DE1512852B2 - Circuit arrangement for telephone private branch exchanges - Google Patents

Description

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The invention is based on a circuit, the duration of the fall time of this additional relay arrangement for telephone private branch exchanges with the duration of the first call is determined. In the case of a relay that, after a series of dialing pulses, is this circuit arrangement for generating a dialing device against further series of dialing pulses of the first call, the use of a likewise locks, and indicates a possibility of requiring additional relays in such an approach. If, according to this principle, a first call is to be generated, that is to say, a call is to be sent out of a first call in private branch exchanges with several, which are generated immediately after dialing a number, internal connection records are used and can be heard by the calling subscriber as a free range for each of the internal connection characters and an additional relay required from the usual rhythms,
mix callsign and dial tone is replaced. io The invention provides a circuit arrangement

Various circuit arrangements for telephone private branch exchanges have already been specified,

gene known for private branch exchanges, in which one in which the identified disadvantages of the known

such a first cry is sent out. In a sol circuit arrangements are avoided and a

circuit arrangement (German interpretation document Erstruf without additional effort by the co-

1 112 756), the one used for small private branch exchanges anyway in the private branch exchange

is thought, the rhythm of the signaling is generated by existing relays. The invention

a working together with a capacitor starts from the consideration that in each

Relay with two. Windings determined. Thereby a relay is available that

the dialing device by charging and discharging the capacitor after a series of dialing pulses

Controlled relay blocks against further dialing pulse series at the beginning of the number stream 20. This lock

Pushing is brought to a defined starting position, and the starting point is usually carried out immediately after the end

who out after the number surge for a series of dialing pulses. However, since between two

always the same dimensioning of the ringing current application in successive dialing pulse series even in the

worst case for the first call and the pause until further call, d. i.e. if after choosing one

is controlled. The defined starting position then becomes a one again by mistake, for example

achieved by dialing one by the number, always a longer time from the normal

If the relay is affected by current impulses and if more than 800 ms elapses at the start, this relay can

same the rapid discharge of the capacitor and during this time to send out a first call

possibly the immediate fall of the dial-up used.

brings about signaling controlling relay. Duration 30 The invention is thus characterized by

of the first call and the rhythm for the further call that the relay that, after a series of dialing pulses, the

is thereby by switching on the discharging dialing device against further series of dialing pulses

Condenser together with another Konsperrt, with a time delay after the end

capacitor immediately after the end of the number of a series of dialing pulses, "but before the possible

Current impulse delivery determined. 35 sending out another series of pulses, becomes effective

A major disadvantage of this circuit arrangement and thereby switches off the ringing current for the first call, The reason for this is that it can only be used to a limited extent and is complex in its design. To the moderate extent by dropping one at the beginning One is such a circuit arrangement namely a series of dialing pulses responsive and immediate Can be used for private branch exchanges, the relays dropping only 40 bar after the end of the series of dialing pulses have an internal connection set, because with more than one switched on.

reren internal connection sets that the dialing signals would give more advantages and details of the invention controlling relays are not allowed to be shut down, are explained in more detail below in an exemplary embodiment, otherwise a signaling for the other or the other with reference to the drawing.
Making connection sets impossible. If 45 In the drawing, only those parts of the private branch exchange systems with several connection sets that are essential for the explanation of such a circuit are indicated for the private branch exchange of the invention. Its function would have to be a separate one for each internal connection set. Switching functions to be seen in one. In addition to the necessary, 5 ° electoral process explained.

If the calling subscriber takes his listener factor in the fact that even with application to secondary, there is an additional cost, so the non-display system is switched on in the usual way with only one connection set for set feeder relays /. As a result, the generation of the first call is generated by the relay, which is influenced by its contact i, the windings II, the number current impulse. 55 and III of the relayP via the contact /? ^{11 is} pre-requisite. The introduction of a first tier must tend towards the plus potential. This relay F therefore even in this case with the installation of a relay that is not yet separate in this switching state can be bought. speak, as the possible connection to the minus

In other known circuit arrangements for potential via the dial-up telephone private branch exchanges framed by dash-dotted lines, the first call ⁶ ° facility is not yet established. In the case of the subsequent generated by the fact that a relay that drops at the beginning of the following number dialing responds to the looping of the number current impulse and after the interruption the relay / rhythmically drops so that the end of the same drops out and, among other things, the contact / rhythmically in the example shown serves to return during the number stream rest position.

push to switch off the call line, another 65 at the first impulse, i. H. at the first return

is assigned to a drop-out delay relay that speaks after contact i has returned to its rest position

Responding to the first relay switched on and after the relay V 7, not shown, to that until

Drop-out of the first relay is switched off. Remains attracted by the end of the election. This will

