DE1487986A1 - Multi-frequency code signaling method - Google Patents

Description

STANDARD ELEKTRIK LORENZ AG

Delousing Stuttgart-Zuff "I 5 8 7

Hellmuth-Hirth-Str. 42

SEL / Reg. 11 294
H. Shoo - 5th

Multi-frequency code signaling method

The invention relates to a multi-frequency code signal method for telecommunications, in particular telephone exchanges, in which all information is transmitted in a testable code.

Multi-frequency code signaling methods with testable code are becoming common in telecommunications and, in particular, in telephone switching technology used, e.g. for the transmission of so-called hegist signs between exchanges. A special shape such a signal process is, for example, the so-called MFC forced run signal process. In order to ensure greater operational reliability, a multi-frequency code signal method is often used testable code, mostly a code of the type (m from η), is used.

With most of these methods, ten digit values (0 - 9) and various special characters have to be transmitted in coded form. A (2 out of 6) code is therefore often used in which fifteen code combinations are available, of which the code combinations 1 to 10 for the representation of digits and the remaining code combinations 11 to 15 for special characters to serve.

July 15, 1966

Gf / mg - 2 -

OWGlNAL INSPECTEO 909808/0650

Due to the sometimes very long delivery times, international Telecommunication connections there is a desire to give the signal to be carried out as quickly as possible. This is the hoof delay time and thus the waiting time of the calling subscriber and the unpaid occupancy time of expensive lines are kept as short as possible will. There is a requirement, the code, of every signal to be able to check for accuracy and the desire to be in proportion for the effort required for a testable code (number of frequencies) an optimally large number of possible code combinations to accomplish.

According to the invention, these demands and desires are particularly important advantageously met in that two code combinations are transmitted at the same time, of which the one in an (m out of n) code with χ possible code combinations and the other in an (m from ρ) code with χ + y possible Code combinations are shown that different frequencies are used for the two codes that with simultaneous transmission of a code combination of the former Codes with one of the χ code combinations of the second mentioned Codes has a separate meaning for the two pieces of information and that the simultaneous transmission of a code combination of the the first-mentioned code with one of the y code combinations of the second-mentioned code represents common information.

The method according to the invention not only creates a significantly faster signal transmission, but while maintaining the verifiability of the code of each received signal, the number of code combinations that can be represented is also significantly increased. There must be a total of η + ρ signal frequencies, but the number of items of information that can be represented in coded form is significantly higher than, for example, in a (m from (n + p)) code, which would require the same amount of frequencies.

BAD ORIGINAL 909808/0650

Another aspect of the invention for the transmission of subscriber call numbers and special identification provides that the digits of a subscriber number are paired with a code combination of the first-mentioned code and one of the χ code combinations of the second-mentioned code are transmitted, and that in the case of an odd number Subscriber number the last digit by the corresponding code combination of the first code and a certain of the y code combinations of the second code are transmitted.

This allows subscriber numbers with any number of digits transferred quickly.

To accelerate the transmission with a multi-frequency code signal method it is already known to omit the pauses between two consecutive pieces of information. According to the DAS 1 211 286 thereby becomes the problem of the ability to be separated successive identical information so resolved that The code character itself and a repeat character are sent alternately.

A further development of the invention for such a signaling method provides that the repetition character from a specific Cpde combination of the former and a specific one below the y code combinations of the second code will.

The invention is described below with the aid of the The table shown in the drawing is explained in more detail.

As an example it is assumed that it is the transfer of fiegisterzeichen (i.e. dialing information and various, dem Connection establishment and termination serving special characters) between · two exchanges. There will be two frequency groups formed with the following frequencies, for example:

BATH ORIGINAL

909808/0650

SEL / Reg. 11 294

Group 1 "660 Hz «780 Hz ^f 2 - 900 Hz ^f 3 = 1020 Hz ^f 4 -1140 Hz ^f 5

1380 H87986 Hz 1500 Hz Group 2 1620 Hz ^f 1 - 1740 Hz ^f 2 - 1860 Hz 1980 Hz ^f 4 " ^f 5 *

The first group is used to form characters in the (2 ans5) code, the second group for the formation of characters in the (2 from 6) code · In the (2 from 5) code 10, in the (2 from 6) code 15 different Code combinations are formed.

The 10 possible combinations of the (2 out of 5) code are used for Representation of the ten digits 0 to 9. The first 10 of the total of 15 possible combinations of the (2 of 6) code are also displayed. Due to the simultaneous transmission of a combination of each of the two codes, two Digits, e.g. digits of a subscriber number, can be sent. A code check can be made by always four signal frequencies must be present at the same time.

