DE494519C - Circuit arrangement for telephone systems with facilities for conducting collective calls - Google Patents

Description

Circuit arrangement for telephone systems with devices for guidance of collective calls In telephone systems: facilities are often required that should allow a -preferred body, a certain number of participants to be able to call at any time for the purpose of holding collective discussions (conferences). The invention relates to a device of the type characterized above, in particular in automatic remote systems.

There are known institutions in which the participants in the conference Bodies first need to be notified to dial a specific conference number. The convener also dials this number and gives an additional series of impulses. Only then can the conference be held undisturbed. The disadvantages of this arrangement are particularly in the very cumbersome operation. When making important decisions is usually a quick and easy connection with the various Participants necessary and therefore a cumbersome special operation to be avoided.

In the case of other institutions, the convener can direct the conference participants switch to his collecting line, but he must always use the facilities of the Use the existing self-connection center. In this case, preselector relays must still be or subscriber relays are modified. Arrangements of this kind are essential Disadvantage that there is always a connection record for collective calls, which usually take longer which in and of itself is already poorly developed automatic systems, which means a significant traffic restriction, especially for private facilities. Furthermore, a subscriber who is currently busy cannot be reached. Even the possibility of storing the call of this subscriber until after termination his conversation does not mitigate this disadvantage for the most important and hasty one Character of the messages in these collective discussions. This comes with orders Kind of adding another conference participant, so are extensive changes in the Plant required.

The present invention avoids all of the disadvantages in that they provides an additional facility for collective calls that is independent of the Circuit devices for individual traffic works. This has the advantage that A connection option is always available for the collective call, whatever is usually required due to the urgency of the collective discussions. The additional device makes according to the invention only of the subscriber lines of the existing ones Liaison center Use, - so that the convener has a currently speaking participant from the central office can disconnect at any time. An additional effort for voters is insignificant compared to the considerable advantages that can be achieved through this effort. In particular, will the connection of further participants to the bus is considerably simplified. In addition, in the interest of economic mass production, the complete system can be executed normally typed and all changes limited to small additional devices.

The invention allows any conference participant to join any Time to switch off from the collecting line and conduct house calls.

In the drawing, the inventive concept is shown in a circuit example. The device has in common: A control switch St. Sch., Which controls the current impulses determined for the various line selectors LW , further six relays J, I, 1I, III, IV and X as well as a current surge pendulum St. P., which controls the control switch and the LW terminated connection brings back to its rest position, also a pole changer PW, which supplies the ringing current and a seconds switch sec., which forwards the ringing current in time segments.

For the collective call line, which, for example, belongs to the preferred subscriber BT , four relays rr, L, Y and U are required for each KO line. The line selector LW and the control switch St. Sch: are ten-part rotary selectors. If necessary, e.g. B. in larger systems, but can also lift rotary selector or any connection devices, such. B. Relay, find application.

As many line selectors are required as there are participants in the collective call. A branch of the lines of the participants is at the multiple contacts of all LW, while the collective line of the preferred participant BT is connected in multiple circuit with the contact arms of the LW.

The switching process is as follows: If the preferred point is on its collecting line Ko. T. has switched on, the J relay connected to it speaks via the following current flow: Minus, fuse i, relay X, relay J, a line via the subscriber loop, back via the b line, J relay, X relay , Plus.

The J relay operates its contacts i2 and il. That with these in K-relay lying in series is connected as a differential relay, so that its armature initially remains in the resting position.

Contact i2 switches on the I-relay, which has delayed armature dropout, while il prepares the surge circuit for the line selector LW , because when the control switch is in the rest position, its contact arm is on the lead to the stepping magnet of the LWl.

Current flow for the I relay: minus, fuse i, relay I, contact i2, plus.

