DE655089C - Circuit arrangement for telecommunication, in particular telephone systems for optional calling of preferred points on company lines - Google Patents

Description

The invention relates to a circuit arrangement for telecommunications, in particular telephone systems with several subscriber stations on a common line that can be called optionally.

The invention aims to selectively call preferred locations, which by the mutual calls of the other simple subscriber stations should not be disturbed.

Special call signs are therefore assigned to the preferred positions. With systems, with where the simple places z. B. only by consisting of short power surges (points) agreed characters are called, z. B. a slightly longer current surge (short line) as a special identification current surge for a preferred position, while in systems in which the call signs of the simple digits z. B. from short and slightly longer power surges (dots and short lines) as identification a longer current impulse (long line) is required for a preferred point. The essentials in all of these arrangements always consists in avoiding that a combination of call signs intended for simple branching points, which are made up of the same character elements as the calling signs of the preferred Put together, namely from power surges and power breaks, accidentally caused the call to a preferred location will.

There are already arrangements working with capacitor and resistor circuits become known, in which, several preferred positions by particularly long, for optional calling of the preferred positions among each other in their length as well different power surges are called. However, this is for different lengths Power surges require a very precise distinction that is not always feasible is, so that the safety of the company is endangered.

The arrangement according to the invention avoids the disadvantages of the known arrangements and ensures that the preferred locations can only be called to those locations Calling by the fact that time switch devices are influenced by capacitor currents, which depending on the duration of the pause, which follows a surge of current characterizing the preferred locations, at the desired one preferred location initiate the activation of the call facility and take effect at the undesired preferred location prevent the call setup.

According to the invention is preferred as a facility for selective calling

'") The patent seeker stated as the inventor:

Dipl.-Ing. Rudolf 'Nebelung in Berlin-Sicmensstadt.

Make a combination of two switching means used. Such switching means are z. B. As in the embodiment shown below, a condensate vi Stand arrangement in which an If only after the capacitor has discharged Auxiliary relay effectively influencing charging current comes about in combination with a time switch device, which only in ίο the case of the response of the capacitor current influenced auxiliary relay can be energized at all, and only then again to take effect after a certain period of time.

The object of the invention is shown in the accompanying drawing by means of an exemplary embodiment shown, to which the invention is not limited. They are only those necessary to understand the invention Details shown.

In the exemplary embodiment, a connecting line VL is shown, to which two preferred subscriber stations BSt ₁ and JiJTi ₂ and any number of simple subscriber stations TSt that call each other using certain characters (Morse code or the like) are connected. The preferred positions should not be influenced by the call signals with which the other subscriber units call each other and which are heard every time at all these subscriber units. For this reason, special call devices are provided at the preferred locations, which respond only to the special call signs assigned to the preferred locations. The preferred point BSt ₁ should be able to be called, for example, by a long current surge, the preferred point JiJTi ₂ by a long and a second current surge. It must be avoided that when the preferred body BSt _{2 is} called, the calling device of the preferred body BSt _{1 is also} excited, and it must also be ensured that after calling the preferred body BSt ₁ the initially also excited but not yet come into effect Call facility 'of the preferred location BSt ₂ is switched off again. The switching operations are as follows:

i. Call the preferred office BSt ₁

A particularly long current surge is sent over the connecting line VL .

] the preferred location BSt n ₁ speaks the relay A ₁ and energized via its contact Ia the relay ₁ -H ₁ which its contacts 2 A ₁ and 3A ₁ closes. _{JJ 1} remains attracted for the duration of the current surge. As a result, the capacitor C ₁ via the contact 2 A ₁ and the high-resistance Wi-

derstand HlV ₁ unloaded. Depending on the dimensioning of the high resistance, the. , Capacitor after a certain time, e.g. B. ekunden, discharged. The call sign of the Sorzugten point BSt ₁ is then chosen so that Qβ the current surge duration is longer than the time required to discharge the capacitor through the high resistance. After the end of the current surge, the ^ relay drops out, and thus also the JJ ₁ relay. As a result, the capacitor C ₁ can be charged via the contact 2, U ₁ and the windings I and II of the relay Ji ₁ . The relay Jv "responds to the charging current of the capacitor C ₁ only if the capacitor was previously completely discharged. When the ReIaJsJv ₁ responds, the contacts 4 ^ ₁ , 5 &i> 6A ₁ , 7Ic _{1 are} closed. Via the contact 5 Ie ₁ a holding circuit is established for the Ji ₁ -ReIaJs so that it remains pulled in. The winding of the thermal relay 7Vi _{1 is} switched on via the contact 6 Ii _{1 , which closes its contact 8UA 1} after a certain time and the call lamp AL _{1 to} the preferred position If the desired subscriber answers, pressing the reset switch Ab ₁ brings the call facility to the idle position.

