistance values of the resistor R2 looped in by opening the contacts 2 ms / and 3nsr, with the resistance values of the resistor Rl and the transformer U in the form of current reduction indicators, which are, for example, half

Cause current in the evaluation means of the connection set, transmit. This current reduction leads does not cause the triacs connected in the speech path to be triggered. With the reception of the first impulse becomes in the connection set causes the deactivation of the dialing character in a known manner. The ones from the Election indicators received are evaluated there or centrally and lead in a known manner via the central control

worn out. In this c-wire there is also a switching element, for example the transistor T , which is to be blocked when reporting to prevent voice leakage via the c-wire. From the time of activation until at least the reporting of the called subscriber, this c-core ensures the control of the transistor assigned to the connection set and thus the maintenance of the connection path and control of the

Evaluator AW ₈ in the connection set, which is assigned to the ß-side, the loop status of the connected, desired subscriber station. If the loop is open, the call is activated. If the loop is closed and the subscriber is already busy, the call connection does not occur because the evaluator AW _{B recognizes} the criterion "loop closed". However, it can also be based on the busy indicator

device for setting the 10 triacs to be produced regardless of whether the triacs are interchangeable. If this path is set, the selstromzeichen checks to be switched off briefly or

"'" ° "no. The voice alternating current has on hold and

Falling off the triacs has no effect because this one is superimposed on the triac holding current.

These triacs still have the advantage that they are self-protecting, because only with a higher one Voltage above 400 V, for example, that is more than 6 times the operating voltage, is destructive of these elements possible. But it must assume

tion in the occupancy memory, the ß-through-connection 20 will be gone that anyway each subscriber station do not occur from the outset and receive a busy identifier overvoltage protection. This is the sign connection on the Λ side. location sufficiently fail-safe.

If during the existing connection the. With an incoming connection occurs the

If the earth button is actuated, the desired extension is also here in a known connection path through-connection by marking, since one of the speech wires is short-circuited. In this case, this indicator occurs in the connection set / 4-sided, that is, the control of the extension unit is targeted and the assigned evaluator AW _{A is} recognized. When you hang up the receiver, the current value is zero again
and this is also evaluated by the evaluation means of the connection set and leads to the release of the 30th
occupied crosspoints and other facilities,
especially the connection set.

From the foregoing it can be seen that the subscriber station has 71 full-flow license plates,

with half current and with zero current value transmit 35 alternating current signals from the speech wires with Siwill. This means that a distinction is switched off, blocked, so as to reduce the risk

a galvanic coupling and thus the crosstalk. Must be during an existing one Connected to an AC signal.

so that the monitoring of the pulse 40 is also switched on, the c-wire must be connected to the length unnecessary. calling subscriber position as well as the called

From the above it can also be seen that subscriber stations are coupled through again, which is possible for both the signaling and the call feed without additional effort, because the be and call shutdown, the latter is laid on incoming path, since the speech wires are still through-connected, in the Connection set takes place. This is 45 tet, as well as the participating subscriber stations are possible in that the triacs, as bidirectional themselves, are still known. Thyristors work and, accordingly, the current
let through in both directions. This is true, however
with the restriction that the triacs are switched off at every zero crossing of the alternating current
the. To ensure that the triacs of the
switch through connected speech wires immediately after each zero crossing of the alternating current, the c wire is connected to the speech wire head

Call disconnection takes place depending on the switching means recognizing the loop in the ß-side evaluator AW _{B of} the connection set.

The above-mentioned transistor T, which is in the connection set in the c-wire, is after reporting the called subscriber station or after the completion of the outgoing connection, ie after the time after the

see select and trip indicator zero current value, d. H. a distinction between the dialing numbers the trip indicator does not have to be provided.

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

When the earth key is pressed, the relevant subscriber station 71 is connected, for example, to an exchange transmission via the switching network KF.

This earth key press is in the / 1-sided

to the

Evaluator AW _A found, because in a known manner

associated auxiliary wire crosspoints, 55 the one speech wire, e.g. the i> wires, is de-energized .. ^ K at least until the call is reported. This means that the triacs are also in this wire nen Tämehmerstelle via the transistor become ineffective. To get these triacs back right away sdsoldeten thyristor, intended to be switched on, the c-wire must be datchgeSSDiil "

Is is noca 2 »required that be switched for the control. For this reason, the first sentence to be controlled by the connection], here for example the translation, is an address »·. Kappfäpwasie e & e Ansteaenmg Äeser coupling memory ASp JSr the inclusion of the address * ^A

~ ** afc also assigned to Λ participants

»End connec- The coupling points of the c-core and thus the 1

is. This Ansteueiuug pdpuakteioderbetreffeadea, EeanteB! iyteu.dEach 65 mm can be re-set

Aaste

In a nasty way, g 4 triacs become the Sprecaadem several times

will. After releasing the EM button and

faaiti ^ der ü Spreca ^ der laUli "spring fre ^ egebea werdea. ³

By pressing the earth button, the original connection path becomes the original connection path if the switching does not take place via a switch in the exchange transmission can be triggered by the exchange transmission and a recoupling to an internal connection set be initiated in a known manner from the central control device. The new hiring of the connection path takes place by based on the stored participant address and the stored Transmission address the coupling options of the c-core determined by the route search and thus the corresponding crosspoints of the speech wires are controlled. The original path stays in Connection with the subscriber and trunk transfer address stored in a special memory. In this way, the originally calling Subscriber station or the queried subscriber station with the originally occupied transfer of office and can thus be connected to the waiting outside line.