The I relay operates contacts 1i, 12, I4, 15 and IG. Contact Il- prepares the circuit of the G relay, while I2 interrupts the return circuit of the control switch. Contact I4 prepares the surge circuit after the line selector LW, Ir, the response of the III relay. before. ContactIe interrupts the return circuit of the LW. The preferred point BT now selects the collecting line Ko, for example. L. i. With the corresponding current surge, the LW sets itself on this line via current flow: Minus, fuse 2, rotary magnet D 'from the LW, i-contact and arm from the control switch St. Sch., Relay II, contacts il ;, 14 and 1114, plus .

The II relay has attracted its armature during the current impulse and actuated the contact IP.

The relays I, II and IV have copper damping, so that their armature fall off with a delay. The TV relay has been excited by _Korntakt 114 via $ txömlauf : Minus, fuse i, IV relay, contact 114, plus.

The IV relay uses its Xcontact IV4 to switch the control switch to its next position for the purpose of switching on the next. LW before, because after the end of the surge, the II relay is de-energized again. Its contact 114 interrupts the circuit of the IV relay and in the rest position closes the circuit of the rotary magnet from the control switch via the following circuit: - Minus, fuse i, rotary magnet D, contact IV4, 114, plus.

The control switch thereby switches according to the invention with his arm preparatory to the next LW, so that the second LW receives the current impulses with the next following current surges. Meanwhile, the IV relay has also dropped out and, through its IV4 contact, has reopened the circuit of the rotary magnet D from the control switch. This process is repeated after each dialing of a call station to be involved in the conversation. If the preferred point has selected all the desired points, it now presses its call button T. This activates the differential relay K, and one winding of the X-relay receives current via the circuit: minus, fuse i, X-relay, J-relay, a -Line, earthing button, plus.

The X relay switches on the III relay with its contact x4 Circuit: minus, fuse i, III relay, contacts x4, I6, plus.

The III relay operates its contacts III2, III4 and IIIB. The III relay holds itself via contact 1112 when the armature of the X relay returns to the rest position after releasing the T button. Contact 1114 interrupts the impulse circuit to the rotary magnet of the LW, while contact IIIB closes the circuit of the G relays connected in parallel on all the called lines via current flow: Minus, fuse 2, contacts u4, G relay, c contacts and c arm of the set LW , Contacts IIIg and I'-, plus.

The G relays close their contacts g1, g2, g4, g5 and g ". Contacts g1 prepare the circuits for the ringing relay L, while g2 and g" disconnect the speech lines of the selected subscribers from the house network and the connection devices and connect them to the bus. Contacts g4 separate the c wires if an automatic house switch is available, or make the house line busy at other facilities. Contacts g5 close the circuit of the seconds switch sec. Via current flow: Minus, fuse OK, resistance Zoo, F relay, contacts u6 and g5, plus.

Furthermore, the circuit of the PW via current flow: minus, fuse q., Resistance i5o, winding i of pole changer PW, contacts u "and g6, plus.

At the same time, the F-relay closes the circuit for the rotary magnet D of the sec. Via its contact f 4 via current flow: minus, fuse q., Rotary magnet D, contact f4, plus.

A spark quenching, consisting of a capacitor 0.5 juF and a resistor 400 Ohm protects the contact f4. The rotating magnet works and switches his arm away. This means that the L relays of the selected lines receive power one after the other. These periodically attract their armature via the current: minus, fuse4, resistance 3oo ohms, arm and contacts of the sec., L-relay, contacts u2 and gl, plus.

Through the contacts 12 and 1 ″, ringing current is thus sent to the parties involved sent one after the other. (The circuit can also be kept so that the call arrives at all participants at the same time.) Now take the called participants remove their remote receivers, the Y relays of the relevant bus lines pull theirs Armature on via circuit: minus, fuse 2, Y relay, contacts 12 and g2, a line to the subscriber, subscriber station back via the b line, contacts g "and L", Plus.

Contact y "keeps the circuit of the G relay closed, parallel to contact u ¢, while contact y2 switches on the changeover relay U via the circuit: minus, fuse 2, U relay, contact y2, c-contact and c-arm of the LW, Contacts III "and Il, plus.

