KR20220029517A - Power Over Ethernet Cable - Google Patents

Abstract

The present invention relates to a PoE cable that satisfies a power over ethernet plus (PoE+) power transmission characteristic and a 1Gbps data transmission speed without an amplification device such as an additional hub and the like at a distance of up to 200 meters, and can apply an existing commercial connector. The PoE cable comprises: a plurality of pair units; and an external jacket.

Description

PoE Cable {Power Over Ethernet Cable}

The present invention relates to a PoE cable. More specifically, the present invention satisfies PoE+ (Power Over Ethernet Plus) power transmission characteristics and 1Gbps data transmission speed without an amplification device such as an additional hub at a distance of up to 200 meters, and provides a PoE cable to which an existing commercial connector can be applied. it's about

The Ethernet power supply (PoE) function refers to a networking function capable of supplying power defined by the IEEE 802.3af or 802.3at standard. If an Ethernet cable that meets the Ethernet Power Supply (PoE) standard is used, it is possible to supply power to network devices through the Ethernet cable for existing data communication, so the utilization is increasing.

In order to use Ethernet power supply (PoE), both ends of the Ethernet cable may be connected to a power supply device (PSE) and a power receiver (PD) to supply power along with Ethernet communication.

The power supply device (PSE) may be configured in the form of a network switch or, in the case of a switch without a PoE function, may be an Ethernet power supply (PoE) injector added to the switch, and the power receiving device (PD) may be a VoIP phone, wireless access It may be a device that requires both power supply and data communication, such as a point or IP camera.

The conventionally introduced PoE cable mainly used a general-purpose Ethernet cable with a Cat.5e grade or higher, and the conductor size is 23~24AWG. was used for

However, due to the limitation of the power transmission distance of 100 m, the utility is poor, and recently, a method for overcoming the limitation of the transmission distance of 100 m has been attempted.

For example, when considering the power transmission of IEEE 802.3 at standard (referred to as PoE+) at a distance of 200 m, a method to reduce the resistance of the conductor by increasing the diameter of the conductor covered with an insulator in the construction of a PoE cable or the power supply (PSE) ) or a method of using a power amplifier such as a separate additional hub in addition to the power receiving device (PD) was considered.

In relation to the former method of increasing the diameter of the conductor in order to extend the power transmission distance of the PoE cable, in US Patent US10/453589 and US Patent Publication US2020-0043634, a technique for increasing the conductor size to 20~22AWG was introduced. , As the outer diameter and cost of PoE cables increase, and as the outer diameter increases, the existing commercial connector RJ45 standard plug cannot be applied, so there is a problem that a separate dedicated RJ45 standard plug must be applied.

The latter method of installing a separate additional hub to increase the power transmission distance of the PoE cable requires the installation of an additional hub on the line. It causes an increase in the overall cost of the PoE system due to an increase in time and the like.

An object of the present invention is to provide a PoE cable that satisfies PoE+ (Power Over Ethernet Plus) power transmission characteristics at a distance of up to 200 meters without an amplification device such as an additional hub and can apply an existing commercial connector. .

In addition, it is a task to solve the problem to provide a PoE cable that satisfies 1Gbps data transfer rate with PoE+ (Power Over Ethernet Plus) power transfer capability up to 200 meters.

In order to solve the above problems, the present invention is a PoE cable that connects between a power supply device and a power receiver device and enables power transmission while data communication, a pair of conductive wires including a conductor having a diameter of 23 AWG and an insulator surrounding the same a plurality of pair units twisted to have the opposite pitch; and an outer jacket surrounding the plurality of pair units, wherein the plurality of pair units are twisted to have a set pitch, and a minimum interstitial pitch among interplay pitches of the plurality of pair units is 12 mm to 15 mm, and a maximum interstitial pitch It is possible to provide a PoE cable, characterized in that the pitch is twice or more of the minimum parallel pitch, and the cable outer diameter is 6.2mm or less.

