MXPA01006434A

MXPA01006434A - Circuit and method for remote feeding.

Info

Publication number: MXPA01006434A
Application number: MXPA01006434A
Authority: MX
Inventors: Kovarik Peter
Original assignee: Ericsson Ahead Comm Systems Gm
Priority date: 1998-12-22
Filing date: 1999-12-21
Publication date: 2002-07-22
Also published as: WO2000038404A1; AU1761000A; IL143876A0; EP1142294A1; BR9916492A

Abstract

The invention relates to a circuit configuration for remote feeding of a local component (21) which is connected to the exchange component (20) of an out-of-area switching device of a message transmission system via a transmission line (1, 2). Said device comprises a d.c. converter (14, 15) which preferably comprises a transducer-transformer (14). Said d.c. converter (14, 15) converts the voltage of a remote feeding voltage source which can be connected to a transmission line in the exchange component. Subscriber terminals which are connected to the local component (21) are thereby fed. A monitoring device (23) is provided in the local component (21). The current electrical power requirement of the local component (21) and the subscriber terminals connected thereto can be determined by said monitoring device (23). The remote feeding voltage source can be controlled by means of a transmission device which is connected to the transmission line (1, 2) by means of the monitoring device (23) on the basis of the electrical power requirement thus determined.

Description

CIRCUIT AND PROCEDURE FOR DISTANCE FEEDING FIELD OF THE INVENTION The invention relates to a method for the remote feeding of a local part joined by means of a transmission conduit to the official part of a pre-field device of a system. communication transmission, to which multiple participating conductors are connected, where the remote part is supplied, the local part with a source of remote power supply provided in the official part through the participating devices connected to the participating drivers, preferably to through positions of partial cuts. Background of the Invention Multiple applications find the power supply at a distance, for example in torque gain systems, which by means of signal multiplexing devices prepare two or more participating channels in a single transmission line of two wires, whereby a multiplication of the participating connections. The connection between the individual participants and the transmission conduit happens each time through a local part of a pre-field device directed for this purpose, which makes available for different states of activity of the individual participant of the call voltage and the bow current. According to the class of the activity state of the participating apparatus, for example, an applied state, a removed state, a call state, or others, a different power requirement is presented. The local part is fed from the official part of the pre-field device, usually with a constant distance storage voltage, which is measured, so that the maximum conduction length of the transmission conduit and the participating drivers Thus the maximum local load by the participant is offered to sufficient local power, in order to be able to feed all participants simultaneously. The pre-field devices that can be used in the context of the invention are not limited, but can also be used for data transmissions of all kinds. The voltage supply voltage is present in the current torque gain systems in the area between approximately 120 V (DC) and apparent 360 V (DC). As already mentioned, it is the current flow for safety reasons through transmission conductors limited to 60 mA. The remote power supply remains constant regardless of the operating state and the load states, in the participating drivers. It must therefore be selected so that, in the maximum power draw, the device is fully capable of operation through all the participants connected in the official part. For this reason, frequently the voltage of remote feeding reaches very high values. Therefore, it is the task of the invention to provide a method of the aforementioned type with which a reduction of the remote supply voltage is ensured, and yet also a continuous supply free of interruptions of the participant. According to the invention, this is achieved because the power take-off of the official part is measured continuously and when a predetermined limit value of the power take-off is exceeded, at least for a part of the devices, or activated apparatus the power supplied to the power supply is decreased. distance through the participating drivers. The state of the individual participant apparatuses is determined strongly by the speaking habits of the individual participants, but nevertheless it can not be predetermined in any way, so that for a large part of the operating time there is an average performance that remains largely below a theoretical maximum load, that in a maximum transmission duct length would produce maximum participant duct lengths, for all the participants and simultaneous activation of all the participants. Thus, the voltage of the remote feeding for an average load of the official part can be established per participant and for that according to the invention, when there is an increase in activity that becomes noticeable by the growth of the power take-off of the official part , power supplied at a distance for active or active devices is reduced. This is based on the circumstance that a large number of functions of the modern participating devices are also operable with clearly small powers, which are specified from the network operators, since the latter must be governed by what is given by the few devices that are still old. In another embodiment of the invention, the power supply of the official site can be measured continuously by means of the remote power supply flowing in it, by means of the transmission line, so that the power supply can be determined exactly under the provision of a remote power supply maintained constantly, by means of that current measurement. According to another embodiment of the invention, it can be carried out when a predeterminable remote power supply current is exceeded depending on the current activity states of the participating devices, a reduction of the voltage (s) applied for the correct maintenance of these states in the participating devices or current set in the vicinity of a predetermined value. If this deduction takes place for each active or active participant in a relatively small amount, this reduction will not prevent the functioning capacity of the individual participating parties, but rather allows a reduction for the necessary power for the participant fed at a distance. According to another feature of the invention, in the switched-off state of the corresponding participant device, the supply voltage of the participant and / or the supply current of the participant can be lowered or in another embodiment of the invention, be decreased in the call state of the participant. corresponding participant device, either the call voltage and / or the call current. In this way, during the operation of the communication transmission system according to the invention, extraordinary states of activity occur which, for a short time, produce a high joint power requirement, bypassing a remote power supply that remains the same relatively low, without this endangering the participant's food. Finally, according to another embodiment of the invention, the decrease in power supplied at a distance can be carried out step by step, where according to each step of the power reduction the power supply of the official room is compared with the predetermined limit value, and falling below the limit value the decrease is considered finished. By means of the stepped reduction of the power supplied at a distance, which can be selected analogously or digitally, the power supply of the official site can be adjusted in a positive manner to the limit value necessary for a stable power supply. According to another variant of the invention, the staggered reduction of the power supplied at a distance can be realized by means of an analogous regulation loop which is itself closed, this allows applications with relatively simple connection techniques. Furthermore, the invention considers a communication transmission system with an official part, with a remote power supply source, a local part powered remotely by means of a transmission conduit and participating apparatuses connected to the local part by means of participating conductors. and connected under intermediate connection in the participating positions. The task of the invention then consists, in producing a cited communication transmission system, which is operable with a relatively low distance power supply voltage, but which assures the presence of a very high or maximum activity level of the participants feeding all the participants. According to the invention, this is achieved because a device for the determination of the power supply and a device for decreasing the power supplied at a distance of the participating devices are provided in the local part, and the device for the reduction is Controllable by a control unit linked with the device for the determination of the power take-off. By means of the device provided for the determination of the power take-off, the power of the local part is continuously obtained and it is given again to the participating apparatuses. The measured values are compared to a pre-set limit value, and as soon as this is exceeded, the device for reducing the power supplied from a distance takes the initiation of a reduction in the power available to the participating devices, so that despite the a very high activity, all participants without disorder can continue to function. According to another embodiment of the invention, the device for determining the power supply can be formed by a current measuring device for measuring the current supplied at a distance. By measuring the distance-fed current, the power take-off can be captured accurately and reliably. In another embodiment of the invention, the device for decreasing the power supplied at a distance of the participating devices can be formed by a device for reducing the voltage supplied to the participant and / or the current of the participant. A very low decrease in the supply voltage or the supply current has a small power take-off effect, but the way of operation of the participating devices does not influence as long as this decrease is within allowed values. According to another variant of the invention, the device for decreasing the power supplied at a distance of the participating devices can be formed by a device for decreasing the call voltage and / or the call current. In this way, a reduction of the power supplied at a distance by a call alarm that operates with a voltage or a decreased current is performed, for which in most cases only a small variation of the call signal is made, since in the usual types of apparatus of this type lower limit values are provided for the call voltage or the call current, which are partially considered under the nominal values, so that these lower limit values allow reliable operation with a of small power. Furthermore, it can be provided in another embodiment of the invention, that the device for decreasing the power supplied at a distance includes a digital control loop, this has the advantage that it can be realized in an integrated constructive form. However, with a low circuit technical expense it is also possible for the device for the power reduction at a distance to include an analogous control loop through which a stepless regulation of the power supplied at a distance can be carried out. The invention also considers a method for remote feeding of a local part connected to the official part of a pre-field device of a communication transmission system where multiple participating conductors are connected, where the local part is fed remotely with a source of remote power supply provided in the official part. For technical safety reasons, the flow of current through the transmission conduit to 60 mA is limited. This corresponds to that value that in a good state of health a man can tolerate without permanent damage. The supply voltage is presented independently of the current power supply of the local part, which is determined essentially by the operating state of the participating conduit, for example by in the applied one, in the off state, and in the calling state. By the following technical development of the data pumps, increasing field widths and higher data rates are continuously achieved, for example, in the data transmission -HDSL. By means of high data rates it is also possible to cover more and more participants in a two-wire conduit.

