DE2260023B2 - Circuit arrangement for making the telephone number of a calling subscriber visible to the telephone set of the called subscriber - Google Patents

Description

Sends the signal on the speech path that is desired.

The fact that it can be determined where the call is being laid, and logical linking organs (OL) come without the conversation team coming into contact with each other when the connection of the 20 has been established, is particularly useful for guiding the called subscriber important with the mediation of disruptive participants. In addition, it is possible to find out for whom the missing signal is intended for the transmission of the number of the call, before lifting the handset of the calling subscriber and a subsequent one, whereby the participation of a stranger signal for the transmission of the Call flow to 25 on the conversation is avoided if several people generate the called subscriber and that they have access to the same telephone device on the telephone set of the called part. In working environments with an operator having a receiving arrangement (R ') for the internal telephone network, where there are fixed bilateral numbers of the calling subscriber in secondary connections between people, it is possible to connect to the loop (a, b) It is wise to avoid undesirable connections using a separating filter (F) to divert the fertilizer.

The called subscriber also has the possibility of a criteria _{scanner (AZF 1} ), which enables a selection between the subscribers for the voice frequency to match the equality criteria with which he enters into the telephone connection, a criteria identifier (/ C ), who can use the 35 and look for those subscribers to digit impulses and the intermediate digit pauses with which he wants to speak directly, while identifying and at separate exits digits he leaves the task to the rest of the staff to emit the impulses and digit identification impulses to answer calls that come from someone else a digit counter (C) that identifies the digit caller.

ration pulses counts, a distribution circuit (D), 40. It is also possible, if necessary, to determine the call to different outputs each of a subscriber who assigns corresponding digit pulses because of a preceding digit. temporary absence of the called party had received a pulse counter (CZV ₁ , CN ₂ , CZV ₃ ) for each answer, if the number of the digit that counts the digit pulses, as well as the last calling subscriber not only on the display device (V), that appears from the outputs of the phone of the called subscriber, can be controlled by a pulse counter. but also remains stored in storage elements

2. Circuit arrangement according to claim 1, there and then can be read.

characterized in that in the receiving arrangement the invention consists of a transmission device (R ') , the separating filter (F) in a second direction, which derives the call signal in the output of the central switching center, a call signal 50 is installed, and a receiving device, the sampling circuit (RlV ₂ ) at the output a signal for the telephone subscribers is installed, which emits the entire duration of the call, an order want to use this service,
voltage (R) of the transfer means for the transfer hook switch generated for detecting the state of a signal indicating that the address or number of the calling remote closing of the hook switch, and a 55-speaking participant modulated on the basis of a Be-Einschaltsteuerschaltung (ACC), a Output missing signal with the number-forming direct current signal is generated if the output criteria are simultaneously a voice frequency and sends the mode signals of the call signal sampling circuit and the connected signal to the corresponding speech path, the order for determining the state of the fork in the exchange of the calling party Partial toggle switches appear indicating which qualification holder is being used. Furthermore, (logical) tasks (DF) are controlled for the display elements. linking organs are provided, which upon determination of the

3. System according to claim 2, characterized in that the connection of the line of the called part marked marked that the arrangement (R) for determining takers with the voice line of the calling part of the state of the hook switch with their takers of the transmission device for the Num output signal separating elements in to the Line 65 mer of the calling subscriber opens the command signal and loop (a, b) of the subscriber connected a subsequent command signal for the transmission wires of the receiving device. of the call stream to the called subscriber.

The receiving device for receiving the The number of the calling subscriber is connected to the voice lines in a shunt and contains:

A separation filter that derives the modulated voice frequency signal at the receiver,

a criteria scanner which determines the speech frequency takes the DC criteria,

a criteria identifier representing the digit pulses and identifies the inter-digit pauses and the digit pulses and the pulses at separate outputs submits for the digit identification,

a digit counter that counts the digit identification pulses,

a distribution circuit that sends the digit pulses corresponding to each digit to various outputs assigns

a pulse counter for each digit, which counts the digit pulses counts

as well as display elements that are controlled by the outputs of the pulse counter (made to light up) will.

