RU2479124C2 - Trunk line - Google Patents

Abstract

FIELD: radio engineering, communications.

SUBSTANCE: in the available trunk N-channel line a pair of wires of an n channel, where n=1,2,…, N, is connected with crossing or without crossing depending on values of the set calculation function C_m(n,k), where m=0,1,2,…,M - number of a member of a selected M-member recurrent row F(m), M values of the calculation function C_m(n, k) is calculated according to the formula

where a_n(m) - a modified value of the number of the n channel of the trunk line, which is calculated according to the following formula:

The M-member recurrent row F(m) may be represented by different recurrent rows.

EFFECT: development of a trunk line requiring lower economic inputs for its installation, in which at the specified number of channels N increase of a process section is achieved with preservation of the required level of noise immunity of a group of mutually influencing circuits of communication lines.

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Description

The invention relates to communication technology, and in particular to a device for cable and overhead communication lines, in particular, can be used to improve the noise immunity of a group of mutually influencing circuits of communication lines, as well as for protection from external electromagnetic fields.

Known trunk lines of communication (MLS), which include a terminal transmission system, amplification points and blocks of crossing wires (BSP).

Known MLS according to the patent of the Russian Federation No. 2060590, according to the application No. 93033334/09 of 06.25.1993, the first independent claim.

Known MLS consists of two cables, each of which contains a core, a metal sheath, an internal insulating cover, an armor cover and an external insulating cover. To protect against external electromagnetic fields in a known trunk communication line, a two-wire channel circuit is crossed, consisting of an armored cover and a metal sheath of each cable between the first and second sections of the technological section. Additionally, the two-wire circuit of the channel is mutually crossed, consisting of an armored cover and a metal sheath of the first and second cable between the first and second, as well as the second and third sections of the technological section. In addition, perform the mutual crossing of the first and second cable between the third and fourth sections of the technological section.

A disadvantage of the known MLS is the relatively high level of uncompensated interference induced in the MLS. This is due to the fact that the crossing of the two-wire circuit of the MLS channel, consisting of armored cover and a metal sheath, between the first and second sections of the cable breaks the cable into two non-identical sections, as a result of which the interference currents from two adjacent sections of the crossing do not completely cancel each other and, therefore, interference from the last section remains partially uncompensated.

In addition, the mutual crossing of two-wire circuits made of different cables causes significant technological difficulties.

Known MLS patent of the Russian Federation No. 2266581, according to the application No. 2004107947/09 of 03/19/2004, the first independent claim.

The known MLS consists of one two-wire circuit of a communication channel channel and an additionally introduced two-wire circuit of a communication channel channel, the ends of which are combined, and the figure formed by the two-wire circuit of one channel is placed symmetrically in the space between the figure formed by the two-wire circuit of the other channel. Chains balance by their resistance.

The disadvantage of an analogue is the high level of economic costs for building a communication line. This is due to the introduction of additional two-wire circuits in the MLS.

The closest in technical essence (prototype) to the claimed one is the MLS described in the book: Evstigneev A.A., Kozyrev N.E., Khakimov N.Z., Yakovlev E.A. Linear communication facilities. - L .: YOU, 1968, p. 168, 169, Fig. 7.6.

In the well-known trunk N-channel communication line (prototype), each channel is made in the form of a pair of wires. MLS contains a set of series-connected through amplification points of technological sections of equal length L, connected to the end points of the transmission. Within each technological section, K≥1 wire crossing units are installed equidistantly at intervals of l, and in the k-th wire crossing unit, where k = 1, 2, ..., K is a pair of wires of the nth channel, where n = 1, 2, ..., N, is connected with or without crossing, depending on the values of the given calculation function C _m (n, k), where m = 0, 1, 2, ..., M is the member number of the selected M-term recurrence series F (m) type:

Reducing the systematic component of the effect between two-wire circuits of the channels of the MLS is carried out by crossing the wires of the circuit of the channel of the communication line at certain intervals l along the line length. MLS channels will be mutually protected only if they have different crossing patterns.

In addition, the crossing of chains gives a positive effect only if the interval l is selected from the condition λ≤λ / 8, where λ is the smallest wavelength in the signal spectrum of the equipment of the transmission terminal. In this case, the effect between the crossed chains decreases so many times as much as the value of the interval l is less than λ / 8. With increasing signal frequency, the wavelength decreases, which leads to a decrease in the effect of cross-linking. Therefore, to obtain a positive effect, chains sealed with the equipment of the transmission endpoint need to be crossed more often.