Closely related to this, is an increase in the power requirement of each participant, as well as an increase in the width of the power field, which leads to a significant, permanent increase in the power supply at a distance. While the first pre-field devices had a + -60V type supply voltages, they now remain in the torque gain systems in the range of approximately + -130V, and approximately +180V, and even higher. A disadvantage of this tendency towards ever higher chosen supply voltages lies in the defective resistance to voltage isolation of the considered conductor pairs, while due to the long history of telephony about the service life of telephone conductors in the operating with usual official supply voltages of type 48V up to 60V, long-term experiences are already present, these still do not exist for the remote power supply voltages more than four times higher. Due to the scarce thickness of the insulation of the conductive veins, insulation problems can be caused which may result in cable damage. Together with the cases of disturbance caused by the insulation, the high supply voltages are endangered by the mounting personnel, which is applied directly if, for example, connecting or subsequent works are applied to the transmission conduit in the local area. A growing number of post-realizations are practiced to achieve a remote power supply as low as possible from the manufacturers of this remote power system. However, a decrease in the remote power supply voltage means that it is possible to reach narrow adjustment steps in the power supply of the participant, if in the accumulated load times a certain number of active participants is exceeded. Summary of the Invention. Therefore, it is the task of the invention to provide a method of the type mentioned at the beginning, with which the power supply is guaranteed with remote power supply adjustable to the current relations, and with which it can also be established during the charging time enough power for all the participants. Another task of the invention consists in allowing a calm step with existing resources, for example, two-wire conductors, which can be designated as "Change Copper to Finally, it is another task of the invention to allow a sufficient personal protection within the transmission systems of remote-fed communications In accordance with the invention, this is achieved because, the current operating state of the participating drivers, it is continuously detected in the official part or in the local part and the detected operating state receives the coordination of a remote power supply that corresponds to the current power requirement of the local part powered remotely and the participating conductors and adjusts the power supply voltage to the coordinated voltage value in such a way, the power supply of the local part in a large part of the operating state is determined essentially in the "on" states "off" and "call" of the participating drivers, because of the possibility of covering the conduits Participants are active in remote-fed systems on a temporary average only a partial fraction of the participants. The method according to the invention allows, in this operating state, the reduction of the remote supply voltage over long periods of time, for example, during the night hours. It can be assumed that the total distance power supply is only used in isolated cases. This occurs in the application of the method according to the invention, a reduction of the electrical effort in the insulation of the cable. The voltage of remote feeding only applies if this is necessary, therefore less corrosion occurs in the non-isolated parts of the installation. In addition, in this way a better protection of the maintenance and assembly personnel against electric shock is attainable. In the first installation of the system, the remote supply voltage is reduced correspondingly to exclude assembly personnel from all danger. Another advantage is that, in reaching a low probability of upset, the overvoltage shunts filled with gas used in conventional sorting offices present the property that with fast transients they are already ignited under the static ignition voltage, the more it is this, more is the spark section by means of a uniform tension. This behavior leads to a short-time fall of the transmission section in practical operation, since the synchronization must again be established, without this being necessary for reasons of overvoltage protection. In another embodiment of the invention, it can be provided that more and more operating states of the drivers of the participants can be collected in a group, to which each time a remote power supply is coordinated. In many countries it is the taking of power of the local part approximately equal in the so-called feeding, the number of differentiable cases is indicated in a system with N, participants as N + l. According to another embodiment of the invention, in the transient of an operating state it is possible to connect the remote supply voltage by means of a transient function in the following one. In order to avoid upsetting the transmission of data by the switching processes of the voltage supply source from one voltage value to the other, a voltage variation is usually carried out which, in its time course, is configured in such a way that it has few waves, for example a transient function that takes into account a correspondingly long time. According to another embodiment of the invention, the remote supply voltage can be increased or decreased depending on the number of participants in equal voltage steps, where in the step or transient from the idle state to a participant or conversely, a higher voltage step is provided with respect to equal voltage steps. The highest voltage stage occurs, because in the idle state or in standby mode, different circuit parts of the remote supply are deactivated. Furthermore, the invention relates to a communication transmission system with an official part of a pre-field device, a remote power source and a local part powered remotely, by means of a transmission conduit, where they are connected participating devices, where the official part or the local part each time presents a detector, for the detection of the operating states of the participating drivers and the official part is in union with the local part, by means of a transmission unit of data. It is the task of the invention to provide such a transmission system with which sufficient personal protection and a low average voltage load in the transmission conduit is achievable. According to the invention, it is thus achieved that the source of remote power supply is remotely controllable at its output voltage, where the source of remote power supply is connected to a control input of a power supply unit. control, control unit that is connected with the output of at least one detector to detect the operating state in the official part and connected with the data transmission connection. In this way they can be used in the official or local part, already existing detectors for the detection of the different operating states, where the operating states determined in the local part, are transmitted by the data transmission unit to the official part. Because of the possibility of controlling the remote power supply source, this can be adjusted to the particular power requirement. In the activities of average participants, therefore, there is a lower voltage supply than what would be necessary for the feeding of participating activities at the peak. From US 5,754,644 A; A procedure for reducing the power losses in the remote power supply of participating devices is carried out by means of a participating duct, where the flow of the loop current of the individual coordinated devices is measured of the corresponding participating devices and a coordinated threshold voltage to that loop current is read in a data bank. By means of this, the sensed proportion of a voltage transformer is controlled in a responsible central position for remote power supply, whereby an exact distance supply voltage is established, which is necessary to maintain the loop current. Essentially, the power requirement of the participating apparatus is not determined from a local party and the participant in that connected party. In addition, it describes US 5,289,359 A; a transmission system consisting of a selection office, an official part, and a local part, where the local part is fed from the official part and the remote supply voltage for the generation of a supply voltage is Transforms into a DC voltage transformer with pulse width modulator. As soon as the stored charge is necessary, a digital signal is sent to the selector office and as a reaction to it within the selector office the voltage of the remote supply is changed correspondingly, where by means of a load curve of a capacitor it is determines how high the current power requirement is. A power supply input for the end or telephone devices, according to DE 32,04429 Al; it is carried out by means of a switching regulator arranged in a central position, which is controlled in such a way that the supply voltage emitted from it is equal to the sum of the voltage in the peripheral end device and to the voltage loss in the conductive resistance. In the extreme device, a voltage stabilizer is installed with a regulation element in series, where the voltage stabilizer produces in the voltage oscillations in the end device by its behavior, the conformations necessary to increase or decrease the supply voltage from distance. By means of the regulation process, it must be ensured that the supply voltage for the operating units of the end device maintains a constant value by a corresponding control of the remote supply voltage applied in the central position. In order to prevent a disturbance of the data transmission by the method of switching the voltage supply data of the remote power supply from one voltage value to another, a voltage variation is usually made which is shaped in its time course in such a way , which is linked with few higher waves, for example, a transmission function similar to a sinusoidal one that corresponds to a long time is selected. During this transmission time, a sub-feeding of the local part may occur. Therefore, a continuous adjustment of the remote power supply voltage to the current power requirement is assumed where, during transmission times that occur between two voltage values different from the remote power supply source, the feeding must always be guaranteed without interruptions. This is transformed or changed in a news transmission system, with a transformer transformer, transformer of direct voltage which transforms the voltage of a source of voltage of remote feeding connectable in the official part to the transmission conduit, and with this it feeds the participating extreme devices connected to the local part, where an overspeed device has been provided in the local part, with which the need for current power of the local part and of the outboard end devices connected to it is determined, and where the source of remote power supply voltage in the official part is controllable by means of the monitoring device depending on the need for determined power, by means of a transmission device attached to the transmission conduit and the voltage of the transmission is adjustable. power required for the current power requirement, in the official part, thus achieving that an accumulator is switchable by means of a switch or controllable switch in a power input of the DC voltage converter, where at least one of the accumulator connections, it is connected by means of a load branch which contains a rectifier element, if necessary by means of the intermediate switching of another rectifier element, with one of the veins of the switching element and the monitoring output of the monitoring device is connected to the control input of the controllable switching, where the voltage in the accumulator is monitored continuously The battery and the accumulator in the event of a loss of charge, is charged by means of the discharge power supply source in the official part. In this way, an adjustment of the remote supply voltage can be made to the current power requirement, whereby this can be maintained at relatively low values during an average operating state. In a stronger activity of the participants, the voltage of the remote power supply must be correspondingly increased, where the request for retraction by means of the transmission device is allowed. In order to change the remote supply voltage in an operating state with a low fraction of active participants, to a higher number of participants, intermediate narrow power steps must be taken into account in the times, so that the power supply of all the participants and the local part including, control of the local part is damaged. Especially they are presented with fast variations of the supply voltage at a distance, higher waves in the transmission conduit that can cause a disturbance in the transmission of data. Correspondingly, variations in the supply voltage should be made in a way that they are free of higher waves as much as possible, resulting in a corresponding higher transmission time between two voltage values. Only, for this reason can not be governed how quickly you want variations in the need for power, which can lead to cases of supply failures, such influences on the supply, can be avoided by the present invention. The necessary power can be applied during the adjustment of the distance supply voltage to the current power requirement, for the load stored in the accumulator. In another embodiment of the invention, it can be provided that the power input of the DC voltage converter is connected by at least one rectifying element to the veins of the transmission duct. In this way, it is avoided that in application of the accumulator to the input of the DC voltage converter, it is possible to reach a discharge of the accumulator by other connecting parts or of the switching circuit according to the invention. In a preferred embodiment, the loading branch is formed by a series connection of a rectifier element and a resistor, so that only a charging current can flow into the accumulator via this branch. The controllable switch or switch for joining the accumulator with the power input of the converter transformer can be formed by an FET, which allows a very efficient control of the accumulator to be achieved. According to another feature of the invention, the connections of the accumulator can be connected to the inputs of a voltage comparator, whose output is connected to the transmission unit, by means of which the voltage of the voltage source of the accumulator is adjustable. feeding in the official part at a higher load voltage, where a voltage threshold of the comparator is passed down by the accumulator voltage, the supply voltage source establishes a high load voltage value, and subsequently when a comparator threshold voltage threshold is exceeded, it is returned to the value previously established. . In this way the voltage in the accumulator can be constantly monitored and taken care of for a sufficient load of it. In another embodiment of the invention it can be provided that the voltage in the accumulator is monitored continuously and the accumulator in the event of a loss of charge is charged both by means of the source of remote power supply in the official part is charged until the high charge voltage in the accumulator is reached and when the highest load voltage is reached, the remote supply voltage is reset to its previous value, returning and the power requirement is measured continuously by the participant end device stored in the local part, and when there is a supply of power that is not enough, on the local side, the controllable switching is connected and the accumulator is connected to the power input of the DC voltage transformer. So a large part of this load goes to the DC voltage converter, where an increase in the supply voltage is also allowed as corresponds to the current power requirement. In this way an automatic recharging of the accumulator is achieved, so that also after long pauses in conversation, the consequence is a state of sufficient charge of the accumulator. The invention also considers a method for the remote feeding of a local part linked by means of a transmission conduit to the official part of a pre-field device of a communication transmission system, a local part to which, for example, one or several participating devices are connected by participating drivers, where the local part or the official part is the partial power supply device or the partial device to be fed and vice versa, and where it is fed remotely with a source of remote power supply provided in the partial feeding device, the partial device to be fed. An increasing number of network drivers goes through this to demand the lowest possible power supply from the manufacturers of this remote power system. However, a reduction in the supply voltage at a distance leads to narrow steps in the supply of the participant, if a certain number of active participants are exceeded during times with maximum peak load. It is therefore the task of the invention to offer a method of the aforementioned type so that the supply voltage is guaranteed at a distance with the supply with one of the current proportions and with this also during times of maximum load, sufficient preparation can be prepared power for all participants in the place part or in the feed through the local part in the official part. Another task of the invention is to allow a pleasant transformation with existing resources, for example two-wire conductors. According to the invention this is achieved because in a test step in the partial feeding device the power consumption of the device to be fed and the lost power of the transmission conduit are obtained, and thus the power requirement of the partial device is known. it is to be fed, the power resistance between the partial power supply device and the partial device to be supplied is calculated, and depending on the power resistance reached and the operating state of the partial device to be powered, it obtains the necessary voltage remote power supply and the required power supply voltage is set to the corresponding value. In this way, the remote supply voltage can be established by the actual withdrawal between the partial power supply device and the one to be powered and the operating state of the partial device to be powered, so that an important reduction of the remote supply voltage is adjusted in an average discharge of the partial device. The direct measurement of the actual power consumption, which brings a relatively good accuracy to obtain the conduit, is essential here. The power resistance is therefore the most essential quantity to be captured in order to determine the necessary distance power supply. In another embodiment of the invention, the device to be fed can be the local part and the partial device feeding the official part, where the power expenditure of the local part to be fed is determined by obtaining the number of the active participants. In the knowledge of the power expenditure of the participants, can by the number or content of the active participants find a statement about the state of operation of the local part. According to another embodiment of the invention, an adjustment of the remote supply voltage to the activity of current participants is carried out, when the power supply voltage obtained or established is low or high depending on the operating states of the devices. participating drivers. According to another variant of the invention, the voltage of remote feeding can be lowered or raised depending on the number of participants by steps, where in the passage from a state of idling to a state with an active participant or vice versa, provides a higher voltage step than the preferably equal voltage stages. The voltage stages can in systems with different operating voltages of the participants also have different heights.

