FI57858B - ANORDING FOR OVER / ELLER FUNCTIONS SUPPLYING SIGNALERS AND INDICATOR RESERVER SHEET PAO BESTAELLARENS TELEFONLINJE OCH / ELLER FUNKTIONSUPPLYSNING - Google Patents

Description

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Styrkt (71) Zellweger Uster AG, CH-8610 Uster, Switzerland-Switzerland (CH) (72) Werner Meyer-Graap, Rapperswil, Switzerland-Switzerland (CH) (7¾) Leitzinger Oy (5M Device for separating and / or generating signals, indicating the reservation status and / or operating information of the subscriber's telephone line - Anordning för & tskiljning och / eller alstring av signaler, som indicerar reserveringsläget p & heställarens telefonlin-je och / eller funktionsupplysning

The invention relates to an apparatus for separating and / or generating signals indicating the charge status and / or operating information of a subscriber's telephone line.

Different conditions exist in the subscriber lines of a telecommunications facility, depending on whether the subscriber line is busy or unoccupied. In the busy state, there is a galvanically closed loop from the telecommunication center to the subscriber and back to the exchange, while in the non-busy state, this loop is open on the subscriber side. The conductors of the subscriber's wire are in an open and closed loop at different potentials. In addition, various signals are present in the subscriber's line, such as, for example, the following operating signals: a selection pulse, a signaling pulse and a charging pulse.

For various purposes, such as to find out about calls and connections on the subscriber's line and related charges, or to monitor the regular operation of telecommunication centers, etc., it is often necessary to separate and / or separate the signals of at least one subscriber line and / or its operation signals, or generates 2,5858 signals indicative of these states or operation signals so as not to interfere with the normal operation of the telecommunication connections.

Since some of said signals differ only slightly in frequency, it is difficult or even impossible to distinguish them by known frequency-selective means.

The object of the invention is to provide an economical, simple and reliable device for generating signals indicating the charge status and / or operating information of a subscriber's telephone line.

To achieve this purpose, the device according to the invention is characterized in that the output of a low-pass filter connected to the subscriber line conductor is connected to a first amplifier, the output of which provides a charge signal to a first group of logic ports each having two inputs. , and wherein the first input of the second amplifier is connected to the second conductor of the subscriber line and the second input is connected to the positive potential, and wherein the first input of the third amplifier is connected to the second conductor of the subscriber line and the second input is connected to the negative potential. the first input and the output of the third amplifier are connected to the second input of the second group of three ports, and that the second group of said three ports the first output is connected via a monostable circuit to the second input of one port of the first port group and the outputs of the second and third ports of the second port group are connected to the first and second inputs of the OR gate, respectively, the output of which is connected to the second and third ports of the first group of three logical gates, said three ports have dialing pulses at the output of the first, signaling signals at the output of the second of said three ports and tax signals at the output of the third of said three ports, and wherein the low pass filter and the first amplifier together form a device for separating the second and second amplifier signals; and the monostable circuit together with the first logical port group 57858 forms the selection of pulses, signaling signals and to separate taxi signals.

In the following, the invention will be described in more detail by way of exemplary embodiments with reference to the accompanying drawings, in which Fig. 1 shows a circuit diagram according to a first exemplary embodiment.

Figure 2 shows the flow of potential at the output of a time-dependent separating element, i.e. a low-pass filter acting as a deceleration circuit, in connection with the first embodiment.

Figure 3 shows a circuit diagram according to a second embodiment.

Figure 4 shows the flow of potential at the output of the time-dependent separating element in connection with the second embodiment.

Before describing embodiments of the invention, some situations in the telephone line of a calling subscriber or a called subscriber are described below. It should be noted in this context that the telecommunication systems used today have a partially different nature. However, the method or apparatus described below for carrying it out can always be applied by a person skilled in the art to the parameters of the system in question.

A) Situations in the case of a calling subscriber AI) Unoccupied: In the case of an open loop, the potential between conductors a and b of the subscriber's telephone line is equal to the smv of the battery.

A2) Horn raised: This is a closed loop = busy, the potential between leads a and b of the subscriber's telephone line decreases to a certain value. Due to the symmetry of the line and the symmetry of the battery voltage input across the supply bridge, the potential change in both conductors is equal and the potential changes in both conductors are in opposite directions.

A3) Dialing: Breaking the loop at the number of twisted numbers 57858 4 dis. causes corresponding voltage fluctuations in the subscriber line between states A1 and A2. These potential fluctuations occur, for example, at a frequency of about 8 to 12 Hz. These are called selection impulses.

