DE1099003B - Circuit arrangement for telephone extension systems with intercom stations with different traffic authorization - Google Patents

Description

Circuit arrangement for telephone extension systems with call stations different traffic authorizations it is becoming more and more necessary to provide facilities in private branch exchanges that block the self-establishment of a long-distance connection for certain extensions.

Various facilities of this type are already known. For example w3 the difference in billing of local and long distance connection for disconnection unauthorized holiday connections are used. In the case of local connections, the Transmission of the counting pulses at the end of the call, in the case of long-distance connections a counting pulse is already sent at the start of the call. this difference will be used to trigger an unauthorized connection. Furthermore, have been for a long time Lock follow-up drives known, which are actuated when the impulses are sent to the office. They are either permanently assigned to the exchange line or become 1 an outgoing exchange call to the trunk line: switched on.

These lock tracking drives are mostly self-contained devices that are optional Ordered by the subscriber and linked to the exchange line by some type of connection will.

The use of -lirmit drives has compared to the evaluation mentioned first the billing has the advantage that a certain number of dialing impulses Can unlock and thus not only unauthorized 7-core connections, but also certain location information, for example time announcement, tote announcement and similar special ones Services, as well as the currently existing local transport, which also has the Count only at the end of the call (multiple counting is taken, will be blocked can. However, all of the locking means described up to now have a significant impact on the night additional switching means required 3 that furthermore in the case of using the Counting @ as a test criterion, the disconnection only after the connection has been established takes place and that lines and all office facilities are unnecessary. aside from that there is a charge unit for each separate connection, the talk time of which is not used will.

The invention relates to private branch exchanges with speeches different traffic authorizations, all of which are connected to the transfer of offices at the same time are, remotely with the exchange line permanently assigned inquiry w, around pulse monitoring device, which monitors the connection that has been established and, if applicable, the disconnection of the connection to the office is characterized by a switching means, a) that after transmission allowed series of impulses to the exchange, which are monitored with the inquiry dialer, are effective wirlie established connection as allowed, the consultation dialer of his Activates the task as a blocking follower selector and controls the starting position, b) which takes effect when an outside call is received, and the transfer of a External calls made possible with the help of the inquiry dialer, c) depending on the latter after sending the inquiry criterion and after switching the inquiry switch A busy signal is sent to the extension via part of the inquiry path, and by a relay that does not have the latter switching state when it is sent allowed series of impulses to the office and at the same time the consultation dialer steers into the exit point.

The circuit diagram shows an embodiment in which the other Details of the inventive proposal are shown. It is about a Private branch exchange, in which, for the sake of simplicity, it is assumed that the official criterion is given by pressing the earth key at the extension. The invention however, does not only apply to such systems.

The functional description of the circuit is in the following according to the different possibilities.

A. Outgoing exchange If an extension, for example Ext1, wants to set up an exchange call, then after picking up the handset, first press the earth button. In the subscriber circuit of this extension, the combination on the b-wire, consisting of the winding (2, 1) of the relay R 1 and the winding (4, 3) of the relay T 1, is bridged. As a result of the differential switching of the relay T1, T1 is only now activated; Relay R 1, on the other hand, drops out. After releasing the earth button, the relay R responds in the exchange line, namely in the following current path: 1. -, Si 2, W2, y13, T l, terminal a, NSt 1, terminal b, t12, y14, .. . ' R, +.

The relay R switches on the exchange dialer DAW via switching means (RH), not shown: 2. -, Si3, DAW, c4, d2, yhl, v11, -E-.

The rotary solenoid of the exchange dialer is now operated in interaction with the relay D in a known manner the step-by-step advancement of the switching arms. Have this reaches the slat to which the calling extension is connected, so Relay C pulls in.

3. -, Si 5, W3, y1, r12, t13, d-arm of the exchange dialer AW, C (2, 1), y2, +.

The relay C stays in the c-wire of the exchange dialer AW and brings the relay R1 of the extension NSt 1 to respond again; Relay T1 is held in the current path The speech wires are switched through with the contacts cl and c2; Relay S closes.

5. -, Si9, X (2, 1), S (2, 1), cl, a arm AW, terminal a, NStl, terminal b, b-arm AW, c2, S (6, 5), X ( 5, 6), but relay X does not pick up in this circuit because its windings are connected to one another. A further relay V 1, not shown, is energized via switching means of the relay S, not shown. The contact s3 closes the loop to the office, whereby the voters are occupied there. The extension then receives the dialing signal via the exchange line that is connected to terminals a, b . The dialing character reaches the extension NStl in the following way: 6. a line from the exchange, s3, y2, first secondary winding of the transformer, C4, second secondary winding of the transformer, y3, h2, terminal b.