Each increase or decrease in the number of participants, corresponds with that to a voltage step with which the power supply voltage is raised or lowered. The highest voltage stage in the vacuum state transition to the active operation of a participating device is then presented because in the case of vacuum operation or Stand-by operation, additional connection parts are deactivated. In long participating drivers, the increase or decrease in the number of participants around one or a few participants acts only sparingly with respect to the need for power. In another embodiment of the invention, it is therefore possible to increase or decrease a voltage step as the number of active participants increases or decreases in a predetermined number of participants. For example, only a voltage increase is made when we assume that three other participants have been activated. According to another characteristic of the invention, it can be the partial device to be fed, the official part, and the partial device that feeds the local part, where the operating state of the official part to be fed is determined and transmits by the transmission conductor to the local feeder part. In this way it is possible in installations in which the essential constituent part is concentrated in the local part, to perform a remote feeding of the official part, so that it is always only supplied when the local part is in operation. This can be advantageous, for example, in data transmission installations, which are in the official part and with whose fall or abandonment also the official part should not be operated much more. The remote power supply voltage obtained and established by the test step can, in another embodiment of the invention, be increased or decreased depending on the state of operation of the official part, with which it is fed independently, increasing or decreasing , of whether the official part is in a state of idling, or in an active state. Thus, for each operating state, an exactly defined voltage step is coordinated.

It can also be provided that the value obtained from the remote supply voltage is conducted to a regulation amplifier as a nominal value, with which the remote power supply voltage is regulated. With this, the distance supply voltage is compared or equalized exactly to the nominal value obtained. Furthermore, it can be provided that during the passage of an operating state, the remote supply voltage is switched by means of a transmission function. In order to avoid a disturbance of the data transmissions by the switching processes of the voltage supply source from one voltage value to another, a voltage variation, which is formed in its time course, is usually carried out in such a way having a relation to a few higher waves in the transmission frequency field, for example, a suitable transmission function is selected that takes a long time into consideration. Establishing or adjusting the remote supply voltage to the corresponding conductive resistance between the local and the official part can then be performed in a particularly advantageous manner, if according to another embodiment of the invention the test step takes place each time for the operating principle during the overpass of the remote supply voltage.

