KR102292627B1 - Optical fiber and power line composite cable - Google Patents

Abstract

The present invention can improve the efficiency of the system by providing an optical fiber unit for transmitting and receiving optical signals and a power line unit for transmitting power at the same time, and furthermore, it is possible to save time and cost when installing a twisted merchant wire and an opto-electric composite cable. It is to provide a photoelectric composite cable.

Description

Optical fiber and power line composite cable}

An embodiment of the present invention relates to an opto-electric composite cable, and more particularly, to an opto-electric composite cable that transmits a control signal, a mobile communication signal, and power of a base station equipment in a mobile communication base station.

In the case of conventional mobile communication, a communication signal is transmitted to a base station from a communication company's backbone station, etc., and an RF signal transmitted from a BTS (Base Transceiver Station) of the base station is applied to the base station antenna and transmitted. In addition, the wireless signal transmitted from the user's mobile phone is applied to the base station antenna, and the applied signal passes through a Tower Mount Amplifier (TMA), and its signal strength is amplified and received by the BTS. At this time, the base station, the TMA, and the antenna are connected by a coaxial feed line.

However, the coaxial feeder has a problem in that signal loss increases as the length of the cable increases. Accordingly, when the antenna is installed in a tower with a height of several tens of meters, a loss occurs in the coaxial feed line connecting the base station on the ground and the antenna, and the signal applied from the base station by the loss of the coaxial feed line is transmitted from the antenna. It does not reach the required signal strength and is attenuated. Therefore, it is necessary to amplify the signal as much as the attenuation amount of the coaxial feeder, which causes additional power consumption. In addition, the signal transmitted from the mobile phone and received by the base station antenna has a relatively weak signal strength, so it is very difficult to transmit it to the BTS using a coaxial feeder with a large loss. Therefore, it is essential to install a Tower Mounted Amplifier (TMA) that amplifies the attenuated signal on the input side of the antenna. However, since the TMA consumes a relatively large amount of power to amplify the signal, in terms of the overall system, maintenance costs a lot and the efficiency thereof is reduced.

The RRH (Remote Radio Head) compensates for the inefficient disadvantages of power consumption and maintenance of the mobile communication base station using the TMA. The RRH separates the RRU (Remote RF Unit) from the conventional BTS and places it under the antenna of the base station tower and controls it remotely.

Here, the remaining parts of the existing BTS (that is, the baseband unit (BBU) and the power supply unit (PSU)) and the RRU in which the RRU is separated from the RRH are an opto-electric composite cable including an optical unit and a power line unit with little attenuation per length. Connected, communication signals from the BBU and PSU are supplied to the RRU through the optical unit constituting the opto-electric composite cable, and power is supplied to the RRU through the power line unit constituting the opto-electric composite cable.

Since the RRU can be installed just below the base station antenna at the top of the base station tower, the length of the coaxial feed line for supplying the signal converted into the RF signal by the RRU to the antenna is minimized, so that the RF generated when transmitting the RF signal through the coaxial line Since signal attenuation is not a problem, the amount of attenuation of the signal until just before radiation is minimized, and the need for a TMA that uses a lot of power consumption is eliminated. This technical feature has become a feature of RRH in terms of maintenance of the base station.

In the RRH, the RRU is spaced apart from the BBU and installed just below the base station antenna at the top of the base station tower. In preparation for this, a signal transmission line capable of confirming the operation state of the RRU is required, and a twisted pair is generally used as the signal transmission medium.

Since the twisted merchant wire must be additionally installed together with the opto-electric composite cable in the RRH system, there is a problem in that the construction time and cost increase. In addition, the twisted merchant wire may have performance degradation due to moisture, temperature, etc. from the outside due to the nature of being installed outdoors, and problems such as disconnection due to physical impact may occur.

The main object of the present invention is to improve the efficiency of the system by providing an optical fiber unit for transmitting and receiving optical signals and a power line unit for transmitting power at the same time to solve the above problems It aims to provide an opto-electric composite cable that can save time and cost when installing

An opto-electric composite cable according to an embodiment of the present invention, in the optical-electric composite cable for transmitting a mobile communication signal and power in a mobile communication base station having at least one base station equipment and at least one antenna, a conductor and an insulator surrounding the conductor at least one power line unit for transmitting the power; at least one optical fiber unit having an optical fiber and a tube accommodating the optical fiber and transmitting the mobile communication signal; a metal protective layer surrounding the power line unit and the optical fiber unit; an outer coating layer formed outside the metal protective layer; and a plurality of twisted pair units distributed among neighboring power line units; With a, the twisted pair unit can transmit an alarm signal to check whether the normal operation of the base station equipment.

