CS242402B1 - Connection of transmission fields on the switching stage of the telephone exchange - Google Patents

Abstract

The solution concerns the connection of transmission lines at the connection stage of a telephone exchange, consisting of stands with selectors, the rotary steps of which are connected to the outputs from the stand so that the stand has twenty outputs. The basic connection of transmission fields is the connection of the transmission field to the outgoing bundle with the number of lines equal to the number of stands in the transmission field. In the basic connection, the lines of the outgoing bundle are connected to the first exit of all stands and the other exits are connected to these lines in cyclic tandems with twenty exits and nineteen jumpers. The connections of transmission fields with the same number of stands, but > a greater number of lines in the outgoing bundle are derived from the basic connection. With an increasing number of lines connected to the transmission field, jumpers in tandems are gradually omitted from the basic connection and the outgoing bundle line is connected to the exit, which is the beginning of the separate part of the tandem.

Description

Author of the invention

Connection of transmission fields at the switching stage of the telephone exchange

The invention relates to the connection of geared conductors at the switching stage of a telephone exchange, consisting of a rack with selectors whose rotational steps are connected to the exits of the rack so that the rack has twenty exits. The basic connection of the transmission fields is the connection of the transmission field to the outgoing bundle with a number of lines equal to the number of racks in the transmission field.

In the basic connection, the outgoing beam lines are connected to the first exit of all the rack and the other exits are connected to these lines in eyklichy tandems with twenty exits and nineteen jumpers. From the basic connection, the connection of transmission fields with the same number of racks but> more lines in the outgoing bundle is derived.

As the number of wires connected to the transmission field increases, tandem jumpers are gradually omitted from the basic wiring, and the outgoing wiring line is connected to the east, which is the beginning of a separate part of the tandem.

242 402

242 402

BACKGROUND OF THE INVENTION The present invention relates to the connection of transmission fields at a connection stage of a telephone switchboard comprising a group of at least eleven selector stands in which a free exit from the stand is sought from a rest position in a natural order of ten rotations. "That the voters in the rack are divided into three mutually exclusive groups and the first rotating step through the fifth rotating step of the first group of voters are associated with the first exit to the fifth exit of the stand; up to the fifteenth exit of the stand, the first pivot step to the fifth pivot step of the third group of selectors are associated with; the sixteenth to twentieth exit of the stand and the sixth to tenth rotational step of all selectors in the rack are associated with the sixth to tenth exit of SEtojan.

The telephone connection between the two subscribers of the telephone network is established from the calling subscriber to the called subscriber, as a rule, via the connection stages located in the telephone exchanges. The connecting stage is formed, for example, by a group of racks with selectors. The coupling stage has inputs and exits. The incoming lines are permanently connected to the inputs of the connection stage, after which the telephone connection is extended to the connection stage. Outgoing lines are permanently connected to the exits of the connection stage, after which the telephone connection continues to the other connection stages of the telephone network. The connection stage connects the incoming line with a suitable outgoing line, thus connecting / input with a suitable exit.

The outgoing links of the coupling stage are grouped into outgoing bundles, each outgoing bundle extending from the coupling stage to the inputs of the next coupling stage. The number of exits of the coupling stage connected to the uplink bundle is generally greater than the number of lines of the uplink bundle. Therefore, an average of several exits of the connection stage is permanently connected to one outgoing beam line. This connection takes place in the transmission field.

The transmission field to the outgoing bundle comprises the outlets of the coupling stage, the number of which is, for example, twenty times the number of racks in the transmission field, and the jumpers between these outlets. The jumper is the wire connection of the two exits of the transmission field. If more than two exits of the transmission field are connected by jumpers in series, a tandem is created. The tandem has a start in the east to which the outgoing bundle line is connected. The gearbox is mounted on the side of the intermediate distributor fitted with vertical strips

242,402 pe peaks. Exits of the connecting stage are connected to the tips. Gearbox jumpers are mounted between the tips. The outgoing beam line is permanently connected to some of these peaks.