Further features of the invention emerge from the following description and the drawing a non-limiting example for realizing the invention. The example relates to the application of the invention for a house or private branch exchange with three-digit numbers existing subscriber numbers. It shows

F i g. 1 a block diagram of the system,

F i g. 2 shows in detail the circuit arrangement of the receiving device,

F i g. 3 shows some waveforms of the circuit arrangement of FIG. 2.

1. The transmission device contains a transmission device TI belonging to the exchange CC for transmitting the number of the calling subscriber to the apparatus of the called subscriber UT on the telephone line loop a.fr. The pre-selected code consists of DC criteria which are to jog to those sent with the rotary dial; In addition, there is a signaling start criterion and a criterion for the end of the signal transmission. The waveform of a signaling corresponding to the number “233” is shown in diagram L in FIG. 3 shown. The transmission device TI modulates a tone frequency of 425 Hz with the direct current criteria, which it transmits to the line loop of the called subscriber. Logical linking organs OL control the transmission of the number as soon as the connection between the telephone line of the calling subscriber and the line of the called subscriber has been established in the exchange, and prevent the transmission of the call flow until the number has been transmitted in full. The practical implementation of the transmission device and the linking devices that monitor it depends on the type of switching system in which the system is used. In the case of a time division multiplex private branch exchange considered here, the transmission device consists of a 425 Hz oscillator which is connected to the speech line via a switch like any other telephone line. The modulation with the direct current signaling takes place by means of this Schaltfrs (such a modulation method is described in the Italian patent 834 797).

In the receiving arrangement R ' , the separating filter F separates the 25 Hz signal from the modulated 425 Hz signal. A criteria scanning device R / K extracts the modulating pulse signal from the audio frequency, thereby restoring the waveform as shown in FIG. In the L waveform, the pulse S _x with a duration of 32 msec is a criterion for the start of signaling (start). The pulse S ₂ of the same duration is a criterion for the end of the signaling (stop). The numbers

> ° and both of the above criteria are through. Pauses P ₁ , P «, P ₃ , P ₄ interrupted by a duration of 32 msec" Each digit consists of a pulse sequence of 16 msec, which are interrupted by pauses of the same duration.

A criteria identifier / C identifies the digit pulses and the pauses between digits, with digit pulses and digit identification pulses at different outputs, that correspond to the pauses between digits. A digit

counter C counts the digit identification pulses. A distribution circuit D assigns the digit pulses corresponding to each digit to various outputs and sends them to a corresponding counter CN ₁ . CN., Or CN ₃ . The outputs de. Counters are on

^a 5, a decoding circuit DF is connected, which converts the input signals into excitation signals for the display elements V which provide a visible display. The decoding circuit only emits the output signals when they are caused by a sequence of ignition

or key commands R _Ar .c is fed, which are generated by the circuit ACC. This takes place when the call signal sampling circuit RIV _{2 is} activated in the presence of the first train of the 25 Hz oscillation of the call signal. The sampling circuit remains

activated for the entire time that the callsign continues, and also for a specified period of time thereafter.

The circuit R * for determining the state of the hook switch finally causes, with a command signal R _r, the opening of isolators r of the wires of the receiver connected to the line of the telephone subscriber when the handset (receiver) is lifted, and causes the optical display elements for the

the entire time the handset remains off-hook.

T \ z. 2. The distinction between the signals of 25 Hz and 425 Hz takes place in the filter F on the basis of their amplitude, since the 425 Hz signal with

a significantly lower amplitude than the normal amplitude of the ringing current is fed. In the voltage divider consisting of the resistors R ₁ , R ₂ , Rz , the voltage applied to the ends of R ₂ , which is caused by the 425 Hz signal, is sufficient.

is gentle, is not enough to bring the transistor T into the conductive state, in contrast to the ringing current. The input filter contains a bandpass filter with a tuning frequency of 425 Hz, consisting of the transformer TR ₁ , the capacitors C ₁ , C,

C ₃ and from the inductances L ₁ and L ,.