In the present invention, the power line units may be arranged along the outer periphery of the optical fiber unit.

In the present invention, each of the twisted pair units may be distributed in each of the spaces formed by the neighboring power line units and the metal protective layer.

In the present invention, the twisted pair unit may be disposed within a common circumtangent of power line units adjacent to each other.

In the present invention, the power line units may circumscribe each other.

In the present invention, the power line unit and the optical fiber unit may have substantially the same diameter.

In the present invention, the metal protective layer may be formed with wrinkles that are repeatedly made of wrinkled peaks and wrinkled valleys.

In the present invention, when the power line units form a cable core disposed along the outer periphery of the optical fiber unit, the outer diameter of the cable core is Dc, the inner diameter of the corrugated mountain is Do, and the inner diameter of the corrugated valley is Di. , the relationship of Di < Dc ≤ Do may be satisfied.

In the present invention, a filler may be further provided in the empty space of the cable core.

In the present invention, when the base station equipment includes a remote radio unit (RRU), the twisted pair unit is connected to the RRU, and can transmit whether the RRU is operating normally to the mobile communication base station by a contact method. .

In the present invention, when the base station equipment includes a Tower Mounted Amplifier (TMA), the twisted pair unit is connected to the RRU and can transmit a control signal of the TMA.

In the opto-electric composite cable according to another embodiment of the present invention, in the optical-electric composite cable for transmitting a mobile communication signal and power in a mobile communication base station having at least one base station equipment and at least one antenna, a conductor and an insulator surrounding the conductor a plurality of power line units for transmitting the power; at least one optical fiber unit having an optical fiber and a tube accommodating the optical fiber and transmitting the mobile communication signal; a metal protective layer surrounding the power line unit and the optical fiber unit; and a twisted pair unit for transmitting an alarm signal for checking whether the base station equipment operates normally. and, the twisted pair unit may be distributed between neighboring power line units and between the neighboring power line units and the optical fiber unit.

In the present invention, it further includes a central tension line disposed at the center of the optoelectronic composite cable, and the power line units and the optical fiber unit may be arranged around the central tension line.

In the present invention, each of the twisted pair units is formed by spaces formed by the adjacent power line units and the metal protective layer, and the adjacent power line unit, the optical fiber unit, and the metal protective layer. It can be distributed in each of the spaces to be used.

In the present invention, the twisted pair unit may be disposed within a common circumtangent of the power line units adjacent to each other.

In the present invention, the twisted pair unit may be disposed within a common circumtangent line of the power line unit and the optical fiber unit adjacent to each other.

In the present invention, the power line units and the optical fiber unit may circumscribe each other.

In the present invention, the power line unit may have substantially the same diameter as the optical fiber unit.

In the present invention, the metal protective layer may be formed with wrinkles that are repeatedly made of wrinkled peaks and wrinkled valleys.

In the present invention, when forming a cable core in which the power line units and the optical fiber unit are arranged along the outer periphery of the central tension line around the central tension line, the outer diameter of the cable core is Dc, and the inner diameter of the corrugated mountain is When Do, the inner diameter of the wrinkled valley is Di, the relationship of Di < Dc ≤ Do may be satisfied.

In the present invention, a filler may be further provided in the empty space of the cable core.

In the present invention, when the base station equipment includes a remote radio unit (RRU), the twisted pair unit is connected to the RRU, and can transmit whether the RRU is operating normally to the mobile communication base station by a contact method. .

In the present invention, when the base station equipment includes a Tower Mounted Amplifier (TMA), the twisted pair unit is connected to the RRU and can transmit a control signal of the TMA.

According to an embodiment of the present invention, a conventional coaxial unit is provided simultaneously with a fiber optic unit for transmitting and receiving an optical signal, a power line unit for transmitting power, and a twisted pair unit for transmitting a signal that can check whether the base station equipment is operating or not. It is possible to improve the efficiency of the entire system by preventing the loss of the feed line, to reduce the cable laying time and cost, and to protect the optical fiber unit, the twisted pair unit, and the power line unit from external forces.

In addition, according to an embodiment of the present invention, a metal protective layer in the form of a corrugated pipe is provided, and the inner diameter of the corrugated pipe is configured to be smaller than the outer diameter of the inner cable core, so that the inner cable core is fixed by the metal protective layer. do. By this, even when the opto-electric composite cable according to an embodiment of the present invention is installed in a vertical direction, such as a tower, the cable core of the opto-electric composite cable is firmly fixed without the problem of moving downward by gravity. can be installed.