The following requirements are placed on a good transmission field:

- good throughput for telephone calls,

- easy design in projection,

- regular involvement,

- economy in material consumption,

- the possibility of relatively simple changes to the gearbox without impairing its good throughput,

- great crosstalk attenuation. and

Good operating throughput is the most important feature of the transmission field. In the gearbox with the selector racks, the individual exits are not equally operationally loaded. Exits which are associated with rotating steps with a smaller sequence number in the constituents are preferably occupied over exits that are associated with rotating steps with a larger sequence number in the constituents. In such transmission fields, the appropriate escalation is a decisive factor in their good throughput, in that multiple traffic exits are connected to the outgoing wiring either individually or fewer per wiring than less exits. The operational permeability of the transmission field also improves the uniformity in the interconnection of the individual racks in the transmission field. The transmission field is easier to design if a simple design methodology is developed and various graphic aids are available. Regular wiring of the transmission field is beneficial for installation and maintenance work, as it facilitates schematic orientation and realization of the transmission field. The gearbox is economical in material consumption when the sum of the lengths of all jumpers in the gearbox is as small as possible. Easily making changes in the transmission field is a very important requirement for the transmission field, since these changes are made quite often due to changes in the telephone network. It is desirable to keep as many jumpers as possible when changing 1 in the transmission field.

However, its operating throughput must not be reduced. These requirements for the transmission field contradict each other, so the design of the transmission field is always a compromise.

The main disadvantages of the existing transmission fields are that they have been designed individually according to their parameters3

242,402 roses - depending on the number of racks and the number of outgoing bundle lines. The transmission fields of similar or even identical parameters often had significantly different connections. In order to ensure good operational throughput of the transmission field, the design should respect the principles of gradation and uniformity in the interconnection of the individual racks with each other. However, the design was not examined by computer modeling, so the actual throughput of the proposed transmission field was only hypothetical. Gearbox design was laborious. Although designers were careful about the wiring of the gearbox, the design was relatively easy to make in the future, as the design field was not up to date. It was difficult to control the economy in material consumption. The mounting of the gearbox on the intermediate distributor was complicated by the fact that each gearbox had a different connection. Similar difficulties were encountered in the maintenance of operated transmission fields in the control panel. Repeated changes in the operated transmission field usually led to a gradual deterioration in its throughput, as it was not viable to remodel the entire transmission field due to a small change in the telephone network.

The above-mentioned disadvantages are eliminated by the connection of the transmission fields according to the invention, which consists in the fact that in the transmission field to the outgoing bundle with a number of lines equal to the number of racks in the transmission field in the transmission field and the other exits of the transmission field are connected to these lines in a number of racks of identical tandems starting at the first exit of all racks and repeating cyclically on individual racks, the last rack in the transmission field being considered adjacent to the first rack.

The connection of the transmission field with the number of lines in the outgoing bundle equal to the number of stands in the transmission field is according to the invention the basic connection from which the connection of the transmission fields is derived. with the same number of racks, but with more lines in the outgoing bundle than the number of racks in the transmission field. This derivation consists in the fact that with increasing number of lines connected to the transmission field, the first jumper of all tandems in the transmission-field is gradually omitted from the basic circuit, then the second adapter of all tandems etc., etc. Jumpers with the same serial number

242 402 υ different tandems are omitted evenly across the transmission field.

To the east, which is the beginning of a separate part of the tandem, one outgoing bundle line is always connected.

The main advantages of the invention are that the connection of the transmission fields according to the invention comprises most of the transmission fields at the coupling stage of the type mentioned above, which may occur in practice. Each transmission field is well operationally permeable, which is achieved by suitable gradation and relatively uniform interconnection of the individual racks with each other. The good operational throughput of the transmission fields of the invention has been verified by computer modeling. The gearboxes have a regular and well-arranged wiring that facilitates assembly work and maintenance.

They are economical in material consumption. The high crosstalk attenuation is achieved by minimal concurrency of the jumpers on the intermediate switchboard, which is prescribed for assembly.

The even greater effect of engaging the transmission fields according to the invention is achieved by the fact that all transmission fields form a uniform wiring system. They are similar to each other, so that the change of one transmission field to the other is carried out with a minimum of changes in the wiring of the existing transmission field and without a noticeable change in good operational throughput. the order of assembly of the individual jumpers is prescribed, which is the opposite order of their possible omission if the number of lines in the outgoing bundle increases. Cyclicity in the connection of transmission fields according to the invention facilitates the change in the number of racks in the transmission field - the jumpers are removed only between the first and last racks in the transmission field and the added racks are connected to the cyclical connection of the other jumpers.

All transmission fields can be pre-processed into a catalog from which the designer traces his particular transmission field into the project. The catalog simplifies the transmission field documentation. The catalog will facilitate the mechanical processing of the gearbox design as well as the elaboration of its laborious documentation on a computer, flawlessly and in the final graphic design of the project. When you develop your gearbox documentation, your computer will make it easier to expand this documentation with additional information that speeds up assembly and maintenance. Administrative and researchers will find in the catalog for study purposes the involvement of gearboxes, which so far! was not designed.