In addition, the conductor resistance of the conducting wire may be 12.5Ω or less based on the cable length of 200mm.

In addition, the plurality of pair units may be in contact with adjacent pair units, respectively.

Here, the diameter of the conductor constituting the conducting wire of the pair unit may be 0.59 mm to 0.61 mm.

In this case, the insulating outer diameter of the conducting wire of the pair unit may be 1.0 mm to 1.1 mm.

In addition, the average of the pitch of each of the plurality of pair units may be 17 mm to 22 mm.

In addition, a set pitch of the plurality of pair units may be 80 mm to 120 mm.

Here, power consumption of the PoE cable may be 4.5W or less when transmitting power based on a cable length of 200m.

According to the PoE cable according to the present invention, PoE+ (Power Over Ethernet Plus) power is transmitted at a distance of up to 200 meters without an amplification device such as an additional hub by controlling the diameter of the conductor of the PoE cable, the diameter of the PoE cable, and the parallel pitch of each pair unit. It is possible to provide a PoE cable with a minimized increase in diameter that satisfies the characteristics.

In addition, according to the PoE cable according to the present invention, an increase in the outer diameter thereof is minimized, so that a PoE patch cord can be configured by applying an RJ45 standard plug, which is an existing commercial connector.

In addition, according to the PoE cable according to the present invention, it is possible to provide a PoE cable satisfying 1Gbps data transmission characteristics.

1 shows a cross-sectional view of a PoE cable according to the present invention.
2 is a configuration diagram of test equipment (FLUKE DSX-8000, TP cable verifier) for evaluating conductor resistance (R), near-end crosstalk (NEXT) and insertion loss (IL) by connecting to both sides of each 200-meter test cable shows
FIG. 3 shows a system for testing the PoE performance of an Ethernet cable through whether the IP camera operates normally by setting the length of the PoE cable between the network switch and the IP camera to be 200 m.
4 to 6 show test graphs of insertion loss based on the cable length of 200 meters of Comparative Examples 1 and 2 and the present invention.
7 to 9 are test graphs showing the relationship between the near-end crosstalk (NEXT) and insertion loss for each pair of Comparative Examples 1, 2, and Examples of the present invention.

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 invention may be sufficiently conveyed to those skilled in the art. Like reference numbers refer to like elements throughout.

1 shows a cross-sectional view of a PoE cable 100 according to the present invention.

The PoE cable 100 according to the present invention shown in FIG. 1 includes a pair of conductor wires 10 including a conductor 11 and an insulator 12 surrounding the conductor 11, which are twisted to have a wide pitch. Four pair units 20 ; and a cable jacket 30 surrounding the pair unit 20 as a whole.

Generally, Ethernet cables used as PoE cables refer to LAN cables such as UTP (unshielded twisted pair) cables, FTP (Foiled Twisted Pair) or STP (Shielded Twisted Pair) cables, and are generally standard signal lines connected to a LAN card. .

Such an Ethernet cable may include a core configured to include a plurality of pair units and a cable jacket wrapped to protect the outside of the core.

In addition, Ethernet cables can be classified into categories (Category; abbreviated as Cat.) grades according to the level of transmission speed (Mbps) and transmission band (MHz) of communication signals, and Cat. 3 to Cat.8 graded communication cables are being introduced. Specifically, the higher the transmission speed (Mbps) and transmission band (MHz) transmitted by the communication cable, the higher the category (Category).

A Cat.5e grade Ethernet cable has a transmission speed of 400Mbps and a transmission band of 100MHz, and a Cat.6 grade Ethernet cable has a transmission speed of 1Gbps and a transmission band of 250MHz.

Such an Ethernet cable can be used as a PoE cable when it provides a networking function capable of supplying power as defined in IEEE 802.3af or 802.3at, which is an Ethernet power supply (PoE) standard, and the present invention provides an outer diameter even though the power transmission distance is improved. It relates to a PoE cable with minimal increase.