If the recoupling to the inquiry path takes place in the exchange itself, then during the Query the path to the transfer of office remain.

Both when the A subscriber withdraws the exchange connection and when the exchange connection is transferred depending on the B-subscriber pressing a button, the aforementioned speech artery is interrupted by pressing the earth button and is carried out as described above for initiating the inquiry, the readjustment of the interrupted speech artery by activating the c-artery again and passing through the corresponding crosspoints there. For the renewed setting of the / 4-sided pilot wire, said address memory ASp is provided for receiving the addresses of the A subscribers and the address memory BSp for receiving the address of the ß subscribers is provided for connecting the β-side connecting through of the c core . 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.

In the system described with reference to FIG. 1 Thus, by using the triacs, it is not only possible to switch calls on and off from the connection set take place, which is not possible when using thyristors, because there the call on and off must be can be done individually from the subscriber circuit, but also the complete Subscriber circuit and the existing galvanic isolation for decoupling the direct current can be saved from the thyristor crosspoints.

As already mentioned, this is achieved by that in the system described the participants are cyclically marked as free with a and the connection set made available are connected and checked for the loop status, namely in such a way that this is only for those marked as free in an allocation memory Subscriber stations takes place This allocation memory is aasgefönrt in such a way that either in each case the address for identification this occupancy rate in a certain Follow existing subscriber addresses an occupied number enrolled and when available

is deleted again. This cyclical connection of a connection set provided with still unoccupied participant positions means a simple possibility to use one in parallel successive interconnection test and thus for the functional test of the route finder, the crosspoints and the ways. For this purpose, it makes sense to switch connections through successively between a marked connecting string and the free participant positions after one of the Functional test to carry out adapted scheme in order to consciously control all in this way Check connection options, crosspoints and paths.

If the newly developed opto-triacs are now used instead of the triacs in the circuit described above according to the exemplary embodiment in FIG The advantage is that during the existing connection it is not necessary to separate the c-wire to avoid galvanic coupling, because these light-emitting diodes do not have the property of galvanic coupling. This also means that remains continuously stored on the c-wire of the existing communication path and, unlike the embodiment of FIG. 1 address memory for receiving the A node addresses and the ß-subscriber address in the link sets and office transmissions in which added a Erdtastenkennzeichen and is evaluated, can be omitted (, ASp and BSp).

In this way, if, for example, there is a consultation call and a withdrawal the exchange connection is made by the originally calling subscriber station or a transfer is required on the inquired subscriber station, always the address of the originally calling and / or the relevant transfer of office from the central control device on the basis of the held The pilot wire setting can be determined and the necessary recoupling can thus be carried out will. It remains to be mentioned that when initiating a recoupling of the holding circuit for the Speech path crosspoints has been separated while the c-wire is held. The aforementioned The zentialen is disconnected to enable the speech path coupling relays to be switched on again Control device only when the marking of the c-core for the withdrawal or reassignment of the Connection takes place.

The control of the auxiliary wire coupling points assigned to the speech wire crosspoints (triacs)

SS score (thyristors) and thus also the light-emitting diodes takes place in the embodiment shown in FIG again via the central control device and the path finder. As in the embodiment of FIG. 1, beer is also the cyclical one Connection between a connection set marked as free and a subscriber from one defining a certain sequence of connection and the occupancy status previously checking the central scanning device of the central control unit

Drive through in the direction of AT . The other processes correspond to the processes which have already been described with reference to FIG.
From the top view in Fig. 3 it can be seen that the

The above-mentioned scanning device contains a connection set and exchange transfer marker VM and a subscriber marker TM , the connection set marker always being set to the next free connection set and the subscriber marker successively activating the free subscribers one after the other. As mentioned, this activation is dependent on the subscriber's occupancy identification, which is recorded in the occupancy memory BSp . This occupancy identification takes place, for example, by writing in an occupancy bit to the respective subscriber address. If the central control device is occupied for another process, this scanning process can continue independently of this. The cyclic subscriber scanning process is only to be interrupted when the path is set from the central control device, which the central control device initiates by sending a corresponding command to the scanning device AT .

In FIG. 3, both the control of the internal connection sets HVS and the control of the exchange transfers A VS are indicated in their activity as an auxiliary set when all connection sets are busy.