The U-relay operates its contacts u2, u3, u4 and u ". Contact u2 opens the circuit of the L-relay, while u" interrupts the circuit of the sec. And PW. The second switch runs back to its rest position, where it is switched off by its shaft contact w. The U relay maintains itself via its contact u3 when contact y2 is idle. The preferred location can now speak to all selected participants. If the called subscribers hang up their remote receivers after the call is over, the Y relays are de-energized and their armatures return to the rest position. The contacts y "interrupt the circuit of their G relays, so that they are also de-energized and, through their contacts g2, g4 and g", switch the subscribers from the bus back on to the connection devices of the exchange. The contacts g1 and e finally open the circuit of the sec. And PW. If the preferred point hangs up its receiver, the J relay and thus the I and III relays are de-energized.

The contacts II and III "interrupt the circuit of the U relay of the individual lines. The contact 14 opens the surge circuit, while 12 closes the return circuit of the control switch via current circuit minus, fuse i, rotary magnet D from the control switch, contact I2, current surge pendulum St. P ., Plus.

The rotary magnet from the control switch receives an interrupted current from the current surge pendulum St. P. and continues until it has reached its rest position and is interrupted by its shaft contact w. Spark quenching, consisting of a capacitor i MF, protects the shaft contact. At the same time, the return circuit for the i. LW has been closed by the contact I "via current flow: Minus, fuse 2, rotary magnet Dl, from the LW, shaft contact w1, contact Ig, current surge pendulum St. P., plus.

The i. LW runs into the rest position, where its shaft contact wl interrupts the return circuit and at the same time closes the return circuit for the 2nd LW . A contact dl, which lies parallel to the shaft contact, protects the shaft contact w1 from burning in this case. Well- 'runs_ -the -a. LW via the shaft contacts w2 and W 'to its rest position, whereupon closed by w1 on w2 of the flyback circuit for the rotary magnet D2, etc. In this way, running consecutively all the stops in its rest position. But the circuit can also be made so that all LW running simultaneously in its rest position.

According to the invention it is also provided that when the Y-relay responds and drops out, special indicator and tail lights are switched on so that. the BT subscriber can see exactly when the individual subscribers answer and hang up their intercom again after the conversation. In the drawing, this possibility is indicated by the switching of the lamp JUL in the call station of the subscriber BT , the current flow of which is formed, for example, by the contacts m of the LW and contacts y4 of the .Y relay.

The overall circuit here is such that the subscriber BT can already speak to the subscribers who are just reporting, regardless of the fact that the automatic call continues to the subscribers who are not yet reporting.

According to the invention, it is also possible to connect arbitrary signaling devices to the contacts of the line selector LW instead of speech lines.

Claims (6)

PATENT CLAIMS: i. Circuit arrangement for telephone systems with Devices for conducting collective calls, characterized in that the Collective call line connection devices in the number of those involved in the collective call Participants to be involved are assigned at the same time, through which the head of the Collective discussion between the individual participants without using the switching devices for the individual traffic, = in = which he after occupying the collecting line the phone numbers of the different participants = with - his number switch consecutively chooses. a. Circuit arrangement according to Claim z, characterized in that the surge circuit by a control switch (St. Sclz.) one after the other with the stepping mechanisms - the -participating -participant- is brought into connection. -3: circuit arrangement according to claim z and a, characterized in that after setting the individual Step switches on the desired connection lines of the preferred subscriber the call stream (alarm clock call stream) for all digits at the same time by pressing a button triggers while the shutdown when reporting (picking up the receiver) of the individual Participant takes place automatically. q .. Circuit arrangement according to Claim 3, characterized characterized that with the help of special switching measures the call flow automatically is assigned one after the other to the alarm clocks of the members of the society. 5. Circuit arrangement according to claims r to q., characterized in that when a call is picked up or when removing or replacing the receiver on the microphone units involved at the preferred participant the message and tail lights (signals) come into effect. 6. Circuit arrangement according to claim r to 5, characterized in that when severing the speech or signal lines otherwise intended for ordinary traffic for the purpose of a group call after the continuing part of these lines (the operator, etc.) busy or separator characters are given.