DE1216347C2 - Method and arrangement for transmitting a sequence of information over a unidirectional, failure-prone transmission path with message signal transmission in blocks - Google Patents

Description

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partial repetition after a certain prerequisite it should be noted that one against a first co-writing is distributed over the two transmission channels. The encoding of information that is mirror-inverted, the transmitter and the receiver are each duplicated. Encoding is required for its subsequent repetition, and other devices are known (German patent specification 1135 949).
The invention relates to a method of repetition. This method of time-staggered transmission of a sequence of individual items cannot be used if there is only one single item of excess information in a telegram chain via a transmission path. unidirectional, failure-prone transmission

The other known methods are in this respect \ gone with block-wise sending of messages elaborate and therefore for the given task io zelinformation and its repetition in one not useful as an additional single-error-recognizing code with start and end marking directions on the transmitter side necessary for the creation of control characters.

are. It is a repetition of the incorrectly received object of the invention to provide such a method

Characters at the request of the receiving point must be specified, in which the information transmission without

not feasible via a transmission path. 15 Comparison by query with the highest possible

Finally, it should be mentioned that it is used in such a way that it is error-proof.

called "secured" or "error-detecting" This task is achieved in that encoder codes are also known. This is understood to mean a combined code for each individual piece of information, in which each coded character is a completely hanging data block (individual telegram) with 16 specific numbers of character and pause elements 20 equally long spaces, which has on ten an error is immediately detectable, the first four places the partial information of a if the received code combination has a different start character for the individual telegram, on the number of character and pause elements. next eleven places twice the information content Such "secured" codes are, for example, the and one between the places for the information variations of a code 1 or 2 from 5, or a 25 mation content and its repetition arranged codes 1, 2, 3 from 7. In this list also includes test station, which is included by its occupancy or the options not mentioned, since non-occupancy to differentiate between signal or coding z. B. is used with two characters on five places message blocks, and the 16th place can be viewed as the end as three pauses on five characters for the individual telegram is unoccupied and that places. 30 all data blocks immediately after

Also known is a method of transferring each other, and that beginning and of commands by means of pulse code modulation in the remote end of this telegram chain through different Control or telecontrol systems (Siemens, remote control signal blocks as start and end characters marsystem Z, Cal description T 1810, October 1963). are marked like the contents of a single telegram In this remote control system, the entire 35 is constructed and also coded to detect errors. Message made up of two permanently related information items (Address and command). Different codes can be used for each information block mation part is in a separate data block in order to ensure the security of error-free transmission brought. The two data blocks are to be increased immediately. It has been shown that even joined together. They thus form a double 40 the repetition of the information certain overrun block, which is designated as a "sentence". Beginning and ending errors cannot be recognized. With a coding this data block is preceded by an initial character with time-staggered pulses, for example and a final character marks which occur among themselves that the synchronization of the disengagement Have differentiator. Likewise, occasionally synchronization errors can occur, the start and end characters differ 45 This time shift of the impulses is not from the long characters within the two but the information is falsified. Since the synchronous data blocks, so that a reliable synchronization error even when repeating the information in • Does not act openly in the same way in the remote control system Z under consideration, the repetition coincides beard is. The receiving-side evaluation devices of the first group of features and the transferred in-ability thus not recognizing whether the information is being caught incorrectly as being correct or not the final character or around a long value. Is used now for the repetition character of a data block. a different coding than for the first feature

Each individual data block is in itself a dual coded group, so both codings are changed by one and consists in the first part of a group or shift in different ways, and the Ver command identifier, a test step that can be detected in the shift error. Very over-sensed a “parity supplement” the number of different encryption steps added to even or odd, as well as ment, if a code user is required for the repetition complementary repetition of this first det, which becomes the code for the first feature part, group is built up in mirror image.

The remote control system Z is therefore not suitable for the transmission of the individual data blocks

for use on highly susceptible over- the known methods can be applied,

transmission paths, since the receivers connected in parallel, such as the representation of the individual im-

starting stations at any long step impulses and pauses through frequency shift keying,

would run and a correct synchronization. The invention is illustrated using the illustrations for

is not reliably guaranteed. In addition, with 65 an embodiment is explained, namely for a

this system enables the transmission of a total information time-staggered impulse procedure with the coding 1

mation from a variable long sequence of or 2 from 5.