From the secondary side of the transmitter, the dialing character is transferred to the Primary side induced and passed there to the extension. This can now be done with the Start dialing the number you want. The circuit is made through the dial 5 interrupted in pulses, with relay S being controlled in the same rhythm. The contact s3 interrupts the DC loop to the office, which on the following The path runs 7. a-line from the office, s3, y2, Dy, y3, h2, b-line to the office.

When relay S drops out for the first time, relay V2 is energized: B. -, Si 1, T V1, s1, V 2, (6, 5), _ v11, +.

During the pulse pauses, relay V2 is held by a dropout delay. At the same time, the rotary solenoid DRW of the inquiry dialer receives a current surge - @ - ". 9. -, Saß, DRW, f1, ty2, z2, S2, cli, v12, By each such current surge the arms of the inquiry dialer are switched one step further. The inquirer is therefore controlled in the rhythm of the dialing impulses sent to the exchange.

A special arm of the inquiry dialer is used after the impulse series, d. H. after the relay V2 has dropped out, the evaluation of the transmitted pulse series is carried out. For the sake of clarity, the example does not include the blocking or activation measures only after the second or a further point (impulse series) do what is easily possible, if in the position, in which a later elimination the Kennzif3m is to be made, an auxiliary relay is switched on each time. By doing cited example, it is determined after the first pulse series whether a blocked access number was selected or the intended connection is permissible.

a) Selection of an activated pulse series After the selection of a permitted pulse series, the switching arms of the feedback selector are in a position in which the relay F is connected to the e-segment of this counter. Relay F therefore picks up: 10. -, Si 11, W5, f 2ty3, F (5, 6), e-Arm RW, ny2 v23, p2, -I-.

The contact f 2 switches on the holding winding (2, 1) for the relay F, whereby ch keeps this relay during the entire exchange call and thus releases it. Contact fl; holds the inquiry dialer again to return it and to make it available for inquiry purposes: 11. -, Si8, DRW, f1, ', dl, p22, nyl, +.

Contact d RWI switching relay D on . With contact dl the circuit 11 is broken and the switching magnet DRW is de-energized. ) The interplay between relay D and the continuation magnet DRW of the feedback dialer continues until its arms reach the zero position. Relay NR now picks up: 12: -, Si 11, NR, eA RW, ny2, v23, Its contact nyl disregards the circuit 11 and prevents the inquiry dialer from automatically turning further. Relay NR continues via contact p. b) Choosing an illegal pulse series After choosing a ni; permitted pulse series, the inquiry selector RWif is located on a lamella to which the relay TR is connected. After relay 172 has dropped out, relay TR comes to talk via current path 13. -, Si11, W5, fty3, TR (6, 5), fr ', n1, e -Arm RW, "y2, v23, p2, via contact ty3 The relay TR switches a holding circuit via winding 2, 1. The relays Y and Z are energized via the contact tyl: The contacts y2 and .rennen the connection to the office. Via contact, the inquiry dialer, similar to that in faults 10, 11 and 12, goes to the zero position. A busy signal is given to the Nebe; lle via route 15. Bz, f6, C 6, S 1 (6,..., - @ -.

The busy signal is induced by relay S1, Wickh6, 5 on windings 1, 2: 3, 4 of relay S 1 in the inquiry path and the actuated contacts y2, y3 and the transformer are routed to the extension NSt 1 . Further impulses can no longer influence the inquiry dialer.

c) Prevention of abuse of the inquiry dialer The circuit according to the invention prevents the possibility of abuse of the exchange dialer and the inquiry dialer as an Internet record without an election to the office having been carried out. This prevents the "Subscriber not dialing" signal from appearing in the exchange and the connection being blocked by the post under certain circumstances. If an extension occupies the exchange line and then immediately tries to establish an inquiry call by pressing the ET earth button, this extension receives the busy signal. The trunk line is assigned as described under A up to circuit 7. Instead of the election to office, however, the earth button is already pressed. Relay X of the exchange line picks up 16. -, Si 9, X (2, 1), S (2, 1), cl, a-Arm AW, terminal a, NSt 1, earth button, +.