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once the contact ν 2 ^{1 is} opened, so that no alternating voltage can be transmitted to the relay / and thus a return of the contact i call lines 1 to 10 during further series of pulses, ie a further drop in the dialing process. For the rest position shown no switching operations other contacts v2 ⁿ and, ^to a can trigger v2 in the selector more
closed. The latter places the dialing device; 5 Through the contact p ¹ , the preparatory dialing is set to the minus potential. If the impulse device set call line from the alternation ended, ie the loop closed again, the voltage is switched off, which means that the relay / reacts again, and contact i switches the first call sent again, which is caused by the relay V 2 dropping out. Even in this switching state, however, that which has been switched on can be ended. Do not yet address this first relay, since its winding-up call appears to the called subscriber as Rufgen II and III through the contact ν 2 ¹¹ short-circuited characters, while he is not known through known ones. Switching means provided at the calling subscriber ■ By closing the contact ν 2 ^nI , however, a dial tone can appear. The following rhythdie coil I of the relay I address; As a result, ringing and dialing tones / are closed by the contacts I ¹ , I ^ir , 1 ^IU . If 15 rhythmic addressing of a not shown only number 1 was selected, this ends the relay R and corresponding switching of the Kon-dialing process and the call line 1 is generated by clock r. This relay can either be connected to contact I ¹ . If, however, a higher rhythmically working relay is selected and an example number is selected, then with the second pulse and wise also from a corresponding return of the contact ζ in 20 cooperating relay with two windings with a capacitor, its rest position via the closed contact l ^{n will} exist the rhythm of the signaling is operated by winding II of relay I and winding I of the correct and possibly also silent during the dialing k) relay II switched on. The relay II speaks thus can be set.

on, and it is through the contact 2 ^ra the Wick- Da through the relay P the selector so treatment I of the relay I is switched off and the contact 2 ¹¹ 25 is to be blocked that no subsequent pulse and the contact 2 ¹ closed, that is, is located serie the setting of the selector changes, the contact i in its working, not shown, the pick-up time of the relay P, which is the duration of the position, so only the winding I of the relay II first call is determined, selected so that it is shorter switched on. Consequently, via contact 2 ^{1 is} also considered to be the shortest duration in which a next dialing can only establish a connection to the call line 2 and a series of 30 pulses can appear. This shortest duration the connection to the call line 1 via the contact I ¹ would then be achieved if opened again after dialing. When the number 3 is selected, a one is then immediately followed by another one, the switching process takes place accordingly in which the would be selected. However, since this time is also relatively long winding II of relay II and winding I des (approx. 800 ms), a sufficient time relay III is always switched on and thus contact 3 ^{1 is} available for the duration of the first call , closed and contact 2 ^{1 is} opened. In this way, the relay P, which is used to block

After the end of the dialing process, the dialing device is used at the same time to generate

one of the call lines 1 to 10 can be used in preparation for a first call, so that

switches. You will then by the dropping of the after this the need for an additional relay

Elective falling relay V2 and thus after 40 is omitted and such a private branch exchange

Return of the contact ν 2 ^r to its rest position can be produced more cheaply than before,

via the contact p ¹ and the contact ν 2 ¹ final It goes without saying that the

switched through. set delay circuits; for relay P only

By opening the contact v2 ^u , one of several possible examples in the frame simultaneously shows the windings II and III of the relay P 45 of the invention. For example, instead of being switched into a circuit, the ground of the illustrated pull-in delay circuit, which is connected via contact p ^u , contact i, windings II from winding III of relay P and the condensate and III of relay P and the corresponding Sator C, any other suitable dialed number closed contact of the delay circuit can be selected. Sample measures l ^m , 2 ⁿⁱ , 3 ⁿⁱ , ... 10 ^m to the minus potential 50 wise can run with the same success as a delay. Since the windings II and III of the relay P, circuit a thermistor with a winding of the relay P, as can be seen from the soldering lug designation, relay P are connected in series or another are connected in opposite directions, the Ma- known delay circuit used, fluxes the two Windings with current flow Particularly advantageous and little effort is due to both windings against each other, so that the use of an electronically delayed switch in this case the relay P is not yet effective, in which ν 2 ^η can become after opening the contact. Since the winding III of the relay P in a transistor, the winding II of the relay P is connected in series with a capacitor C , the charging time of a capacitor is short-circuited. Such the relay P thus only effective after the Kon switch can, for. B. be obtained when the capacitor C is charged and thus the current flow 6 ° shown example instead of the winding ITI of the winding III of the relay P is ended. Only relay P a transistor with collector and emitter closed at this moment the contacts n "and p ^{T of} the winding II of the relay P are connected in parallel and switched to the lens (not shown). A capacitor between the collector and the base and the switching of the contact p "the Wick- between base and emitter is turned on, a rectifier to ^ eordlungl of the relay P, as Haltewick- 65 _ne t _w ill. Such a transistor is used and the contacts delayed entsprelung p ^l and p ^TI in their arrival accordingly the dimensioning of the switching elements holds just drawn position. Through the contact p ^u , the dialing device is blocked for a certain period of time, so that lais P and thus determines the duration of the first call.

Claims (3)

Patent claims: 1. Circuit arrangement for private branch exchanges with a relay that follows a series of dialing pulses blocks the dialing device against further dialing pulse series, characterized in that that the relay (P) with a time delay after the end of a series of dialing pulses, but before the possible transmission of a further series of pulses becomes effective and thereby the Disconnects the ringing current for the first call. 2. Circuit arrangement according to claim 1, characterized in that the selection device The blocking relay (P) has three windings, of which winding II at the end of the election is switched on, the winding III in series with a capacitor (C) and in opposite Switching direction of winding II is connected in parallel, and winding I serves as a holding winding, which is switched on when the relay (P) is picked up. 3. Circuit arrangement according to claim 1, characterized in that the winding II of the the selection device blocking relay (P) when switched on for the duration of the charging time of a Capacitor is short-circuited by a transistor. 1 sheet of drawings