AM ·) XCall monitoring signal: The exchange sends audio frequency pulses to the calling subscriber at the frequency MOC Hz and to the rhythm of the ringing signals to the called subscriber.

A5) The called subscriber raises the earpiece: This gives the exchange the first rate pulse to be sent to the calling subscriber. This rate pulse may be a 50 Hz AC pulse applied simultaneously to the subscriber line. However, it can also be, for example, a 12 kHz or 16 kHz pulse applied to the subscriber's line symmetrically with respect to the ground. The duration of such a taxi pulse is, for example, 200 milliseconds.

AG) Call: Speech signals are audio frequencies and act in opposite directions on both conductors a and b.

A7) Ending a call: This happens when the calling subscriber lowers the earpiece. This causes the loop to open, i.e. the wire returns to the unoccupied state AI.

B) Situations in the case of a called subscriber 31) Non-reserved: As in AI.

32) Incoming call: 25 or 50 Hz AC signal between conductors a and b. In this case, depending on the system, the signal may be in either conductor a or b or both conductors.

33) The called subscriber raises the earpiece: As a result, his subscriber line goes to the reserved space, point A2.

BM) Call: point A6.

B5) Ending the call: The called subscriber lowers the earpiece, causing his cord to return to the unoccupied state, point Bl.

Figure 1 shows a circuit diagram according to an embodiment of the invention. Figure 1 shows in simplified form a part of the equipment of a telecommunication center, which can be connected to the subscriber's line for signaling. In addition, the + and - subscriber refer to the plus or minus terminal of the battery used to supply the wire. The subscriber line 7 with its conductors a and b is supplied over the resistors 1 and 2 belonging to the supply bridge, for example over the relay windings and the secondary windings 3 and 4 of the transformers 5 and 6, the relay contacts 8 and 9 being closed from the supply battery. The subscriber's telephone 12 is connected to the subscriber's line 7 via the gate resistors 10 and 11. Its fork contact 13 closes the loop leading to the subscriber when the earpiece is raised, in which case a numbered short dial can be used during dialing in a known manner. loop openings and loop closures.

By turning the relay contact 9, for example, an AC voltage of 25 Hz can be applied from the signal call signal generator 14 to the subscriber line 7. Through the transformers 5 and 6, a switch pulse can be fed from the 50 Hz tax signal generator 16 to the subscriber line 7. Instead of a 50 Hz taxi signal pulse, when the switch 17 is temporarily closed, a taxi pulse is supplied from the 12 kHz taxi signal generator 18 via the transformer 19 to the subscriber line 7. The capacitor 20 then prevents a short circuit in the subscriber line 7 via a secondary winding of the transformer 19.

The conductors a and b of the subscriber line 7 always have different potential values depending on whether the loop for the subscriber's telephone 12 is open or closed. The open loop has a supply battery smv in conductors a and b. With a closed loop, the potential decreases in both conductors as a result of, for example, a voltage drop in the supply bridge, i.e. in the resistors 1 and 2 of the supply bridge and in any other resistors. These potential values and the voltages generated by said generators are present on the connection points 21 and 22 of the subscriber line 7, for example on the main cross-connection rack of the exchange. Said selection pulses, signal ring signals and rate pulses are hereinafter referred to as operating signals.

It is a feature of the present invention that the cost of separating different signals remains particularly low when this separation takes place at different separation means and at different stages.

57858

Since the busy state manifests itself as a long-lasting (i.e., longer than the selection pulses) loop closure, a signal indicating the busy state can first be generated by the time-dependent discriminating element ZT (cf. Fig. 1).

Such a time-dependent separating element ZT can be, for example, an analogous low-pass filter with a sufficiently low cut-off frequency. It is also possible to implement this with a time-dependent separating element having a switching element operating in a binary manner in a known manner, such as a traction and emission-retarded relay, a deceleration element with a tilting stage and the like.

In addition, the following signals are separated due to the subscriber 7 by a logic separating element LT (cf. Fig. 1).

Such a logic separating element LT can consist, for example, of interconnected logic switching elements, whereby on the one hand the type of logic switching elements and on the other hand their connection method utilize the criterion of different connections of these signals to the subscriber line 7, for example symmetry or ground difference, etc.

The supply line 23 conducts the voltage acting on the line b of the subscriber line 7 from the connection point 22 to the input 24 of the low-pass filter 30. The connection can also take place from conductor a or symmetrically from both conductors. The second input 25 of this low-pass filter 30 is at the negative terminal of the supply battery. For example, the low-pass filter 30 includes two cascade-connected RC members with resistors 31 and 32 and capacitors 33 and 34. An amplifier 40 is connected behind the low-pass filter 30 as an analog / digital inverter. The output 35 of the low-pass filter 30 is connected to the input 41 of the amplifier 40, while the second output 36 with the inputs 42 of the amplifier 40 is connected to the negative terminal of the supply battery.

