FI58415B - UTRUSTNING FOER INFORMATIONSOEVERFOERING SAERSKILT VID RADIOLAENKSYSTEM - Google Patents

Description

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Patent · And Registry Board (44) NlhttvUrtp ™ |. heard »am» date—

Patent · och refisterstyrelsen Anvöktn Utlt (d oeh utl.tkrlfttn publlcurad 30.09 * δο (32) (33) (31) Requested «tuolkuu * -B« jW priorlttt 22.10.71

Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) P 2152721.9 (71) Siemens Aktiengesellschaft, Berlin / Munchen, DE; Wittelsbacherplatz 2, 8 Munchen 2, Federal Republic of Germany-Förbundsrepubliken Tyskland (DE) (72) Klaus Boshold, Eichenau, Federal Republic of Germany-Förbundsrepubliken

Tyskland (DE) (7U) Berggren Oy Ab (5U) Device for transmitting information, especially in a radio link system - Utrustning för informationsöverföring, särskilt vid radiolänk- system

The invention relates to a device for transmitting information electronically with a high degree of security, in particular in a radio link system in which the device has several transmission channels to which two backup transmission channels are interchangeably connected and in which the device further has a an arranged interference detection circuit, the interpretation result of which is transmitted by a signal transmitter to the transmission side of the corresponding relay department and there, via the signal receiver, with its associated interpretation and control connections, provides a backup channel connection.

Such transmission systems with spare or replacement channels are already known from DE 1 047 272, 1 269 205 and 1 276 762. At that time, instead of the usual replacement switching technique with one spare channel n per operating channel, two spare channels n are now allocated. for. It is still thought to use the ratio of n as well. In this case, however, the essential switching technology corresponds to the switching technology mentioned in said advertisements. In addition, reference should be made to DE-A-1 924 678.

In hitherto known systems of this kind, as many spare channels require as much information per operating channel as there are spare channels. If, for example, it is assumed that the transmission system has six operating channels, the amount of information required according to previous methods can no longer be matched to the transmission path used for signaling. The available way to use a fault message instead of the dual audio AC electrification systems hitherto used to switch the compensation circuit, where one WT channel is required per operating channel, could be done using a special code usage similar to the usual one in remote control technology. m ", e.g. in the form of selecting two frequency groups with five signal frequencies each. However, as the studies underlying the invention have shown, this results in particularly high instrument costs, which are already required for relatively few transmission channels, but which increase relatively little with the increasing number of access channels.

The object of the invention is to present a solution which makes it possible to keep the costs low for the case of a relatively few operating channels of interest.

In order to achieve this object, the invention is characterized in that for each operating transmission channel there is a criterion channel arranged on the interference notification path from the transmission part reception point to the transmission point with a signal transmitter and a signal receiver with interpretation circuits. the output voltages to the input of the first, second interpreter, and part of the third interpreter connected in parallel with the amplitude limiter, the frequency discriminator and the series of the first and second interpreters, the criterion channel operating at three different signal frequencies, the middle operating at 3 58415 as an operating criterion for the transmission channel included in this criterion channel, and for which signal frequencies the function of the lowest and highest frequencies is to act as a switching criterion for their own backup transmission channel and are transmitted when a certain backup transmission channel needs to be switched on the transmission side, and the frequency discriminator has two maximum amplitude values as accurately as possible at said upper and lowest signal frequency reference.

According to a preferred embodiment of the arrangement according to the invention, a means is provided which, when all signal frequencies are left out of a criterion channel or simultaneously receive more than one signal frequency, in particular several switching frequencies and / or only one of the signal frequencies is received or normal level conditions are restored.

Another preferred embodiment of the invention is characterized in that when signals are received simultaneously at the frequency of the normal operation case and the second frequency of the replacement case, the corresponding spare channel connection is provided on the transmission side, and on the receiving side the

The invention will now be described in more detail with reference to an exemplary embodiment, the essential details of which are shown in the drawing.

In the drawing, Fig. 1 is a block diagram of a radio link system comprising three radio link components, Fig. 2 is a block diagram showing an overview of the design of separate criterion transmitters and receivers, and Fig. 3 is a diagram showing an operation in the criterion receiver of Fig. 2.

. * 58415

The embodiment according to Figure 1 is based on a radio link connection on six radio frequency channels, four of which must act as usage channels and two as spare or replacement channels. In Figure 1, the four operating channels are marked I, II, III, IV. The spare channels are marked V and VI. The entire radio link connection between the terminals is divided into switching parts which are connected to each other at the switching points. Figure 1 shows two connection points SS1 and SS2, whereby the connection point SS1 connects the connection parts, vast, the transfer parts SA1 and SA2 and the connection point SS2 the connection part, vast, the transfer part SA2 and SA3. The switching part can extend over several radio links and can also be formed in whole or in part from cable gaps, i.e. cable gaps.