DESCRIPTION OF THE DRAWINGS The invention will be explained in more detail below by means of the exemplary embodiments represented in the drawings. Where FIGURE 1 shows a block connection image of a communication transmission system with a circuit according to the invention, in an embodiment of the circuit according to the invention. FIGURE 2, a connection image of another embodiment of the circuit according to the invention; FIGURE 3, a diagram of the remote power supply voltage according to the invention modified according to the number of active participants. FIGURE 4 a block connection image of an embodiment of the news transmission system with remote power according to the invention.

FIGURE 5, a block connection image of another embodiment of the communication transmission system according to the invention. FIGURE 6, a block connection image of another embodiment of the communication transmission system according to the invention. FIGURE 7, a diagram of the varied remote power supply voltage according to the invention depending on the number of active participants. FIGURE 8 a replacement connection image of the communication transmission system according to Figure 6. FIGURE 9, another diagram of the varied remote power supply voltage according to the invention, depending on the operating state of the partial device that has to be fed. Description of the Invention Figure 1 shows a part of a communication system with remote power supply, for example a profit pair system, where an official part 20 and a local part 21 of a pre-field device are linked by means of a transmission conduit 1, 2 ', as a local part is to be understood a totally pregeneralized form of the remote-fed part, which contains a digital analogue cutting position between the transmission conduit and the participating conduits. A local part of this form can therefore, within the framework of the invention, not only be carried out in pair-gain systems but also, in xDSL systems or similar comparable systems. Correspondingly, the official part is the remote feeder part which each time contains an official analogous or digital cutting position between the central telephone data system and the transmission conduit. Here, too, the invention can be realized for all forms of known analog or digital official parts. From the local part 21, in the example of embodiment shown N = 4 cut-off positions are fed remotely, which is below the number N of participants, but it is not a limitation. The power requirement varies depending on the number of instantaneous active participants. The local part 21 is fed by means of the official part 20 with a remote supply voltage through which, after a transformation, the participating end devices connected to the local part are fed. For each time only having to maintain the smallest remote power supply voltage possible on the transmission conduit 1 ', 2' is provided according to the invention in the local part 21 a monitoring device 23 with which the need is determined of current power of the local part 21, with the participating end devices connected there. The remote power supply source found in the official part 20, which is not shown in FIG. 1, is controllable by means of the monitoring device 23 depending on the need for power set by means of a control device. transmission 24, which in turn is connected by means of a separating device 25 to the transmission conduit l1, 2 '. From the separation device 25, the separate supply branches according to a direct current from the data transmission by means of a transmission line 1, 2. The control data can then, for example, be transmitted by means of a control channel to the control channel. transmission conduit 1 ', 2'. The power requirement of the participating end devices connected to the local part 21 is determined continuously and the supply voltage is adjusted accordingly in the official part 20 necessary for the current power requirement, where the necessary supply voltage each time, previously it has been obtained preferably empirically for all operating cases. This can also be done in the manner described below. At the input of the local part - DSL in the idle state a known resistance Rx is connected and during the connection of the remote supply voltage the loop resistance is measured which is composed of the conduction resistance of the transmission conduit 1, 2 and of the known resistance Rx. From the measurement result obtained in this way, the optimum remote power supply voltage can be calculated for all operating cases. During operation, by means of the monitoring device 23 and the transmission device 24, the current power requirement is transmitted to the official part 20 and the distance supply voltage is modified accordingly. With this, during normal operating times, a relatively low distance supply voltage can be set, which is advantageous both from the point of view of safety techniques, as well as with respect to the load or effort of the cable. The circuit shown in FIG. 2 can be used for bridging rapid charge tilts, which, together with the DC voltage transformer 14, 15, contains connection parts which, during the time required for the subsequent regulation of the voltage remote feeding, they make available electric power for a short time. The transmission conduit 1, 2 corresponding up to a decoupling according to the direct current being conducted in the separation device 25, against the data transmission, of the transmission conduit 1 ', 2' is connected to a capacitor load 10 of a bridge DC rectifier formed of four rectifier elements 3, 4, 5, 6. The remote supply voltage can be applied with this, regardless of the polarity in the transmission conduit 1, 2, given the In this case, curl voltages which, if any are present, are flattened by means of the charge capacitor 10. The capacitor 11 comprises a part of the high frequency disorder. The DC voltage transformer supplied by the remote supply voltage is formed according to FIG. 2, by means of a converter transformer 14, of which only the primary side is represented and a pulse-operated switch 15 which vibrates the voltage corresponding to its control. The converter transformer 14 converts the voltage of the remote supply voltage source connected to the transmission conduit 1, 2 into the official part 20 and thereby feeds the participating end devices connected to the local part 21. An accumulator 12 is connectable by means of a controllable switch 13 to the supply input of the direct current converter 14, where a load branch 7, 8 contained in the connection of the accumulator 12, by means of a continuous rectifying element 7, is connected to one of the vents of the transmission conduit 1, 2. A control output of the monitoring device 23 is thus connected to the control input of the controllable switch 13. The necessary energy for a very short time is taken during the corresponding control of the switch 13 from the battery 12, which in predated times, for example after the termination of the conversation of a participant or according to the need idad be loaded. By closing the switch 13 which is preferably formed by a field effect transistor FET can the amount of charge stored in the accumulator 12, flow to the DC voltage converter 14, 15 and thus compensate for the previously caused power gaps. To prevent the accumulator from being discharged or loaded into other parts of the circuit, and thereby reducing the related power losses, there is the supply input of the DC voltage converter 14 connected by at least one rectifier element 9 with the conduit veins of transmission 1, 2. The load branch is formed of a series connection of a rectifier element 7 and a resistor 8, which allows only one charge current in one direction. The charging can be done at a pre-determined time for example after a conversation termination of a participant or as the need arises. For this end, the accumulator connections 12 are connected to the inputs of a voltage comparator, not shown in FIG. 2, whose output is connected to the transmission unit 24, by means of which the voltage of the supply voltage source is adjustable. in the official part at a high load voltage, on which a charge of the accumulator 12 can be carried out. To equalize the own charge of the accumulator 12, in the lower passages of a comparator voltage gate and when subtracting a voltage threshold of lower comparator, by the voltage of the accumulator, the supply voltage source is established at a high load voltage and after exceeding a higher comparator voltage threshold, it is returned to its previously established value. The voltage is continuously monitored with this in the accumulator 12, and the accumulator 12, in the event of a loss of charge, is charged for such a long time via the source of the remote power supply voltage in the official part, that the voltage source supply in the official part, rises until the high load voltage is reached in the accumulator 12 and when the high load voltage is reached, the remote supply voltage returns to its previously established value. In this way the accumulator 12 is continuously charged at a sufficiently high voltage, in order to be able to master the narrow power steps in case of need for a very short time. By the recognition in the official part, that voltage is established at a distance that is adequate for that operating state. If a considerable increase of the participating connections takes place for a short time now, there is a need for high power, which the established remote power supply can not control. Subsequent regulation of the remote supply voltage in the official part, however, can only be carried out in a certain period of time, to avoid the production of super waves which would have a transient effect on the transmission of data through the conduit of transmission . In this way, the power requirement of those participating final devices powered through the local part is measured continuously and when a non-sufficient power supply is presented through the local part 21, the controllable switch 13 and the accumulator are closed. 12 is connected to the power input of the DC voltage converter 14, so that it supplies its load to the DC voltage converter 14, which also allows an increase in the supply voltage as corresponds to the current power requirement. The accumulator 12, covers with this during the time in which the remote power supply voltage rises, the need for additional power. Subsequently, the high supply voltage corresponding to the intermediate time, takes the full power supply of all the participants. The remote supply voltage measures in the diminished state, in which an average activity of participants between approximately 94V and approximately 100V is controllable, with respect to the remote power supply voltage at that usual time or typically 166V to 176V. The transformer converter 14, therefore, must be defined for a larger input voltage field, for example 60V to 180V. Furthermore, the possibility of promoting the correct maintenance of the continuous charge state of the accumulator 12 is presented in such a way that, after each conversation termination of a participant, the set value of the distance supply voltage is maintained for a longer time. predetermined or until a predated voltage is reached in the accumulator 12, so that the accumulator 12 is fully charged and the remote supply voltage first decreases to a reduced value. In this way, the accumulator 12 is charged to a charging voltage corresponding to a vacuum value of the distance supply voltage required for each operating state., without the load by the instantaneous participants in the inactive state. Retraction of the remote supply voltage can be controlled in time or controlled by a comparator. The subsequent loading with the predetermined time space mentioned above has the advantage that the aging effects of the condenser capacity can not be observed. This can be compensated when the existing comparator monitors the load and only until the pre-set voltage value is exceeded, the subsequent charging process ends in the accumulator 12. Figure 4 shows a part of a communications transmission system with remote power, for example a torque gain system, where an official part 12 and a local part 210 of a pre-field device are linked by means of a transmission conduit 71 •, 72 '. As a local part, it is understood here in its generalized form the part fed at a distance each time, which contains a position of analogous or digital cut between the transmission conduit and the participating conduits. A local part of this form, therefore, can be realized in the framework not only in even gain systems, but also in systems -xDSL or other comparable systems. Correspondingly, there is the official part of the remote-powered part in which each time an official analog-digital cutting position is found between the central telephone data system and the transmission conduit. In the exemplary embodiment according to FIG. 4, for example, together M official cutting positions have been provided. Also in reference to the official part, the invention can be realized for all forms of known official, digital or analogous parts. From the local part 210 they are fed at a distance in the example of embodiment shown 4 = N positions of cut participants, the number of participants N is below but does not represent any limitation. The need for power varies depending on the number of instantaneous or current active participants. The local part 210 is fed by means of the official part 200 with a remote supply voltage, by means of which, after a transformation, the participating end devices connected to the local