PoE cable 100 according to the present invention comprises a pair unit 20 by twisting a pair of conductive wires 10 formed by covering a conductor 11 with an insulator 12 to have a predetermined twist pitch, and a plurality of pairs The unit 20 may be configured to be accommodated in the cable jacket 30 . At this time, the plurality of pair units 20 may be twisted to have different interplay pitches, respectively.

In addition, a plurality of pair units 20 may be twisted at once to form an aggregate, and the twist pitch at this time is referred to as an aggregate pitch.

Here, the conductor 11 constituting the conducting wire 10 may be made of a copper material for transmission of data converted into an electrical signal, and the insulator 12 may be LDPE (Low Density Polyethylene) or HDPE (High Density Polyethylene). ), FEP (Flourinated Ethylene Prophylene), etc., can be composed of a low dielectric constant and easy to process polymer, and since heat may be present when energized, flame retardancy is also considered and the material and thickness (insulation outer diameter) can be determined.

In addition, the PoE cable 100 according to the present invention may be configured to include a cable jacket 30 configured to surround the plurality of pair units 20 to form an external appearance. The cable jacket 30 may be generally made of an insulating material such as polyethylene, PVC, or an olefin-based polymer material, and the thickness thereof may be configured to have a value in the range of 0.4 to 0.5 mm.

The PoE cable 100 according to the present invention is configured to be slightly larger within the range of 23 to 24 AWG, which is the conductor diameter of the PoE cable 100, in which the diameter of the conductor 11 is conventionally used, as will be described later, while each conductor ( 10) the insulation outer diameter (d) is 1.0 millimeter (mm) to 1.1 millimeter (mm), and for the application of the existing commercial connector, the total outer diameter (D) of the PoE cable 100 is 6.2 millimeters (mm) or less. The thickness of the cable jacket may be determined.

Here, the cable jacket 30 not only mechanically protects the plurality of pair units 20, but also secures a separation distance from alien interference (Alien Crosstalk) caused by electromagnetic waves generated from other adjacent cables or other electronic equipment. Provides the ability to mitigate the impact.

PoE cable 100 according to the present invention is designed to provide a PoE power transmission function capable of overcoming the conventional distance limitation of up to 100 meters (m), but the conductor 11 diameter and twist pitch are designed, but the existing commercial connector In order to maintain the outer diameter of the PoE cable 100 to 6.2 millimeters (mm) or less, the separator disposed in the center of the pair unit 20 was omitted.

Specifically, in order to enable the PoE cable 100 according to the present invention to transmit power according to the PoE+ IEEE 802.3at standard up to 200 m, a pair of conductors 11 with a diameter of 23 AWG and an insulator 12 surrounding them. The pair unit 20 may be configured by twisting the conducting wire 10 .

When the diameter of the conductor 11 constituting the conducting wire 10 is increased, R (resistance) is sequentially decreased, the attenuation is decreased (margin is improved), and the impedance value is decreased, whereas the diameter of the conductor 11 is decreased. When it is decreased, the R (resistance) value is increased, the attenuation amount is increased (margin is decreased), and the characteristic impedance value (Zo) is increased.

And, with respect to the insulation outer diameter (d), which is the diameter of the conductor wire (10), when the insulation outer diameter (d) is increased, the C (capacitance) value of the communication cable is sequentially reduced, the attenuation amount is reduced (margin improvement), characteristic impedance When the value Zo is increased, while the insulating outer diameter d is decreased, the C (capacitance) value increases, the attenuation increases (margin decreases), and the characteristic impedance value Zo tends to decrease.

In addition, the method of increasing the diameter of the conductor 11 to expand the PoE transmission distance is a method of reducing the conductor 11 resistance, and the conductor 11 resistance is proportional to the length of the conductor 11 and the PoE cable 100 ), since the length of the conductor 11 is in inverse proportion to the twist pitch, it is preferable to configure the long twist pitch in order to increase the PoE transmission distance.

