DK141268B - PHONE CONNECTOR CONNECTOR WITH FREQUENCY OR TIME MULTIPLE TRANSFER SECTION - Google Patents

Description

(11) PUBLICATION WRITING 1 4 1 268 DENMARK <«> '" * ci. = Ho * ii / n • (21) Application No. 115 ^ / 77 (22) Filed on 15 · mST. 1977 (23) Race Train 15 · Π18Γ · 1977 (44) The application presented and

the subpoena published on '' 1 ^ OU

Dl REPORTORATE OF __ PATENT AND TRADEMARKET (30) Priority requested from the

Mar 16 1976, 2611066, DE

(71) SIEMENS SHARE COMPANY, Berlin and Munich, 8 Munich 2, Wittels * 8 TJacherplatz 2, DE.

(72) Inventor: Johann _Sontheim, Alpspitzstrasse 14, 8155 Peldafing, DE.

(74) Plenipotentiary in the proceedings:

International Patent Office. __ (64) Telephone subscriber connection system with frequency or time multiplex ** transmission section.

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a connection system between a telephone subscriber and an intermediary site, in which a two-wire subscriber connection line includes a four-wire section associated with each signal direction which extends over a frequency or time multiplex transmission system, signal channel, and in which on the subscriber side two-wire four-wire junction there is a loop establishment receiver for transmitting loop establishment signals from the subscriber side to an outgoing signal chore, a cold generator for supplying call signals and a counter subscriber for feeding counter counter.

In a telephone switching network, remote telephone subscriptions must be connected to the following switching location over a frequency or time multiplexing system when the otherwise usual connection technique is not suitable due to excessive distances or inaccessible terrain, e.g. mountains or water.

In this case, too, when the subscriber requests it, a numeric character must be transmitted to it so that, at the subscriber location, for example, by long-distance calling, the fee which can be charged at any time can be immediately determined. However, the signals transmitted thereto towards the subscriber over the frequency or time multiplex system must be clearly distinguishable from call signals at the two-wire transition on the subscriber side. Such separation could easily be achieved by attaching a separate signal channel to each of the two signal types for transmission over the frequency or time multiplex system. However, this would require such a high supply in such a system that the subscriber connection system is assumed to be uneconomical.

The invention therefore aims to design a connection system of the type mentioned initially so that in each transmission direction only one single signal channel is required for each infontiation channel and thus also only one signal core in the four-wire section, without the unambiguous and simple separation of the the direction of the subscriber transmitted call and count signals at two-wire four-wire transition on the subscriber side is thereby made more difficult.

According to the invention, this task is solved by the loop establishment receiver, the arriving signal chore, the call generator and the count sign transmitter being so logically linked that a signal from the loop establishment receiver and a signal appearing on the signal cores together causes the activation of the count sign transmitter and the missing signal transmitter, whereas signal appearing on the signal core causes activation of the cold generator.

Advantageously, in this arrangement of the subscriber interconnection system, the counting and calling signals arriving on a signal core are distinguished by the signals appearing during loop establishment on the subscriber side as counters, and the signals occurring in the open subscriber two-wire loop are rated as call signals.

An embodiment of the invention is characterized in that the loop establishment receiver is connected over one delay link to one input of a first AND coupling, the second input of which is connected to the signal choir and whose output is connected to the count sign transmitter, and over the delay link and a negative link with it. one input of one and another coupling to which the second input is connected to the signal choir and to whose output a coupler is connected for switching on or off the cold generator.

Advantageously, the delay means ensures that a signal appearing on the signal choir that appears shortly after the opening of the subscriber-wire loop at the end of a call is also transmitted to the subscriber as a count character.

Finally, the count character transmitter may be connected to the subscriber-side branch of the four-wire line.

Hereby, the advantage is obtained that no special measures are required to prevent the ingress of 16kHz counting signals into the outgoing four-wire branch on the subscriber side, which would be required if the counting signer was connected to the two-wire line on the subscriber side, since the fork coupling in the two-wire four-wire at a time, the counting signal vapors are sufficiently damped.

The invention will be explained in more detail below with reference to an exemplary embodiment shown in the drawing.