part 210 are fed. The supply voltage source at a distance that is in the official part 200, which is not shown in figure 4, is connected by means of the transmission conduit 71 ', 72' to the local part 202. The separation of the data traffic and the voltage of the feeding takes place by means of a separating device 250. From the separating device 250, the separate supply branches according to the direct current of the data transmission by means of a transmission conduit 71, 72. In order to maintain a voltage remote power supply as small as possible in the transmission conduit 71 ', 72', in accordance with the invention, the operating state is continuously detected ac of the participating conduits 220 in the official part 200 or in the local part 210, and at the detected operating state, a remote power supply voltage is coordinated each time corresponding to the current power requirement of the local part supplied remotely 210 and to the participating conduits 220 connected to it. Correspondingly, the remote supply voltage is adjusted to the coordinated value. The official part 200 is in conjunction with the local part 210 through a data transmitter unit not shown, by means of which the data between the local part 210 and the official part 200 are interchangeable. Thus, it is provided in the part local 210 at least one detector to detect the operating status of the participating conduits, which detect a curl of participants for example, by the abandonment or entry of a participating listener and the variations of state are communicated by means of a data channel of the data transmitter unit of the official part 200, where these are recorded. In existing official parts, there is also at least one detector not shown to detect the operating status of the participating conduits 220, which find application for the method according to the invention. In accordance with the invention, the source of remote power supply voltage is remotely controllable at its output voltage, wherein the remote power supply source is connected to the control input (not shown) of a control unit, which it is connected to the output of at least one detector for detecting the operating state in the official part and with the data transmission unit. With this, the operating states can be captured by means of the existing detectors and the data transmission unit. In the case of an idle run in which all the participants are inactive, a voltage supply of distance to idle running is set U0 which guarantees a supply of the local part at a distance as long as possible from the official part 200 The rest current tap of the local part 210 is approximately constant. If a call is fed to a participant, then this state of operation in the official part is detected by the detectors and this operating state automatically by a coordinate control coordinated to a distance supply voltage corresponding to the power requirement of the participant conduit 220. The elevation of the remote supply voltage is linked with a certain delay time, especially when it is switched off to avoid disturbances of the data transmission during the passage from one operating state to the next, the supply voltage at a distance, by means of a transmission function, for example descendant sine (descending Sine). But since the call power is already detected in the official part 200, it can with this the remote supply voltage still before the beginning of the actual call, rise to a value which corresponds to that operating state. This prevents you from reaching a narrow or narrow passage of power. The withdrawal of a participant can be recorded in the official part 200, when this variation of state is detected, by means of the detectors provided in the local part 210 and by means of the data transmission unit of the official part 200 is obtained where for the power supply necessary for the participant, the arrangement is adjusted first after a delay time. This is determined because first of all the coordinated power supply voltage must be presented to each operating state in the local part and in all its height or magnitude and only after feeding for the participating device, it is prepared where, for example, in many countries a delay of up to ls is allowed. This method of processing, however, represents only one of many possibilities in a manner in which the current operating state can be detected and the remote supply voltage adjusted correspondingly. Exactly as in the increase of activity for an elevation or application of the voltage of remote feeding, in the decrease of activity of the participant the tension of feeding to distance is lowered where it arrives at a downward movement along the tensioning of tension shown in FIG. 3. Since the power take-off for all the operating states of all the participating conduits 220, as well as the operating states are determinable and with this sufficiently well known, it can for example the supply voltage a distance is controlled correspondingly to a characteristic line of stepping depending on the number of active participants, as this has been shown as an example in figure 3. To each operating state with 0, 1, 2 ... 8 active participants, therefore an exactly defined voltage value Ui, U2 is coordinated ... In eight active participants the remote power supply voltage reaches its highest value. In many countries, it is the power draw of the local part in power call approximately the same size, the number of different cases in a system with N participants, is then N + l, as shown in figure 3. This means that each time several operating states of the participating ducts are joined in a group to which a remote power supply voltage is coordinated. If an increase in the activity of participants takes place in the form of a jump, then the voltage of remote feeding is raised in the same way, where under certain circumstances several voltage stages are skipped. The staging of the remote power supply voltage can be carried out in the desired way, while in simple systems only two or three remote power supply voltage values can be made available, where a first value, for example for a Average discharge and a second value for a tip load can be determined. The height of the individual voltage stages can be determined by calculation or empirically. In the selection of voltage supply values from a distance, the length of the transmission conduit must be considered. In the embodiment, according to Figure 3, the power supply voltage is increased or decreased correspondingly to the need for equal power of the participant, depending on the number of participants in equal voltage stages, where the change from the state no-load operation (stand-by) to a participant or vice versa, compared to equal voltage stages, higher voltage stages, since in the idle state, different connection parts of the power supply are deactivated. distance. In the block connection image according to Figure 5, there is shown a communication transmission system with a pre-field device formed of an official part 110 and a local part 120. On the selective official side, they are formed N - Official cut-off positions 130, whose number may vary as desired. In the exemplary embodiment according to FIG. 5, four official cutting positions are formed together. The local part 120 is connected to the official part 110 by means of a transmission conduit 101, 102, by means of which the remote supply of the local part 120 is also carried out, as this is, for example, common in profit systems in pair (Pair-Gain). For this purpose, a remote voltage supply source, not shown in FIG. 5, is provided in the official part 110, which has a constant distance supply voltage and is equipped with a current limitation, on which it is determined or sets the maximum value of the given current from the source of remote power supply, for example with 60 mA. This corresponds to the usual arrangement of a torque-fed remote power system, but can also be used for other classes of remote power systems. In particular, applications of this type can be found, not only for voice transmission but also for data transmission, for example in xDSL systems or similarly comparable systems. As a local part, it is to be understood in a general way each part fed at a distance, which contains an analogous or digital cutting position between the transmission conduit and the participating conduits. Correspondingly, it is the remote feeding part, in which each time an analogous or digital official cutting position is found between a central telephone data system and the transmission conduit 101, 102. From the local part 120, N participating conduits, in the embodiment according to Figure 5, altogether four participating conduits 131, which are joined by means of participating cutting positions 114, 115, 116, 117 with participating apparatuses 104, 105, 106, 107, which are fed at a distance by means of the local part 120. The number N of the participating ducts 131 is increasing of two but, it does not establish any limitation and can be selected at will within the framework of the invention. Depending on the activity state of the participating devices 104, 105, 106, 107, different voltages are presented in the participating conduits along with the voice signal. 131. If a participant is to be signaled by an elongated call, he connects a logic of control not shown in the local part 120 to the corresponding participant channel 131 of the call voltage, which in the called party generates a call signal. As soon as the participant disconnects the handset from the participating device, the generation of the call signal is interrupted and a participating power supply or loop current is applied, which allows the power or supply of the participating device. Each of these states of activity produces a determined power usage, which adds to a joint power need of all the participants connected to the local part. To ensure sufficient power for all connected participants, the local power supply must also be sufficient, if all the participating extreme devices are in a raised state or all the participants simultaneously receive a call or a combination is presented. those states, where each maximum length is assumed of the transmission conduit or of the participating conduits. This means first of all with a large number of participants, for example in a pair gain system, a clear decrease in the amplitude of the supply field or the need for a corresponding increase in the supply voltage at a distance. The latter can not be increased at will due to technical safety considerations and due to the problems that arise from material loading or isolation, with the highest power supply voltage. In order to be able to apply a relatively low distance power supply, it has been provided according to the invention that the power input of the local part 120 is measured continuously and when a predetermined limit value of the power take-off is exceeded, at least for a part of the activated or active participant apparatuses 104, 105, 106, 107, the power supplied at a distance is reduced by means of the participating ducts 131. For this purpose, a device 123 for the determination of the intake is provided in the local part. of power and a device 122 for lowering the power supplied remotely to the participating apparatuses 104, 105, 106, 107, where the device 122 for decreasing the power supplied at a distance is controllable by means of a control unit 124 connected with the device 123 for the determination of the power take-off. In the exemplary embodiment according to FIG. 5, a current measuring device 123 for measuring the remote supply current I, in which the power take-off is provided, is provided as a device for determining the power take-off. it performs by continuous measurement of the remote power supply current I flowing through the transmission conduit 101, 102 in the local part 120. But the determination of the power take-off can also be carried out in another conventional manner. If it exceeds a predetermined value of the remote supply current I, then a reduction of the voltage applied for the maintenance of this state in the end devices is carried out depending on the current state of the participating end devices 104, 105, 106, 107. participants 104, 105, 106, 107 or a reduction of the current set to a certain predetermined value. In the switched-off state of the corresponding participating apparatus 104, 105, 106, 107, the participating supply voltage or the participating supply current (loop current) and in the calling state of each of the participating devices 104, 105 are decreased. , 106, 107, the call voltage is decreased. But also, it can only materialize one of the last mentioned measures, for example, only the decrease of the loop current. Correspondingly, the device for decreasing the remote power supply of the participating devices 104, 105, 106, 107 can be formed by a device for lowering the supply voltage of the participant and / or the current of the participant, or by means of a device for decreasing the call voltage and / or the call current. You can also think of a combination of the aforementioned devices. With this, it is possible to reduce the given value of the call voltage by, for example, 10% for a wake-up call of a participating end device. The call function with this, does not change or only slightly. The case may be presented that during this phase of the power reduction of the call alarm sounds lower, but for which for the preponderant operating time in which only an average activity reigns, despite the relatively remote power supply voltage low, the total voltage of the alarm clock is present.

