DE2915452C2 - Circuit arrangement for the transmission and evaluation of dialing information consisting of individual dialing codes in switching systems, especially telephone switching systems - Google Patents

Description

a) for the evaluation of a signal emitted by the end device for the start of the dialing number,

b) for sending signals that are compared with the dialing signals entered in the terminal should be

c) for the evaluation of a signal sent by the terminal for the end of the dialing code after the agreement of the Signals sent by the exchange with the dialing code entered in the terminal,

characterized in that a known binary-controlled electronic in the terminal Comparator is provided, which the dialing code corresponding to the respective keystroke with the data from the exchange within the tasin operating time via a device arranged in the terminal also known series-parallel converter in parallel form converted signals compares and, if a match is found, the dialing code end signal to the exchange sends.

2. Circuit arrangement according to claim 1, characterized in that binary electronic means (z. B. BC, F i g. 3) for storing the dialing codes entered with the keys are arranged in the terminal, which come into the working position immediately with the key contact closure "Means are also provided in the terminal which, after evaluating each dialing code, switch the binary electronic storage means back to the starting position.

3. A circuit arrangement according to claim 1, characterized in that a different number of periods of an alternating current are provided for the signals sent by the exchange, this number of periods is assigned a tolerance on the sending and receiving side (z. B. digit 1 = 10 periods plus / minus 2 periods), means are provided in the terminal ( Fig. 9, S), which adapt the alternating current periods for controlling the binary-controlled electronic means.

4. Circuit arrangement according to claims 1 to 3, characterized in that the same electrical values are provided for the coding of the dialing codes in the terminal (e.g. Fig. 1, Ti + 5 V. NA 2- T2 + 5 V. NA 3- .. .).

a) for the evaluation of a signal emitted by the end device for the start of the dialing number,

b) for sending signals that are compared with the dialing signals entered in the terminal should,

c) for the evaluation of a signal sent by the terminal for the end of the dialing code after it has been determined that the signals sent by the exchange match your im Dialing code entered on the terminal device.

Circuit arrangement for transmission and evaluation Such circuit arrangements are already known, which is best from individual dialing codes. This is how the impulse dialing process uses the dial to transmit impulses directly made to a central exchange. The transmission using the rotary dial takes up to one second per digit. Apart from the loss of time, mistakes can easily occur in the choice. the Occupancy of the central facilities is quite large in relation to the occupancy. Distortions can occur both through the rotary dial and on the transmission path, so that the selection is also possible is affected.

Furthermore, a multi-frequency code dialing method is known in which 8 frequencies for coding the Elective criteria are required. The effort for this is considerably.

With the diode- earth method, direct current circuits are formed by means of rectifiers via the n / b wires of the subscriber loop and with the help of an earth on the push-button telephone set. The direct current circuits in connection with the current directions then result in the code. In the switching center, the evaluation is carried out by means of a relay in two work steps by switching the power supply. Both the procurement of the earth for the touch dialing device and the necessary 4 relays in the evaluation device mean a great deal of effort.

Furthermore, an automatic switching device for telecommunication systems is known in the case of all Subscriber sets must have alternating currents of different frequencies available. Are there for the production of connections running over several elective levels, frequencies and resonance elements required as a means of reception in the elective levels. A certain number of resonance elements is always closed summarized in a voting unit. These dialing units are multiple-switched with further units by Filters of the same frequency are in parallel on common lines and the latter in turn provides the input to form a unit of the next electoral level. A disadvantage of this circuit arrangement is that for each label requires an alternating current.

this results in a considerable effort for the part and in the exchange.

In all arrangements in which the entries of the Dialing information is given by means of buttons, are set to these time conditions, such as /. B. the button action

b5 duration, the key pause, the key change /. time. which have a detrimental effect on the price of such tactile dialing apparatus.
Furthermore, a circuit arrangement (DK-AS

1115 772) known for devices for button-controlled dialing, in which the dialing information by means of Voltage-dependent elements, such as counting chokes, are temporarily stored in which the different influenced memory elements at the subscriber station lie while the evaluation device is arranged in the office, while the storage circuit runs as well as the evaluation circuit via the wires of the slave connection cable.

A disadvantage of this arrangement is that the evaluation or comparison can only take place after the key has been pressed, so that direct touch selection is not possible for time reasons Counting throttle of di / di, i.e. dependent on the Sirom change in the unit of time, and the capacity of the line also depends on its length. The inductances in the exchange are also an obstacle with regard to a rapid change in current, as a result of which rapid impulses are prevented.