242 402

In the following, the invention is explained in detail by way of example embodiments in conjunction with the drawing. In Fig. 1, the connection stage is shown, where there are inputs, there are racks with selectors, eg, twenty exits from the rack, there are transmission fields, there are outgoing wiring harnesses.

FIG. 2 schematically shows a ten-step selector. Figure 3 schematically illustrates three selector groups in a rack and the connection of the rotational steps of these selector groups to the twenty exits of the rack, indicated by the reference numerals in Fig. 3 on the right. 4, the column of reference numerals in FIG. 4 to the left indicates the rotational steps of the selectors of all three groups shown in FIG. 3. FIG. with the eleven stands as shown in Fig. 4. The individual stands are indicated by the reference numerals in the row above the transmission field image; the vertical bar of the reference numerals to the left indicates the rotational steps of the selectors of all three groups in the racks. 5 also shows a first tandem starting at the first exit of the first one hundred January in a transmission field where an outgoing line is connected thereto. This exit is indicated by an arrow. FIG. 6 schematically shows a transmission field with eleven racks into an outgoing bundle of 14 lines. The transmission field comprises eleven tandems as shown in FIG. 5. The designations of the racks and the pivot steps are the same as in FIG. 5. The exits to which the outgoing bundle line is connected are indicated by an arrow. Fig. 7 schematically shows a transmission field with eleven stands into an outgoing bundle of seventy-four lines. The designations of the stands and the rotating steps are the same as those in Fig. 5 and Fig. 6. The exits to which the outgoing bundle cable is connected are indicated by an arrow.

Transmission field with eleven stands into an outgoing bundle of eleven lines / fig. 6 / is connected by means of eleven identical tandems, which are repeated cyclically on the gearbox stands. Each tandem connects twenty exits of the transmission field with nineteen jumpers. It starts at the first exit 16 of the respective rack where the outgoing bundle line is connected to it. In the diagram of FIG. 6, these exits are indicated by an arrow. In the cycle of recurring tandems on the racks, the last one goes

242 402 considers the rack 71 in the transmission field adjacent to the first rack 60 as if the transmission field were drawn on a cylindrical surface. By describing the engagement of the first tandem in the transmission field that begins at the first exit 16 of the first rack 61, the engagement of the entire transmission field will be described / FIG. 6 /.

First tandem transmission field / fig. 6 / is shown in FIG. 5 Has the first exit 16 of the first stand 61 connected via the ninth jumper 49 to the second exit 17 of the fourth stand 64 by three stands to the right, the second exit 17 being connected via the fifth jumper 45 to the third exit 18 of the second stand 62 o two racks to the left whose third exit 18 is connected via thirteenth jumper 53 to the fourth exit 19 of third rack 6J by one rack to the right, whose fourth exit 19 is connected via seventeenth jumper 57 to fifth exit 20 of seventh rack 67 to four racks to the right, the exit 20 is connected via the third jumper 43 to the fifteenth exit 30 of the same seventh rack 67, whose fifteenth exit 30 is connected via the eighteenth jumper 58 to the fourteenth exit 29 of the third rack 63 by four racks to the left. thirteenth exit 28 of the second rack 62 by one rack to the left, whose thirteenth exit 28 is connected via the sixth jumper 46 to the twelfth exit 27 of the fourth rack 64 by two racks on the right, whose twelfth exit 27 is connected via the tenth jumper 50 to the eleventh exit 26 of the first) rack 61 by three racks to the left. 42 with the sixteenth exit 31 of the same first stand 61, whose sixteenth exit 31 is connected via the eleventh jumper 51 to the seventeenth exit 32 of the fourth rack 64 by three racks to the right, whose seventeenth exit 32 is connected via the seventh jumper 47 to the eighteenth exit 33 two racks on the left, whose eighteenth exit 33 is connected via the fifth jumper 55 to the nineteenth exit 34 of the third rack 63 by one rack on the right, whose nineteenth exit 34 is connected via the nineteenth jumper 59 with the twenty exit 35 of the seventh rack 67 the outlet 35 is connected via a first jumper 41 s e sixth exit 2Ί of fifth rack 65 two racks to the left whose sixth outlet 21 is connected via eighth jumper 48 to the seventh exit 22 of sixth rack 66 one rack to the right whose seventh outlet 22 is connected through fourth jumper 44 to eighth exit 23 of the eighth rack 68 by two racks to the right, whose eighth exit 23 is connected via twelfth jumper 52 to the ninth exit 24 of tenth rack 70 by two hundred7

242, 402, whose ninth exit 24 is connected via the sixteenth jumper 56 to the tenth exit 25 of the eleventh rack 71 by one rack to the right where the first tandem is terminated.