A disadvantage of the known MLS is the relatively high cost of its construction. This disadvantage is due to the fact that with the selected recurrence series of the form (1), it is impossible to increase the technological section without reducing the required noise immunity of a group of mutually affecting communication line circuits.

The aim of the claimed invention is the development of MLS, requiring lower economic costs for its installation, in which, for a given number of channels N, an increase in the technological section is achieved while maintaining the required level of noise immunity of a group of mutually affecting communication line circuits.

The claimed main communication line expands the arsenal of means for this purpose.

This goal is achieved by the fact that in the well-known main N-channel communication line, each channel of which is made in the form of a pair of wires containing a set of technological sections in series connected through amplification points of equal length L, connected to transmission end points, within which it is equidistant at intervals l installed K≥1 blocks of crossing wires, and in the k-th block of crossing wires, where k = 1, 2, ..., K, a pair of wires of the nth channel, where n = 1, 2, ..., N, is connected with crossing or without crossing depending on the values of the given calculation function C _m (n, k), where m = 0, 1, 2, ..., M is the member number of the selected M-term recurrence series F (m), M is the value of the calculation function C _m (n, k) calculated by the formula

where a _n (m) is the modified value of the number of the nth channel of the trunk line, and if from the total number M of calculated values of the function C _m (n, k) for the nth channel connected to the kth block of wire crossing, it is odd if the number of non-zero values of C _m (n, k) are integer, then the conductors of the nth channel in the k-th block of crossing wires are connected with a cross, otherwise - without crossing.

The modified value of the number of the n-th channel of the main communication line a _n (m) is calculated by the formula:

moreover, a _n (m) = 1, if 2 ^m is the summand of the sum making up the channel number of the trunk communication line n, otherwise a _n (m) = 0.

As the M-membered recurrence series F (m), various recurrence series can be used. For example, as the M-membered number series F (m), the M first non-repeating members of the nth recurrence series of the form can be selected:

where P is the total number of recurrence series of the selected type.

Also, as an M-membered number series F (m), a recurrence series of the form can be applied:

The value of the interval l is selected from the condition λ≤λ / 8, where λ is the shortest wavelength in the spectrum of the signal of the equipment of the transmission terminal.

Thanks to this new set of essential features, the claimed MLS makes it possible to exclude an increase in the level of mutual influence of channels by increasing the number of crossing options and, therefore, the possibility of increasing the length of the technological section for a given number N of communication channels.

The claimed main communication line is illustrated by drawings, which show:

figure 1 - the composition of the trunk communication line;

figure 2 is an option for connecting wires in the block crossing wires;

figure 3 is a technological section of the claimed main communication line, in which M the first non-repeating members of the nth recurrence series of the form (4) are selected as the M-membered number series F (m);

figure 4 is a technological section of the claimed main communication line, in which a recurrent series of the form (5) is used as the M-membered number series F (m);

figure 5 - calculated comparative graphs of the dependence of the length of the technological section L of the declared MLS on the number of elements M of a predefined number series F (m) in the claimed device and prototype.

figure 6 is a technological section of the main communication line of the prototype;

The claimed main communication line shown in figure 1, consists of a terminal transmission system 1, amplification points 2 and blocks crossing wires (BSP) 3.

Figure 1 marked: L is the length of the technological section, D is the total length of the trunk communication line, l is the interval between adjacent to each other BSP 3, K is the number of BSP 3 in the interval L.

The terminal transmission systems of MLS 1 are known and intended for the formation of typical channels and transmission paths provided to consumers for organizing various types of communication using secondary compression equipment. The terminal transmission system 1 is connected to the physical circuit of the MLS made of metal wires. The terminal transmission systems of 1 MLS are known and described, for example, in the book: Ananyev A.S., Isakson B.K., Koltsov V.V., Lavrish B.C., Lebedev A.T., Ovchinnikov A.A. Channel formation and management on primary communication networks. / Ed. A.T. Lebedev. - L .: YOU, 1986, p. 189-206.