Decimal digits not possible. A b b. 1 shows an overview of a whole part

5 6

gram chain. According to the invention, this is made up of data. The memory also contains the marking blocks for the individual pieces of information. medium for the initial and final characters. You begin with a first data block for the stimulus signal R , the electronic decimal start telegram switches, which contains characters which the digit switch A allows the markings of the memory B to run on the receiving-side device, with a start character according to their position in the row of digits, that for its special one through the connection matrix C for telegrams identification of three occupied pulse places group D , which consists of electronically from; it is followed by the feature groups for the markings, the telegram chain according to the initial character, which is used to distinguish it from the actual A b b. 1 forms. After the first transmission of the chain, the message content is encrypted differently than io, the assembly E causes it to be repeated. That this; In the example, a telegram is initially selected for the start character after module D in the variant of the 1-out-of-5 code, while it is in the form of DC pulse series, which in the IM message content in the following data blocks pulse converter UI in the suitable for transmission 2 out of 5 is encrypted. Between the first audio frequency pulses are converted.
Feature group and its repetition is still 15 A b b. 3 shows schematically the devices at which an impulse position is inserted for the receiving point on the receiving side. The incoming audio frequency signals code test can be assigned a pulse, are in the converter Uli again in direct current to additionally indicate that the coding for the pulse is converted and these are entered one after the other in initial characters in contrast to the following after the shift register SR . As soon as a content is encrypted with 1 out of 5. 20 data block is completely inserted, checks the

The following data blocks, each of which is preceded by a facility KPr, the registered characters on code start characters, convey the content of the correctness in each individual feature group. For actual news. In order to encrypt the correct telegram, a signal to the switchboard operator is selected as code 2 from 5 in the example; given for the terS. This stores the information repetition of the feature groups is thereupon from the shift register SR initially the same code memory Sp in the first and second messages only if the first feature group is accepted. From the example chosen and their repetition with one another in terms of content, it can be seen that agree with a synchronization error. For the correct order of characters Datendie for the first message in the position of blocks in the memory, makes the Dezimalstellenschalter can come to the second message corresponds DS 30, which by the initial message on the Bauspricht; their content is thus falsified. The group K is released. The final telegram repetition, however, in a different code blocks the decimal point switch, which is then reproduced, for example according to the Dar- checks whether all the incoming data blocks have been evaluated as the correct position for the third message. If this is the case, the synchronization errors will be recognized during the evaluation; in the case of 35 downstream devices, not shown, of the repeating group of the third message, the contents of the memory Sp are made to work in a mirror-inverted manner compared to the first transmission.

Code applied. In the case of a number of variants, if during the first submission of a part Codes, namely those whose first or gram chain individual locations in the memory as a result of the last pulse place is occupied, the synchronism is 40 faults in the transmission were not occupied, Errors already in the test for correctness of the code are recognized by repeating the whole parts, as it is filled up after the chain of programs in the event of a synchronism error. The passing on of the information or other direction of one of the corner impulses to the downstream facilities the code scheme falls out. then follows only at the end of the repetition. Will

A complete single telegram for the time- 45 not all gaps in the

staggered impulse transmission consists of 16 places of memory filled, so the receiving-side

for the impulses and breaks. For the start character, evaluation means moved to the basic position and on

of the individual telegram, three adjacent interference signals are triggered. In the practical case where

Spaces that are followed by a break are occupied in order to

The interference signal makes the existing

to draw. For the actual message content, the connection is disconnected and a dial tone is given,

and its repetition are chosen five places each. On details of the donor and receiving side

Taking into account the necessary break on the electronic equipment for the pulse generation

At the end of the individual telegram there is still a place where it can be stored, passed on and evaluated

at your disposal. 55 is omitted in the individual telegrams; the individual assemblies are

he in the example of Fig. 1 between the feature - with the known means for the impulse processing -

to realize groups either as an impulse or as a break.

classifies and is used to indicate the different The practice has shown that with the described Coding of these blocks - so the coding 1 procedure results in a very high transmission security 5 versus 2 out of 5 - can still be identified in a special way. On the donor side, the effort remains limited, nism moderately low, as special facilities for the

A b b. 2 shows a block diagram of the encoder formation of control and test characters for each

facilities. The message to be transmitted, e.g. temporary message and its activation after transmission

Rows of digits are entered into memory B. there would be no news. Equally dispensable

