DE1075677B - Circuit arrangement for the transmission of zone identification pulses for the recording of charges in semi-automatic telephone traffic - Google Patents

Description

GERMAN

The invention relates to a circuit arrangement for the transmission of zone identification pulses for billing in semi-automatic telephone traffic, where the remote station is at the end a cordoned off line with 50 Hz or audio frequency dialing transmissions.

The switching of long-distance telephony can be done in several ways. With the first procedure the calling subscriber orders his conversation at the reporting point for long-distance calls, and the long-distance officer mediates the conversation by calling the calling and called subscriber herself, connects both participants with each other and all on a memo card for billing the call enters the necessary information. With the second method, the so-called express traffic, the Participant to the remote officer, who will put him through the connection without delay. But she has to Identify the calling party, who pays for the call, in order to verify the accuracy of his information to make sure and to be able to settle the call. In the direct dialing service where the Call charges are automatically determined by means of the time zone counter, are those of the transmission for Time zone counting the counting pulses sent back to the calling subscriber directly in the counter of the calling party registered.

The time zone counting can also be used to advantage for the recording of charges in the case of remote election of female officers. Known such solutions, as indicated for example in FIGS. 1 and 2, have disadvantages, however, because the counting pulses sent out by the tariff transmission TU (FIG. 1), in which the corresponding zone is set by the operator, have to be retransmitted via lines , in which there are transmissions for a 50 Hz selection (Fig. 1) or TfW tone frequency selection (Fig. 2). In the first case the transmission for the 50 Hz dialing is considerably more complicated and expensive, in the second case this method cannot be used at all, because the retransmission of the counting pulses during the conversation via the transmissions for the audio frequency dialing with regard to the current solution of Single-frequency dial-up transmissions is hardly feasible. During the call, the audio frequency transmission must be insensitive for all impulses with the exception of the signals "the called party is on" and the trigger signals. The transmission of the counting impulses during the conversation via the tone frequency transmission would disrupt the conversation and could therefore only be implemented via special signal lines, which contradicts the recommendations of the CCIF. In addition, the sound circuitry would be used for transmission
of zone identification pulses

for billing
in semi-automatic telephone traffic

Applicant:
TESLA ₁ narodni podnik, Prague-Hloubetin

Representative: Dipl.-Ing. A. Spreer, patent attorney,
Göttingen, Groner Str. 37

Miroslav Novotny, Prague,
has been named as the inventor

Frequency selection transmissions and all cooperating devices complicated and expensive will.

By the circuit arrangement for billing in semi-automatic telephone traffic According to the invention, the described disadvantages of the known circuits are to be eliminated.

The essence of the circuit according to the invention is that a relay set connected at the beginning of the line picks up the zone identification pulses to be sent out from the remote place against the direction of the connection establishment before the called subscriber is reported and that this relay set, after the called subscriber has reported, a known manner through the zone identification pulses defined number of counting impulses per time unit during the conversation to /. GW broadcasts.

In Fig. 3 is the block diagram of an embodiment of the circuit arrangement according to the invention and in Fig. 4 shows the basic circuit diagram of the relay sets for special technical conditions.

In the block diagram of FIG. 3, the remote station is at the end, a line in which 50 Hz dial-up transmissions (50 Hz) and audio frequency dial-up transmissions (TfW) are interposed. The officer at Fernplatz determines the zone value of the connection to be established by the fact that she, for. B. by pressing the associated button, before reporting the called subscriber, the sending of zone identification

909 730/119

1 U75 677

initiation impulses to the relay set DU of the service transmission against the direction of the connection establishment. The number of zone identification pulses is graded according to the value of the zone. The zone identification pulses are recorded in the relay set DU . Of the continuously running counting pulse sources, not shown in the figure, common to a group of relay sets DU , each of which generates counting pulses in a different regular rhythm, ie with a different frequency, the counting pulse source corresponding to the received number of zone identification pulses is sent from the relay set DU to the The line leading to the calling subscriber is connected as soon as the call is recorded by the called subscriber.

The counting pulses are transmitted in the usual way via the LGW to the call counter of the calling subscriber. For expensive conversation time units, ie more distant zones, the counting pulse frequency is higher. The total charge determined by the number of counting pulses received in the call counter is therefore based on the counting pulse source connected in the relay set DU and on the duration of the call, the counting being completely automatic. As already mentioned, the officer at the remote station only initiates the activation of the corresponding counting pulse source.

This has the advantage that, for. B. in high-speed traffic, where the remote place with cordless central switch is equipped, the connection can be triggered automatically after the end of the call. It should also be emphasized that the time span of the performed keying of the called number by means of the push-button number transmitter of the remote station to is used to report the called subscriber and other advantages are known per se Conversation counting during the conversation.

The main advantage of the invention, however, is that interference-free transmission via sealed off Lines and, above all, lines with intermediate 50 Hz or tone frequency dialing transmissions is guaranteed, since the zone identification impulses before the called subscriber is reported be sent, so that the difficulties mentioned in the introduction to known circuit arrangements are avoided will.