. By a particularly long _i rush current yes also forms the first part of the call sign of the second preferred location BSt _2, the call organs have been excited in the second preferred location BSt. ₂ The relay H _{2 has been} switched on via the relay A ₂ by means of the contact Oa ₂ , whereby the contact 10 A ₂ is turned over; so that the capacitor C ₂ could discharge through the contact 10A ₂ and the high-value resistor HW _2. After completion of the rush current of the capacitor C ₂ as well as the capacitor C ₁ in the preferred location 5.Si ₁ is fully discharged. The relays A ₂ and H ₂ have dropped out again. The capacitor C ₂ is therefore charged again via the contact 10A ₂ and the windings I and II of the relay K _2. The relay Jv _{2 also} responds, as described for the preferred point BSt ₁ , and closes its contacts Hk ₂ , I2 & 2, 13 k ₂ , I4 & ₂ . _{The heating winding of the thermal relay TA 2 is} switched on via the contact 13 & 0, which closes the contact 15 ^ A ₂ after a certain time, but now, in contrast to the switching processes in the preferred position BSt _1, a third winding of the relay Jt ₂ switches on, which switches on the windings I and II of relay Jv ₂ counteracts and causes the armature of relay Jv to fall, so that the calling facilities of the preferred location Ji5 "i _{2 are} put back into the idle state.

the preferred office BSt ₂
The call sign of the preferred digit BSt., Consists of a particularly long and a second current impulse. Devices must be made so that the calling devices of the preferred location BSt ₁ do not also respond when the preferred location BSf _{2 is called.} The switching operations • o are as follows: First, the preferred position BSt _{1 is} considered. As already described with the call to the preferred location 55V ₁ , the relay A ₁ and H ₁ respond, so that the capacitor C ₁ can discharge itself due to the long current impulse sent over the line. After the end of the current surge, the relay K ₁ is excited by the charging current of the capacitor and switches on the winding 7'A _{1 of} the thermal relay. The pause between the first long rush current and the second rush current required to call the second preferred location is so short that the contact SiZi _{1 of} the thermal relay 77 / j is not yet closed when the second rush current is sent over the connecting line VL . The relays. ^ ₁ and JI ₁ respond again. By applying the contact 2A ₁ , the relay K _{1 is} switched off, but drops off with a delay since the winding I is short-circuited by the contact J ^ k _1. As a result, a circuit is established for relay L ₁ via +, Ab ₁ , S ^ ₁ , 2/4, 7A ₁ , L ₁ I, -. For the relay L ₁ , a holding circuit is switched on via contacts 17 / j and 3Zi _{1 for the duration of the pulse.} In addition, after opening the contact 5 It _1, the capacitor C _{1 is} connected to the minus and charged via the contacts 2Ii ₁ , ΐ6ί ^ , so that when the relays A ₁ and H ₁ drop out after the end of the second current surge, the relay K ₁ does not my * can be aroused. The call facilities of the preferred location BSt ₁ are therefore again in the idle position.

Let us now consider the switching operations in the preferred point BSt. ₂ : The first long current surge triggers the same processes as described when calling the preferred location BSt ₁ . Relays A ₂ and H ₂ respond and capacitor C ₂ is discharged during the surge duration. After the end of the current surge, the relay Jv ₂ is excited by the charging current of the capacitor and the thermal _{relay TA 2 is} switched on. In the short pause until the second current surge that now follows, contact 14M _{2 is} not closed. The relays A ₂ and IL _{2 are} re-energized by the second current surge and the relay K ₂ is switched off by opening the contact ioh _2. Since the relay K ₂ drops out with a delay due to a short circuit in the winding I, a circuit for the relay L _{2 is} closed via +, Ab ₂ , 12. It ₃ , 10A ₂ , 14 L ₂ , L ₂ I, -. The relay L ₂ 6g is held by its second winding via the contact 19Z ₂ . At the same time, the call lamp .4L _{2 is} switched on by contact 20/0. When the subscriber reports, the call device is brought into the idle position by opening the reset switch., 4O _3.

3. Call the other subscriber stations TSt to one another

The other subscriber stations call each other using special agreed signs, which are composed of short and long power surges and which are noticeable at all subscriber stations at the same time. However, the long power surges are considerably shorter than the extra long power surges used to call the preferred locations. As a result, the capacitors are not completely discharged at the preferred points even when calling signals with long current surges are transmitted, so that after the current surges have ended, the charging currents are insufficient to make the relay K respond. As a result, the call facilities are not switched on in the preferred locations when calling the other subscriber stations with one another.

Claims (7)

Patent claims: 1. Circuit arrangement for telecommunication, in particular telephone systems for optional calling of preferred points on company lines, characterized in that time switching devices (z. B. thermal relay via auxiliary relay K) are influenced by capacitor currents, which, depending on the duration of the break, which characterize the preferred points Current surges follow, initiate the activation of the call facility at the desired preferred point and prevent the call facility from becoming effective at the undesired preferred point. 2. Circuit arrangement according to claim i, characterized in that a relay group (7C ₁ , L ₁ or 7C ₂ , L ₂ ) is brought under the influence of further current surges by the timing devices controlling the duration of the identification current surge. 3. Circuit arrangement according to claim 2, characterized in that the call facility of the first preferred location is switched on if the relay group does not function after a certain period of time the following current surges are influenced by the identification current surge. 4. Circuit arrangement according to claim 3, characterized in that the First preferred site call facility is turned off when the relay group comes under the influence of current surges following the identification current surge within a certain time. 5. Circuit arrangement according to claim 4, characterized in that the Call facilities of the other preferred locations are switched off if the relay groups are not after certain Time can be influenced by the current surges following the identification current surge. 6. Circuit arrangement according to claim ι for the optional call of two preferred locations, characterized in that when you call the first preferred Position (e.g. by a long identification current surge and subsequent long pause) in the second preferred position by controlling the length of the pause Time switch device the relay group is switched off by switching on a counter winding. 7. The circuit arrangement according to claim 6, characterized in that (eg. Through a long marking impulse and after a short. Pause subsequent second current pulse) at call from the second preferred position in the first preferred position off the switching on of the call mark preparatory Zeitschaltemrichtung will. c For this purpose ι sheet of drawings