1 is a configuration diagram schematically showing the configuration of a mobile communication base station having an opto-electric composite cable according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view schematically showing the opto-electric composite cable shown in FIG. 1 .
FIG. 3 is a perspective view schematically illustrating the optoelectronic composite cable shown in FIG. 2 .
4 is a cross-sectional view schematically showing an optoelectronic composite cable according to another embodiment of the present invention.
5 is a perspective view schematically showing the optoelectronic composite cable shown in FIG.
6A is a longitudinal cross-sectional view schematically illustrating the metal protective layer shown in FIG. 2 .
Fig. 6b is a cross-sectional view schematically showing the cable core shown in Fig. 2;
6C is a cross-sectional view schematically showing the power line unit shown in FIG.
7 is a configuration diagram schematically showing the configuration of a mobile communication base station having an opto-electric composite cable according to another embodiment of the present invention.
8 is a cross-sectional view schematically showing the optoelectronic composite cable shown in FIG. 7 .
9 is a perspective view schematically illustrating the opto-electric composite cable shown in FIG. 7 .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed subject matter may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art. Like reference numerals refer to like elements throughout.

1 is a configuration diagram schematically showing the configuration of a mobile communication base station having an opto-electric composite cable 100 according to an embodiment of the present invention.

The RRU (Remote Radio Unit) is to compensate for the inefficient disadvantages of power consumption and maintenance of the mobile communication base station using the conventional TMA. Hereinafter, a system with an RRU will be described in detail with reference to the drawings.

Referring to FIG. 1, the mobile communication base station transmits and receives communication signals to and from a carrier's backbone station or a user's mobile phone, and receives power from a power supply source (eg, Korea Electric Power) (Base Transceiver Station, BTS) (10). ), the optical power cable 100 optically and electrically connecting the base station 10 and the remote radio unit (RRU) 40, and the optical fiber unit and the power line unit are separated from the optical power cable 100 An optical signal and The remote wireless unit 40 that receives power or transmits an optical signal to the optical fiber unit separated from the terminal box 70, receives a wireless communication signal from the remote wireless unit 40, or the remote wireless unit 40 ) may include an antenna 20 for transmitting a wireless communication signal.

As is well known, the optical fiber unit having the optical fiber has the advantage that the signal loss along the length of the cable is relatively very small compared to the coaxial cable. Accordingly, when the optical signal is transmitted as close as possible to the input unit of the antenna through the optical fiber, attenuation of the signal can be minimized. The remote wireless unit 40 is provided adjacent to the antenna input terminal, and serves to convert the optical signal transmitted through the optical fiber into an RF signal that can be radiated from the antenna. Accordingly, the amount of attenuation due to the loss of the signal applied to the antenna is reduced to a minimum, and it is possible to omit the conventional TMA, which consumes a lot of power.

After all, the photoelectric composite cable 100 according to an embodiment of the present invention is connected from the base station 10 to the remote wireless unit 40 and is applied to the optical fiber unit 130 having an optical fiber and the remote wireless unit 40 . It may be provided as a hybrid cable having a power line unit 110 that transmits power to be used. When such an opto-electric composite cable 100 is used, it is relatively easy to install in a tower equipped with an antenna compared to a structure in which an optical fiber unit and a power line unit are separated, and a plurality of remote wireless units 40 are connected to a single terminal box 70 ), so the installation cost is relatively reduced.

In addition, the photoelectric composite cable 100 according to an embodiment of the present invention may include the optical fiber unit 130 and the power line unit 110 and the twisted pair unit 160 at the same time, and the twisted pair unit 160 is remote Whether the wireless unit 40 operates normally may be notified to the BBU 10 . That is, the twisted pair unit 160 may be connected to the remote wireless unit 40 to transmit a contact-type alarm signal to the BBU 10 . When the remote wireless unit 40 operates normally, the alarm signal is not transmitted to the BBU 10 , but when there is an abnormality in the operation of the remote wireless unit 40 , the contact-type alarm signal is transmitted to the twisted pair unit 160 . may be transmitted to the BBU 10 through Accordingly, it is possible to easily determine whether the remote radio unit 40 disposed under the antenna positioned at the top of the base station tower is in operation from the BBU 10 positioned at the bottom of the base station tower.

In addition, when the optical fiber unit 130 , the power line unit 110 , and the optical power composite cable 100 having the twisted pair unit 160 are used at the same time, they are installed in a tower equipped with an antenna compared to the structure in which they are separated from each other. Relatively easy to install, it is possible to reduce the installation cost and installation time, and since the optical fiber unit 130 and the twisted pair unit 160 having a relatively smaller diameter than the power line unit 110 are included in the optical power composite cable 100, external It is possible to protect the twisted pair unit 160 from environmental factors.

