DE1035213B - Remote feed system - Google Patents

Description

GERMAN

The invention relates to a remote feed system for the power supply of along a communication link, between main offices, in particular unmanned intermediate and sub-offices, via one or more cables containing several coaxial lines.

In the case of newer coaxial cables with several thin coaxial lines or in the case of coaxial cables, the above about 6 Mhz are to be used, the amplifier spacing will have to be smaller than usual. There are then numerous intermediate offices required, so that the cost of a remote feed system over the named cables, in particular the cost of power supply switches, increases significantly.

This disadvantage is avoided in the remote feed system according to the invention in that the feed of the intermediate offices over several cable sections over part of the coaxial lines and the Supply between the main office and the neighboring intermediate office or between two neighboring ones Sub-offices from the intermediate offices or from the main office via another part of the coaxial lines takes place, with the secondary winding of an intermediate transformer as well as the intermediate amplifier in the intermediate office as well as the intermediate amplifiers in the preceding and the following Unteramt supplied. This type of construction of the remote feed system means that intermediate transformers are used in saved the sub-offices and part of the power supply switches. Intermediate and sub-offices usually have the same carrier frequency facilities; they only differ in terms of remote feed.

In a further embodiment of the invention, the number of for the interoffice supply and for the Sub-exchange supply used coaxial lines according to the power to be transmitted and the Operating voltage selected differently for the individual cable sections of the communication link. In particular, only a part of the coaxial lines present in the cable for the Remote feed used. In the middle, between main and intermediate office or between two intermediate offices lying cable sections only need the coaxial lines used for the inter-exchange supply to be provided with dining facilities. The remote feed system is also on cables with symmetrical Lines can be used in which, in a manner known per se, line transformers with center tap are used instead of the power supply switches. The achievable In this case, savings relate to the intermediate transformers.

The invention is explained in more detail with reference to the drawings. In

Remote feed system

Applicant:

Siemens & Halske Aktiengesellschaft,

Berlin and Munich,
Munich 2, Wittelsbacherplatz 2

Dipl.-Ing. Francesco Volpich, Milan (Italy),

and Karl Saubert, Munich,
have been named as inventors

Fig. 1 is a power supply system in the hitherto common design and in
Fig. 2 shows the associated route scheme;

Fig. 3 shows a power supply system according to the invention and

4 shows the associated route scheme;

Fig. 5 shows a benefit plan for the intermediate and sub-office supply.

In the example shown in FIG. 1, power supply system of the previously common embodiment, the power source 1 via the transformer 2 and the low-pass filters 3a provides ... 3n of power supply switches the supply currents to the inner conductor of coaxial lines 4a ... 4 "of a cable 5 having a plurality of ( n) coaxial lines. The coaxial line (s) can, as shown in FIG. 1, be accommodated in a single cable or else be distributed over two or more cables. The high passes of the power supply switches that transmit the message streams to the inner conductors are not shown. At the end of the cable section, the feed currents are fed via low-pass filters 6a ... 6 »to the intermediate transformer 7, one winding 8 of which in an economy circuit increases the incoming voltage to the input value from the beginning of the cable and thus compensates for the voltage loss along the cable section and the other winding 9 of which the intermediate amplifier in the first intermediate office, represented by the equivalent resistor 10, feeds. This arrangement is now repeated accordingly for the second and the following sections with the only difference that, instead of the transformer 2, the intermediate transformer 7 takes over the supply of the next section. The at

809 579/345

Claims (1)