FIG. 4 shows a different type of connection path through-connection for the exemplary embodiment according to FIG shown without searching for a route according to the so-called »rate effect«.

in an article by International Telephon and Telegraph Corp. in Telephony magazine, December 6,1971 is the utilization of the aforementioned "rate effect" on the basis of various exemplary embodiments for the connection of a speech path via PNPN diodes. From this description it can be seen that there are a number of possible connection paths due to the properties of the named PNPN diodes and the different time switching automatically one way as preferred route results when the start and end point of the connection to be switched through is marked. In the case of the described in the article

10

This arrangement is the so-called single-core speech channel connection.

In the arrangement according to FIG. 4 becomes the marking of the c-core at the starting point and at the end point

made by marking the connection set via the scanner VSK and the marking of a participant via the scanner ATK and this c-wire is switched through according to the so-called "rate effect" when the marking was completed depending on the free identification of the subscriber station. This means that an overvoltage on the c-wire is first detected via a corresponding indication point IK of the subscriber station and the marking circuit for this subscriber station is only carried out in the control AST and the c-wire 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 corresponding PNPN diodes Dl, Dl and D3, the LEDs LDl, LDI, LD3 also control the triacs Tal, TbI and Tal, TbI and also TaZ and Tb3 . After this through-connection, the c-wire remains for the

^a 5 duration of the connection is switched through and the processes run in accordance with the processes described with reference to FIGS. 2 and 1. In this embodiment, too, there is a special / 1 address memory and B address memory for the storage

tion of the corresponding participant addresses and renewed activation of the fc wire when the earth button is pressed unnecessary. The saving of the path searcher and the saving of the occupancy memory for the identification of the respectively occupied subscriber stations cost one in this arrangement according to FIG additional indication point per participant. In return, however, the connection through the connection is faster, which is advantageous in terms of the time required to complete a sampling cycle of the subscriber stations

perform. The connection set is designed in the same way as in the exemplary embodiments according to FIGS. 1 and 2.

For this purpose 4 sheets of drawings

Claims (2)

talking crosspoints between a marked Claims: subscriber station and a marked verb instruction set or a marked line transmission ! .Circuit arrangement for a telephone is switched through and then in this Hüfsadc sweep, in particular FernsprechnebensteUenanlage, 5 effectively switched light-emitting diodes assigned in de Electronic crosspoint switched via electronic speech path at the subscriber stations Control crosspoints of one or more coupling stages. with connection sets and line transmission. In known telephones with electronic be linked gene and see these crosspoints crosspoints the crosspoints are inds the connection path for marking and by means of a route search controlled by a central control device at ankom- ^lo vidually of the central control device from durcl Menden compounds selected labeled subscriber station and the once switched crosspoints s keep <outgoing connections kept the connection path for a long time, as there is a holding current for the individual between the calling subscriber station and some crosspoints. When a free connection set or an exchange * 5 connection is triggered, the holding circuits are switched through, during which one disconnects. If these electronic crosspoints are temporarily thyristors, for example thyristors, call connection and disconnection to other connection sets, line circuitry in the subscriber circuit is necessary, since transmission and subscribers are carried out via the thyristor cores and at least the original DC monitoring an ^ao for the control of the call disconnection is possible. a connection involved line and part- If such electronic building contractor addresses are stored as crosspoints and elements are used that allow the direct current to pass through the appropriate directions, for example double-crosspoints between both of the first one bypass artery a marked partial directional thyristors (triacs), then these have the Einhraerstelle and a marked connection ^a 5 property that when a signal set or a marked line transmission AC current from the controlled Z. State in which it is switched through and then led in this pilot wire rest position. This means that the effectively switched light-emitting diodes assigned in speech path coupling points, electronic coupling of the ringing alternating current switched through the speech path, should be controlled again at each zero crossing, through which they would have to be marked. For this purpose, the well-known coupling points that are not suitable by breaking the hold circuit of the controls. Speech path crosspoints regardless of the Auxiliary wire for storing the subscriber stations originally involved in the order is to avoid the disadvantages of the upstream connection according to the known arrangement of each speech path initiation of a Umkopp'ung remains to 35 crosspoint or each crosspoint pair in such a way a withdrawal of the original connection of an auxiliary wire and with an associated connection or a takeover of a connection coupled to control crosspoint that the in the course of the possible. Connection route marking controlled arrival 2. Circuit arrangement according to claim 1, the control crosspoints automatically the assigned characterized in that the light-emitting diodes and 4 ° crosspoints in the speech path through control and thus switch through the assigned speech path crosspoints from the connection path. With this “opto-triacs” known per se, a luminous order, a galvanic coupling can arise with a bed diode and two light-emitting diodes controllable, double speech connection if the im pelt-directed thyristors (triacs) exist. Speech path switched electronic coupling 45 points are directly connected to the control coupling point. In order to avoid this, the