The cut-off frequency of the low-pass filter 30 is selected to be lower than the frequency of the selector pulses, for example 5 Hz. The output 43 of the amplifier 40 thus only has potential changes that occur when the charge status of the subscriber line 7 changes. By means of the time-dependent switching element, i.e. the low-pass filter 30, as well as by means of the amplifier 40, a signal is thus generated at the output 43 of the amplifier 40, which indicates the charge status of the subscriber line 7. '· -' 7 57858

The subscriber line 7 or its connection points 21 and 22 also display the following operating signals: a) symmetrical selection pulses with a frequency of, for example, 8-12 Hz, b) a signaling signal with an alternating voltage frequency of, for example, 25 or 50 Hz between conductors a and b, according to the system, the signal can always occur only in the conductor a or only in the conductor b or both conductors, c) a rate pulse consisting of an alternating voltage with respect to earth, the frequency of which is, for example, 50 Hz.

The signals present at the connection point 21 are fed by a supply conductor 25 to an input 51 of an amplifier 50, the second input 52 of which is connected to the positive terminal of the supply battery. From the output 53 of the amplifier 50 (with respect to the positive terminal of the supply battery) a logic signal 1 is obtained with a negative polarity of the instantaneous voltage at the connection point 21 and an output signal 0 with a positive input voltage or an input voltage 0.

The signals present at the connection point 22 are conducted by a conductor 27 to an input 61 of an amplifier 60, the second input 62 of which is connected to the negative terminal of the supply battery. From the output 63 of the amplifier 60 (with respect to the negative terminal of the supply battery), by positive polarization of the instantaneous value of the voltage at the connection point 22, a logic signal 1 and a negative input voltage or an input voltage 0 give an output signal 0.

Part B of Figure 1 shows the switching means and connections by means of which the logic signals from the outputs 43, 53, 63 of the amplifiers 40, 50, 60 in the logic separator LT are connected by connections of logic switching elements to selection pulses, signaling signals and low frequencies (e.g. 50 Hz). continuous testing of tax pulses.

A logic signal indicating the charge status of the subscriber line appears at the output 43 of the amplifier 40 and is labeled.

In order to take advantage of the different means of connection on the exchange side to the subscriber line 7 for individual operating signals to separate these operating signals, the signals present at the outputs 53 and 63 of the amplifiers 50 and 60 are passed to logic switching elements connected to each other.

The logic signal at the output 53 of the amplifier 50 is applied by a conductor 65 to the input 66 of the OR-NOT component 67, to the input 68 of the AND component 69 and to the inverting input 70 of the next AND-component 71. The signal at the output 63 of the amplifier 60 is further applied to the conductor 72 to the next input 73 of the component 67, to the inverting input 74 of the AND component, and to the next input 75 of the next AND component 71.

The output 76 of the OR-NOT component 67 receives a logic signal 1 only when a logic signal 0 is applied simultaneously to both of its inputs 66 and 73. This occurs when selection pulses are applied to the amplifiers 50 and 60, as well as in an unoccupied state. Instead, simultaneous low frequency (e.g., 50 Hz) tax pulses from the subscriber's line 7 during the busy state are applied to the inputs 66 and 73 of the OR-NO component 67 in phase, as a result of which no logic signal 1 is present at the output 76 of this OR-NO component 67. Thus, such tax pulses cannot bypass the OR-NO component 67 and thus do not occur at the output 76 of the OR-NO component 67.

For example, the logic signals 1 corresponding to the selection pulses present at the output 76 of the OR component 67 are passed over a monostable tilt stage 77 by a conductor 77 'to the input 78 of the AND component 79. A signal indicating the charge status of the subscriber line 7 is applied to the second input 80 of the AND component 79. The AND component 79 is thus only permeable in the reserved state of the subscriber line 7, i.e. when selection pulses can and should occur at all, to the signals 1 present at the input 78. A signal U is thus generated at the output 81 of the AND component 73, which indicates the selection pulses of the subscriber line 7.

At the output 82 of the AND component 69 and at the output 83 of the AND component 71, both the series of signals occurring simultaneously with respect to the ground in conductors a and b and also the series of pulses occurring in only one of these conductions are generated with corresponding logical signals 1.