Amplification points 2 of the MLS are known and are intended to compensate for the attenuation of the signal in the physical circuits of the MLS, as well as to correct distortion of the signal during the passage of the signal through the physical circuits. Amplification points 2 of the MLS are connected to the physical circuit of the MLS made of metal wires. Amplification points 2 MLS are connected between the terminal transmission systems of 1 MLS at a distance equal to the length of the technological section. Amplification points 2 of the MLS are known and described, for example, in the book: Ananyev A.S., Isakson B.K., Koltsov V.V., Lavrish B.C., Lebedev A.T., Ovchinnikov A.A. Channel formation and management on primary communication networks. / Ed. A.T. Lebedev. - L .: YOU, 1986, p. 159-188.

Blocks of crossing wires (BSP) 3 MLS known and designed to reduce the systematic component of the effect between the chains of the MLS by crossing the chains, that is, the mutual change of places of the wires of the circuit. An option to connect the wires of all the channels of the MLS in the BSP is shown in figure 2. BSP 3 MLS are connected at certain intervals l to the physical circuit of the MLS channel, made of metal wires, within the technological section. After each crossing, the direction of the interference currents changes, as a result of which the interference currents from two adjacent gaps l cancel each other out and the influence between the circuits decreases. Therefore, the number of gaps l in the technological section must be even. In addition, the channels of the MLS will be mutually protected only if they have different crossing patterns. BSP 3 MLS are known and described, for example, in the book: Evstigneev A.A., Kozyrev N.E., Khakimov N.Z., Yakovlev E.A. Linear communication facilities. - L .: YOU, 1968, p. 41-43, fig. 2.14-2.16

The metal wires of the physical circuit of the MLS are intended for signal transmission by the terminal transmission system 1. The metal wires of the physical circuit of the MLS are known and described, for example, in the book: Evstigneev A.A., Kozyrev N.E., Khakimov N.Z., Yakovlev E.A. . Linear communication facilities. - L .: YOU, 1968, p. 22-30, p. 46-49.

Declared MLS works as follows.

As an example, we consider an MLS in which, as an M-membered recurrence series F (m), a recurrence series of the form (5) is used. The technological section of the MLS, in which the recurrence series of the form (5) is selected as the M-membered recurrence row F (m), is shown in Fig. 4.

At the first stage, the number of members of the M-membered recurrence series F (m) is determined based on the given number of MLS channels n, where n = 1, 2, ..., N, with N <2 ^{M + 1} .

For a fifteen-channel MLS, the inequality N <2 ^{m + 1} is satisfied at M = 3. For M = 3, m = 0, 1, 2, 3, using the recurrence series (5), we obtain the number series 1, 2, 3, 4, since F (0) = 2, F (1) = 1, F (2) = 3, F (3) = 4.

Then, the modified value of the number of the n-th channel of the MLS a _n (m) is calculated by the formula (3), and a _n (m) = l, if 2 ^m is the summand of the sum of the channel number of the trunk line n, otherwise a _n (m) = 0.

For the 13th channel of the trunk line:

,

,

that is, the modified value of the 13th channel of the trunk line takes the value 1,0,1,1, where a ₁₃ (0) = 1, a ₁₃ (1) = 0, and ₁₃ (2) = 1, a ₁₃ (3 ) = 1. The modified number value for the remaining MLS channels is presented in Table 1.

Table 1 The modified value of the number of the n-th channel of the MLS MLS channel number, n The modified value of the number of the n-th channel of the MLS a _n (0) a _n (1) a _n (2) a _n (3) one. one 0 0 0 2. 0 one 0 0 3. one one 0 0 four. 0 0 one 0 5. one 0 one 0 6. 0 one one 0 7. one one one 0 8. 0 0 0 one 9. one 0 0 one 10. 0 one 0 one eleven. one one 0 one 12. 0 0 one one 13. one 0 one one fourteen. 0 one one one fifteen. one one one one

Next, M values of the function C _m (n, k) are calculated by the formula (2) for the 13th channel of the trunk communication line (n = 13) in the 9th BSK (k = 9):

, т.е. не равно целому числу;

, i.e. not equal to an integer;

;

;

, т.е. целочисленное;

, i.e. integer

, т.е. не равно целому числу.

, i.e. not equal to an integer.

