DE916182C - Circuit arrangement for private branch exchanges for the production of different-valued outgoing exchange connections - Google Patents

Description

Circuit arrangement for private branch exchanges for the production of different values outgoing trunk connections To identify the authorization of a calling party Extension participant is already. has been proposed to connect a potential to an auxiliary wire to create, which is evaluated in the office transferor in such a way. That if present this potential enables the subscriber to establish an exchange connection is, while in the absence of this potential in the exchange an identification of the calling subscriber. But only two can be done in this way Differentiate between authorizations: namely whether the participant has full authority or is only switched with semi-official rights.

To have the opportunity to call a public official Participants also to check whether they are required to conduct a high-quality exchange connection, as it is represented by a long distance connection :, is authorized, are on the other hand Arrangements are known in which the potential applied to an pilot wire is different is trained. For this purpose there are resistors in the subscriber line circuit provided, depending on the authorization of the calling subscriber to the auxiliary vein. are switched on and the strength of the current flowing through the pilot wire change. The respective change in current is indicated in the exchange by corresponding Test equipment is evaluated, and depending on the result of this test, the participant either enables or prohibits the establishment of a high-quality exchange connection. These arrangements, which work with a change in current within the test wire, to determine the authorization of a calling subscriber, have the disadvantage that specially trained test switching means are necessary that quite must meet certain fault current conditions.

The invention takes a different approach to characterizing the different Authorization of calling extension party by suggesting that the Authorization of the extension identifying potential depending on the type of this authorization different lengths of time to the auxiliary line: switched on and through in the office transmitter Time switching means located for making the production effective or ineffective facilities that enable high-quality office connections are evaluated.

According to a further feature of the invention, the choice of the Outside line code the potential for the authorization of the extension all extensions in the same way applied to the pilot wire and occupied by the Trunkers can be influenced by separating means depending on the authorization of the calling party Extension switched off at different time intervals.

The arrangement is made so that when a call is made to a semi-official Extension directly to the potential used to identify the authorization after the assignment of an exchange transmitter is switched off., while with the assignment of the official transferor by one to lead one falling in the local traffic zone Authorized participant in the conversation, the labeling potential is not switched off and with the assignment of the office transferor by one for the management of a high-quality Outside call authorized subscriber to switch off the one used for identification Potential according to an enabling the connection of a free exchange line Period is made. Due to the permanent connection of the labeling potential when the office transfer is occupied by a subscriber who is only authorized for the local authority a blocking device is made effective, the production of a in the long distance network running connection prevents.

An exemplary embodiment of the invention is shown in the drawing.

This exemplary embodiment only shows the current flows that are absolutely necessary for understanding the invention. The assignment of a free exchange line AL by an extension subscriber T? V takes place via an AS-GW connection set after selecting a certain exchange code. The individual extensions are marked in different ways in the d-Kontakthank of the call seeker, depending on their authorization. In the exemplary embodiment, it is assumed that an extension subscriber authorized to reverberation is connected to contact i, a. Authorized subscribers to conduct a call leading to the local traffic zone are connected to contact 3 and a subscriber who is authorized to conduct high-quality exchange connections is connected to contact 5 of the d-contact bank. In the idle state, a contact t.4 of the isolating relay T, which comes into effect when the caller encounters the calling subscriber, is connected to negative potential via a resistor. In this feed line there is also a winding of the call relay R, which therefore comes into effect again when the d-wire is switched through after the exchange code has been recorded and can be used to switch on any display means. The working page of the contact tq. is routed to minus for the extension units authorized to conduct high-quality external calls via a contact tr of the isolating relay TR, while for the subscribers authorized to conduct high-quality external calls. to this work page of the contact tq. Negative potential is applied via a contact ts of the isolating relay TS. In the case of the subscribers who are only authorized to make a local call, the idle side of the contact is t q. bridged by a connection running from terminal i to terminal 2, so that even when this contact is triggered t q. the negative potential remains connected to the d-wire.

A blocking device SP is located in the office transmitter. This will made effective by a contact.-6 of the relay Z and is made in a known manner by the number bursts transmitted over the trunk line to set the Voters of the offices that can be reached in the course of the long-distance connection are also set. In the This blocking device comes up with a call number identifying a remote connection SP takes effect and disconnects the attempted exchange connection, while at the same time the calling subscriber or the exchange can be given a signal.

In detail, the following switching processes take place during the establishment of an exchange connection by the various authorized subscribers: When the subscriber TN lifts the handset, the call relay R is activated via the contacts t i and t 2 and the subscriber loop. This leaves the call searcher AS in a known manner, not shown, and identifies the calling subscriber via his contact r 3 in the test wire c. If the call seeker encounters the contact marked in this way, he is shut down in a known manner, and via the c-wire comes in: the subscriber (connection circuit the isolating relay T to respond. This switches the call relay R from the speech wires and keeps up the contact t 3 in the test circuit. At the same time, the contact tq. is transferred, which applies the identification potential to the call seeker's d-contact bank via an isolating contact tr or ts for the subscribers with semi-office authorization and those authorized to conduct a high-quality exchange connection.