3 4 this supply system necessary effort for each voltage, namely at taps of the secondary windings 9, unmanned intermediate office consists of an intermediate connected. transformer and a power supply switch (low-analog, the sub-office t / l is fed from the pass and high-pass) for each incoming and outgoing main office H from. The main transformer 2 has a coaxial line. Only at the end of a supply 5 tertiary winding 20, which has a section via the low-pass filters Za ₂ ... Zn _2, part «2 of the coaxial lines, namely 4« ₂ ... 4m ₂ , can be used as the power supply switch in the outgoing coaxial lines omitted, since it is connected between the coaxial cable 5 and via the two supply sections, as a rule, a cable section through which the amplifier 21 does not pass 6 a ₂ ... 6n _{2 is located} in the sub-office t / l feed current. Supplied by. As Fig. 3 clearly shows, in the sub-manned main office are sequentially, as in io am tern (71 ... no intermediate transformers are required Lines at Zl, Z2, ... fed, with half the number of the middle cable section, which is not traversed by the feed current of the coaxial lines for the back and forth direction, the power supply switches are connected in parallel. The arrows indicate the energy and to be sure, the low-pass filters for the feed stream and the upstream direction, 15 adjust for the news streams. In the power supply shown in FIG. 4, FIG. 4 shows the associated route diagram. From besystem according to the invention will be the intermediate positions Z 3, over a part of "1 mannten the Main Office H of available coaxial cables in the Z 6, etc. on the part of the coaxial lines and greater, z. B. located at three times the distance, the first sub-office Ul is fed via the other part of the co-intermediate offices ZZ, Z6, ... and fed via another ²⁰ axial lines. The sub-offices E / 2 and t / 4 are assigned to the sub-offices E / 2 and t / 4 from the intermediate office ZZ ren part «2 of the available coaxial office, and the sub-offices T / 5 and Ul etc. underlying sub-offices (72 and t / 4 or t / 5 and fed. The arrows indicate the direction of energy.
t / 7 etc supplied. Supplies "2 of coaxial cables, the nächst- 25 Office supplies and m2 located for Unteramt utilities Office Ul also from manned Main Office of the number resist coaxial cables for the interim is over the part. The current source 1 supplies one is suitably along the supply section via the transformer 2 with its winding 11 and change, since, as Figure 5 shows. The powers P to about Tiefpässe3 U ₁ ... Zn ₁ of power supply Unteramt portions (Kurveμ ) constant equal to 1, on which the feed currents 1 1 on part of the inner and intermediate office sections (curve z) but at the beginning conductor 4 « _x ... 4m _{2 of} a coaxial cable 5 with several 30 very large, z. B. equal to 16, with four inter-office section coaxial lines. At the end of the first cable section and also small at the end, usually equal to 3, the feed currents _{via the low-pass filters Oa 1 ... Ow 1} are. At the same supply voltage for the Zwischenamts- and 12 _ax ... 12 M ₁ on the Teilwl the coaxial Leitun- supply and Unteramt supply the gen 13% must ... 13M _one of the following cable section exceeded shares nl and «2 of the coaxial Lines, presented in. At the end of the second cable section, 35 examples are presented roughly like 16: 1 in the first section, the feed currents via further low-pass filters 14 a _t ... 14% and 11: 1 in the second, 7: 1 in the third and 3: 1 in the fourth, 15α _α ... 15M ₁ on the part μ 1 of the coaxial line behavior. The greater power loss at the beginning of the 16 "! ... 10m _{1 of} the third cable section. Cable is taken into account. In fact, at the end of this cable section, the feed voltage for the intermediate exchange supply will be selected to be much higher than the intermediate transformer 7 _{via the low-pass filters 17 «x} ... 17M _{1 than for the sub-exchange supply.} Meanwhile Primärwick- so that the proportion nl is smaller and the proportion "2 entlung 8 sets in saving circuit can be selected speaking greater the incoming voltage. In the case of a large up to the input value at the beginning of the cable and the number of coaxial lines in the cable, however, it is not necessary to compensate for the voltage loss along the three cables, especially in the last cable section 4 U ₁ ..., ISa ₁ UHd 10a ₁ . The increased 45 section of all coaxial lines for the remote power voltage is now used in the same way for feeding via supply, whereby further savings are achieved on the next three cable sections, etc.
winding 9 of the intermediate transformer 7 has two tasks. Once she has to use the repeater in the intermediate office 3, represented by the substitute contradicting 50 patent claims:
stood 10, eat, and on the other hand she must also eat Repeater in the previous sub-office t / 2 1. Remote feed system for the power supply and the subsequent sub-office t / 4, represented by along a communication link between the equivalent resistors 18 and 19, supply. Main offices arranged for this, in particular unrelated The purpose is the secondary winding 9 via the low-pass filters 55 manned intermediate and sub-offices, via an or 17 « ₂ ... 17M ₂ with the other part m2 of the coaxial line containing several several coaxial lines Lines, namely with 16 <z ₂ 16 n ₂ , connected. Via cable, characterized in that the supply of the the low-pass filters 15a ... 15n _t% Zwischenver- the intermediate positions are supplied via a plurality of cable sections 18 across more in Unteramt. 2 At the same time, the secondary winding 9 via the low-pass filters 22 a ₂ ... 22m ₂ 60 solution between the main and adjacent intermediate with the part µ 2 of the coaxial lines 23 a _t ... 23 M ₂ amt or between two adjacent intermediate connections. Via the low-pass passes 24a ₂ 24m ₂ , the subordinate offices located by the interim Repeater 19 fed in sub-office 4. The size of office or from the main office over another the voltage of the secondary winding 9 is done in this way- part of the coaxial lines, the se- tet that taking into account the voltage drops 65 both secondary winding of an intermediate transformer on the coaxial lines in the sub-offices t / 2 the repeater in the intermediate office as well as the and Z74 the repeater required for the repeater in the preceding and the Operating voltage arrives. Since in the intermediate office ZZ the following sub-office is provided, no voltage drops are to be taken into account, 2. remote feed system according to claim 1, thereby the intermediate amplifiers 10 at a slightly lower span 70 characterized in that the number of and sub-office supply used coaxial lines according to the power to be transmitted and the operating voltage for the individual cable sections of the communication link are different is. 3. remote feed system according to claim 1 or 2, characterized in that in particular in the last Cable section only part of the coaxial lines in the cable are used for the remote feed is. 1 sheet of drawings © 809 579/345 7.58