The remaining 5 combinations of the code (2 out of 6), each of which always coincides with one of the 10 combinations of the (2 from 5) codes can be transmitted, result if such signals also consist of four frequencies as a common one Information can be understood, further 50 representable signals

The parallel transmission of two digits each requires that the numbers to be transmitted, e.g. subscriber numbers, can be divided into groups of two. This is not possible for numbers with an odd number of digits. In these cases the last digit is transmitted in parallel with one of the code combinations 11 to 15 of group 2. That means, for example, the code combination 2 of the first group, ■ together with the code combination 12 of the second group means: 2 as the last digit of a number ·

909808/0650 - 5 -

There are still 40 of the 50 code combinations mentioned in this pall available. That means: in addition to the numbers that can be transferred in pairs, 40 different special characters can be used.

If one uses another code combination of the code combinations second group, e.g. 11, with a certain code combination, e.g. 1, the first group together the meaning of the already mentioned Repetition character (with signal transmission without pauses according to DAS 1 211 286), 39 code combinations remain free. This also meets the highest requirements in this regard.

To clarify the method according to the invention, the transmission of a subscriber number, for example 43 26 26 H 44 3, is explained in more detail. The transmission should take place without pauses, the repetition character is shown as described above (combination 1 plus combination 11), the combination 12 serves as a supplement character for the last digit of a number with an odd number of digits. Country code), 2626 the "Ürtskennzäi in the relevant country and 44 44 3 the subscriber number in the relevant local network. The transmission sequence is shown in the drawing in lines a) to f). The χ in line f) indicates the supplementary character (code combination 12 im (2 of 6) code) for the last digit, the 3 *. The digits between brackets under the frequency designations f ^. - f .. indicate a digit value of the respective signal frequency above in your code two frequencies contained in a code character each indicate the value of the transmitted digit, although the assumption applies: 4 + 7 = 10 (frequency combination f ^ + f, - or f ^ + f. _Q means number 10). In lines c) and e), the <ϊrepeat sign (f ,, + f ^) + (% ^{+ f} T |) », ^ie sign 1 + sign 11, is shown, since it is a repetition of the previous one (line b) or line d)) is a pair of digits.

- 6 - BAD ORIGINAL

909808/0650

" ⁶ " U87986 ·

SEL / Reg. 11 294

The method according to the invention has the advantage that precisely in the signaling phase in which a high speed is particularly desirable, that is to say during the establishment of the connection, by transmitting the call numbers in pairs
great time saving occurs. Further signals, such as trigger signals, monitoring symbols, etc. are only transmitted at a single speed, but these symbols generally only occur individually. Instead, a lot more different characters can be displayed.

3 claims

1 sheet of drawing, 1 fig.

90980 8/06 5 0

Claims (1)

- 7 SEL / Reg. 11 294 Patent claims Multi-frequency code signaling method for telecommunications, in particular Telephone systems in which every piece of information in a testable Code is transmitted, characterized in that two code combinations are transmitted at the same time, of which one in an (m out of n) code (e.g. 2 out of 5 - Code.}, with χ (e.g. χ = 10) possible code combinations and the other in an (m from p) code (e.g. 2 from 6 code) with χ + y (e.g. χ β 10, y »5) possible code combinations are shown, that different frequencies (f. - fc or fg - ^ m) are used for the two codes Transmission of a code combination of the first mentioned code (m from η code) with one of the χ code combinations of the second mentioned Codes have a separate meaning for the two pieces of information (e.g. ones and tens of a number) and that the simultaneous Transmission of a code combination of the first-mentioned code (m from η code) with one of the y code combinations of the second code (m from p-code) common information (e.g. end of dialing character) represents. Method according to Claim 1 for the transmission of subscriber call numbers and special codes, characterized in that the digits of a subscriber number are paired by a code combination of the first mentioned code (m from η code) and one of the χ code combinations of the second-mentioned code (m from p-code) are transmitted, and that in the case of an odd-numbered subscriber number, the last Digit by the corresponding code combination of the first mentioned code (m from η code) and a certain of the y code combinations (e.g. code combination 12) of the second mentioned code (m from p code) is transmitted. July 15, 1966 Gf / mg - 8 - 909808/0650 11 29, ' ^Ö ' ^U87986 Method according to Claim 1 or 2, in which the individual code combinations be transmitted without a pause and at the consecutive Code characters with the same meaning alternately with the code character itself and with a repetition code character are shown, characterized in that the repetition character consists of a certain code combination of the first * mentioned (e.g. code combination 1) and a certain one of the y code combinations of the second mentioned code (e.g. code combination 11) to be transferred 909808/0650