DE863217C - Circuit arrangement for telecommunications systems, in particular telephone branch exchanges, with several classes of subscribers with different traffic authorization - Google Patents

Description

Circuit arrangement for telecommunication systems, in particular telephone extension systems, with several classes of participants of different traffic authorization The invention relates to a circuit arrangement for telecommunications systems, in particular telephone branch exchange systems, with several classes of participants of different traffic authorization.

In the case of private branch exchanges, a distinction is usually made between officially authorized and unauthorized microphone units. To establish trunk connections There are already numerous orders to prevent unauthorized participants became known, with which the differentiation of the different traffic authorization mostly through different training of the connecting lines or preselection organs is effected, whereby the connecting device in which the directional elimination takes place, is influenced differently. In cases where more than two classes of participants with different traffic authorizations are available, it is known to provide facilities at several points in the course of establishing the connection, by means of whose tests are carried out on the class of the calling subscriber and the production unauthorized connections are prevented.

The invention relates to and sees arrangements of the latter type proposes a solution that is particularly suitable for such private branch exchanges those of extension subscribers from outside of the house, including local, district and Remote connections are established automatically and thus both four Classes. of participants, microphone units only for house traffic, Call stations for house and local traffic, call stations for house, local and district traffic and call stations for house! s: -, local, district and long-distance traffic, to, - differentiate are. According to the invention, the authorization checks are carried out in such a way that Depending on the traffic authorization of the participants, the preselection organs differ are formed and thereby in the connecting device in which a directional selection is hit, 'switching means (Z, I, II) come into effect differently, that . when choosing an unauthorized direction on the part of: an unauthorized participant in a manner known per se, the establishment of a connection is prevented and if this direction is selected by authorized participants of the type of authorization Dependent switching indicators: then transmitted to the downstream connection device in which a further direction number takes place and in which the transmitted Authorization switch indicators are saved.

The invention is illustrated below with reference to the in the drawing Embodiment explained. 'The circuit- shows one from left to right Connection line of a private branch exchange with VW selection, one downstream of the VW Group selector G W, in which the first check for trunk authorization takes place, and finally a transmitter Ue with follow-up drive Dm, in which the second authorization check takes place and who has access to the office. All the connecting devices mentioned are located in the private branch exchange.

Different potentials at the d-arm over selector as a function of the traffic authority created, in the following manner: For stations; which are only authorized for house traffic: earth is applied via terminals i, 2.

For call stations that are approved for local traffic, there is no Potential applied.

In the case of microphone units that are approved for local and regional traffic, is switched on via the terminals i, 3 negative potential via the high resistance Wi i.

In the case of intercom stations that are allowed to establish long-distance connections in addition to local and district connections, negative potentials are connected to terminals i, 4 via the low-ohmic resistor Wi 2 on the d-arm. .

The mode of operation is as follows: i. Call station is only authorized to "- establish house connections. When the handset is picked up, the preselector is left on in a known manner, which checks for a free group selector via the c-wire. Relays A and C are activated one after the other in the GW Subscriber the first digit of the desired house connection, the lifting magnet H is raised to the corresponding decade by the pulse relay A. After the delay relay V, which is excited during the pulse series, has dropped out, relay I is excited via head contact k II, which, in interaction with the rotary magnet D, turns the GW causes. When checking a subordinate voter, relay P responds, which prevents the further switching of the voter and connects the speech wires. These processes are quite normal: The same applies to the release of the house connection, which is initiated by hanging up the receiver on the caller ..

If the subscriber selects an o after the GW has been assigned, which is intended to identify trunk connections, the decade contact ko is closed, so that the following circuit is established via the d-wire of the VW: -h, 2-i, d-arm, ko (in GW), Z, -. Relay Z responds and holds itself via contact sk, the. when the selector is turned in, it closes, and via contact z I further when contact ko opens again. The outgoing test circuit is separated by contact z II, so that the dialer goes crazy and the subscriber receives a busy signal in a manner not shown If, after the VW of the calling station, the number o is selected to establish a local connection, the GW turns in the usual way after reaching the tenth decade and searches for a free transmission Ue. A response of the relay Z is in this case prevents there is no potential on the d-arm of the VW, as mentioned above. In the test circuit of the checking selector, A i responds in the Ue relay, which is connected via -, A i (i, 2), Wi 6, x 11I, ci .V, A i (3, 4), + holds. Contact ai I opens the short circuit for relay C i, so that it also responds and with contact ci II switches on the delayed relay X. Through contact te x i I and x i II, the station is switched through to relay A i, so that .this is maintained over the loop when the holding circuit is separated by contact x III. Contact ai II forms a loop via throttle relay Dr to the office and thus occupies the connection device located there.

If the subscriber now selects the next digit (i-9) to establish the desired local connection, the impulses are passed on to the office through contact ai II. During the series of pulses, the delay relay hr responds in the usual way, and its contacts short-circuit the throttle relay Dr. The pulses are simultaneously transmitted to the follower mechanism Dm by means of contact ai III and its arms dnaI to cifn III are advanced accordingly. If relay hi drops out after the end of the pulse series, relay O responds in the following circuit to +, ci IV, v i II, switching arm dm I. O (i, -2), -. Contact o I prevents the follow-up mechanism from being influenced by the next series of current impulses. Contact o 1I disconnects the circuit of the thermal relay Th, which is switched on by contact ci IV. This relay releases the connection backwards when responding, if the subscriber hesitates too long after occupancy, the transmission (depending on the choice initiated by the calling subscriber. The processes are normal and are of no significance for the invention.