Hereinafter, the configuration of the photoelectric composite cable 100 will be described with reference to the drawings.

FIG. 2 is a cross-sectional view schematically showing the opto-electric composite cable shown in FIG. 1 , and FIG. 3 is a perspective view schematically showing the opto-electric composite cable shown in FIG. 2 .

2 and 3 , the optoelectronic composite cable 100 may include a cable core 105 and an outer skin layer 150 surrounding the cable core 105 .

The cable core 105 may include a plurality of power line units 110 for supplying power, a plurality of optical fiber units 130 for transmitting optical signals, and a twisted pair unit 160 . In addition, the cable core 105 fills the gap between the plurality of power line units 110 , the optical fiber unit 130 , and the twisted pair unit 160 , and the outer periphery further includes a filler 120 having a circular shape. can do.

The outer skin layer 150 may include a metal protective layer 151 in which pleats 152 are formed in which corrugated mountains 152A and corrugated valleys 152B are repeatedly formed so as to surround the cable core 105 . Furthermore, the cable core 105 may further include a nonwoven tape (not shown) surrounding the outer periphery of the cable core 105 .

Each of the power line units 110 may include a conductor 113 and an insulator 115 surrounding the conductor 113 . The power line unit 110 may have a shape conforming to a standard used for general power, and the plurality of conductors 113 may have a twisted shape. In addition, the conductor 113 may be made of a metal such as copper or aluminum, and the insulator 115 may be made of a polymer resin such as polyethylene, polypropylene, or polyvinyl chloride.

The optical fiber unit 130 may be configured in any shape including an optical fiber for transmission of an optical signal, for example, at least one optical fiber 133 , and a tube 135 accommodating the optical fiber 133 . may include. The tube 135 may be made of, for example, polybutylene terephthalate (PBT), polypropylene, polyethylene, or polyvinyl chloride. In addition, a filler may be additionally filled in the tube 135 . For example, jelly may be filled, or the tension member 137 such as aramid yarn may be filled. The tension member 137 has excellent tensile force and is flexible, so that the cable can be stably installed.

The twisted pair unit 160 may have a shape in which two transmission lines made of a conductor and an insulator surrounding the conductor are twisted together. The twisted pair unit 160 may be distributed among neighboring power line units 110 . As each of the twisted pair units 160 is disposed in the space between the power line units 110 , it can contribute to maintaining the shape of the opto-electric composite cable 100 in a circular shape.

In addition, the twisted pair unit 160 may be disposed within a common circumscribed line L of the power line units 110 adjacent to each other. That is, the twisted pair unit 160 may be disposed in a space formed by the common circumscribed line L and the outer peripheral surfaces of the power line units 110 adjacent to each other. As such, the twisted pair unit 160 is disposed on the common external tangent line L, so that it is spaced as far as possible from the metal protective layer 151. As a result, the shock transmitted to the twisted pair unit 160 from the outside is alleviated to form an external shock. It is possible to reduce the risk of disconnection of the twisted pair unit 160 due to this.

On the other hand, the outer skin layer 150 provided on the outermost side of the opto-electric composite cable 100 is a part that forms the outer shape of the opto-electric composite cable 100, and the optical fiber unit 130 included in the opto-electric composite cable 100, the power line unit 110 , and the twisted pair unit 160 may be protected. For example, the outer skin layer 150 is inscribed in the cable core 105, surrounds the cable core 105 in a circular shape and protects the cable core 105 from external impact. A metal protective layer 151 and the An outer coating layer 155 surrounding the metal protective layer 151 may be included.

The metal protective layer 151 has a corrugated shape in which corrugated peaks 152A and corrugated valleys 152B are repeatedly formed, and may be formed of a metal pipe such as aluminum. Looking at the method of forming the metal protective layer 151, a plate-type metal plate is supplied together with a cable core including an optical fiber unit, a power line unit, and a twisted pair unit, and the metal plate is rolled to the outside of the cable core. After forming to surround the metal plate, both ends of the abutting metal plate are joined by welding or the like to form a pipe having a predetermined diameter. Then, it is pressed at predetermined intervals to form a corrugation on the outside of the pipe. _{In this case, the relationship between the inner diameter (D i} ) of the corrugated bone 152B and the outer diameter (D _c ) of the cable core 105 is important, which will be described in detail later.

However, if there is no wrinkle or when using an optoelectronic composite cable formed to surround the cable core with a tape-shaped metal protective layer that is wrinkled in advance, when the cable is installed vertically, the cable core moves without being fixed as in the prior art. will still occur. In addition, the metal protective layer according to an embodiment of the present invention may be formed of a material having a rigidity so as to hold the cable core tightly and fix it.

