DE452350C - Arrangement for telephone lines with several intermediate points - Google Patents

Description

452850

The invention relates to telephone lines to which several intermediate points and at their ends full or semi-automatic telephone exchanges for further connection can be connected to other lines, such as B. in railway operations for so-called district lines are common.

Facilities for different call signaling have already been created been to the intermediate stations by means of relatively short call signals in shape of Morse code, on the other hand the telephone exchange either over the double line by a call sign with a relatively extended call duration or with a grounded Calling Rufstrom. This different mode of operation is chosen because it is perceived as annoying when the Call ao subscribers among themselves by means of agreed Morse alarm signals and make this call would make itself felt on the telephone exchange every time.

The call reception SiVorrichtung to achieve the extended call duration can, for. B. consist of a delay relay that makes contact after a certain time closes. As mentioned, callsigns are relatively short as Morse code Given the current closure period, the armature of the delay relay drops after the interruption immediately back to the rest position without reaching its end position, so that the mutual call of the intercom stations does not reach the switchboard.

In the arrangement with telephone exchanges connected at each end of the line But it was necessary that special keys be built into each subscriber station who only allowed calls in one direction or the other, so that the two end exchanges can each be called individually. For this purpose, two were used for each intercom Direction buttons or switches. Such directional traffic has a number of circuit ^ - and - operational disadvantages result, and one is therefore striving been to create facilities in which the call buttons and the telephone lines are omitted be branched off in parallel from the boom.

In the present invention, the above-mentioned purpose becomes that of the terminals To be able to call telephone exchanges specially, however, compared to the Morse code signaling for the other ordinary ones Making places insensitive is achieved in a simple and secure manner in all telephone exchanges that are automatic Allow calls using dials or the like. This happens because, after the connection with a such a line has been established in a known manner by means of dialing digits, now for the purpose of a different one Call signaling on the part of the calling station by dialing an additional one single or multi-digit number (e.g. by means of the dial ο. the like.) a control device is operated so that they according to their rush current number of The setting corresponding to the first digit determines the type of signaling, while the time gradation and the composition of the signals to Morse code in the time measure of the first or further selected digits by means of known ones Calling devices is effected.

The drawings illustrate an embodiment of the invention. In Fig. Ι it is shown schematically how such a so-called district line is connected, for example, at one (left) end in an automatic telephone exchange equipped with pre-selectors of a known type as a connecting line outgoing from the group selectors, which runs through a number of intermediate stations Z. and at the other (right) end in turn to a telephone exchange B, im. assumed case, one according to the call searcher system. In Fig. 2 and 3, the current flows for such a circuit arrangement are illustrated, omitting all details that are not necessary for understanding.

In the example chosen, the following three different types of signaling are possible:

I. The call to the intermediate stations.

For this signaling usually come from dots and! Lines together-

*) The patent seeker stated as the inventor:

Theodor Korthäuer in Berlin-Siemensstadt.

Set Morse code for use and the numbers to be dialed for this purpose formed from digits 2 and 6 according to their call duration. Should for example the intermediary, which has to respond to the sign "dash - dot", called after in a known manner the call-side connection with the desired free district line will be is established, 'the additional number 62 dialed. The following processes take place away:

After the selector GW has been switched to the free district line, the changeover contact i of a rush relay is switched to the working position and a relay V has been energized so that it brings its contacts into the working position. By

the normally open contact v ^z is closed for the automatic circuit breaker U , which runs via the arm of the control switch Sti in position 0 to the rotary magnet of the control switch D.St , so that the control switch takes a step out of its rest position. The current path through the arm Sti which has come into the intermediate position O ¹ is now interrupted as long as the contact v ² , that is to say during the entire duration of the connection, is switched over.

As soon as the first digit (6) is selected, the same number of switchings of contact i take place. When the first power interruption occurs and the contact i falls back, the circuit prepared by the normally open contact v ¹ for a second delay relay JV is closed via the control switch arm St2, so that it now responds and flips its contacts. The current impulse current circuit is now established via the normally open contact iv ^s , which advances the control switch from the intermediate position O ¹ by the number of steps corresponding to the selection number 6. The control switch is therefore in position 6. The two delay relays V and JV survive the current impulse in a known manner, so that their contacts remain in the working position.

As soon as the contact i has been closed again for a longer period of time after the dial has expired for the selection of the first digit, the different influencing of the relay JV, which is dependent on the setting of the control switch, comes about. In the present case, where e.g. B. 6 is selected, the control switch arm St2 has stopped on an empty contact 6, so that after the delayed dropping back of the rä contacts, the control switch magnet D.St over both the one arm and the other arm during the further duration of the connection ineffective is set. It should be noted, however, that the transmission of ringing currents is not hindered.