The second tandem in the transmission field / fig. 6 / starts at the first exit 60 of the second rack 62, where an outgoing bundle line is attached thereto. The second tandem wiring is analogous to the first tandem wiring described above, except that the sequence number of the tandem exits of the tandem exits is one more, except for the tenth exit 25 of the first tandem 61 because in cyclic connection the first tandem 61 is considered following the last, eleventh. 7J. Similarly, the wiring of all the remaining nine tandems in the transmission field shown in FIG. 6 can be described.

Since in the transmission field shown in FIG. 6 the number of lines is equal to the number of racks, its connection is at the same time the basic connection for all transmission fields with eleven racks but with more lines in the outgoing bundle than eleven lines. One of them is the transmission field with eleven stands and seventy-four lines in the outgoing beam shown in Fig. 7.

In the transmission field / fig. 7), eleven uplink bundle lines are connected to the first exit 16 of all racks, as in the basic wiring (FIG. 6 /. The twelve to twenty-second lines are connected to the sixth exit 21 of all racks in all eleven tandem basic wiring / FIG. 6), the first jumper 41 is omitted, so that the twentieth exit 35 and the sixth exit 21 of the respective racks are disconnected in all tandem vehicles. The twenty-third to thirty-third lines are connected to the sixteenth exit 31 of all racks in all of the tandem base wiring in FIG. 6) the second jumper 42 is omitted, thus the eleventh exit 26 and the sixteenth exit 31 of the same rack are still disconnected. The lines of the thirty-fourth to forty-fourth are connected to the eleventh exit 26 of all racks and in all tandem basic wiring in FIG. 6) the third jumper 43 is omitted, thus the fifth exit 20 and the fifteenth exit 30 of the same rack are still disconnected. The lines of the forty-fifth to the fifty-fifth are connected to the eighth exit 23 of all racks and in all tandem basic wiring / fig. 6), the fourth jumper 44 is omitted, so that the seventh exit 22 and the eighth exit 23 of the respective racks are still open. The lines 56-66 are connected to the third exit 18 of all stands and in all tandemeeh

242 402 basic connection / fig. 6), the fifth jumper 45 is omitted, so that the second exit 17 and the third exit 18 of the respective racks are still disconnected. The remaining lines 67-71 are connected to the thirteenth exit 28 of the first rack 61, the second rack 62, the fourth rack 64, the fifth rack 65, the seventh rack 67, the eighth rack 68, the tenth rack 70, and the eleventh rack 7J » / o) Or. 6 /, to whose east the last eight lines have been connected, the Sixth Jumper 46 is omitted. In the first tandem, the twelfth exit 27 of the fourth rack 64 and the thirteenth exit 28 of the second rack 62 are disconnected. 66 and the thirteenth exit 28 of the fourth stand 64. In the fourth tandem, the twelfth exit 27 of the seventh stand 67 and the thirteenth exit 28 of the fifth stand 65 are disconnected. In the sixth tandem the twelfth exit 27 of the ninth stand 69 and the thirteenth exit 28 are seventh.

In the seventh tandem, the twelfth exit 22 of the tenth rack 70 and the thirteenth exit 28 of the eighth rack 68 are disconnected. In the ninth tandem the twelfth exit 27 of the first rack 61 and the thirteenth exit 28 of the tenth rack 70 are disconnected. In the eleventh tandem, the twelfth exit 27 of the third rack 63 and the thirteenth exit 28 of the first rack 61 are disengaged.