Meanwhile, the outer coating layer 155 may be made of an environmentally friendly resin having flame retardant properties. For example, the outer coating layer 155 may be made of polyethylene, polypropylene, or polyvinyl chloride (PVC).

The cable core 105 may further include a nonwoven tape (not shown) that surrounds the outer periphery of the cable core 105 and surrounds the power line unit 110 and the optical fiber unit 130 in a circular shape. The non-woven tape is arranged in a form of wrapping the optical fiber unit and the power line unit therein with a compression nonwoven fabric. The nonwoven tape may be formed by transversing or longitudinally attaching a material in the form of a tape.

Meanwhile, in the photoelectric composite cable 100 , the voids in the cable core 105 may be filled with the filler 120 . That is, since the power line unit 110 has a circular shape, a gap is generated between adjacent power line units. In this configuration, since the overall outer shape of the photoelectric composite cable 100 does not maintain a circular shape, it is vulnerable to bending or impact acting from the outside. Accordingly, it is possible to have a structure that can withstand external shocks by filling the voids in the cable core 105 with the filler 120 and maintaining the outer shape of the filler 120 in a circular shape.

On the other hand, looking at the internal configuration of the photoelectric composite cable 100 shown in FIG. 2 , a plurality of optical fiber units 130 are disposed inside the cable core 105 , and along the outer periphery of the optical fiber unit 130 . It can be seen that the power line units 110 are disposed. Comparing the optical fiber unit 130 and the power line unit 110, since the optical fiber 133 provided in the optical fiber unit 130 is relatively more vulnerable to bending or disconnection, the optical fiber unit 130 is provided inside to protect it. do. In this case, a protective layer 140 surrounding and protecting the plurality of optical fiber units 130 may be further provided between the plurality of power line units 110 and the optical fiber unit 130 .

In addition, a central tension line 145 may be provided in the central portion of the opto-electric composite cable 100 to prevent the opto-electric composite cable 100 from being bent more than necessary. The central tension line 145 is located in the central portion of the opto-electric composite cable 100 and provides a repulsive force that repulses when a bending force acts on the optical-electric composite cable 100, so that the optical-electric composite cable 100 is more than necessary. It prevents it from being bent and serves to support the contraction of the tube according to the temperature change. Accordingly, damage to the optical fiber unit 130 can be prevented.

4 is a cross-sectional view schematically showing an opto-electric composite cable 50 according to another embodiment of the present invention, and FIG. 5 is a perspective view schematically showing the opto-electric composite cable 50 of FIG. 4 . Compared with the description of FIG. 2 described above, the same reference numerals are shown for the same components, and repeated descriptions are omitted.

4 and 5 , the opto-electric composite cable 50 shown in FIGS. 4 and 5 may include two power line units 110 , one optical fiber unit 130 , and a twisted pair unit 160 . . The photoelectric composite cable 50 shown in FIGS. 4 and 5 is the photoelectric cable of FIG. 2 described above in that the power line units 110 and the optical fiber unit 130 are arranged along the outer periphery of the central tension line 145 as the center. There is a difference from the composite cable (100). In addition, in that each of the twisted pair units 160 is distributedly disposed between the power line units 110 and between the power line unit 110 and the optical fiber unit 130, the optical power composite cable 100 of FIG. 2 and There is a difference.

The opto-electric composite cable 50 shown in FIGS. 4 and 5 may be used to connect the terminal box 70 shown in FIG. 1 and the remote wireless unit 40 . That is, the two power line units 110 of the opto-electric composite cable 50 transmit power to the remote wireless unit 40, and the optical fiber unit 110 can transmit an RF signal to the remote wireless unit 40. Also, The twisted pair unit 160 may transmit a signal indicating whether the remote wireless unit 40 is in a normal operating state to the BBU 10 in a contact alarm method.

The twisted pair unit 160 may be distributed between neighboring power line units 110 and between neighboring power line units 110 and optical fiber units 130 .

On the other hand, the above-described opto-electric composite cables 100 and 50 are basically installed in a vertical direction along a tower equipped with an antenna, and further include a copper conductor for power transmission with a large weight therein. It was recognized that a structure capable of fixing the fiber optic unit and the power line unit was needed. If an optoelectronic composite cable is used that has no wrinkles or is formed to surround the cable core with a tape-shaped metal protective layer that has been previously wrinkled, the problem that the cable core moves without being fixed as in the prior art when the cable is installed vertically will still occur.

