DE667795C - Circuit arrangement for telephone extension systems with dialer operation - Google Patents

Description

Circuit arrangement for telephone extension systems with dialer operation The invention relates to a circuit arrangement for telephone private branch exchanges with dialer operation, in which an existing exchange connection is transferred to the subscriber with which a secret inquiry has been held.

The invention aims to simplify the known arrangements and achieves this by switching means, which the connecting device via the the exchange connection is running, trigger when a consultation call is initiated, Disconnect from the trunk connection and use a bypass route to set them up on the desired participant.

The advantage of the arrangement according to the invention is that the the connection devices assigned to the exchange connection path also for the establishment can be used by secret inquiry connections. and that a change of direction these connection devices are not required when transferring an exchange connection is.

Furthermore there is a special center for the production of internal Connections not required as the automatic private branch exchanges an exchange dialer, an extension dialer and one for each connection option Have auxiliary dialers through which incoming trunk connections, outgoing trunk connections, Inquiry calls and internal house calls can be established.

In the embodiment shown below, it is assumed that that the extension telephones with a toggle key (ut). are provided that are over Earth acts on switching organs in the exchange. Of course this arrangement is not essential to the concept of the invention; because it can just as well a special line button or other switching device is applied will.

In the exchange, each subscriber line is assigned a step relay R with two windings of different resistance and a switchover relay UI. The connection sets consist of: exchange dialer AW, extension dialer NW, auxiliary dialer HW, remote switch FS, resistor Wp, relay F, X, FI, Ph, Pa, G, S, N, Z, U, I, 1I, J, P, Y , T, K and V as well as the capacitors Ca, Cb, Cs, Cw, Cm and the choke coil D. Each exchange line also includes the relays AR, L, A, E; H, W, Wt, SV and 17 sec., Also the resistor Wl and the capacitors C and Cp. The trunk call lamps AL are assigned to any extension that becomes the main unit.

If a call arrives on the exchange line P a b , the relay AR is initially excited by the ringing current from the exchange (a-branch, left winding AR, capacitor Cp, right winding AR, b-branch). The relay AR excites the relay L (+, ar, L, ), which is self-sustaining (+, NU, e2, i L, -) and at the same time the outside call lamp A: Ü, -switches on (+; 13, AL, - ).

An extension, which is intended to be connected to the terminals N a b in the drawing, now picks up the receiver, which energizes the step relay R (+, r2, extension, r1, left winding R, -). The resistance of the left winding is dimensioned so that, although contacts r3 and r4 are closed, contacts r1; r2 and r5 cannot be opened. The relay R energizes the general relay C (+, r4, r5, C, -) and also applies its right-hand winding to the test line cl through r3. The relay C connects the impulse pendulum SPI via the step switch HS to the rotary magnet MI of the auxiliary unit selector NW ( +, SPl, c, HS, pal, g2, MI, -), which turns its switching arms a, b, cl, c2, d, e for so long; until the test relay Pa is excited in a known manner via the right winding of the step relay R (+, v1, ü2, Pa, u ', cl, r3, u I', R, -) and the extension selector stops by means of pal and pa2. The relay Pa switches the auxiliary unit via the impulse transmitter to relay J (+, right winding J, p3, transmitter, g4, n2, pa4, b, U12, auxiliary unit, u Il, a, pa3, W, g3, transmitter p2, left winding J, -), while the step relay R fully attracts its armature and thereby opens the contacts r1, r2 and r5. Relay J responds and energizes the delay relay K (+, p1, i, K, -). The subscriber hears the known free signal (in the drawing the signaling, because confessed, is omitted) and then switches on to the exchange connection by dialing the number z using his number switch. In this case, a current surge is sent into the line in a known manner; which acts on the relay J and thus on the rotary magnet MIII of the exchange dialer AW (+, p1, i, t ?, k2, MIII, -). At the same time, the delay relay V is energized in parallel with M III, which switches over its contacts. The switching arms of the exchange dialer AW turn to the first contact group.