If the subscriber selects an o after the transmission Ue has been assigned, the follow-up mechanism comes to the tenth contact without causing a special switching process in the transmission. If the participant then selects z. B. the number 4, the relay B speaks to the switching arm dna I. But this does not have any particular effect either. Both the digits o and 4 as well as the next digit are passed on to the office and also recorded by the tracking device. The latter gets through .the third digit on a wire behind contact 14 contacts, which are all wired together. Therefore, it talks about + ci IV, z, i Il-, shifting dyn II, Ab i - relay from i to which separates with its contacts from i I i II and from the outgoing speech wires and thus -a w: rther Transmission of series of current impulses prevented. The connection devices set in the office therefore trigger. The calling subscriber receives a busy signal. The establishment of an unauthorized higher-quality connection, district or long-distance connection, is thus prevented.

If the subscriber selects a number other than 4 after the second o, relay Ab i responds immediately and, as described above, prevents the further transmission of series of current impulses.

3. Intercom is authorized. Establish house, local and district connections. If the participant chooses an o after receipt of the GW, then when the voter turns in, speaks about -, Wi i (in VW), 3-i, d-arm, sh, s I, to I. , I, II, from I, p VI, + only relay I on, which applies negative potential to the speech wires a, b for LT transmission via Wi 5, Wi .4, i III, i 1I or i I. In the latter, relay I 'responds, while relay II' has fault current. Relay I 'is held by resistor Wi g and another winding 5, 6. The response of relay I' takes place before relay X switches through the speech wires of the transmission. The latter is delayed on response. The connection of the switching indicator by relay I in the GW is canceled if, after relay P has responded via contact p VI, relay Ab responds, which interrupts the circuit for relay I with contact ab I.

If the subscriber selects an o again for the purpose of establishing a district connection, the follow-up drive is set to the tenth contact. Since relay I 'is energized in this case, i.e. via dm I and i' V relay F, which continues via contact f 1, in the example shown, the district number 43 is assumed for district connections. The subscriber thus dials the digits 4 and 3 one after the other, whereby the follow-up device first reaches contact 14 and then contact 17. In position 14 relay B responds, which is held when switching to position 17 via contacts v i II, b II and in position 17 via contact b II. In position 17, the switch arm dm II is used to speak to relay Ab i, which, with contact from i III, prevents further influencing of the follow-up mechanism. In spite of the opening of the contacts from i I and from i II, the other series of current impulses to establish the district connection are transmitted, since the speech core remains connected via b I, 1'11, f III one, e, its and i 'III on the other hand. The further processes have no influence on the transfer and are of no interest to the invention.

If a subscriber who is only approved for district connections tries to establish a long-distance connection, the following processes take place in the transmission. After selecting the next o, relay F responds as described above. Selects now the participants a number other than 4, which is the first digit of the district connections, relay From i talks about d na II and opens the contacts from i I and from i II. Since not excited in this case relay B , the a-wire remains open, so that the loop to the office is opened. The calling subscriber receives a busy signal.

4. Intercom is authorized to house. Establish local, district and long-distance connections By dialing the first digit o, when the GU 'is screwed in, relays I and II are excited via the d wires, because in this case the resistance Wi -? is low resistance. Since relay II short-circuits the resistor Wi 4, in contrast to the case described under 3, an increased negative potential is applied to the speech wires for transmission, so that in the latter the relays I 'and II' respond and remain local. The transmission is thus prepared differently than in case 3, in which only relay I 'is activated.

When the second digit o is dialed, relay F responds again. Of the participants can now dial any digits, i.e. establish any remote connection without that the transmission of the series of current impulses is prevented from taking office. Because even after relay Alb i has responded, its contacts remain in the voice lines bridged by contacts 2 'II and f III on the one hand and contact 2' III on the other hand.

Claims (3)

' PATENT CLAIMS:. i. Circuit arrangement for telecommunication a direction selection is made, switching means (Z, I, II) come into effect differently so that if an unauthorized direction is selected by an unauthorized subscriber, the establishment of a connection is prevented in a manner known per se, and when this direction is selected by authorized subscribers Switching indicators that depend on the type of authorization are transmitted to the downstream connection device (Ue) in which a further direction selection is made and in which the transmitted. Authorization switch indicators are saved. 2. Circuit arrangement according to claim i for branch exchanges in connection with automatic Local and long-distance traffic, characterized in that in .the first connecting device (GW) for direction elimination, the participants only authorized for house traffic the establishment of external connections are prevented and in the second connection device (Ue) for direction selection it is checked whether the caller only has local authority authorization, only authorized for local authority and for district traffic or without restriction (also for long-distance traffic). 3. Circuit arrangement according to claim i and 2, characterized in that in the second connection device for directional separation switching means (I ', 1I', O, F, B, Ab ') are provided, which evaluate the switching indicators automatically transmitted and the construction of an unauthorized one Prevent connection. Cited publications: German patent specifications No. 423 812, 543 948, 616 977, 682 628.