DE1102821B - Circuit arrangement in telephone private branch exchanges with subscriber stations with different exchange authorization - Google Patents

Description

Circuit arrangement in telephone private branch exchanges with subscriber stations different office authorization is known in telephone private branch exchanges the fee for the establishment of local exchange connections is thereby taken into account, that to the counter of the calling station a counting current surge after termination of the local exchange connection is transmitted. In contrast to this, with high-quality trunk connections (self-dialing long-distance traffic) the counting immediately after the connection is established and the called party is reported a.

It is known to use this difference in counting as a hallmark to use for the value of the established office connections, in particular in private branch exchanges with subscriber stations with different exchange authorizations, to trigger the first counting current impulse that takes effect after the start of the call to bring about the established exchange connection when the calling station to establish higher-quality external connections is not authorized.

The present invention relates to one in this direction lying special case. It is intended to prevent those who are not entitled to telecommunications Extension participants through high-quality exchange connections in the takeover process Unrestrictedly authorized participant positions can be allocated. In contrast In addition to the known arrangements, it is required to prevent unauthorized official traffic no special isolating and dropping relays, counter windings of holding relays and the like, but it solves the task in a simple and always safe manner by that of an extension that is not authorized to establish high-quality exchange connections assigned meter is equipped with a contact, which the first time after the switching process to take over a high quality manufactured by an unrestricted authorized body Office connection path transmitted metering current impulse causes the connection to be released.

The drawing shows an exemplary embodiment in a simplified representation of the subject matter of the invention illustrated.

Fig. 1 shows schematically in private branch exchanges for official traffic and the reassignment of office connections as usual connection routes, while Fig. 2 is directed to the implementation of the inventive concept details contains.

If, as shown in FIG. 1, an exchange connection is established from the extension N 1, the exchange code is dialed by the call seeker AS 1 after lifting the handset and providing a group selector KW 1. The exchange transmission AU with the exchange line AL is switched on via the contact y, which remains idle. The subscriber can set up the connection path to the desired exchange subscriber by dialing another number. Whether he succeeds in this depends on the value of the chosen connection and on his authorization. It is known that in private branch exchanges only a limited group of subscribers is assigned the right to automatically establish exchange connections. Among these authorized subscribers, in turn, only a small group is authorized to automatically establish connections that are higher than the local exchange rating (self-dialing long-distance connections). The monitoring of the outgoing exchange traffic is incumbent in a known manner on a lock follower, which is usually assigned to the exchange transmission. The locking tracking drive checks, depending on the numbering and the processes that characterize the calling subscriber's authorization, whether the exchange connection can be established or not. In the case of connections established by subscribers with unrestricted exchange authorization, the monitoring function of the locking device drive is switched off from the start.

It is assumed that an automatic dial-up remote connection has been established by the extension N1 with unrestricted office authorization according to FIG. 1. Immediately after the desired subscriber has reported, the first counting pulse is transmitted to the counter of the calling station N 1. During the connection, the counting current impulse transmissions are repeated at intervals determined by the value of the connection. The extension N 1 can hold inquiry to the extension N2 in a known manner. By pressing the button at point N1, the relay (F) is switched on, which holds the exchange line and switches on an internal connection set via the working side of contact y. The call seeker AS 2 brings the group selector GW 2 in connection with the extension N 1. By sending three series of impulses and setting the group selector GW 2 and the line selector LW , the extension N2 is switched on and called. After the inquiry, the extension N1 can switch on the exchange line again by pressing the button again. The extension N 2 can also take over the outside call. By pressing a button at this point, a relay U is energized, which, by releasing the previously used internal route AS 1-GW 1, switches on the exchange transmission and thus the exchange line. Subscriber N2 can now speak to the exchange line subscriber. The metering current impulses transmitted from the takeover are transmitted to the meter of the extension N2.

A takeover of trunk connections may only be possible if also the accepting subscriber to establish high-quality exchange connections (self-dialing long-distance traffic) is justified. Otherwise an unauthorized person could in an unauthorized manner Participants high-quality office connections in the takeover procedure from an authorized one Participants are assigned, it should be noted that also partially built Official connections taken over by the unauthorized person and completed by himself can be (partly so far that the control function of the locking follower is off).

The subscriber station N shown in FIG. 2 of the drawing should only be authorized for local authorities. Local exchange connections can be established automatically from this point, but higher-quality office connections can only be made with the assistance of an officer (attempts to establish higher-quality office connections yourself fail because of the blocking mechanism). After lifting the handset at this point, the call relay R is energized via contacts t1 and t2, which closes the incentive circuit for the call seeker AS in a known manner. After the calling subscriber has been found, the test and blocking circuit is established via the working side of contact r and switching arm c of the call seeker. Relay T responds, relay R remains on hold. The call circuit is opened by the contacts t 1 and t 2. After the exchange code has been sent, the exchange transmission AÜ with the exchange line AL is switched on via the switching arms a, b, c of the group selector GW 1. The locking mechanism, not shown, monitors the numbering. Only if higher-quality exchange connections and unauthorized local exchange connections (time announcement, messages, etc.) are selected, further connection establishment is prevented. Higher-quality office connections can only be established with the assistance of an officer, in which cases the locking mechanism is disabled. The counting current impulses transmitted during such connections are picked up by a counting relay (not shown) of the office transmission and forwarded to subscriber station V via the connection path via contact. The current impulses suitable for counting transmission are generated by a transistor generator TG . The pulses given simultaneously over the voice line run over a subscriber switch TW and are passed by this to the counter Z of the subscriber station N after they have been converted by the transistor amplifier TV - into pulses ensuring a reliable response of the counter.

All subscriber units only authorized for local authorities have a with a Associated with the contact of the equipped meter. This contact z is a normally closed contact in the test wire arriving from the line selector c. Used by an unrestrictedly authorized Establish a high-quality exchange connection in whole or in part and then recreate it An unauthorized participant can set up an inquiry path, so can the only local authority authorized subscriber will receive the connection, but will at the first counting pulse after the takeover test wire c opened through contact z, which results in the immediate release of the trunk connection.

Claims (2)

PATENT CLAIMS: 1. Circuit arrangement in telephone private branch exchanges with subscriber stations with different exchange authorizations for which the process the metering current impulse transmission immediately after establishing the exchange connection for identification a high-quality exchange connection (self-dialing long-distance traffic) is used, thereby characterized in that the one for the establishment of high-quality trunk connections is not authorized The counter (Z) assigned to the extension is equipped with a contact (z) that is activated by the first after the switching process to take over an unrestricted authorized person Place established high-quality exchange connection path of the transmitted metering current surge initiates the release of the connection. 2. Circuit arrangement according to claim 1. characterized in that the counter contact is used as a break contact in the line selector incoming occupancy wire of the subscriber circuit is and by separating this Wire at the first transmitted metering current impulse after taking over the trunk connection path is triggered.