If the relay V now releases its armature, a circuit is closed via the relays P and Wt (+, v2, P, e, svl, w, Wt, -). Both relays respond. The relay P switches the extension through to the exchange line by means of p2 and p3, while the relay Wt prevents other subscribers from freely dialing W to the exchange line. The relay A pulls, excited by the local current, its armature and energizes the relay E (+; a, E, -). The relay E causes the exchange call lamp AL to go out through e '-' and at the same time excites, while it is in its own holding circuit (+, e4, sv2, E, -), the relay H (+, e3, W1, - ). Both relays cause the main line to be free again after 3 or 20 seconds when the handset is hung up: During these processes, the auxiliary selector HW, driven by the current surge pendulum SP2 via pa ', has set itself to the extension. The correct setting is made as soon as Pa has responded via the corresponding line d with the aid of the test relay Plt. The switching arms a, b, c, d of the auxiliary selector HW rotate until the test relay Ph is excited via the resistor Wp (+, Ph, switching arm d of the auxiliary selector HW, Leiturig d, switching arm d of the auxiliary unit selector NW, W p , -) and shut down the voter through plc.

If the extension that took the call wants to pass the same on to another extension, it briefly presses the toggle button ut and causes the relay I to be energized via earth and the transformer. The relay I energizes the relay II (+, h, 1I, -), which prepares the switching on of the relay U via the contact III. If the ut key is released, relay I also releases its armature and, due to the delay effect of relay II, briefly closes a circuit via relay U (+; 1I, II1, U, -). The relay U responds and excites the relay UI (+, u1; c, UI, -), which de-excites the relays Pa and R through u13. The extension selector NW rotates into the basic position (+, SPI, e, pa2, z2, MI, -), while the position of the auxiliary selector HW is not changed as a result of the transfer of the contact u4.

The relay UI also separates the voice line N ab by means of u Il, u 12 from the multiple field of the extension selector NW and switches over to the relays F and X via the switching arms a, b of the auxiliary selector HW (+, right winding X, üe, b, uI =, extension u Il, a, u5, F, left winding X, -). Relay F responds while relay X (differential relay) is not energized. Relay F energizes relay G (+, f2, G, -), which in turn keeps relay U energized (+, g5, U, -). The contact u3 in connection with the choke coil D prevents the exchange loop from being interrupted.

Now the extension can operate its number switch and set the extension selector NW to the desired other participant. The relay F picks up the current impulses and transmits them irr -be'kännter way to the rotary magnet MI {+, f2, pal, g2, MI, -). At the same time, the relay S is also energized, which during the movement of the switching arms a, b, cl, c2, d, e flips its contact s1.

If the selected subscriber is free, the relays Pa and R respond after dialing the number (+, fsl, s1, u2, Pa, at ', c2, uI3, right winding R, -). Ringing current is sent to the extension via contacts n1 and n2 until subscriber B picks up the receiver and thus makes the feed relay FI respond. This relay interrupts the supply line rm of the relay N to the calling machine through a contact (not shown), whereby the periodic call is stopped. The conversation between A and B can begin.

If the called extension declares itself ready to take over the exchange connection, the extension that forwarded the call simply hangs up its receiver, which de-energizes relay F and thus also relays G, U and UI. The connection to the other extension is established via contacts g3 and g4, to which the auxiliary selector HW now also adjusts, as already described. If necessary, the second extension can now also press its toggle button and thus forward the connection to other extensions.

If, when dialing another extension, it happens that the subscriber is already speaking otherwise, the test relay Pa cannot, as is known, switch through due to the potential difference. In this situation, the calling extension must be given the opportunity to attempt the connection with the exchange subscriber such as.deraufzu@nahm; en and possibly the assignment to another extension. The remote switch FS is provided for this purpose, which switches its contacts over in response to a given current surge and returns them to the basic position when the next current surge occurs. When the switchover key ut is repeatedly pressed, the current surges are produced by the differential relay X, which responds in a known manner via earth and its left winding. The further processes are structured as follows: If the extension A finds the selected extension B occupied after the extension selector NW has been controlled, it briefly presses the toggle button for the second time in order to resume the exchange connection, thereby causing the relay X to respond. The relay X energizes the remote switch FS, which flips its contacts. Extension A is now re-connected to the subscriber via fs2 and fs3 while the extension dialer is turned to the - basic position due to de-excitation of relay Z, which had previously been held at the first current surge of relay F via contacts x, z1 and ge ( +, SPl, e, pa ', z2, MI, -). The transfer of the extension selector to the basic position also takes place when the relay Pa (e.g. when a query is made by extension A) has already been energized, namely is. the connection between extension A and extension Bin is terminated in this case by contact fsl.

If the exchange connection is to be forwarded to another extension at the request of the exchange subscriber when extension B is busy, extension subscriber A again briefly presses the toggle button ut and thus controls the contacts of the remote switch FS, as indicated, back to the original position. The speech connection with the subscriber is canceled by fs2 and fsl, while the relay Pa can respond again after another number has been dialed via f s'.