First, the diameter of the conductor 11 is examined.

The meaning that the diameter of the conductor 11 is 23 AWG is specified in Table 5 of the UL 444 (Communication Cable) standard and is defined as 0.546 mm to 0.610 mm in the standard. The conductor constituting the pair unit of the PoE cable according to the present invention is a condition for enabling power transmission of PoE + IEEE 802.3 at standard based on a cable length of 200 m. Since the conductor resistance is 12.5 Ω or less, the diameter of the conductor 11 is preferably It is preferably 0.590 mm to 0.610 mm in consideration of the margin.

As a method of supplying power through a PoE cable, there is a Model A method that supplies both power and data through two pair units and a Model B method that supplies only power to two pair units that were not used for data communication. Although each of the two models has advantages and disadvantages, they are common in that they each supply DC power through a pair of pair units.

The existing PoE standard IEEE 802.3af standard has a PSE (Power Sourcing Equipment) standard supply power of 15.4W and a PD (Power Device) standard receive power of 12.95W so that the maximum supply current is 350mA. As more power is required, the PoE+ IEEE 802.3at standard stipulates that the maximum PSE (Power Sourcing Equipment) standard supply power is 30.0W and the PD (Power Device) standard receive power is 25.5W so that the maximum supply current is 600mA.

In the end, the PoE+ IEEE 802.3at standard means that power loss of 4.5w or less must be generated through resistance through the conductor constituting the pair unit.

In addition, the PoE IEEE 802.3af standard and the PoE+ IEEE 802.3 at standard are regulated based on a range of 100 m, but the PoE cable according to the present invention means that it is possible to supply power according to the PoE+ IEEE 802.3 at standard up to 200 meters, and eventually 200 meters As a standard, it means that the power loss due to the resistance according to the 600mA supply current should be 4.5W or less.

Therefore, the power loss due to resistance can be calculated as P = I ² × R, and the maximum power loss P _max (4.5 W) and the PoE+ IEEE 802.3 at standard supply current I (600 mA) for a pair unit based on a cable length of 200 m The maximum resistance of the composing conductor can be derived as a result of 12.5 Ω.

Therefore, even when a 23AWG conductor is applied, it means that the maximum resistance of the conductor should be 12.5 Ω or less to provide PoE+ function based on 200m.

And, the insulation outer diameter (d) of the conducting wire constituting the pair unit of the PoE cable according to the present invention is preferably 1.0 mm to 1.1 mm in order to secure the flame retardant properties against heat while the outer diameter of the PoE cable is 6.2 mm or less. The range can determine the thickness of the insulator and the material such as LDPE, HDPE or FEP.

As described above, at a distance of 200 meters (m), in order to enable power supply according to the PoE+ IEEE 802.3at standard, it is preferable to configure a long parallel pitch in order to minimize the resistance of the conductor constituting each pair unit.

However, since the cross-connection pitch affects communication characteristics, it is impossible to unconditionally configure the long-duplex pitch of each pair unit 20 constituting the PoE cable 100. Therefore, the PoE cable 100 according to the present invention ), in addition to achieving the purpose of enabling power supply according to the PoE+ IEEE 802.3 at standard up to 200 meters, to satisfy the general Ethernet communication function, as described below, the design of the cable pitch is important.

From this point of view, the PoE cable 100 according to the present invention is designed to have a minimum cross-connection pitch of 12 mm to 15 mm among the cross-connection pitches of a plurality of pair units, and the maximum cross-connection pitch is designed to be at least twice the minimum cross-connection pitch, and the average cross-connection pitch may be configured to be 17 to 22 millimeters (mm) longer than the conventional average of 12 to 15 millimeters (mm). And, after the four pair units are configured to have their respective overlapping pitches, adjacent pair units are They may be assembled to have a collective pitch of 80 mm to 120 mm in a state of being disposed adjacent to or in contact with each other and covered with a cable jacket 30, and the outer diameter of the PoE cable is 6.2 to enable insertion into the cable entry hole of a general-purpose RJ45 plug. The thickness of the cable jacket 30 may be determined to be less than or equal to millimeters (mm).