It is clear that the required number of zone identification pulses can easily be transmitted as a series of pulses to a setting element in the relay set DU. However, there are also cases in which only one pulse can be sent over the long-distance line between remote station and relay set DU , whereupon the devices in the line must be returned to their original state by a pulse (reset pulse) running forward in the establishment direction of the connection . In this case, too, the circuit arrangement according to the invention comes into play, the relay set DU in the service transmission and a relay set in the remote station being able to be arranged according to the circuit diagram in FIG. 4. If the officer presses the key corresponding to the required zone, the interplay of the relay sets is started, so that zone identification pulses alternate in the reverse direction and reset pulses in the forward direction, until m _{t by means of the contact}

the corresponding number of pulses has been counted. The switching device through which the preparation of the selective connection of a specific one of the counting pulse sources to the counting circuit for the calling subscriber is carried out is located in the circuit of the contact p ₂ actuated according to the zone identification pulses. The circuits are discussed with reference to FIG.

This shows schematically the switching principle according to

ίο the invention in a service transmission DU and at a remote place with a two-wire connection. The circuit for a four-wire connection at the trunk end is similar, but the criteria at the remote site are then the transmissions for the

TfW adjusted audio frequency selection. As soon as the remote officer has initiated the transmission of a number of pulses corresponding to the desired zone by pressing a button, the relay M speaks via contact ν in the circuit

1. Negative pole, winding of relay M ₁ contact η of relay N, contact a _t of relay A, contact v, earth

at,

The relay M applies a negative potential to the α-wire by means of its contact m ₂ and via the winding of the relay A. The high-resistance relay X in the transmission DU speaks thereby in the circuit

2. Minus, relay ^ ? _{, contact W 2} , α-wire, contact «(which is closed because the transmission DU is ready to receive), winding of relay X ₁ contact 0 of the actuated relay O ₁ earth

at.
The relay P speaks in the circuit

3. Minus, relay P, contact χ of relay X, earth

at. Through its contact P ₁ , the relay P interrupts the circuit of the relay O, which drops out after a delay and applies earth to the α-wire. This potential is then passed on to the remote station via the transmissions DU as a reset pulse. At the remote place, relay A speaks in the circuit

4. Minus, relay A, contact m ₂ of relay M ₁
α-wire, U, p ₃ and o-contact, earth

at.

The relay M drops out because the contact a _{t of} the relay A interrupts the circuit 1; the relay ^ remains in the circuit 4 via its own contact a _2. The relay N speaks in the circuit

5. Minus, relay N, contact O ₁ of relay A ₁ contact V ₁ earth

at.

In the meantime, in the transmission DU, the relay P transfers the first pulse to a counter clock generator via its contact p _2. This is not shown. Relay X drops out because contact 0 of relay O has interrupted circuit 2. When relay X drops out, circuit 3 is interrupted. The relay P drops out and its contact P ₁ closes the circuit

6. Minus, relay O, contact p _v earth

of relay Q again.

After the relay P drops out, the contact p _s interrupts the circuit 2 for the relay A and terminates the reset pulse sent in the connection direction. The relay A in the remote place drops out and

1 U / O Ό / /

closes circuit 1 again. The process described is then repeated. The contact Wi _{1 of} the relay M in the remote station controls the number of zone impulses sent, and as soon as the number of impulses reaches the value given by the zone determined by the officer on the button, the zone impulses are interrupted. In the transmission DU , the zone pulses are transmitted via the contact p ₂ to a counter clock generator, not shown.

Claims (3)

Patent claims: 1.Circuit arrangement for the transmission of zone identification pulses for the recording of charges in semi-automatic telephone traffic, in which the remote place is at the end of a cordoned off and with 50 Hz or audio frequency selection transmissions provided long-distance line, characterized in that a relay set connected at the beginning of this line (DU in Fig. 3 and 4) picks up the zone identification pulses to be sent out from the remote station against the direction of the connection establishment before the called subscriber is reported and that this relay set (DU) after the called subscriber has been reported takers in a known manner a fixed by the zone identification pulses number of counting pulses per unit of time during the conversation to /. GW broadcasts. 2. Circuit arrangement according to claim 1, characterized in that in the relay set (DU) a relay (X) for receiving the zone identification pulses and a contact (^ ₃ ) of a relay (P) for sending reset pulses and in the relay set of the remote place a relay (A) for the reception of the reset pulses and a contact (m ₂ ) of a relay (M) are connected for the transmission of the zone identification pulses and that the relay set (D U) emits a reset pulse in the connection direction after each reception of a zone identification pulse. 3. Circuit arrangement according to claim 1 and 2, characterized in that the zone identification pulses have pulse shape only in the sections with long-distance transmissions (50-HZ and TfW transmission in Fig. 3). Considered publications:
German Patent No. 644 276;
Siemens magazine, 1952, issue 3, pp. 3 to 7. 1 sheet of drawings