The reduction of the power supplied at a distance can be carried out with the help of a regulation loop in a predetermined manner corresponding to the limit value of the power supply of the local part 120. The decrease in the power supplied at a distance through the participating ducts 131 can be carried out in stages in digital or analogous form, where after each step of the power reduction, the power take-up of the local part 120 is compared to the predetermined limit value and when the limit value is passed downwards the decrease is finished. The determination of the pre-determined limit value can, for example, be carried out by means of a comparator which monitors a voltage drop proportional to the remote supply current and communicates an overshoot of a corresponding threshold as a surpass of the limit value of the power take-off. The device for decreasing the power supplied at a distance can therefore include, depending on the surrounding technical connection field, a digital control loop or an analogous control loop.

In figure 6, a communication transmission system is shown with an official part constructed as a partial power device 206 with a number M greater than or equal to 1 (1, 2, 3, ...) of official cutting positions and a part local 201 constructed as a partial feeding device with an equal or greater number N (1, 2, 3, ...) of partial cutting positions N, in which participating end devices are connected which are not shown. The maximum number of participating end apparatuses is in this case of N. In broadband data transmission, for example, only a single participating end device can be provided which is formed by a broadband transmission unit (N = 1), which has a vacuum state as well as an active state. Usually in non-concentrated facilities, it is M = N and with concentrated facilities N < N. The official part 206 and the local part 201 belong to a pre-field facility. as a local part, an exemplary embodiment of FIG. 6 of each part fed at a distance is understood, which contains an analogous or digital cutting position between the transmission conduit and the participating conduits. A local part of that type can be realized within the framework of the invention not only in even gain system, but in comparable xDSL systems or similar systems. Correspondingly, it is the official part according to FIG. 6, the remote feeder part, in which each time there is an analogous or digital official cutoff position between the central telephone or data system and the transmission conduit. From the local part 101, N participant cutting positions are fed, where as previously mentioned, the number N can be predated at will and can be N = l. The power requirement depends on the number of participants N and the number of active participants. The local part 201 fed remotely by means of the remote power supply source 205, in turn feeds the participating end devices connected thereto, apparatuses that are not shown in figure 6. The source of remote power supply 205 is controllable by means of a control device 207 at its output voltage, where a measuring apparatus, preferably a current measuring apparatus 208 is provided for the determination of the power expenditure of the local part 201 and of the transmission conduit 202 and the output of the measuring apparatus 208 is connected to the control device 207. The current I caused by the voltage source of the remote supply 205 is measured and evaluated. According to the invention, on the official side, in a test step in the official feeder part 206, the use or power expenditure of the local part that is powered 201 and the loss of power in the transmission conduit 202 are obtained. and from this with the need for known power of the local feeder part 201, the power resistance existing between the official feeder part 206 and the local part 201 to be fed is calculated. The test step, it is preferably carried out at the beginning of the operation during the high operation of the remote supply voltage but it can also be carried out at other times in case the need produces a subsequent adjustment. The local part belonging to an official part can already have been accurately measured after its manufacture or from another annex, so that its need for power can be considered as known. From the results of the measurement it is possible to calculate the actual driving resistance, which in many cases will fall below the maximum expected resistance, by an auxiliary intake of the known power requirement. Firstly, a test voltage UP is set, which is generally lower than the subsequently established supply voltage at a distance. In figure 8, the substitution image is represented for this process by means of which it can be seen more clearly. An IP test current is measured with the current measuring apparatus 208 and hence the driving resistance RL of the transmission conduit is calculated. The power output PR of the partial device to be supplied, from the local part 201, is subtracted from the power supplied in the transmission conduit 202 and from this the conduction resistance is calculated. Í? .L = a ... (formula 1) PR ... known power draw of the partial device to be fed in this example from the local part during the test step. In addition, depending on the conductive resistance RL and the operating state of the local part 201, the necessary distance power supply voltage is obtained and the voltage supply source 205 is set to the corresponding value UF. The operating state in this way is set by the number N of the active participating apparatuses, but can also be determined in another way.

UpßUn (Formula 2) UR ... Minimum operating voltage for the local part Pst ... Local power output on the PRI vacuum stage ... Maximum power consumption of the first active device (including the active circuit in the local part.

PRX ... Maximum power expenditure of each participating device that becomes active next. μR ... Degree of efficiency of the DC voltage converter in the local part. N ... Number of active participants. The value obtained from the remote supply voltage UF is fed as a nominal value to a regulating amplifier within the control device 207, with which the source of remote power supply 205 is regulated to the value obtained from the supply voltage a distance. Any analogue or digital regulation procedure is applicable for this purpose. In particular, different voltage steps can be adjusted by means of a digital potentiometer. The remote supply voltage can also be adjusted in a similar way. If the participant activity is varied, then the voltage supply obtained and established, is raised or lowered depending on the operating states of the participating drivers or the participating devices.