The 425 Hz signal at the output of the filter is _{fed through the capacitor C 4 to} the input of an amplifier of the A class, consisting of the transistor T ₂ and the resistors R ₅ , R ₆ , R-.

R ₈ . The output signal of the / 1 amplifier is applied via the diodes D ₂ and D ₃ , which form a voltage threshold, to a limiting stage, which consists of a transistor T ₃ and the resistors R ₈ ,

5 6

R _1n consists. This sends the signal to the monostfbi terminals, the lighting up will be automatic

len flip-flop LA, which causes the ACC circuit to be determined. In the further course

of the 425 Hz signal is used. The circuit described, the description is assumed that the terminal

The scanning device RIV ₁ represents the device. Men A, P are open. When the fork cover is open

The two outputs L and Z of the monostable ⁵ ^ holder (handset placed) is located in the

Trigger stage LA control the two monostable trigger outputs of the NAND element / V _{10 on the potential}

stage M ₁ and M ₂ in the criteria identifier IC, ^tial '<accordingly, the activation of the display

which have a relaxation time of 24 msec. From ^ΟΙ \ ^{3ηε d} ™ ^{ch the} output signal W _{25 of} the mono-

the flip-flop M ₁ and of the NAND gate / V ₁ ^s loading controlled ^"tabllen multivibrator MU. For the whole

standing logic circuit identifies the start ¹⁰ ^ ^{ΙΙ Γ 3} "" ^{the de r} call flow is ubenandt ^

and stop pulses, with which the digit counter C on <« ^{nd for} the following 4 seconds, is this

The beginning and the end of the signaling reception trigger stage activated (M au potential 0), and the

is set to zero "Display organs are illuminated. The called

identifies the pauses between digits and the pail _{contacts where the} signaling reception

isolated the start pulse and the stop pulse each ^, itungsschleife _{yon of Le} sen,

follow and precede, and thus the reception of _{built simultaneously} f _{ti when the mono rod} ji _e multivibrator Mt;

single digits. The monostable _{multivibrator M 3 ao aktivi} ^ _{comes via the NAND} . _G K _{dN a}

receives pulses corresponding to the rise-to-front toggle _{command for the bistable multivibrator}

edge of the oscillation at the output of the NAND- _{B whose} % _{via the ΝΑΝΟ} . _ο } ;; _{αΛ? ei} ^

Limb / V ,; These pulses control the Vorwartsschal- _s j _{"yom Bin} | rwirt 0 to the input of NAND

* ™ f ^d «digit payer C. The _{outputs of the digit element N from s0 so that the display} organs when loading

SnS ^{re, nZ11 era} v _W v? ^r i; ^d "K ^ame ; \ » 5 endiguni, the activation state of the monostable

NANp-Ghedern / V ₃ , ^ ₄ , / V consists of which on _{| s flip-flop Mt /} remain switched on. So-

If the content of the payer C is _{put on the} handset's output inbox, this brings that

pulse of the monostab.len multivibrator M the counters CN _Si , _from ßinary value 0 at the output of the inverter I ₁

Set CZV ₂ CZV to zero before _{adding the number - the bj-stable toggle switch B as} § _{he left in rest}

impulses CK ₁ , CK ₂ , CK ₃ arrive. The latter are, _{of dn Si, from Bm} ^l _{AETV / s, at the output}

p _{1 2 3} , _{the one Si} , _from wnämen 1 at the output directly at the complementary output of the mono of _the NAND gate / V ₁ . corresponds to, deleted the i _{ze g} eorgane so that the flip-flop Anstabilen LA derived and, and the system for the said counter (register) via the NAND gates _Ad i _ge a new signaling is prepared. ZV ₆ , / V ₇ , / V ₈ distributed in sequence from the off _The bistable flip-flop B ₁ does not switch. when the output signals of the digit counter are scanned. _{3J the} monostable multivibrator MU is not activated.