For the first call digit (6), the call relay R is switched on at the beginning of the current impulse by closing the normally open contact iv ^z and switched off after the relay JV drops back, i.e. a little more than the time for the current impulse to be effective.

If the next digit is dialed, e.g. 2, the circuit for relay R, which is expediently equipped with a drop-out delay, is closed only by contact i , which drops out when the current surge is generated, since the relay JV is not affected. As a result, the relay R will be switched on for a little longer than the time for the rush current of the next dial digit (2).

The connection is triggered in a known manner by de-energizing relay V. The control switch is returned to its rest position via the normally closed contact v- and the control switch arm Sti on the contact ^{segment O 1, I to 9.}

II. Calling the terminal (telephone exchange) with extended callsign.

This is longer for this type of signaling (compared to the Morse line symbol) Character is expediently brought about by the suffix of the number 9 in the first place.

The processes up to the generation of current impulses with this number take place in the manner described above. After the selector GW has been connected to the free district line, contact i is closed, relay V is energized, the control switch is in the intermediate position O ¹ . At the beginning of the current impulse, the relays JV and R respond, the control switch is set to position 9. In this case, however, the other intended influence comes into play in a positive sense. The relay JV remains switched on via contact 9, arm St2 until further notice. As long as this setting lasts, the call relay R is also activated, which causes the call current to be sent via the transformer RÜ into the two branches of the district line via its contacts.

The caller can now z. B. by post-dialing the number 1 the control switch bring to the next position on which his further influencing until the cessation of Connection is impossible, or he can still use any number besides this last digit (1)

Post-dial other digits, especially 9 to repeat the call.

III. Calling the terminal with a grounded ringing current.

For this type of signaling z. B. use the by-election of the number 3 in the first place. Here, too, the first processes proceed as in case I. At the beginning of the impulse generation of the first digit (3) to be dialed, the relay JV will respond in the manner already described to the control switch position ο ¹ . After the impulse has been given, the control switch is in position 3, on which the delay relay JV is no longer stimulated and therefore drops its armature. While the relay JV itself becomes ineffective and also puts the control switch out of operation for the duration of the connection, a changeover relay E is switched on in this position 3 of the control switch via arm St2, normally closed contact iv * , which is switched on via contacts e ¹ , e ² the switching of the loop line to an earthed simultaneous instruction depending on the call relay R causes.

The caller can set the relay R directly by pressing the contact i by means of the dial in motion by using any Morse code, e.g. B. by choosing the 2 or 6, there. An induction effect is exerted on the grounded coil in the transformer RÜ from the ringing current source PW , which emits periodic alternating currents, thereby sending ringing current over the two branches of the district line to the remote switch, in which the windings of a signaling device are also grounded in the middle.

Claims (5)

Patent claims: i. Arrangement for telephone lines with multiple intermediaries and telephone exchanges at the ends, their call through with agreed characters of different lengths and compositions Alternating ringing current takes place in automatic or semi-automatic operations, thereby characterized in that after connecting to such a line in known Way has been made by means of a digit selection, now for the purpose of a different signaling on the part of the calling party by dialing additional digits (z. B. by means of the dial) a control device (St) is actuated in such a way that it determines the type of signaling depending on its setting corresponding to the number of rushes of the first additional digit, while the time gradation and the composition of the signals to Morse code are timed the first or further dialed digits can be effected by means of paging devices known per se. 2. Arrangement for telephone lines according to claim 1, characterized in that already at the beginning of the rush current to adjust the control device a rush current outlasting reversing relay (JV) is switched on, which after completion of the rush current for the first digit in different ways depending on the selected position of the control switch (St) is influenced and thereby the necessary switchings which determine the type of signaling. 3. Arrangement for telephone lines according to claim 1 and 2, characterized in that the reversing relay (JV) in several positions (z. B. 1, 2, 4, 5, 6, 7, 8) of the control switch (St) during the further Duration of the connection is ineffective and thereby excludes the further activation of the control switch, but without preventing further call signaling through additional dialing (e.g. the number 2 for short, the number 6 for longer Morse code). 4. Arrangement for telephone lines according to claim 1 and 2, characterized in that the reversing relay (JV) remains switched on in a certain position of the control switch (eg 9) with simultaneous actuation of the call device, whereby a further actuation of the control switch for stringing call signals or for Disabling of the call device (e.g. by additionally dialing the number 1) is made possible. 5. Arrangement for telephone lines according to claim 1 and 2, characterized in that the reversing relay (JV) is switched off in a certain position (z. B. 3), but is replaced by another relay (E) , which is a special switching of the district line (e.g. on operation with a grounded ringing current). 1 sheet of drawings.