Claims (3)

SUBJECT OF THE INVENTION 242 402 CLAIMS 1. Connection of transmission fields at the switching stage of a telephone switchboard, comprising a group of at least eleven selector stands in which a free exit from the stand is sought from a rest position v; the natural order of the ten rotating steps and whose rotating steps are associated with the twenty exits of the rack by dividing the selectors in the rack into three mutually exclusive groups and the first rotating step through the fifth rotating step of the first group of selectors are connected to the first exits , the first pivot step to the fifth pivot step of the second group of selectors are associated with the eleventh exit to the fifteenth exit of the rack, the first pivot step to the fifth pivot stage of the third group of selectors is associated with the sixteenth exit to the twentieth exit of the rack, in the rack are connected to the sixth exit to the tenth exit of the rack, characterized in that in the transmission field to the outgoing bundle with a number of lines equal to the number of racks in the transmission field, the outgoing bundles are connected one by one to the first outlet in gear box and the other exits the gear box on these lines are connected in a number of racks identical tandem starting with the first east / 16 / of racks and repeating cyclically for individual racks .při_čemž last stand in the _(gear box is considered as adjacent to the first stand. Wiring according to claim 1, characterized in that the first exit in the transmission field has a first exit (16) of the first stand (61) connected via a ninth jumper (49) to the second exit (17) of the fourth stand (64) by three stands to the right. whose second exit (17) is connected via the fifth jumper (45) to the third exit (18) of the second rack (62/6) with two racks to the left, whose third exit (18) is connected via the thirteenth jumper (53) to the fourth exit (19) third rack (63) o one rack to the right whose fourth exit (19) is connected via the seventeenth jumper (57) to the fifth exit (20) of the seventh rack (67) by four racks to the right whose fifth exit (20) is connected through the third a jumper (43) with the fifteenth exit (30) of the same seventh stand (67) whose fifteenth exit (30) is connected via the eighteenth jumper (58) to the fourteenth exit (29) of the third rack (63) / 29 / is connected via the fourteenth propo jku (54) with the thirteenth exit (28) of the second stand (62) one stand on the left, whose thirteenth exit ΙΌ 242 402 (28) is connected via the sixth jumper (46) to the twelfth exit (27) of the fourth rack (64) by two racks on the right, whose twelfth exit (27) is connected via the tenth jumper (50) to the eleventh exit (26) of the first three racks on the left, whose eleventh exit (26) is connected via a second jumper (42) to the sixteenth exit (31) of the same first rack (61), whose sixteenth exit (31) is connected via an eleventh jumper (51) with the seventeenth exit (32) of the fourth rack (64) three racks to the right, whose seventeenth exit (32) is connected via a seventh jumper (47) to the eighteenth exit (33) of the second rack (62), 33) is connected via the fifteenth jumper (55) to the nineteenth exit (34) of the third rack (63) by one rack to the right, whose nineteenth exit (34) is connected via the nineteenth jumper (59) to the twenty exit (35) of the seventh rack / o four stands on the right, whose twentieth exit (35) is connected via the first jumper (41) to the sixth exit (21) of the fifth rack (65) by two racks to the left, whose sixth exit (21) is connected via the eighth jumper (48) to the seventh exit (22) a sixth stand (66) one stand to the right whose seventh exit (22) is connected via a fourth jumper (44) to the eighth exit (23) of the eighth stand (68) the two stands to the right whose eighth exit (23) is connected via the twelfth junction (52) with the ninth exit (24) of the tenth rack (70) two racks to the right, whose ninth exit (24) is connected via the sixteenth jumper (56) to the tenth exit (25) of the eleventh rack (71) by one rack to the right where the first tandem ends. Wiring according to items 1 and 2, characterized in that lines with a sequence number greater than the number of racks in the transmission field and not more than twice this number are connected one at a time to the sixth exit (21) of the individual racks uniformly along the transmission field. the tandem to which the line is connected are disconnected by the twentieth exit (35) and the sixth exit (21) of the respective racks by omitting the first jumper (41), the lines having a sequence number greater than twice the number of racks in the transmission field and not more than three times connected one by one to the sixteenth exit (31) of the individual racks evenly over the transmission field and in the tandem to which the line is connected, the eleventh exit (26) and the sixteenth exit (31) of the same respective rack are disconnected by omitting the second jumper (42) a serial number greater than three times the number of racks in the gear242 402 η in the field and not more than four times this number are connected one at a time to the eleventh exit (26) of the individual racks equally over the transmission field and the fifth exit (20) and the fifteenth exit (30) of the same racks by omitting the third jumper (43), lines with a sequence number greater than four times the number of racks in the transmission field and no more than five times that number are connected one by one to the eighth exit (23) of the racks uniformly along the transmission field and in tandem the lines are connected, the seventh exit (22) and the eighth exit (23) of the respective racks are disconnected by omitting the quarter jumper (44), lines with a sequence number greater than five