In the three counters CiV ₁ , CZV ₂ , CZV ₃ is at the end. This excludes the lighting of the display devices of the signaling of the number of the calling remote, if the subscriber includes the subscriber. The in counters corresponds apparatus for its own call used preserved information reaches over decoded more Activated shot circuit MU is zurungsschaltungen DF _1, DF _2, DF ₃ reset the display ₄ "wenr> at the same time to receive organs V ₁ , V ₂ , V ₃ . When the next following device appears, signaling another calling signaling, the counters will reach zero telephone subscriber. The reset is set, and they store the new number up to one is controlled by the pulse RR ₁ , which appears and arrives at the same time as the number from the switching center gang of the NAND element N _3. The lighting of the display elements is from _{45 TO} r zero setting of the counter CN ₁ is used. The described approval by the lighting control switch circuit arrangement is dependent on a supply / ICC which, when the 25 Hz ringing circuit (not shown) arrives, supplies the power supply which is activated. When the ringing signal assumes a DC voltage + VCC with a value of a certain polarity, it causes the 5 V to be supplied.

Saturation of the transistor Γ, by corresponding ₅₀ Fig. 3. All the waveforms shown flow in the resistors R ₁ , R ₂ and in the base to the calling number 233. The emitter junction of the transistor T ₁ . Vibration L represents the modulation signal that

At the output of the transistor T ₁ or at its output of the monostable multivibrator LA

Load resistance R _A gives you pulse trains that seem to be one. The signal LM ₁ contains a pulse

monostable flip-flop Mi / with a relaxation time 55 speaking of the falling edge of the stop pulse and

from 4 to 5 seconds and of the type that each serves to reset the counter C to zero. That

Input signal of the relaxation cycle repeated, too- Signal LM ₂ contains a pulse corresponding to the

be directed. It remains switched until the calling rising edge of the start pulse of the signal L and

signal has ended, and during the 4 to 5 seconds a pulse corresponding to the beginning of each

those that follow the end of the signal. The monostable 60 digits and limits the duration of the digits. The im-

Multivibrator MU realizes the circuit RIV ₂ in pulses of the output signal of the monostable multivibrator

F i g. 1. The display elements light up when the stage M ₃ switches the counter C further forward. With

Output signal of the NAND gate / V ₉ the binary E and F are the output signals of the digit counter

has value 1, ie if the potential is shown at any one. With RR ₁ , RR ₂ and RR ₃ the vibrations are

its three inputs has the binary value 0. 65 Forms of transmission of the reset signals of the digit counter

If one bypasses the indicated CN ₁ , CN ₂ , CN ₃ and with CJC ₁ , CK ₂ and CK _{3 the} terminals A, P shown, one actuates those of the incremental signals of the counters.

Permanent illumination of the display elements. When placed open.

For this purpose 3 sheets of drawings

Claims (1)

1 2 Pio invention relates to a circuit arrangement. 1. Circuit arrangement for transmitting the middle control to the Fenwwf ^ RppB · * «dw ge-Nuramer of a calling subscriber from a 5 called subscriber and for making the centrally controlled FernsprecbvermittlungssteUe visible to number on the telephone set of the called telephone set of the called TeUneb- subscriber. mers and to make the number visible at Mit the currently usual Fenwpredwpparaten the telephone of the called TeUneh- a called subscriber can use the rutenoen leu- mers, characterized in that in io takers only identify by dali he <* en Anrut the switching control (CC) answers a facility (Γ /) and verbally requests it, the anruter for conveying the number of the calling person may introduce yourself. Subscriber on the basis of a command signal with the object of the invention is a circuit arrangement the direct current criteria forming the number to indicate the number of the calling 15 subscribers lying within the audio frequency band visually to the called subscriber. Voice frequency modulated and the modulated can be shown, which for various reasons