For example, if the power line unit or optical fiber unit is separated from the outer layer of the opto-electric composite cable by its own weight in the case of installing the opto-electric composite cable in the vertical direction along the tower, it takes a lot of time to install the optical composite cable as well as A process of recovering the photoelectric composite cable is required, and thus the efficiency of the operation is significantly reduced. Therefore, in the following, a configuration of an optoelectronic composite cable for solving the above problems will be described.

Figure 6a is a longitudinal cross-sectional view schematically showing the metal protective layer 151 of the optoelectric composite cable 100 shown in Figure 2, Figure 6b is a metal protective layer 151 in the optoelectric composite cable 100 shown in Figure 2 and a cross-sectional view schematically showing the cable core 105 from which the outer covering layer 155 has been removed.

Referring to FIG. 6A , the metal protective layer 151 is provided in the form of a pipe made of a metal material such as aluminum, and as described above, the corrugated corrugations 152A and the corrugated valleys 152B are repeatedly formed. ) is formed. 6A and 6B, the metal protective layer 151 is disposed to surround the outside of the cable core 105, and the inner diameter Do and wrinkles of the corrugated mountain 152A of the metal protective layer 151 The relationship between the inner diameter (D _i ) of the trough (152B) and the outer diameter (Dc) of the cable core 105 of the opto-electric composite cable 100 acts as an important factor.

_{If the inner diameter (D i} ) of the corrugated trough 152B is larger than the outer diameter Dc of the cable core 105, or is determined to be the same size, the cable core 105 by the corrugated trough 152B The fixation effect will be very small. Therefore, the power line unit 110 and the optical fiber unit 130 located inside the cable core 105 are not fixed in the same way, and when the opto-electric composite cable 100 is installed, the power line unit 110 and the optical fiber unit 130, and the twisted pair unit 160 may not solve the problem of moving in the skin layer. Therefore, in the photoelectric composite cable 100 according to an embodiment of the present invention, the inner diameter (D _i ) of the corrugated valley 152B of the metal protective layer 151 is smaller than the outer diameter (Dc) of the cable core 105 . can be decided to In this case, the inner diameter Do of the corrugated mountain 152A may be determined to be greater than or equal to the outer diameter Dc of the cable core 105 ′. That is, the inner diameter of the corrugated mountain 152A may be the same as or greater than the outer diameter Dc of the cable core 105 .

As a result, the inner diameter (Do) of the corrugated mountain (152A) of the metal protective layer 151 and the inner diameter (D _i ) of the corrugated valley (152B), and the outer diameter (Dc) of the cable core 105 of the optical power composite cable 100 ) can be expressed by [Equation 1] as follows.

As a result, when the corrugated mountain 152A and the corrugated trough 152B of the metal protective layer 151 are formed, the inner diameter (D _i ) of the corrugated trough 152A is greater than the outer diameter (Dc) of the cable core 105 . It is determined to be small, and the inner diameter (Do) of the corrugated mountain (152A) may be determined to be greater than or equal to the outer diameter (Dc) of the cable core (105). Accordingly, the power line unit 110, the optical fiber unit 130, and the twisted pair unit 160 disposed on the inside of the cable core 105 by the shape of the corrugation 152B of the metal protective layer 151 are formed. can be fixed.

_{However, when the inner diameter (D i} ) of the corrugated trough 152B of the metal protective layer 151 is smaller than the outer diameter (Dc) of the cable core 105 as described above, the corrugated trough 152 is the cable core ( Since the 105 is pressurized, the power line unit 110 of the cable core 105 may be damaged. _{Therefore, the inner diameter (D i} ) of the corrugated valley 152B of the metal protective layer 151 may be determined to prevent damage to the power line unit 110, on the one hand, the cable core 105 or the power line unit ( 110 ) may be determined to prevent separation from the metal protective layer 151 .

Meanwhile, as described above, the power line unit 110 may include a conductor 113 in the central portion and an insulator 115 surrounding the conductor 113 . Therefore, when pressed by the corrugated trough 152B of the metal protective layer 151, the corrugated trough 152B of the metal protective layer 151 is the thickness (T) of the insulator 115 of the power line unit 110 . _p , see FIG. 6c ), the power line unit 110 may be damaged. Furthermore, when the power line unit 110 is disposed along the outer periphery of the optical fiber unit as shown in FIG. 2 , the power line unit 110 may be symmetrically provided on both sides around the central portion of the optoelectric composite cable 100 . Therefore, it is preferable not to press the corrugated valley 152B more than the thickness of the insulator 115 of the two power line units 110 disposed on both sides around the central portion of the opto-electric composite cable 100 . As a result, the inner diameter (D _i ) of the corrugated bone 152B may be determined to further satisfy the condition shown in Equation 2 below.

