DE1086291B - Circuit arrangement for telephone private branch exchanges with a subscriber base which is subdivided in terms of office authorization - Google Patents

Description

GERMAN

In private telephone exchange systems with extension subscribers with different authorization with regard to public traffic Locking followers are used, which give the number current rush for trunk connections monitor and if you choose above a certain value (local authority value) Lying or not allowed outside connections (time announcement, weather reports, etc.) the further establishment prevent the connection and its creation.

However, official traffic should now be unrestricted, i.e. unhindered, for a small group of participants through the locking follower mechanism, are available. For this purpose it is necessary to have an identifier for the to transfer the subscriber's unrestricted authorization to the point to which the blocking drive is assigned is to turn off its monitoring function. The implementation of this switching measure - it is also called activation - causes certain difficulties that known Solutions could be overcome by the fact that the voters taking up the office code with special Cores and switching arms were equipped.

However, arrangements are also known in which the activation control required processes can be controlled via the existing wires. One of these arrangements sees a rectifier parallel to the number disc contact. By a short-term falling in an impulse If the polarity of the speech wires is reversed, the authorization check is carried out. This solution has the Disadvantage that the calling subscriber is annoyed by cracking noises with the receiver at the ear. One Another solution assigns two glow tubes to each authorized subscriber station in the connection line, via which the authorization circuit is closed after the trunk transmission has been switched on. Except This solution closes the relatively large expenditure on switching means in the transfer of offices because of the glow tubes lying permanently on the speech veins, there is a risk that when the impulse is given Distortions occur.

The arrangement used for transmitting the authorization identifier according to the present invention is characterized by its particular simplicity. In particular, it avoids any special equipment and change of the voters lying between the participant's place and the transfer of office, yes even a special effort in relays and the like in these selectors, which is achieved by the fact that the connection line each subscriber station that is entitled to unrestricted official traffic, a license plate transmission relay is assigned, which is attached after the outside line code has been sent and via the circuit arrangement

for telephone exchange systems

with one regarding the authority to act

subdivided participation

Applicant:

German Telephony Works

and Kabelindustrie Aktiengesellschaft,

Berlin SO 36, Zeughofstr. 4-11

Willy Seidel, Berlin-Reinickendorf,
has been named as the inventor

Subscriber loop is held, whereby a wire is through-connected to the transfer of office Speech line identification potential is switched on, the activation in the exchange transmission one that initiates the shutdown of the organ that monitors official traffic (blocking follow-up mechanism) Switching means brings about.

In the drawing, all switching devices that are not necessarily used for its explanation are omitted and current flows of the subject matter of the invention shown in one embodiment.

The connection part assigned only to subscribers with unrestricted exchange authorization is designated by AT. It lies between the subscriber unit and the preselection organ VW assigned to it. Depending on the authorization of the participant, terminals ζ 1 to ζ 3 in the preselector are bridged or left unconnected. Subordinate to the preselector is a group selector GW ₁ via which the exchange transmission AU is switched on after the exchange code has been dialed.

In the case of subscribers in the house who are not allowed to make any external connections at all, terminals ζ 2 and ζ 3 are connected in the preselector. Lifts in

009 569/103

House subscribers drop the handset in order to establish a connection, it will be over

-, Wi2, 5t, N, 6t, R, +

the relay R energizes, which starts the preselector VW in a known manner. If this finds a free group selector, the test circuit is closed via the c-arm of the preselector:

The relay T of the preselector ensures that the group selector is blocked by short-circuiting the high-resistance winding II via contact 8 1. The speech wires are switched through with the contacts 4 1 and 7 t , so that the relay A of the group selector responds:

-, A (I), Up, a (VW), At, N, 7t, b (VW) 12p, A (II), +.

The relay A picks up the number current impulses sent by the subscriber and conducts them in a known but not shown manner on the lifting magnet of the group selector, whereupon a subsequent free connection device is occupied in the set decade. It then speaks to the relay / ³ via switching arm c of the group selector, which by closing the contacts 10 p and IZp switches through the voice wires to the subsequent connection device.

If the subscriber dials the outside line code, for example the number "0", the relay .9 of the group selector is switched on to the switching arm d of the preselector at the head contact k 10. Relay S is switched on via contact 9 1 and terminals s 2 and s3 , which switches off the rotary magnet of the group selector in a known manner so that the group selector cannot turn in. At the same time, relay S causes a busy signal to be transmitted to the calling subscriber.