If the extension that last took over the external call hangs up the receiver, then relay A is also de-energized when the relay in the transformer is de-energized and the relay SV (+., A, es, SV, -) is energized. This relay is constructed in such a way that it does not attract its armature until after 3 seconds with continuous excitation, but not at all with intermittent excitation. The relay SV interrupts the holding circuit of the E relay by means of sv2 and at the same time releases the series connection of the relays P and Wt at svl. The relay P is de-energized and the connection collapses due to the de-energization of the K relay.

In order to establish an outgoing exchange connection, the calling subscriber N picks up his receiver and thereby causes the dialer NW to be set to the calling connection line. After setting the voter NW, the exchange dialer AW is set to a specific one by the exchange code o. Contact row set. The voter AW selects a free trunk line. If a free exchange line is found, the relay P responds via the switching arm c of the exchange dialer AW. The relay P causes the connection to the contacts p2 and p3. The trunk line is blocked by short-circuiting one winding of relay P via contact p4.

For special connections there is also the possibility that the public dialer AW through a certain code number to a very starry trunk can be adjusted. An exchange line can thus be freely chosen and once on the other hand, a specific one of several trunk lines can also be occupied.

Internal connections are established in that after lifting the handset in the calling extension N and setting the dialer NW to the calling connection line by pressing a button, the dialer is triggered. NW is brought about and the bypass route is completed via the auxiliary selector AW. The calling extension N then sets the selector NW to the second desired extension. The individual switching processes are exactly the same as those described for establishing an inquiry connection.

Claims (16)

PATENT CLAIM: i. Circuit arrangement for telephone extension systems "with dialer operation, in which an existing exchange connection can be transferred to the subscriber with whom a secret inquiry has been held, characterized by switching means which trigger the connection device (NW) via which the exchange connection runs when an inquiry connection is initiated , switch off from the trunk connection and enable their setting to the desired subscriber via a bypass route. 2. Circuit arrangement according to claim i, characterized in that the connecting device (NW) is a dual mode selector is trained. 3. Circuit arrangement according to claim i and 2; characterized in that the dual mode selector (NW) adjusts itself as a call seeker to the calling subscriber when the receiver is picked up and connects him to a connection device (AW) for establishing an exchange connection. 4. Circuit device according to Claims i to 3, characterized in that after setting the dual mode selector an auxiliary selector (HW) sets the same subscriber and changes the bypass route prepared the dual mode selector. Circuit arrangement according to - Claim 3, characterized characterized in that the initiation of an outgoing exchange connection by pulling a code number (o). 6. Circuit arrangement according to claim 3 and 5, characterized characterized in that the connecting device (AW) when pulling the code number for outgoing exchange connections as a selection on a free connection line (P) adjusts. Circuit arrangement according to Claims 3 and 5, characterized in that a connecting line (P) also by pulling a specific one assigned to it Code number can be assigned. B. Circuit arrangement according to Claims 3 and 7, characterized characterized in that the connecting device (AW) when pulling the code number for a certain connection line as a line selector on the connection line (P) is set. G,. Circuit arrangement according to Claims i to 4, characterized in that the connecting device (AW) for establishing exchange connections is disconnected and the bypass path around the dual mode selector (NW) is closed by a switching measure (keystroke) by the calling subscriber. ok Circuit arrangement according to Claims i to g, characterized in that house connections are also established via the dual mode selector (NW). i i. Circuit arrangement according to Claim io, characterized in that the initiation of a house connection by Lifting the handset and pressing the earth buttons of the calling station takes place. i2. Circuit arrangement according to Claims i to ii: characterized in that a holding device (D) is switched on in the occupied connection line by actuating the earth button with an existing exchange connection with the closure of the bypass path around the dual mode selector (NW). 13. Circuit arrangement according to claim i, characterized in that the transfer of the trunk connection by hanging the Handset at the inquiring extension takes place. 1q .. Circuit arrangement according to claim i to 13, characterized in that when the relocation incentive is given, the bypass route to open the double operation selector (NW) and the connection path via the to manufacture of trunk connections serving connecting device (AW) switched through again will. 15. Circuit arrangement according to claim i to 14, characterized in that the auxiliary selector (HW) adjusts itself after the exchange connection has been transferred to the second subscriber and prepares a new bypass route to the double operation selector (NW). 16. Circuit arrangement according to claim r to 15, characterized characterized in that when the earth button is pressed again on the part of the inquiring party Participant a switching means (FS) comes into effect, which the dual mode selector (NW) triggers and switches the trunk connection through the bypass route.