These logic signals 1 are routed from the output 82 or 83 by a conductor 84 or 85 to the input 86 or '87 of the OR component 88. Thus, only signals present simultaneously with the conductors a and b relative to ground are generated at the output 89 of the TAJ and 57858, or signals occurring only in one of the two conductions, the logic signals 1 into pulse trains. Signals present symmetrically in conductors a and b are omitted. As a result, for example, the selection pulses, due to their symmetry, cannot generate any series of pulses at the output 89, but they do signal call signals and low frequency, simultaneously occurring pulses relative to the ground.

Whether the series of pulses present at output 89 are generated by signal call signals or taxi pulses can be identified by the fact that the signal call signals occur in the subscriber line only in the unoccupied state, whereas the taxpass pulses occur only in the busy state.

The logic signals 1 present at the output 89 are therefore fed by a conductor 90 to the input 91 of the AND component 92 and to the 4-input 93 of the AND component 9. The inverting input 9 5 of the AND component 9 2 and the non-inverting input 96 of the AND component 94 are fed from the output of the amplifier 40 43 a signal indicating the charge status of the subscriber line 7 on the line 97. The AND component 92 is thus switched only to be permeable in the unoccupied state of the subscriber line 7, i.e. only in the state of the line where the signaling signals may occur. The AND component 94, on the other hand, switches only to be permeable in the busy state of the subscriber line 7, i.e. in the state of the line in which the taxi pulses may occur. The output 98 of the AND component 92 therefore has a series of pulses Ur which indicate the signaling signals of the subscriber line 7.

In contrast, the output 99 of the AND component 94 has a series of pulses Ut indicating low frequency (e.g. 50 Hz) tax pulses which occur simultaneously in the subscriber line 7 with respect to the ground.

The separation of the selection pulses, the signaling signals and the taxi pulses by generating said signals Uw, and Ut thus takes place by a suitable connection of the logic switching elements 67, 69, 71, 79, 92 and 94, taking into account the charge of the subscriber line 7, as indicated by the charge signal U. ·

O

57858 10

Figure 1 further shows how, for example, 12 kHz or 16 kHz taxi pulses fed symmetrically to the subscriber line 7 in the exchange can be separated from the subscriber line 7 or its connection points 21 and 22 over a selective filter element 100 and e.g. a rear-mounted amplifier 101 and lead to the terminal 102.

Pulses U f corresponding to said 12 or 15 kHz tax pulses are present at this terminal 102.

In the device according to Figure 1, the low-pass filter 30 is dimensioned so that the signaling signals (usually 25 Hz or 50 Hz) and the tax pulses (12 kHz or 16 kHz, otherwise 50 Hz) are at least so strongly removed that the current switching state of the amplifier output 43 is not affected by this AC signal. .

With the selection pulses, their AC voltage component (about 10 Hz) is also largely removed by the low-pass filter 30. However, the DC potential Ug in the charge state of the capacitor 3U decreases from time t at the start of the selection event during the selection pulses almost exponentially from the value Ug, which averages the DC voltage depending on the ratio of the opening time and closing time of the selection pulse contact device. Compare Figure 2.

Since the potential difference of the DC voltage in the long subscriber line between the busy state and the non-busy state is only a few volts, the potential U in the capacitor 34, especially during higher number dial pulses, can fall below a critical value, preventing the input current required for full control of the amplifier 40. However, a corresponding increase in the time constant of the low-pass filter 30 to avoid this would not be appropriate, as this would greatly delay the operation time of the busy state. It is advantageous for the use of the device that this operating delay does not. would be greater than, for example, 200 to 300 milliseconds, because, for example, within this time, it must be ensured that the selection pulse receiver opens with a charge signal so that it can receive the selection pulses following the charge.

The non-critical operation of the device is guaranteed in the second embodiment of the invention according to Fig. 3. In Fig. 3, the corresponding parts are indicated by the corresponding reference numerals 1-102.

57858

The series of pulses Uw present at the output 81, corresponding to the selection pulses of the subscriber line 7, are fed back by a conductor 103 and a diode 104 of such a degree and strength to the output 35 of the low-pass filter 30 so that the average of the DC potential U is , as shown in Fig. H in the interval t -t ^. The charge of the capacitor 3H over the diode 10H is thus renewed during each selection pulse so that the input current required to control the amplifier HO is maintained.