Thus, at the 13th channel of the main communication line (n = 13) in the 9th BSK (k = 9) there is a crossing of wires, since from M calculated values of the function C _m (n, k) an odd number of non-zero the values of the function C _m (n, k) are integer.

The values of the function C _m (n, k) for the 13th channel of the MLS (n = 13) in the remaining BSK, as well as the need to cross its wires in the BSK are presented in Table 2.

table 2 The values of the function C _m (n, k) for the 13th channel of the MLS (n = 13) in the k-th BSK BSK number, k Values of the function C _m (n, k) for the 13th channel of the trunk line Crossbreeding: “+” - crossed “-” - not crossed C ₀ (13, k) C ₁ (13, k) C ₂ (13, k) C ₃ (13, k) one. 0.5 0 0.33 0.25 - 2. one 0 0.67 0.5 + 3. 1.5 0 one 0.75 + four. 2 0 1.33 one - 5. 2.5 0 1.67 1.25 - 6. 3 0 2 1.5 - 7. 3.5 0 2.33 1.75 - 8. four 0 2.67 2 - 9. 4.5 0 3 2.25 + 10. 5 0 3.33 2.5 + eleven. 5.5 0 3.67 2.75 - 12. 6 0 four 3 + 13. 6.5 0 4.33 3.25 - fourteen. 7 0 4.67 3.5 + fifteen. 7.5 0 5 3.75 + 16. 8 0 5.33 four - 17. 8.5 0 5.67 4.25 - eighteen. 9 0 6 4.5 - 19. 9.5 0 6.33 4.75 - twenty. 10 0 6.67 5 - 21. 10.5 0 7 5.25 + 22. eleven 0 7.33 5.5 + 23. 11.5 0 7.67 5.75 -

The technological section of the MLS, in which the recurrent series of the form (4) is selected as the M-membered recurrence row F (m), is shown in Fig. 3, and the technological section of the MLS - prototype is shown in Fig. 6.

The dependence of the length of the technological section of the MLS L on the number of elements of the M-membered number series F (m) calculated using the recurrence formula (4) is shown in Table 3.

Table 3 The dependence of the length of the technological section of the MLS L on the number of elements of the M-membered number series F (m) calculated using the recurrence formula (4) P value Values of the M-membered number series F (m) Technological section length Number of channels Note 0 1,2 four 3 As p grows, the lower terms of the number series become the same. 1,2,4 8 7 1,2,4,8 16 fifteen 1,2,4,8,16 32 31 1,2,4,8,16,32 64 63 one 1,2 four 3 1,2,3 12 7 1,2,3,5 60 fifteen 1,2,3,5,8 240 31 1,2,3,5,8,13 3120 63 2 1,2 four 3 1,2,3 12 7 1,2,3,4 24 fifteen 1,2,3,4,6 144 31 1,2,3,4,6,9 1296 63 3 1,2 four 3 1,2,3 12 7 1,2,3,4 24 fifteen 1,2,3,4,5 120 31 1,2,3,4,5,7 840 63 four 1,2 four 3 1,2,3 12 7 1,2,3,4 24 fifteen 1,2,3,4,5 120 31 1,2,3,4,5,6 720 63

The dependence of the length of the technological section of the MLS L on the number of elements of the M-membered number series F (m) calculated using the recurrence formula (5) is shown in Table 4.

Table 4 The dependence of the length of the technological section of the MLS L on the number of elements of the M-membered number series F (m) calculated using the recurrence formula (5) Values of the M-membered number series F (m) Technological section length Number of channels 2.1 four 3 2,1,3 12 7 2,1,3,4 24 fifteen 2,1,3,4,7 168 31 2,1,3,4,7,11 1848 63

The dependence of the length of the technological section L on the number of elements of the M-membered number series F (m) is shown in FIG. Figure 5 marked:

the solid line is the length of the technological section of the MLS, in which the M first non-repeating members of the nth recurrence series of the form (4) are selected as the M-membered number series F (m);

the dashed line is the length of the technological section of the MLS in which a series of the form (5) is used as the M-membered number series F (m).

The ratio of the length of the technological section of the MLS, in which the first non-repeating members of the nth recurrence series of the form (4) to the length of the technological section of the MLS prototype are selected as the M-membered number series F (m), is presented in Table 5.