times the number of racks in the transmission field the third exit (18) of the individual racks evenly after the disp the second exit (17) and the third exit (18) of the respective racks are disconnected by omitting the fifth jumper (45), a line with a sequence number greater than six times the number of racks in the transmission field and not more than seven times this number are connected one at a time to the thirteenth exit (28) of the individual racks uniformly across the transmission field and in the tandem connected to the line, the twelfth exit (27) and the thirteenth exit (28) of the respective racks are disconnected by omitting the sixth jumper. /, lines with a sequence number greater than seven times the number of racks in the transmission field and no more than eight times that number are connected one at a time to the eighteenth exit (33) of the individual racks evenly along the transmission field and in the tandem to which the line is connected exit (32) and eighteenth exit (33) of the respective racks by omitting the seventh jumper (47), lines with a sequence number greater than eight times the number of racks in the transmission field and no more than nine times that number are connected one at a time to the seventh exit (22) of each rack equally over the transmission field and in tandem connected, the sixth exit (21) and the seventh exit (22) of the respective racks are disconnected by omitting the eighth jumper (48), lines with a sequence number greater than nine times the number of racks in the transmission field and not more than ten times this number are connected one to the other (17) of the individual racks evenly over the transmission field and in the tandem to which the line is connected, the first exit (16) and the second 242 402 of the respective racks by omitting the ninth jumper (49), lines with a sequence number greater than ten times the number of racks in the transmission field and no more than eleven times that number are connected one at a time to the twelfth exit (27) of each rack equally The eleventh exit (26) and the twelfth exit (27) of the respective racks are disconnected by omitting the tenth jumper (50), a line with a sequence number greater than eleven times the number of racks in the transmission field, and not more than twelve times this number are connected one at a time to the seventeenth exit (32) of the individual racks uniformly across the transmission field and in the tandem to which the line is connected the 16th exit (31) and the seventeenth exit (32) of the respective racks are disconnected by omitting the eleventh jumper; / 51 /, line with serial no a rim of more than twelve times the number of racks in the transmission field and no more than thirteen times that number are connected one at a time to the ninth exit (24) of the individual racks evenly after the transmission field and the tandem to which the line is connected. the ninth exit (24) of the respective racks by omitting the twelfth jumper (52), lines with a sequence number greater than 13 times the number of racks in the transmission field and no more than 14 times that number are connected one at a time to the fourth exit (19) and in the tandem to which the line is connected, the third exit (18) and the fourth exit (19) of the respective racks are disconnected by omitting the thirteenth jumper (53), a line having a sequence number greater than fourteen times the number of racks in the transmission field and no more than fifteen times of this number are taken connected one by one to the fourteenth exit (29) of the individual racks evenly across the transmission field and in the tandem to which the line is connected, the thirteenth exit (28) and the fourteenth exit (29) of the respective racks are disconnected by omitting the fourteenth jumper (54). with a number greater than fifteen times the number of racks in the transmission field and no more than sixteen times that number are connected one at a time to the nineteenth exit (34) of the individual racks equally over the transfer field and eighteenth exit (33) disconnected in the tandem to which the line is connected and the nineteenth exit (34) of the respective racks by omitting the fifteenth jumper (55), a line having a sequence number greater than 16 times the number of racks in the transmission field and not 242 402 greater than seventeen times of this number are connected one at a time to the tenth exit (25) of the individual racks uniformly over the transmission field and the tenth exit to the line is disconnected from the ninth exit (24) and tenth exit (25) of the respective racks by omitting the sixteenth jumper (56), lines with a sequence number greater than 17 times the number of racks in the transmission field and not more than 18 times that number are connected one at a time to the fifth exit (20) of each rack equally over the transmission field and in tandem connected, the fourth exit (19) and the fifth exit (20) of the respective racks are disconnected by omitting the seventeenth jumper (57), lines with a sequence number greater than eighteen times the number of racks in the gearbox and not more than nineteen times that number exit (30) of individual stands the fourteenth exit (29) and the fifteenth exit (30) of the respective racks are disconnected evenly over the transmission field and in the tandem to which the line is connected by omitting the 18th jumper (58), a line with a sequence number greater than 19 times the number of racks and not more than twenty times this number are connected one at a time to the twentieth exit (35) of the individual racks uniformly across the transmission field and the nineteenth exit (34) and the twentieth exit) of the respective racks are disconnected in the tandem to which the line is connected. nineteenth jumpers / 59 /.