The calling subscriber now dials the exchange code and thereby sets his group selector to a free exchange transmitter. After this setting of the group selector, the relay TI is activated via the c-wire. With its contact v 12, this relay causes relay Z to respond, since negative potential is connected to the d wire in the subscriber connection circuit for all participants who are half, bamts- and voll.amtsrechte. If the subscriber is authorized to conduct a high-quality exchange call, the contact z2 switches on the relay TH, which is connected to the contact vh q. connects through the busy trunk. Contact vh 2 switches on relay BR which, with contact brq, holds relay TH independently of contact z2. For the duration of the response time of the relay BR I, the relay TS is now made to respond via the contact br 2, which switches off the negative potential on the d wire with its contact ts, so that the relay Z in the occupied office transmitter falls again . The blocking device SP initially occupied by contact z6 is thus released again; this release takes place before the call number that characterizes a high-quality external call is recorded. When the relay TS drops out, which is triggered by the contact brIq. was effected, the contract ts the d-wire back to voltage, then a renewed response of this relay Z is prevented by the fact that this relay via the contacts z q. and br5 is shorted. The current impulses now sent by the participant for setting the voters of the occupied office can be passed through unhindered, since the setting of the associated follow-up drive is prevented with contact z6.

Is it a participant who is only responsible for leading an in the local traffic zone is entitled to a call, this can be done with the occupancy of the office transmitter via contact vI2 did not respond to relay Z be switched off, because in the associated subscriber connection connected to contact 3 the d-bank of the call seeker is switched on, no switching off of the negative potential he follows. The contact z 6 of this relay accordingly switches the locking device SP so that the follow-up drive is set with the following choice and when passing on a number identifying a high-quality external call can break the connection in a known manner.

The independent assignment of a free exchange line by only one half-time authorized participant is prevented from being directly with the Assignment of the office transferor via contact v I 5 and the one not yet activated Contact brq, the relay TR is triggered, that with contact tr das Negative potential of the d-wire even before an effective excitation of the switched through Relay VH takes away. In a known manner, the assigned connection set can then be released initiated and the switching center notified.

Claims (7)

PATENT CLAIM IE: i. Circuit arrangement for private branch exchanges for the production of different-valued outgoing exchange connections by extension, the authorization of which to conduct outgoing exchange calls according to the choice of the exchange code is determined by a potential lying on an auxiliary wire, characterized in that the potential characterizing the authorization of the extension differs depending on the type of authorization for a long time, the pilot wire is switched on and by time switching means (TH, BR) located in the exchange transmitter to activate or deactivate the facilities that enable high-quality exchange connections. (SP) is evaluated. 2. Circuit arrangement according to claim i, characterized marked that after dialing the outside line code, the authorization of the extension characteristic potential for all branches in the same way to the pilot wire created and through. from the occupied office transferring agent because of the usable separating means (TR, TS) depending on the authorization of the calling extension at different time intervals is switched off. 3. Circuit arrangement according to claim i and 2, characterized in that that through the authorization potential connected to the auxiliary wire in the office transmitter one, relay (Z) is made to respond "one of the production of higher quality Makes trunk connection preventing device (SP) effective. q .. Circuit arrangement according to Claims i to. 3, characterized in that when the exchange transmitter is occupied by an extension authorized to produce high-quality exchange connections by switching means (VH, BR) which are brought into effect and delay working by the relay (Z) on the auxiliary wire, the authorization potential in the subscriber line circuit is activated before it becomes effective the locking device (SP) is switched off again. 5. Circuit arrangement according to claims i to q., characterized in that in the office transferor to the Relay connected to the pilot wire (Z) after it has dropped out to identify the authorization of the calling extension on answering again in the event of a renewed creation of the authorization potential prevented by switching means (BR) activated when it was first turned on is. 6. Circuit arrangement according to claim i to 5, characterized in that by the response of the relay (Z) connected to the pilot wire, the switching through of the Switching means (VH) carrying out the trunk line can be brought into effect with a delay ;: 7. Circuit arrangement according to claim i to 6, characterized in that the Allocation of the office transferor by a semi-authorized extension the identification potential even before speaking. the person who connects the exchange line Switching means (VH) is switched off. B. Circuit arrangement according to claim i to 7, characterized in that that the connection of the potential serving as authorization identifier of the pilot wire can be made by two isolating switching means (TR, TS), which : all, extensions are assigned jointly and according to the occupancy of a free one Office delegates come into effect one after the other. G. Circuit arrangement according to claim i to 8, characterized in that after the assignment of a free office transmitter immediately responding isolating switch (TR) that serves as an authorization identifier un = d potential connected to an auxiliary wire for all half-office authorized extensions even before the activation of the exchange line in the exchange transmitter performing switching means (VH) switches off again. ok Circuit arrangement makes a claim i to g, characterized in that that after the assignment of a free office transmitter respond with a time delay = de isolating switch (TS) as the authorization identifier serving and connected to an auxiliary wire potential for: all for the guidance of higher quality Outside connections authorized extensions after switching through the outside line and before the institution blocking the management of high-quality official connections takes effect (SP) interrupts. i i. Circuit arrangement according to Claims i to io, characterized in that that all extensions authorized to conduct low-level external calls the disconnection or interruption of the authorization potential in the subscriber connection circuit is omitted.