This can e.g. B. with a corresponding number 65 are the facilities of the known methods, the

by rotary switches, at whose outputs the repetition of disturbed only on request

the set digits and at the same time their transmitted characters and their correct classification

Initiate repetition marked in the specified coding in the entire telegram. _:

1 sheet of drawings

Claims (8)

1 2 Claims: fem they are received error-free when repeated. 1. Procedure for staggered transmission. 9. Arrangement for carrying out the perpetrator Sequence of items of information in a rens according to Claim 8, characterized in that Telegram chain via a one-way direction, 5 that other means only after the perfect one fault-prone transmission path with block-by-block storage of all information Send message of the individual information to initiate evaluation. and its repetition in an error recognition 10. Arrangement according to claim 9, characterized in that the code with start and end markings is provided, characterized in that on the transmitter side the evaluation means on the receiver side enter the basic for each individual item of information to move the compilation and to send a signal to the pending data block (single telegram) with 16 encoder positions if, after repetition, positions of the same length are created, the information sequence has an imperfect entry to the first four positions, the partial information is stored,
a start character for the individual telegram, on 15. the next eleven places twice the information mation content as well as one between the places
for the information content and its repetition arranged test station, which by an essential task in the information its occupancy or non-occupancy for sub-transmission is to recognize errors in the transmission of signal or message blocks development and incorrectly transmitted information, and the 16. Place as the end character for the individual telegram to be excluded from further evaluation and that all close. In wired systems, errors occurring immediately one after the other on data blocks are usually due to faults in the transmitted and the fact that the beginning and end of this telegram chain feed back this telegram chain by different means. The known transmission methods are signal blocks as start and end characters, therefore, often geared towards marking an error, which localize like the contents of an individual telegram in order to systematically structure recurring error telegrams and also to eliminate errors,
are recognizably coded. 30 When transmitting information about failure-prone 2. The method as claimed in claim 1, as a result of which there are new possibilities for errors in transmission paths indicates that for the groups of features one characterizes that randomly recorded interference pulses Different codes used in the data block falsify the message. In practical application will. this is the case with an information transfer ' 3. The method as claimed in claim 2, characterized in that radio paths are given, for example when moving indicates that the code for the feature telephone subscriber stations (vehicle stations) groups of information and for their re-establishment of a call connection in direct fetch is set up as a mirror image of the test station. Establish extension, and the desired part 4. The method according to any one of claims 1 subscriber number and other necessary data, such as up to 3, characterized in that the encryption 40, its own identifier, are transmitted on the radio path for transfer encryption according to variants of the point. There is less / 5 \ _T ,, ς ,. ,. Ti ₁ ,, - ,. on, a usually sporadic (") code occurs, where π = 2, 3, I, 4. _{locate the} ^ ^ > ^ _em procedure to find 5. The method according to any one of claims I that with little effort in the numerous to 4, characterized in that all of the transmitter stations in the vehicles are reliable Formation sequence ensures transmission of the information after a first transmission; then repeats automatically. Error in the identification of the calling station 6. The method according to claim 5, characterized in that a fee would be charged for a completely unmarked that the repetition of the sequence involved participant lead. of data blocks in whole or in part at the receiving end 50 For the secure transmission of information A wide variety of self-correcting options are already wise for a renewed identity comparison is used. Codes and inquiry procedures with repetition 7. The method according to any one of claims I of incorrectly received information parts known, to 6, characterized in that the impulses are used in all of these methods, the features (bits) are marked by frequency shift keying. 55 for a specific message block by 8. Arrangement for the implementation of the procedural test marks or groups of test marks see above rens according to one of claims 1 to 7, characterized in that an error of a single bit marked that the receiving-side evaluation can be reliably recognized. Solid medium for correction are provided that the received errors are the disturbed concerned Characteristics of each data block are repeated on the code 60 message characters. Necessary for a correctness and consistency of the content of such a procedure is that the receiving agency the of the first information characteristic group and their fault reports back to the transmitter station immediately and Check repetition and only cause the repetition of the character to be correct. After give known information in a memory, known bidirectional radio telegraphy process and that the possibly due to incorrect 65 ren with correction obtained by repetition Transmission of not stored information from disturbed telegraph characters are followed by two the automatic repetition of the sequence used and the transfer channels Data blocks are subsequently stored, so the information is transmitted and, if applicable, theirs