The official part 206 or the local part 201, each time presents at least one detector not shown to detect the operating status of the participant ducts, where the official part 206 is in conjunction with the local part 201 by means of a transmission unit of data. The outputs of at least one detector or of the data transmission unit are linked to the control device 207. Via the data transmitting unit, data are interchangeable between the local part and the official part. In the local part 201, there is provided a detector not shown to detect the operating status of the participating drivers, which detects a participant loop for example by the removal or application of a participating handset and the variation of state by means of a channel data of the data transmitter unit of the official part 206, especially in which number these have been registered. In existing official parts, detectors of this type already exist, and can therefore find application for the method according to the invention. With this, the individual operating states can be captured by the existing sensors and the data transmitter unit. In the vacuum operation in which all the participating apparatuses are inactive, a vacuum operating voltage is established that allows a supply of the local part 201. The current at rest of the local part is approximately constant. If a call is now fed from a participant, then this operating state in the official part 206 is detected by means of the detectors that are there and at this operating state a specific increase in the remote supply voltage is automatically coordinated, so that the control device 207 generates a corresponding signal and that of the remote power supply voltage 205. The remote power supply voltage is raised or lowered depending on the number of participants by stages, where in passing from a state of vacuum to a state with an active participant or vice versa, a higher voltage stage is provided compared to the same voltage stages. This occurs from the circuits deactivated in the idle state of the local part, which in the activation of the first participant come into operation and therefore cooperate correspondingly for the power expenditure. In long participant drivers, the remote power supply voltage necessary for the correct operation maintenance varies with the additional activation of a single participating device, only to a limited extent. Therefore, it is advantageous to perform the lifting or lowering in a voltage step as the number of active participants grows or decreases by predetermined numbers of participants. Thus, the remote power supply can, for example, switch one step higher while three other participants have entered into activity. The increase of the remote power supply voltage is related to a delay time, especially when to avoid the disturbance of the transmission of data during the passage from one operating state to the next, the remote power supply is switched by means of a transition function, for example, descendant sine. But since the call power has already been detected in the official part, the remote power supply voltage can be raised to a value still before the beginning of a real call to which that operating state corresponds, thus it prevents you from reaching a narrow power step. The abandonment or separation of a participant can be recorded in the official part, when the variation of state is communicated by means of the detectors provided in the local part and by means of the transmission unit to the official part, where the necessary feeding current for the participant, first after a certain delay it becomes available. This is determined because after the remote power supply coordinated to the corresponding operating state in the local part, it must already be at its full height and only then the power supply for the participating device has to be prepared. But, this way of proceeding is only one of many possibilities, in the way how the current operating state can be detected. Exactly as in the increase of activity it is reached an elevation of the tension of feeding at a distance, with the decrease in activity of the participant, the tension of feeding at a distance is diminished. Figure 7 shows by means of four transmission conductors of different length, the voltage stages or steps that are presented for the remote supply voltage, where each time a crossed voltage socket is indicated with an increasing removal of the part local 201 from the official part 206. The voltage stage or step presented to the left in figure 7, is sufficient for a local part with short conduit in as much, that the voltage step indicated totally to the right in reason of its greater driving, has a significantly higher socket voltage representing the loss of power in the transmission conductor. The vacuum state of the local part 201 is indicated by the step 0, in which different circuits of the local part are deactivated. Therefore, the increase in activity in the first participant (step 1) is accompanied by an unequally stronger increase in the power supply at a distance than, which is the case in the other steps 2, 3 ... X At each operating state with 0, 1, ... N active participants, an exactly defined voltage value UO, Ul, U2 ... UX is coordinated. In the exemplary embodiment according to FIG. 7, the remote supply voltage is set to its highest value by eight active participants. The voltage value UO corresponds to that value, which has been adjusted in the case of remote operation by obtaining the resistance of the driver with the method according to the invention. In many countries, it is the taking of power of the local part approximately equal with power call, the number of the different cases in a system with N participants is then N + l as shown in figure 7. With changing power take-off values , a finer division can be found by the steps of the remote power supply voltage. The phasing of the remote supply voltage can be done in any way, so that in simple systems only two or three remote supply voltage values can be made available, where a first value, for example, can be made available. determine for an average load and a second value for a tip load.

In order to avoid a potential underfeeding of the local part, a voltage comparator can be provided in the local part, which monitors the lower permissible limit value of the remote supply voltage and by being below this lower value by means of the unit transmitter asks for an increase in the remote power supply voltage. Figure 9 shows an example of a broadband transmission facility (N = l) fed from an official part, which essentially only has a vacuum running state "0" and an active state "1" therefore , only two voltage values of the remote supply voltage have to be set. In the diagram, the voltage values are given for two different distances between the official part and the local part, to show the difference between short and long transmission conductors. Finally, statistical indications can be conducted by means of all the measured and calculated values, for variations caused by the aging of the transmission conductor can be monitored. In particular, the calculated values of the resistance of the conductor, which have been stored intermediate, can be valuable and evaluated by means of an evaluation facility 210. In this way, it is possible within the framework of the invention to also perform the local part as the partial feeding device and the official part of the pre-field device as the partial device to be fed, where the operating state of the official part to be fed is determined and by means of the transmission conductor is conducted to the part local feeder. The remote supply voltage can be lowered or raised preferably in steps depending on the state of operation of the official state, where when going from a state of idling to a state that is declared as active or vice versa, a step of higher voltage compared to equal voltage steps. As an example for a local part, on which a remote power supply of the official part is made, consider a broadband data transmission unit. Without limiting the general thinking of the invention, this form of remote power supply is therefore given because, it is applicable more frequently while, that basically also from the local part torque gain system, it can be powered from a distance, but this is rarely the case. The official part of the broadband transmission unit has, for example, a disconnected state, an idle state as well as an active state. The voltage of remote feeding, is done in the same way as already described above. After a test step in which the power expenditure of the transmitting conductor and of the official part is set, the resistance of the conductor can be obtained from the need for known power of the official part (see formula 1). The necessary remote supply voltage is obtained correspondingly to the operating state of the official part and the source or sources of remote power supply from the local part to the corresponding value is adjusted. The partial device to be fed in this example, the official part each time presents a detector for detecting the operating state of the official part, and the local feeder part is in conjunction with the official part to be fed by means of a data transmission unit, so that by means of the unit, the operating status of the official part is communicable to the local part.