The object of the present invention is now to create a circuit arrangement which has the aforementioned Avoids disadvantages and offers greater security of dialing number transmission material and maintenance costs can be reduced. This is disclosed in claim 1 Teaching achieved

A particular advantage of the invention is that when using binary storage means, not only the Key action time, but also the key envelope when the key is released and a part of the Task pause can be provided for the transmission. In addition, it does not make bruises effective.

The invention will now be explained in more detail with reference to the drawings. In FIG. 1 the terminal is a telephone set. HU is the hook toggle switch, W is the alarm clock, r is a toggle switch that flips over first with every key press. Shift time approx. 5 ms. The speech sentence Sp is therefore switched off while the key is pressed. With the r-contact an optocoupler OK 1 is switched on. A part of the central evaluation device, which is explained with the functional description, is shown in the exchange. Wi "d the handset removed, the operating side closes by HU. About Sp the direct current loop is closed to the switching center. To select recording is switched to the switching center on a central ejector. Each press is opened with r the direct current loop first (during the turn-around time), and then closed again via the optocoupler OK 1 again. in the example, this Stromünderung caused through the loop interruption of the r-Konlaktes supplied to the evaluation device of the exchange with the help of the transformer U. Ü 1, 2, the transformer windings in the Teilnchmerschleife and Ü3 the winding In the circuit of the winding Ü3 , the relays B and M are connected via rectifiers of opposite polarity. When the DC loop is opened, the relay M is activated. so becomes through this en induction shock brought relay d. - Instead of the relays in the secondary circuit B and M , electronic switching elements such as optocouplers etc. can also be provided. - 26 contact closes a pulse circuit every 3 ms. / Relay responds every 3 ms. With the contacts of the M and B relays not shown, a relay M 1 (not shown) has picked up. At the 1 and 5m 1, the subscriber loop switch to the pulse circuit. The resistance Wi with 3 / is short-circuited so 'that changes at the 3-ms-rhythm of the current in the subscriber loop. The optocoupler OK 1 in the telephone set, this current changes evaluates, and only the power increases, and outputs it as a 5-V ImpuIse to the counting member CGU on. with each pulse, the counter section to the next output is switched from output 0 to output 1, the counting member CGU has already which was created with the pulse through the loop closure on the working side of the r-contact, connected to the outputs of the Counting elements are connected to NAND gates. The other input of the NAND gate is controlled by the respective key. If there is coincidence at the NAND gate, the number of pulses sent by the exchange is equal to the pulse, f:> number assigned to the key , which is connected to this gate, e.g. 1 pulse is marked with the Ti key When switching over to the pulse circuit with r , the counter was, as already mentioned, from output 0 switched to output 1. With the 1st loop pulse 3 / the counter ZGE is switched to output 2. The mode of operation of the gate pyramid is as follows. If there is no coincidence at any of the NAND gates, then all outputs are +5 V, aiso "high" h. At the inputs of the NAND gates 14 to 20NA there is then +5 V. At the outputs of the same there is then approx. 0 V, "low" /. At the inputs of the NOR gates 21 to 2ANO there are then 0 V, and at their outputs +5 V. At the inputs of the NAND gates 25 and 26Λ / Λ there are then + 5V and at their outputs OV. There is then 0 V at the input of the gate NO 27 and + 5V at the output. A relay is then switched via further gates. If the output of the gate NO 37 is OV, relay Γ can respond. It is assumed that the Ti key is pressed and that 1 pulse is assigned to it. If the 1st pulse is then sent by the exchange, it is sent to the ZGE counter via OK 1. This switches to output 2. Output 2 leads to gate NA 2. The working side of key contact Ti also goes to the other input of gate NA 2. There is then coincidence. At the input of NA 15 there is then 1 / h and at the output h, + 5 V. At the output of NA 14 there is then "I". At the output of NA 21 there is also “I” and at the output of NO22 there is “h”. At the output of NA 25 there is then “h” and at the output of NA 26 there is then “/ it. At the output of NO 27 there is then “ I ”, so that the relay T now comes to /-.nk.ug. 6f opens the subscriber loop. This interruption is evaluated in the exchange with OK 2 - sin relays: can also be provided for this. Γ-relay is a bistable mini-relay. If the key goes back to the starting position, the counter-winding of the T-relay in the speech circuit becomes effective, so that it is brought back to the starting position. The number of transmitted pulses was also stored in the exchange. The loop interruption was aas Criterion for the end of the dialing code (acknowledgment signal) In the same way, c * ^: .e entire call number is sent.