On the other hand, as described in FIG. 1 , the photoelectric composite cable 100 is connected from the BBU 10 to the remote wireless unit 40 through the terminal box 70 . In this case, the photoelectric composite cable 100 is a power line unit 110, an optical fiber unit 130, and a twisted pair unit 160 are branched from the terminal box 70, and the remote wireless unit 40) can be appropriately combined. For example, one optical fiber unit 130, a pair of power line units 110, and one twisted pair unit 160 form one combination inside the terminal box 70, and in the combination A connection cable according to the above may be connected to the above-described remote wireless unit 40 .

Alternatively, the terminal box 70 and the remote wireless unit 40 may be connected by an opto-electric composite cable 50 shown in FIG. 4 . That is, as shown in FIG. 4 , a terminal box 70 with an opto-electric composite cable 50 consisting of a pair of power line units 110 , one optical fiber unit 130 , and a plurality of twisted pair units 160 . and the remote wireless unit 40 may be connected.

7 is a configuration diagram schematically showing the configuration of a mobile communication base station having an opto-electric composite cable 200 according to another embodiment of the present invention.

The mobile communication base station shown in FIG. 7 is different from the mobile communication base station shown in FIG. 1 in that it includes not only the remote radio unit 60 but also the TMA. That is, when a new mobile communication base station is established, or in the case of a base station relaying 3rd or 4th generation mobile communication, as shown in FIG. 70), and the opto-electric composite cable 100 is branched into another optical-electric composite cable 50 in the terminal box 70 and can be connected to the remote wireless unit 40 located under the antenna 20. However, as shown in FIG. 7, there may already be a base station built using the BTS 10 ', the TMA 60, and the coaxial cable 300 connecting them for 2nd or 3rd generation mobile communication, In the case of implementing a new communication method of 3G or 4G mobile communication by utilizing such a base station system, a new communication method is already installed in the base station tower consisting of the BTS 10', the TMA 60, and the coaxial cable 300 connecting them. Antenna 20 and remote wireless unit 40, and an opto-electric composite cable 200 connecting them can be added.

When the distance between the remote radio unit 40 and the antenna 20 is considerable, the TMA 60 may be additionally disposed in the remote radio unit 40 and the antenna 20 as shown in FIG. 7 , the TMA Reference numeral 60 amplifies the strength of a signal transmitted from the remote wireless unit 40 to the antenna 20 .

In this case, the photoelectric composite cable 200 connecting the BBU 10 and the remote wireless unit 40 may be as shown in FIGS. 8 and 9 .

8 is a cross-sectional view schematically showing the opto-electric composite cable shown in FIG. 7 , and FIG. 9 is a perspective view schematically showing the opto-electric composite cable shown in FIG. 7 .

8 and 9 , the opto-electric composite cable 200 may include a pair of power line units 110 , two optical fiber units 130 , and four twisted pair units 160 . The pair of power line units 110 supplies power to the remote wireless unit 40 , and the optical fiber unit 130 may transmit an RF signal to the remote wireless unit 40 . One of the two optical fiber units 130 may be spare. As described above, the twisted pair unit 160 may transmit a signal whether or not the remote wireless unit 40 is in normal operation to the BBU 10 through the contact alarm. Also, the twisted pair unit 160 may be connected to the TMA 60 to transmit a control signal for controlling the TMA 60 .

As described above, the optical-electric composite cable according to an embodiment of the present invention is a twisted pair for transmitting a signal capable of confirming the operation of a fiber optic unit for transmitting and receiving an optical signal, a power line unit for transmitting power, and a base station equipment. By providing the unit at the same time, it is possible to improve the efficiency of the entire system by preventing the loss of the conventional coaxial feed line, reduce the cable laying time and cost, and protect the optical fiber unit, twisted pair unit, and power line unit from external forces can do.

In addition, the photoelectric composite cable according to an embodiment of the present invention has a metal protective layer in the form of a corrugated pipe, and the inner diameter of the corrugated pipe is configured to be smaller than the outer diameter of the inner cable core, and the inner cable core by the metal protective layer to be fixed. By this, even when the opto-electric composite cable according to an embodiment of the present invention is installed in a vertical direction, such as a tower, the cable core of the opto-electric composite cable is firmly fixed without the problem of moving downward by gravity. can be installed.

Although the present specification has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims described below. will be able to carry out Therefore, if the modified implementation basically includes the elements of the claims of the present invention, all of them should be considered to be included in the technical scope of the present invention.