The device shown schematically in the figure is divided into four sections in a total of five sections through vertically extending lines, such parts which are not necessary for immediate understanding of the invention are omitted. One of these, the middle section 1, symbolizes a frequency or time multiplexing system over which a subscriber station 2 is connected to a switching location 3, which is characteristic of voters 4. Subscriber station 2 and switching location 3 are connected by terminal equipment 5 and 6 respectively. to the frequency or time multiplex system 1. The frequency or time multiplex system may e.g. be a carrier frequency transmission system with information channels 7 extending over radio chains, which system e.g. a subscriber station 2 on a drilling platform having an onshore switching location 3. The two-wire subscriber connection line 8a, 8b extending between subscriber station 2 and switching location 3 is connected to two two-wire four-wire junctions 9 for the purpose of introducing the low-frequency system into the subscriber connection line.

A call originating from the subscriber station 2 is communicated to the switching location 3 by establishing the two-wire loop 8a on the subscriber side. The establishment of the loop is recorded by a loop establishment receiver 10, which is constantly connected to the subscriber connection line 8a, and causes over a relay 11, or a corresponding electronic device, and a contact 4 controlled by the relay 11, that a potential change occurs on a signal cor 13, which is associated with the four-wire section extending between the fork couplings 9. This potential change is transmitted over a signal channel 14 located in the low frequency system which corresponds to this signal core and activates a relay 15 in the terminal equipment 6 for the switching location 3. The relay 15 terminates a contact 16 and thus establishes the two-wire loop 8b on the switching side. This selects the selector 4 on the mediation side. In the event of a brief interruption of the two-wire loop 8a, selective pulses transmitted from the subscriber station 2 are similarly transmitted.

A call to be signaled from the switching location to the subscriber station 2, at opened contact 16, activates a call signal receiver 17 which is connected to the two-wire line 8b on the switching side. The call signal receiver 17 terminates over a relay 18 a contact 19 and thus in the same way as the contact 12 causes a potential change over the signal cores coming to the subscriber station 2 20. The signal produced through this potential change over the signal core 20 reaches both a gate circuit 21 and a gate circuit. 22, which is connected to the signal choir 20. At unoccupied subscriber station 2, that is, at interrupted two-wire loop 8a on the subscriber side, no signal appears on a line 23 connecting the output of a loop establishment receiver 10 over a delay line 24 to the additional two inputs. to the gate circuits 21 and -22. However, since the input to receiver loop 10 connected to the gate circuit 21 is designed as inverting input, the input conditions necessary for an output signal from the gate circuit 21 are met and a relay 25 terminates over its contact 26 a call signal generator not shown to the two-wire loop 8a on the subscriber side. If loop establishment is provided by lifting the tube at the subscriber station 2, the loop establishment receiver 10 produces an output signal which connects over the relay 11, switch 12, signal choir 13 and relay 15, and switch 16 to the two-wire loop 8b. In addition, however, the output of the loop establishment receiver 10 also reaches over the line 23 and the delay line 24 to the gate circuit 21, whereby the connection of the code generator to the two-wire loop 8a and thus the transmission of a further call to the subscriber is terminated after the expiry of the delay time 24 determined. At the same time, the output of the loop establishment receiver 10 over the line 23 and the delay line 24 also reaches the gate circuit 22, 141268 5, which, however, has no further consequences since the relay 15 is activated after the expiry of the delay time and as the further transmission of signals over the choir 20 thus terminates. and the switch 19 is again in the resting position.

During a conversation that is conducted over a connection established from the subscriber station 2, counting characters also reach the intermediary location 3, and must be passed from there to the subscriber station 2.

For receiving the count characters formed by sensing an alternating current of 16 kHz, there is in the terminal equipment 6 on the transmission side a number sign receiver 27 which, in parallel with the call signal receiver 17, affects a relay 18 when a count sign is received.

As a result, a switch 19 is terminated at each counting sign and now a signal is also applied to the second input of the gate circuit 22.

However, this means that each closure of the switch 19 upon the establishment of the two-wire loop 8a on the subscriber side and after the expiry of the delay time determined by the delay line 24 is utilized such that a counting sign transmitter 29 connected to the arriving four-wire branch 28 leads over the fork coupling 9 on the subscriber side. a counter character to the two-wire loop 8a on the subscriber side.

A fee counter 30 connected to the subscriber station 2 of the two-wire loop 8a is controlled by these counting characters and makes it possible to determine the total text fees at any time.

In order to transmit the call signals and counting signals in the direction of the subscriber station 2, only a signal chore 20 and thus also only a signal channel 31 associated with the information channel 7 is needed, and in the terminal equipment on the subscriber side, reliable signals between the signal chore 20 and counting characters are distinguished reliably because before loop loops. 8a, incoming signals over the signal choke 20 are only judged as call signals and after the loop establishment and the expiration of the delays occurring through the delay line 24 is only counted as counting characters. This provides a particularly simple structure for the subscriber connection system.