In practice, however, in addition to the situations described in the above-mentioned sections A1 ... A7 or B1 ... B5, a number of other operating signals and, above all, various disturbance signals may occur in the subscriber's management, the occurrence of which is undesirable. Therefore, it may always be necessary, depending on the requirements of use, to provide the subscriber line in question with suitable additional means to exclude such unwanted signals. Such exclusion can be provided, for example, by known means in the analog part of the above switching example, such as zener diodes and the like, by removing switches below the signal level of the received operating signals or also by removing higher frequencies above the useful signals at the input frequency amplifiers. Sufficient removal of unwanted signals can also be achieved in a manner known in the binary part of the above coupling example, for example by locating deceleration means and tilt stages for separating signals below or above a certain time duration. Furthermore, the hysteresis of the Schmitt trigger, for example, can be used in a known manner to remove interference signals.

Claims (5)

1. Device for separating and / or generating signals indicating the reservation position on the customer's telephone line and / or other functional information, characterized in that the output of a low pass filter (ZT) connected to the line in the customer's line (7) is connected to a first amplifier. (40), whose output (43) outputs a reservation mode indicating signal (Ufa) to a first group of logic gates (79, 92, 94), each having two inputs, one of which is to the one reservation mode signal (U ) is measured from the output of the first amplifier, and wherein the first input (51) of the second amplifier (50) is connected to the second line (a) <of the customer line (7) and the second input (52) is connected to positive potential (+) and wherein the first input (61) of the third amplifier (60) is connected to the second line (b) of the customer line (7) and the second input (62) is connected to negative potential (-), while the output of the second amplifier (50) (53) is connected to the first input (66, 68, 70) of a second group consisting of three ports (67, 69, 71) and the output (63) of the third amplifier (60) is connected to the second input (73, 74, 75) of the second group consisting of three ports (67, 69, 71), and that of said three ports (67, 69, 71) in the second group, the output (76) of the first port (67) is by means of a monostable circuit. (77) connected to the second input (78) of a port (79) of the first port group and the outputs of the second and third ports of the second port group are connected in a corresponding manner to the first and second inputs of the OR port (88) , whose output (89) is connected to the second input (91, 93) of the second (92) and third (94) port of the first group consisting of three logical ports (79, 92, 94), wherein the aforementioned the three ports of the first port's output (81) emit wire or number disk pulses (U), of the W mentioned ports, the second port's output (98) emits call signals (Ur) and of the said three ports the output (99) of the third port emits charge signals (Out), and the low pass filter (ZT) and the first amplifier (40) constitute a device for separating the reserve position signal, and that the second and third amplifiers (50, 60) together with the second gate group (67, 69, 71) and the monostable circuit (77) together with the first logical gate group (79, 92, 94) constitute a device for separating whorls (U), call signals (Ur) and charge signals (Ufc) , which appears on the client line. 5 7 8 5 8 16 2. Device according to claim 1, characterized in that the low-pass filter (ZT) constitutes a delay circuit, so in a delayed manner repeats both change of its input signal from torque value 0 to a predetermined value and change of the input signal from its predetermined value to 0. . Device according to Claim 1, characterized in that said device for separating the pulse (U val), the call pulses (Ur) and the charge signals (Out) is a logical isolation means (LT) which comprises said first group of logic gates (79, 92, 94) and further said second group of logic gates (67, 69, 71), said second group of logic gates having an OR NOT gate (67,), a first AND gate ( 69) and a second AND gate (71), the input (66) of the OR gate (67), the input (68) of the first AND gate (69) and the inverting input of the second AND gate (71) ( 70) are connected to the output (53) of the second amplifier (50), the second input (73) of the OR gate (67) and the inverting input (74) of the first AND gate (69) and the second AND gate (71) second inputs (75) are connected to the output (63) of the third amplifier (60), and the output (76) of the OR gate (67) is connected to a monostable circuit (77). the input (78) of the first AND gate (79) in the first three port (79, 92, 94) group, the first AND gate (69) of the second group of logic gates (67, 69, 71) the output (82) is connected to the first input (86) of the OR gate (88) and the output (83) of the second AND (gate) of the second group (67, 69, 71) is connected to the OR gate (88) second input (87), while the output (89) of the OR gate (88) is connected to the second input of the second (92, 94) and third (94) first gate of the logical gate group (79, 92, 94) and said three logical the second input of the ports (80, 91, 96) is connected to the point (43) on which the reservation position signal (U +) is located. 4. Device according to claim 3, characterized by voltage feedback (Figs. 3; 81, 103, 104, 35) of at least one output signal (U, U, U.) from the logic etching separator (LT) W in L to the one-pass filter (ZT) output (35). Device according to claim 4, characterized in that the feedback circuit (81, 103, 104, 35) is arranged from the first output (81) of three gate circuits to the low-pass filter (ZT).