Table 5 The ratio of the length of the technological section of the MLS, in which M the first non-repeating members of the rth recurrence series of the form (4) are selected as the M-membered number series F (m) to the length of the technological section of the MLS prototype P value Technological section length Number of channels Relation to the length of the technological section of the prototype 0 four 3 one 8 7 one 16 fifteen one 32 31 one 64 63 one one four 3 one 12 7 1.5 60 fifteen 3.75 240 31 7.5 3120 63 48.75 2 four 3 one 12 7 1.5 24 fifteen 1.5 144 31 4.5 1296 63 20.25 3 four 3 one 12 7 1.5 24 fifteen 1.5 120 31 3.75 840 63 13.125 four four 3 one 12 7 1.5 24 fifteen 1.5 120 31 3.75 720 63 11.25

The ratio of the length of the technological section of the MLS, in which the recurrence series of the form (5) is applied as the M-membered number series F (m) to the length of the technological section of the MLS prototype, is presented in Table 6.

Table 6 The ratio of the length of the technological section of the MLS, in which the recurrent series of the form (5) is used as the M-membered number series F (m) to the length of the technological section of the MLS prototype Technological section length Number of channels Relation to the length of the technological section of the prototype four 3 one 12 7 1.5 24 fifteen 1.5 168 31 5.25 1848 63 28.875

The results obtained provide the basis for the following conclusions:

in the claimed MLS, for a given number of channels N, an increase in the length of the technological section L is achieved while maintaining the required level of noise immunity of a group of mutually influencing chains of communication lines;

declared MLS extends the range of lengths of the technological section while maintaining the required level of noise immunity of a group of mutually affecting circuits of communication lines;

the declared MLS provides an increase in the number of crossings of the wires of the communication line at a fixed length of the technological section by several times (see Table 5, Table 6), which will allow to maintain the required noise immunity of a group of mutually affecting communication line circuits with increasing frequency of the signal spectrum of the terminal equipment transmission.

The data obtained confirm the possibility of achieving the stated goal - the development of a trunk communication line, which requires lower economic costs for its installation, in which, for a given number of channels N, an increase in the length of the technological section is achieved while maintaining the required level of noise immunity of a group of mutually influencing communication line circuits.

Claims (4)

1. An N-channel backbone communication line, each channel of which is made in the form of a pair of wires, containing a set of technological sections of equal length L connected in series through amplification points, connected to transmission end points, and within each technological section, K≥ are installed equidistant with an interval l 1 blocks of crossing wires, and in the k-th block of crossing wires, where k = 1, 2, ..., K, a pair of wires of the n-th channel, where n = 1, 2, ..., N, is connected with crossing or without crossing in depending on the values of This calculated function C _m (n, k), where m = 0, 1, 2, ..., M - the member number of the selected M-membered recurrent series F (m), characterized in that the M values C _m (n computational functions k) calculated by the formula

where a _n (m) is the modified value of the number of the n-th channel of the trunk line, and if from the total number M of calculated values of the function C _m (n, k) for the n-th channel connected to the k-th block of wire crossing, it is odd if the number of non-zero values of C _m (n, k) are integer, then the nth channel conductors in the k-th cross-section of the wires are connected with a cross, otherwise, without a cross, and the modified value of the number of the n-th channel of the trunk _n (m) is calculated by the formula:

moreover, a _n (m) = 1, if 2 ^m is the summand of the sum making up the channel number of the trunk communication line n, otherwise a _n (m) = 0. 2. The main communication line according to claim 1, characterized in that as the M-membered number series F (m), the M first non-repeating members of the nth recurrent series of the form are selected:
F (m) = F (m-1) + F (mp-1) | _{m≥p + 1} , m = 0, 1, 2, ..., M;
F (0) = F (1) = ... = F (p) = 1, p = 1, 2, ..., P,
where P is the total number of recurrence rows of the selected type. 3. The trunk communication line according to claim 1, characterized in that as a M-membered number series F (m), a recurrence series of the form:
F (m) = F (m-1) + F (m-2) | _m≥2 , m = 0, 1, 2, ..., M, F (0) = 2, F (1) = 1. 4. The trunk communication line according to claim 1, characterized in that the value of the interval 1 is selected from the condition λ≤λ / 8, where λ is the smallest wavelength in the signal spectrum of the equipment of the transmission terminal.

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