With the 9th pulse, the counter is switched to output 0. The gate NA 0 with 3 inputs is at this output. The first input is at output 0 of the counter ZGE, the second input is the button 7 "9 and on

the 3rd input is output 1 of the tens / counter element ZGZ . After one pass of the Einerzählgliedes CGU also ten Tell member ZGZ receives a pulse, so that it is switched to the I.Ausgang. If all 3 inputs coincide, the relay T comes, with this, as already described, the acknowledgment signal is sent. The special keys are coded with 11 and 12 pulses. The gates NA 11 and NA 12 are provided for this purpose. The coding keys Γ9, TiO, Γ11 and Γ12 are connected to gates with 3 inputs. If, for whatever reason, 13 pulses are received and passed on to the counting elements, the T-relay responds via NA 13. The gate NA 13 is connected in exactly the same way as Γ9. only the key input is not necessary.

A relay can also be used to monitor the loop in the exchange. Instead of the transformer U , as shown in FIG. 5, a relay ER is arranged in the loop. Relays can also be provided for pulse evaluation in the end device and for the acknowledgment signal. In Fig. Such an example is shown in FIG. O-Rclais in the terminal picks up the pulses and controls the counter ZGE of Fig. 1. The relay OZ in the exchange has the task of evaluating the acknowledgment signal. The criterion for this is / -contact at rest, r-contact open.

Very high demands are placed on the button contacts; they should not bounce, time conditions / i.> Must still be met, e.g. B. the key duration, jo the key pause, the turnaround time. These conditions can be met if you have an electronic memory member, such. B. provides a bistable electronic member. In Fig. 1, such a key would be provided between the key and the respective NAND gate. In Fig. 3 is such a bistable element BG and is fed to the NAND gates NA 1 and NA 2. The counter output from ZGEE2 is then fed to gate NA 1 and the counter output from ZGZZ I is then fed to gate NA 2 . The outputs of these two gates are then fed to the NOR gate NO }. The output of the gate NO IX would then be switched to A ″ of the gate pyramid in FIG.

In Fig. 1, the 3 ms clock can either be individual or in a known manner on the principle of the / right Insert can be generated. The circuit arrangement can of course also be provided for pulse selection will. In the telephone set, the respective final lift point of the number disc must then be mechanical be marked.

The power supply to the electronics can take place in a known manner via the loop.

1 sheet of drawings

like it. When the button is pressed, the output from OVoIt is switched to + 5VoIt. R is the reset circuit. The pulses sent by the exchange can also be evaluated inductively in the terminal, as shown in FIG. Due to the rectifier on the secondary side of the transformer, only the beginning or the end of the pulse is evaluated.

A very simple coding of the dialing codes is if one takes the number of periods of an audio frequency alternating current. It is then useful to assign tolerances to the number of periods. A basic evaluation of the periods in the terminal is shown in FIG. 9. A capacitor C and a transformer U are connected in series with the r normally open contact. An amplifier V is switched on in the secondary circuit, and a half-wave of the Period is converted into a pulse with which the counter ZG is then controlled.If, for example, 3 periods are assigned to each code digit, 3 NAND gates, for example, are assigned to each key and each 3-digit code, as in F i 8. The advantage of tolerances can be seen in the fact that timely use is not required in the exchange.

In Fig. 1 NAND gates are shown with 3 inputs. Those with 4 entrances are offered. The unused input must then with z. B. can be connected in parallel to the key input. However, should only standard NAND gates with 2 inputs are provided a circuit according to FIG. 6 required. Using the example of key coding 7 "11 this should be explained. The key contact TIl

Claims (1)

Patent claims: 1. Circuit arrangement for the transmission and evaluation of one of the individual dialing codes existing dialing information in switching systems, in particular telephone switching systems from a terminal, preferably from a keypad via a two-wire connection line to the exchange with resources in the exchange existing dialing information in switching systems, in particular telephone switching systems from one Terminal preferably from a keypad via a two-wire connection line to the exchange with Mittein in the exchange