100..Optoelectric composite cable
105..Cable Core
110..Power line unit
113..Conductor
115..insulator
130..Fiber optic unit
133. Fiber Optic
135..tube
137..Tension member
200..Terminal box

Claims (23)

In the optical power composite cable for transmitting mobile communication signals and power in a mobile communication base station having at least one or more base station equipment and at least one antenna,
at least one power line unit having a conductor and an insulator surrounding the conductor and transmitting the power;
at least one optical fiber unit having an optical fiber and a tube accommodating the optical fiber and transmitting the mobile communication signal;
a metal protective layer surrounding the power line unit and the optical fiber unit;
an outer coating layer formed outside the metal protective layer; and
a plurality of twisted pair units for transmitting an alarm signal capable of confirming whether the base station equipment operates normally; is provided,
The optical fiber unit and the power line units constitute a cable core, and each of the twisted pair units is filled with a filler in spaces formed by neighboring power line units and the metal protective layer, and power lines adjacent to each other. Distributed within the common circumscribed line of units and buried between the fillers, the optoelectric composite cable, characterized in that it is disposed in a non-contact state with the power line unit, the optical fiber unit, and the metal protective layer. According to claim 1,
The power line units are optical power composite cables, characterized in that arranged along the outer periphery of the optical fiber unit. delete delete According to claim 1,
The power line units are an opto-electric composite cable, characterized in that the outer contact with each other. According to claim 1,
The power line unit and the optical fiber unit have substantially the same diameter. According to claim 1,
The metal protective layer is an opto-electric composite cable, characterized in that the corrugation is formed repeatedly consisting of corrugated mountains and corrugated valleys. 8. The method of claim 7,
The power line units constitute a cable core disposed along the outer periphery of the optical fiber unit,
When the outer diameter of the cable core is Dc, the inner diameter of the corrugated mountain is Do, and the inner diameter of the corrugated valley is Di,
An opto-electric composite cable, characterized in that it satisfies the relationship of Di < Dc ≤ Do. delete According to claim 1,
The base station equipment includes a remote radio unit,
The twisted pair unit is connected to the remote wireless unit, the optical power composite cable, characterized in that it can transmit whether the normal operation of the remote wireless unit to the mobile communication base station by a contact alarm method. According to claim 1,
The base station equipment includes a TMA (Tower Mounted Amplifier),
The twisted pair unit is connected to the remote wireless unit, the optical power cable, characterized in that for transmitting the control signal of the TMA. In the optical power composite cable for transmitting mobile communication signals and power in a mobile communication base station having at least one or more base station equipment and at least one antenna,
a plurality of power line units having a conductor and an insulator surrounding the conductor and transmitting the power;
at least one optical fiber unit having an optical fiber and a tube accommodating the optical fiber and transmitting the mobile communication signal;
a metal protective layer surrounding the power line unit and the optical fiber unit; and
a twisted pair unit for transmitting an alarm signal that can check whether the base station equipment operates normally; is provided,
Further comprising a central tension line disposed in the center of the photoelectric composite cable,
The power line units and the optical fiber unit are arranged around the central tension line,
A filler is filled between spaces formed by the adjacent power line units and the metal protective layer and the spaces formed by the adjacent power line units, the optical fiber unit, and the metal protective layer, and the twisted pair The unit is dispersed within the common circumscribed line of the power line units adjacent to each other and buried between the fillers to be disposed in a non-contact state with the power line unit, the optical fiber unit, and the metal protective layer. delete delete delete 13. The method of claim 12,
The twisted pair unit is an opto-electric composite cable, characterized in that it is disposed within a common circumtangent line of the adjacent power line unit and the optical fiber unit. 13. The method of claim 12,
The power line units and the optical fiber unit are externally connected to each other. 13. The method of claim 12,
The power line unit has substantially the same diameter as the optical fiber unit. 13. The method of claim 12,
The metal protective layer is an opto-electric composite cable, characterized in that the corrugation is formed repeatedly consisting of corrugated mountains and corrugated valleys. 20. The method of claim 19,
forming a cable core in which the power line units and the optical fiber unit are disposed along the outer periphery of the central tension line around the central tension line;
When the outer diameter of the cable core is Dc, the inner diameter of the corrugated mountain is Do, and the inner diameter of the corrugated valley is Di,
Optoelectric composite cable, characterized in that it satisfies the relationship Di < Dc ≤ Do delete 13. The method of claim 12,
The base station equipment includes a remote radio unit,
The twisted pair unit is connected to the remote wireless unit, the optical power composite cable, characterized in that it can transmit whether the normal operation of the remote wireless unit to the mobile communication base station by a contact alarm method. 13. The method of claim 12,
The base station equipment includes a TMA (Tower Mounted Amplifier),
The twisted pair unit is connected to the remote wireless unit, the optical power cable, characterized in that for transmitting the control signal of the TMA.

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