For example, 960 telephone conversations can be transmitted over one radio program via a radio frequency channel. For telephone transmission, 960 call channels are usually bundled according to e.g. a frequency division method or a time division method, so that a baseband is obtained. Such a baseband would have, for example, when bundled with a frequency division, a frequency dimension of about 50 kHz to 4000 kHz. TV transmission in this baseband would generally have a range of 0.01-5000 kHz. The radio link intervals bring this baseband together with the pilot oscillation, e.g. 8.5 MHz, to an intermediate frequency range, e.g. 70 MHz and with another intermediate frequency conversion to the radio frequency range intended for the actual transmission, e.g. 2 GHz, 4 GHz, 6 GHz or 8 GHz.

Figure 1 shows only the second transmission path of the radio link connection. The second transmission path, which is necessary for the transmission of a telephone conversation in the opposite direction, is constructed in exactly the same way. The six radio frequency bands are radiated and received, for example, in each case via a single antenna. At each switching point, the received radio frequency bands are shared in the filter W and combined for transmission. The transmission of radio frequency oscillations to the intermediate frequency range or possibly also to the baseband range takes place, for example, with the receiver ME. The transmission of the baseband signals, i.e. the corresponding intermediate frequency signals, takes place in the radio frequency range via the transmitter MS. Arranged switching switches NE on the receiving side and switching switching devices NS on the transmitting side are arranged between the receivers and the transmitters. They confirm that in each case in a predetermined manner 5,554,155, e.g. in the four undamaged operating channels I-IV, the outputs a1-a4 are connected to the transmission inputs c1-c4 by means of the through-connections b1-b4. If, for example, in the switching section SA2, the transmission channel III is omitted, instead the corresponding replacement channel section V becomes, because due to corresponding control and switching events in NS the input b3 becomes connected to the transmission input c5 and in NE the connection a3-b3 becomes switched a5-b3. In the same way, the second compensation channel VI can also be matched.

In the exemplary embodiment, there is a criterion channel reserved per usage channel. The criterion channel derives the switching part corresponding to its criterion, e.g.

SA2 at the respective reception point, in the usual way from the signal of the respective operating channel. For this purpose, the output magnitude is mostly the level of pilot oscillation and / or, when switching to the intermediate frequency range, the signal level and possibly the interference level in some special interpretation channel taken from the transmitter to the receiver and possibly via switching points SS to the nearest switching section. If, on the basis of the usual interpretation connections, one of the operating channels is detected in the NE, e.g.

The requirement for the substitution circuit III, i.e. this switching is started manually in a known manner, causes the criterion transmitter to transmit the corresponding signal frequency to the criterion channel belonging to the channel III. The corresponding criterion receiver KE then wakes up at the transmission point of the switching section and provides a connection exchange arrangement from III via the switching field NS, e.g. c5, a5, b3.

It is now characteristic of the invention that each of the criterion channels is operated on two spare channels with three different frequency signal signals and, as a result, each of the criterion transmitters KS can be switched to three different frequencies in a single criterion channel. One of the three signal frequencies is a hallmark of the normal use case, while the other signal frequencies each belong to their replacement channel. In this way, both greater certainty about the unintentional pulling of the backup connection is obtained, and at the same time the control of separate criterion channels is achieved. The separate criterion channels are assembled, as can be seen from Figure 1, e.g. according to the frequency division principle, as a transmission channel. The bandwidth required for this in the structure according to the invention is mostly even smaller than that of a single ordinary telephone channel 6 58415 adapted for the transmission of frequencies between 0.3 and 3.4 kHz. As a result, either a separate telephone cable for a reverse link connection (not shown in Figure 1) or the most common official telephone device is suitable for the bundled criteria channels as a transmission path. A special wired or radio connection can also be used for this purpose.

In the device according to the invention, the only criterion transmitter is formed, e.g. KS1 in Fig. 2 by a constant frequency oscillator 4 which oscillates at the frequency fo. The frequency value can be, for example, 1.2 kHz. The control line 1 has an oscillator 4, for example, can be switched for the frequency fl = fo - 60 Hz and for the control line 2 for the frequency f2 = fo + 60 Hz. The changeover to f1 means, for example, that the corresponding drive channel at the switching point SS1 must be connected to the backup channel V, while the changeover connection to the frequency f2 in the oscillator 4 at the switching point SS1 means the connection to the backup channel VI. The flow signal of the oscillator V is filtered in order to avoid conversion interference effects in other criterion channels, e.g. by means of harmonics, i.e. by side waves, by a bandpass filter 5 and a criterion transmission path, e.g. KEre, is passed. The individual criterion receiver KE has a filter at its input, which in each case only passes through the frequency band in which the signal frequencies of the criterion channel belonging to the criterion receiver are located. As a result, it may sometimes be permissible to omit the filters 5 from the criterion transmitters KS in order to save the filters and shorten the signal travel time. The level of the output signal of the filter 6 is raised in the amplifier 7 to the necessary extent and then led to the actual interpretation circuit. Here, first, there is an amplitude limiter 8, to which a frequency discriminator 9 is connected, the two amplitude maxima of which remain as close as possible to the nominal values f1 and f2 when f1 and f2 are above, respectively, below fo. The positive, resp, negative supply voltage of the discriminator 9 is taken from the interpretation circuits 10 and 11 and is therefore available at the outputs 1, 2 of KE1 just as on the transmission side. With a relatively wide signal interpreter 12, e.g. a highly attenuated resonant circuit, a second signal is obtained in parallel with 8, 9, 10 and 11. This signal always occurs as long as only one of the oscillations fl, fo, f2 occurs. As a result, there is also control in the absence of fl and f2, i.e. in undisturbed operation.