Contact x1 switches on relay Z. After releasing the earth button, relay X drops out again, relay Y picks up, while relay Z remains in the following circuit As described under A (circuit 6), extension 1 receives the busy signal. Contact z2 prevents the inquiry dialer from being actuated by pulses.

d) An authorized extension is making an outgoing exchange call If an authorized extension occupies the trunk line, speak over the one that is not shown e-arm of the exchange dialer AW the relay FR, not shown. The contact fr 'switches all blocked connections on the e-arm of the inquiry dialer to relay F and thus to permitted connection paths. All blocked for other extensions Connections are now allowed. Executes the main or night station an outgoing one Public call, this is the result of the e-arm of the public voter (not shown) marked as authorized that there is a relay N, not shown, that too is still being used for other functions, continues during the call. With Contact n1 removes all blocks for these positions, since contact n1 the blocked connections to relay F (6, 5). e) Extension introduces Consultation call After the exchange connection has been established, every extension can Make a consultation call as often as you like after pressing the earth button.

Relay X responds and pulls relay Z according to circuit 17. After releasing the earth button, relay Y responds (circuit 18). In contrast For the process described in paragraph A, c), the extension now receives the dialing character, since the relays Y and K have picked up: 19.-, Si 12, W6, y5, V, d-arm RW, f3, v23, p2, - @ -. The relay V picks up and switches the relay K, not shown, on. Via the contacts v1, k1 and ty4 the dialing character is activated via the capacitor C6 di ^ winding 6, 5 of the relay S 1 and from there, as already described, in directed the inquiry path. The extension can now dial the number of the desired extension participant; the inquiry dialer is via the following Path controlled: 20. -, Si8, DRW, f1, v2, s2, c5, v12, +.

The well-known processes of inquiry traffic are now played through the a-, b-, c- and d-arms of the inquiry dialer. The test process is initiated via the c-wires, the desired extension is called via the a- and b-wires and the voice connection is established. The test process takes place in the d-wire when reversing. These processes correspond to the known state of the art, so that they are not described in more detail.

B. Incoming official traffic For incoming official traffic, special measures must be taken to ensure that inquiry traffic can also be carried out without an impulse to the office. Because, on the one hand, the answering station must also be able to conduct consultation calls, and on the other hand, a night exchange, for example, must be able to pass on incoming exchange connections via the consultation path to other extensions. The relay F is therefore also activated when an external call is received. First, the alternating ringing current from the exchange excites the relay Ar: The relay Ar switches on the relay L , not shown, which in turn actuates the relay F: 22. -, Si11, W5, ayl, F (2, 1), h, +.

After interrogating the external call, the relays L and Ar drop out again, but relay F remains in the circuit 23. -, Si11, W5, f2, F (2, 1), nr3, hl, - [-.

The circuit arrangement specified uses the same as the known ones Orders a lock follow-up mechanism for exiting the impulse series to the office. By the close association according to the invention of the pulse monitoring and identification means, z. B. Inquiry and tracking dialer, relay F, relay Ty for trunk transmission, is the effort for pulse monitoring is reduced; because the relay F will both after sending a permissible series of impulses to the office as well as when one arrives External call is effective, and a switching state is controlled based on its dependency, which prevents abuse of the inquiry dialer, z. B. the use of the official and the consultation dialer as an additional internal connection set or the allocation a free exchange line to a semi-authorized extension. A simplification the circuit arrangement is also achieved in that the same switching state is also brought about by another relay (Ty), which when a addresses an unauthorized series of pulses to the exchange and the transmission of a busy signal causes to the participant.

Claims (2)

PATENT CLAIMS: 1. Circuit arrangement for telephone private branch exchanges with intercom stations with different traffic authorization, which are all connected to the exchange transmission in the same way, furthermore with the exchange line permanently assigned inquiry dialer and pulse monitoring device, which monitors the connection established to the exchange and, if necessary, causes the connection to the exchange to be disconnected, characterized by a switching means (relay F), a) which becomes effective after the transmission of permitted series of pulses to the office, which are monitored with the inquiry dialer (F-winding 5, 6), identifies the established connection as permitted (contact f6), the Inquiry dialer releases its task as a blocking dialer (contact f l) and controls it to the starting position, b) which takes effect when an external call arrives (contact -avi, F-winding 1, 2) and enables an exchange call to be forwarded with the help of the inquiry dialer (contacts f3, f4, f5), c) as a function of this t (contact f l) after sending the inquiry criterion and after switching the inquiry switch (contacts y2, y3) a busy signal is sent to the extension via part of the inquiry path (capacitor C6, S1 winding 5, 6, contacts y2, y3), and by a relay (Ty), which brings about the last-mentioned switching state when sending an impermissible series of impulses to the exchange and at the same time controls the inquiry dialer to the exit point. 2. Circuit arrangement according to claim 1, characterized in that means (relay FR, relay iV). are provided for preferred extensions or for the respective Main or night station cancel the effect of the relay (Ty).