For participants who are simply authorized to act, ie can establish local exchange connections, the positive potential on switching arm d of the preselector is missing due to the fact that terminals ζ 2 and ζ 3 are not bridged. The connection terminal a1 is also not connected. If such a subscriber dials the exchange code, the relay "S" of the group selector cannot respond. After the group selector has been set to the exchange transmission, the circuit comes up

-I-, P, c (GW), Cl, -

conditions. As already mentioned, the speech wires in the group selector are switched through by relay P , while relay C 1 closes its contact 17 c 1 and thus a circuit for relay X in the exchange transmission. This switches through the speech wires in the exchange with the contacts 14 χ and 16 .λγ. The relay F in the exchange transmission cannot respond when an exchange connection is established by subscribers with local authority authorization. As a result, the locking follow-up mechanism located in the exchange transmission is kept switched on, so that the ranks of the current impulses sent by the subscriber according to the exchange code are monitored. When dialing higher-quality exchange connections or when dialing unauthorized local exchange connections (time announcement, • weather reports), the blocking tracking mechanism prevents the further establishment of the connections, possibly with the transmission of a busy signal. The connection line of subscribers with unlimited authority is special by the addition of AT

educated. In the preselection of these participants, terminals ζ 1 and ζ 2 are bridged. If such a subscriber has dialed the outside line code, the following circuit is established after closing the head contact k 10 in the group selector:

-, S, klO, d (VW), 9t, z2-zl, F (III), Zy, +.

In this circuit, the relay F responds, which (via contact 33;) connects a high-ohmic resistor (WiI) in series. The purpose of this is to prevent the relay 6 * in the group selector from responding or, if it should pick up, it is thrown off immediately. The relay F, which is only switched on for a short time in the above-mentioned circuit, since the head contact k 10 is opened when the group selector is turned for the first time, is placed in a holding circuit via its windings I and II, the contacts _{Iy 1} 2 y and the subscriber loop . The purpose of energizing the relay F is to apply negative potential to the upper voice wire, which creates the following circuit after the group selector has checked the trunk transmission and the relay P in the group selector has responded:

-, F (I), Iy, upper speech artery, At, a (VW), 10p, a (GW), 15x, F (I) ^J r.

This circuit exists only for a short time and only for the duration of the response time of the relays Cl and X in the exchange transmission. After the relay X , which is switched on by relay Cl , has responded, the above circuit is interrupted by contact 15 χ and connected to contacts 14 .a; and 16 χ the voice line switched through in the exchange transmission. Relay F (IT) is maintained via contact 18 / and together with relay X via contact 17el for the duration of the connection. In order to ensure the reliable response of the relay F , both relay C 1 and relay X are designed as switch-on delayed relays. By relay F , which is not shown here, the locking follower is switched off. The subscriber can therefore establish any desired exchange connection without being restricted by the Sperrmitlaufwerk. (Of course, the arrangement could also be made in such a way that the locking follow-up mechanism is not switched off but switched over by the relay F , so that very specific exchange connections are prevented.) who over the partial

Receiving station running holding circuit for relay F interrupted. It remains idle while the connection is being established and during the call, so that the speech artery is switched through to the office without resistance and capacity.

Claims (5)

PATENT CLAIMΕΙ. Circuit arrangement for telephone extension systems with a subscriber base that is subdivided with regard to the exchange authorization, characterized in that the connection line of each subscriber station, which is entitled to unrestricted official traffic, is assigned an identification transmission relay (F) which is activated after the exchange code has been sent and via the part receiver loop is held, whereby identification potential is switched on to a wire of the voice line connected through to the exchange (AU) , which in the exchange transmission the activation of the switching off or switching of the monitoring of the exchange Organ (locking follower) causing switching means (F) brings about. 2. A circuit arrangement according to claim 1, characterized in that the influencing of the switching means (release relay F) which takes place via a voice wire and which disconnects the locking follower mechanism is terminated when the voice line is switched through in the exchange transmission. 3. Circuit arrangement according to claim 2, characterized in that the process from the occupancy of the office transmission (response of the relay P in the group selector) to its through-connection (via the slowly responding relays Cl and X) is delayed. 4. Circuit arrangement according to claim 2, characterized in that the activation relay (F) triggered via a voice wire is placed in a local holding circuit for the duration of the connection. 5. Circuit arrangement according to claim 1, characterized in that the license plate transmission relay (Y) held on the loop of the subscriber with unlimited authority is switched off for the duration of the connection from the subscriber line for the duration of the connection at the beginning of the first current surge of the series of surge currents following the exchange code. Considered publications:
German Patent No. 937 420;
German interpretative document No. 1 019 709. 1 sheet of drawings © 009 569/103 7.60