Thus, it is possible to use the signal quantity 3 taken from 12 as additional verification. Namely, if, due to interference, signal 3 is outside the normal level range of 7 58415, the criterion can be used to maintain the switching situation prior to interference. In addition, the closing of the switching situation can occur due to external interference in the signal combination 1 + 2, resp. 1 + 2 + 3 performances.

Also shown in Fig. 3 is a discriminator identification line 9, where f denotes the running frequency and U denotes the forward amplitude of the discriminator.

The abscissa then has the zero line of the ordinate. Frequency band Afl, resp. Inside Af2 is thus obtained from 10, resp. ll in each case criterion 1, resp. 2 and criterion 3 is always present, in the absence of fl vast, f2 the supply voltage is zero and only signal 3 exists.

It is recommended to make sure that the draw time of 12 is chosen to be considerably shorter, e.g. by a factor of 2 than 8, 9, 10 resp. 8, 9, 11 to ensure said safety against unwanted switching.

Instead of the discriminator 9, it is also possible to adapt selective signal receivers which pull with fl, resp. with f2 and develop quantities 1, 2, 3.

The criterion channels can also be routed backwards, also via the connection point SS of the separate connection parts SA, respectively, to the next connection part.

The frequency division f1, fo, f2 selected in the embodiment also has the advantage that the discriminator can be more widely matched to the frequency band, whereby its stabilization time can be kept shorter.

Claims (5)

8 58415 1. An apparatus for transmitting information electronically with a high degree of security, in particular a radio link in a system comprising a plurality of transmission channels interchangeably connected to two backup transmission channels and further comprising a monitoring device and a switching device enabling the interrupted transmission channel to be replaced by a free backup channel. an interference detection circuit is arranged at the receiving part of the relay part, the interpretation result of which is transmitted by a signal transmitter to the transmission side of the respective relay section and provides a backup channel connection via the signal receiver, associated interpretation and control connections, characterized in that for each operating channel III, II, is a criterion channel arranged on the path of the interference from the receiving point of the relay part to the transmission point, with a signal transmitter (KS) and a signal receiver (KE) with its interpretation circuits, j then said interpretation circuit consists partly of an amplitude limiter (8) and then a connected frequency discriminator (9), both outputs of which are connected to the input of the first and second interpreting devices (10, 11) of the output voltages of the discriminator (9), and partly of a third interpreting device (12), connected in parallel with a series connection of an amplitude limiter (8), a frequency discriminator (9) and a first and a second interpreting device (10, 11), and wherein the criterion channel operates at three different signal frequencies, the middle of which is transmitted in normal operation and serves as a correct operation criterion for this criterion channel , and of which signal frequencies the lowest (f1) and highest (f2) frequencies each serve as a switching criterion for their own backup transmission channel and are transmitted when a certain backup transmission channel (V, VI) has to be connected on the transmission side, and the frequency discriminator has two the maximum value of the amplitude, which are as close as possible to the reference values of said highest and lowest signal frequencies (fl, f2). Device according to Claim 1, characterized in that a means is provided which, when all signal frequencies are omitted from one of the criteria channels or more than one signal frequency is received at the same time, in particular several switching frequencies, and / or deviates from the normal operating level, 9 58415 II, III, IV) and the backup transmission channels (V, VI) by blocking the operating situation prior to this disturbance until again only one of the signal frequencies is received or normal level conditions are restored. Device according to Claim 2, characterized in that when signals are received simultaneously at the frequency of the normal operation case and the frequency of the substitution switching case, the corresponding spare channel connection is provided on the transmission side, and the reception side switching the backup channel to its free space. 1. Utrustning för överföring av elektrik väg med hög tillförlitlighet, särskilt vid radiolänksystem, hos vilken utrustning flera driftöverföringskanaler är anordnade, account vilka tvä reserveöföringskanaler on utbyttbart tillordnade, och hostken in addition to the use of a drift channel with a redundancy channel, the same information is used as a means of transmitting the signal to the redundancy channel, and The signaling means may also be used as a signaling device for the transmission of a signaling channel and the signaling channel of the signaling channel (I, II, III, IV) according to the criteria. (KS) and signal signaling (KE) with the signaling power and the signaling power of the signaling power supply account with the signaling power of the transmission signal section, the color of the signaling power of the best value (8) , which may be used as a means of communication with respect to the second and third parties (10,11) for non-discrimination (9) as a result, and with the third party (12) 8), frequency discriminator (9)