Claims

NOVELTY OF THE INVENTION. Having described the invention as above, property is claimed as contained in the following: CLAIMS. 1. Procedure for the remote feeding of a local part joined by means of a transmission conductor to the official part of a pre-field device of a communication transmission system, to which multiple participating conductors are connected, where the The local part is fed remotely with a source of remote power supply provided in the official part by means of which the participating apparatuses connected to the partial conductors are preferably fed by means of partial cutting positions, characterized in that the power supply from the local part is measured continuously and when a predetermined value of the power take-off is exceeded, at least for a part of the activated or active participating devices, the power supplied at a distance by means of the partial conductors is decreased. Method according to claim 1, characterized in that the power supply of the local part is measured continuously by means of the remote supply current flowing through the transmission conductor. 3. Method according to claim 2, characterized in that when a predetermined distance supply current is exceeded depending on the current activity states of the participating devices, a reduction of the applied voltage or current is produced, for the maintenance of these states on the participating devices, at a predetermined value. 4 Procedure according to the claim 3 characterized in that in the disconnected or switched-off state of each participant apparatus the supply voltage of the participant and / or the power supply of the participant is decreased. Method according to claim 3 or 4, characterized in that in the calling state of each participating device the call voltage and / or the call current is decreased. Method according to one of claims 1 to 5, characterized in that the decrease in the power supplied at a distance is carried out by steps, where after each step of the decrease in power the power supply of the local part is compared with the predetermined limit value and when the limit value is passed down, the decrease is terminated. Method according to one of the claims 1 to 6, characterized in that the stepless reduction of the power supplied at a distance takes place by means of a closed analogue control loop. 8. Communication transmission system with an official part, with a source of remote power supply, a local part powered remotely by means of the transmission conductor and in the local part, participating devices connected by means of participating drivers and under intermediate switching of the participating cutting sites, characterized in that in the local part there is provided a device for the determination of the power supply and a device for decreasing the power supplied at a distance of the participating devices and the device for the reduction is controllable by means of a control unit connected to the device for the determination of the power supply. 9. Communication transmission system according to claim 8, characterized in that the device for the determination of the power take-off is formed by a current measuring device for measuring the current supplied at a distance. 10. Communication transmission system according to claim 8 or 9, characterized in that the device for decreasing the power supplied at a distance of the participating end devices is formed by a device for reducing the voltage supplied to the participants and / or the current to the participants. 11. Communication transmission system according to claim 9 or 10, characterized in that the device for decreasing the power supplied at a distance of the participating end devices is formed by a device for lowering the call voltage and / or the call current. 12. Communications transmission system according to one of claims 8 to 11, characterized in that the device for decreasing the power supplied at a distance includes a digital regulation circuit. 13. Communication transmission system according to one of claims 8 to 12, characterized in that the device for decreasing the power supplied at a distance includes an analogous regulation circuit. 14. Procedure for the remote feeding of a local part connected by means of a transmission conductor with the official part of a pre-field device, of a communication transmission system in which multiple participating devices are connected, by means of of participating conductors, where the local part is remotely powered with a source of remote power supply provided in the official part, characterized in that the current operating status of the participating conduits is continuously detected in the official part or in the local part and the operating state detected each time is coordinated to a remote supply voltage, which corresponds to the current power requirement of the local part powered remotely and of the connected participating conductors, and the source of remote power supply is adjusts to the coordinate voltage value. 15. Method according to claim 14, characterized in that several operating states of the participating conductors are composed of a group to which a remote supply voltage is coordinated. Method according to claim 14 or 15, characterized in that in the transition from one operating state to the next, the remote supply voltage is switched by means of a transition function. Method according to claim 14, 15 or 16, characterized in that the remote supply voltage is raised or lowered depending on the number of participants in equal voltage steps, where on passing from the operating state of vacuum operation to a participant or vice versa, a higher voltage step is provided with respect to equal voltage steps. 18. Communication transmission system with an official part of a pre-field installation, a source of remote power supply, and a local part powered remotely by means of a transmission conductor, local part to which they are connected the participating apparatuses, where the official part or the local part presents at least one detector detector to detect the operating status of the participating drivers and the official part is linked to the local part by means of a data transmitting unit, characterized in that the Remote power supply source is remotely controllable at its output voltage where the remote power supply source is connected to the control input of a control unit, the control unit which is connected to the output of when less a detector for detecting the operating state in the official part and is connected to the data transmission unit. 19. Communication transmission system according to claim 18, with a DC voltage converter preferably including a transformer converter, which converts the voltage of a remote power supply source connectable into the official part, into the transmission conduit and with this it feeds the participating end devices connected in the local part, a monitoring device being provided in the local part, with which the current power requirement of the local part and of the connected end devices connected to it is determined, and where the source of remote power supply in the official part by means of the monitoring device is controllable depending on the need for power determined by means of a transmission device connected to the transmission conductor and the supply voltage necessary for the Current power requirement is adjusted in the official part, character curly because an accumulator is connectable by means of a controllable switching to a power input of the DC voltage converter, where at least one of the connections of the accumulator is connected by means of a rectifier element contained in a load branch given the case with the intermediate connection of another rectifying element with the veins of the transmission conductor, and the control output of the monitoring device is connected to the controllable control input, where the voltage in the accumulator is monitored continuously and the accumulator is charged in the case of a loss of load by means of the source of remote power supply existing in the official part. Switching arrangement according to claim 19, characterized in that the supply input of the DC voltage converter is connected to the veins of the transmission line by means of at least one rectifier element. Switching arrangement according to claim 19 or 20, characterized in that the load branch is formed of a series circuit of a rectifier element and a resistor. Switching arrangement according to one of claims 19, 20 or 21, characterized in that the controllable switching is formed by an FET. Switching arrangement according to one of Claims 19 to 22, characterized in that the connections of the accumulator are connected to the inputs of a voltage comparator whose output is connected to the transmission unit, by means of which the voltage of the The supply voltage source in the official part is adjusted to a higher load voltage, where when passing down a lower voltage threshold of the comparator, the power supply voltage to the voltage of the accumulator is established by the voltage of the accumulator. higher load and then when exceeding a higher threshold of the comparator voltage, it returns to the value previously established. 24. Switch arrangement according to claim 23, characterized in that the voltage in the accumulator is monitored continuously and the accumulator in the case of a loss of load is charged both by means of the supply voltage source remote in the part until the high charge voltage in the accumulator is reached and when the high load voltage is reached, the remote supply voltage is returned to its previously established value and the power requirement of the participating end devices powered by the local part , it is continuously measured and when there is a power supply that is not sufficient for the local part, the controllable switching is closed and the accumulator is connected to the supply input of the DC voltage converter, so that it is connected to the voltage converter continuous, where an increase in the supply voltage is also allowed as corresponds to the need of current tension. 25. Procedure for remote feeding of a local part connected with the official part of a pre-field device of a communication transmission system, local part to which, for example, participating drivers are connected to one or more participating extreme devices, where the local part or the official part is either the partial feeding device or the partial device to be fed and vice versa and where a The remote power supply source provided in the partial power supply device is supplied at a distance with the partial device to be powered, characterized in that in a test step, the partial power supply of the partial power supply to the power supply is obtained in the partial power supply device. of the loss of power of the transmitting conductor and from this, in the need of known power of the device to be fed, the power resistance between the partial feeding device and the partial device to be fed is calculated, and depending on the calculated power resistance and the operating status of the device that has to be fed, the necessary remote power supply is obtained and the source of the remote power supply is adjusted to the corresponding value. 26. Method according to claim 25, characterized in that the partial device to be fed is the local part and the feeding device is the official part, where the power expenditure of the local part to be fed is determined by obtaining of the number of active participants. Method according to claim 26, characterized in that the distance supply voltage obtained and established is raised or lowered depending on the operating states of the participating drivers or participating devices. Method according to claim 27, characterized by the remote feeding voltage is raised or lowered by steps depending on the number of participants, where when going from a state of idling to a state with an active participant or vice versa , a higher voltage step is provided compared to those preferably equal. 29. Method according to claim 28, characterized in that the increase in the decrease in a voltage step is made as the number of active participants increases or decreases in a predetermined number of participants. Method according to claim 29, characterized in that the partial device to be fed is the official part and the partial supplying device is the local part, where the operating state of the official part to be fed is determined and transmits by means of the transmission conduit to the local feeder part. 31. Method according to claim 29, characterized in that the distance supply voltage obtained and established is raised or lowered depending on the operating state of the official part. Method according to claim 31, characterized in that the remote supply voltage is raised or lowered by steps, depending on the operating state of the official part. Method according to one of the preceding claims, characterized in that the value obtained from the remote supply voltage is fed to a regulating amplifier as a nominal value with which the remote supply voltage source is regulated. 34. Method according to one of the preceding claims, characterized in that, when a state of operation is passed, the remote supply voltage is switched to the next by means of a step function. 35. Method according to one of the preceding claims, characterized in that the test step is performed each time at the beginning of the operation during the high setting of the remote supply voltage. 36. Method according to one of the preceding claims, characterized in that the different voltage steps are adjusted by an analogous or digital regulation method. 37. Method according to claim 36, characterized in that the different voltage steps are adjusted by means of a digital potentiometer. 38. Method according to the preceding claims, characterized in that the calculated values of the conductor resistance are stored intermediately and are obtainable by means of a maintenance device. 39. communication transmission system with a partial power supply device, including a source of remote power supply, and with a partial device to be fed by means of a transmission conductor, where the source of remote power supply it is controllable in its output voltage by means of a control device, and where a measuring apparatus is preferably provided by a current measuring apparatus for determining the power expenditure of the partial device to be fed and of the transmission conductor and the The output of the measuring device is connected to the control device, characterized in that the partial power supply device or the partial device to be powered has at least one sensor to detect the operating status of the participating ducts or of the participating end devices, and the feeder device is connected with the device that has feeding by means of a data transmitting unit and preferably the output of at least one detector or the data transmitting unit is connected to the control device. 40. Transmission system according to claim 39, characterized in that the partial feeding device is the official part and the partial device to be fed is the local part. 41. Transmission system according to claim 40, characterized in that the partial feeding device is the local part and the partial device to be fed is the official part. 42. Transmission system according to claim 39, 40 or 41, characterized in that the control device is linked to a maintenance or monitoring facility, in which the calculated values of the resistance of the conductor are stored intermediate and are questionable.