And, in the present invention, since the PoE cable according to the present invention does not apply a separator or the like between pair units so that it can be connected to a universal RJ45 plug in the present invention, adjacent pair units are placed in contact with each other to minimize the increase in the overall outer diameter of the cable there is.

Here, the meaning that a pair of pair units are adjacent to or in contact does not mean that they always maintain a contact state along the length direction of the cable. It can be understood as meaning that a contact state exists in the region.

Table 1 below shows a comparison table of simple specifications and performance tests of a PoE cable 100 according to an embodiment according to the present invention and two types of PoE cables 100 generally used in the prior art.

The performance test shown in Table 1 below was measured by the test equipment shown in FIGS. 2 and 3 .

2 is a configuration diagram of test equipment (FLUKE DSX-8000, TP cable verifier) for evaluating conductor resistance (R), near-end crosstalk (NEXT) and insertion loss (IL) by connecting to both sides of each 200-meter test cable FIG. 3 shows a system for testing PoE performance through whether the IP camera operates normally with a PoE cable length of 200 m between the network switch and the IP camera.

A PoE cable to be tested was connected to a pair of test equipment shown in FIG. 2 with a predetermined length, and conductor resistance (R), near-end crosstalk (NEXT), and insertion loss (IL) were measured.

And, using the system shown in FIG. 3 , the length of the PoE cable connecting the network switch 300 and the IP camera 400 is 200 meters, and the IP camera is By checking the provided video, it was judged whether the IP CCTV camera was operating normally. Here, the network switch 300 used equipment supporting the PoE+ IEEE 802.3at standard having 8 ports, and transmits power of up to 30W per port according to the PoE+ IEEE 802.3at standard.

In case of IP camera, full HD level (1080p) shooting is possible, and 12V DC product 1080p IR Dome PoE IP Camera was used for the power supply standard. In addition, it is possible to determine whether there is an abnormality in power supply or data communication based on whether an image is normally transmitted through the PC 400 , or whether an image is identified or a time delay occurs.

In Comparative Example 1 of Table 1 below, the diameter of the conductor 11 constituting the wire 10 of the pair unit 20 is 24 AWG, and the separator for separating and spacing the pair unit 20 in the center of the cable is omitted, and the cable The outer diameter is 5.0 millimeters (mm) of the CAT5e standard PoE cable (100).

In Comparative Example 2, the diameter of the conductor 11 constituting the wire 10 of the pair unit 20 is 24 AWG, and a separator for separating and spacing the pair unit 20 in the center of the cable is provided, and the outer diameter of the cable is 5.8 mm (mm) CAT6 standard PoE cable 100.

And, in the embodiment according to the present invention, the diameter of the conductor 11 constituting the wire 10 of the pair unit 20 is 23 AWG, and the separator for separating and spacing the pair unit 20 in the center of the cable is omitted, and the pair The units are arranged adjacent to each other as shown in FIG. 1 , and the outer diameter is a PoE cable 100 of 5.9 millimeters (mm).

conductor
diameter
[AWG] separator cable
outside diameter
[mm] big pitch pitch
[mm] 200m conductor
resistance [Ω] 200m
power consumption
(P=I ² R)
[W] PD transmission
Power [W] PoE CCTV
video transmission test
Comparative Example 1
24
X
5.0 11.0 / 15.0 12.2 / 17.0
18.52
5.60
24.40
fail
Comparative Example 2
24
O
5.8 11.0 / 15.0
12.2 / 17.0
16.76
5.07
24.93
fail
Example
23
X
5.9 12.6 / 22.8;
14.6 / 27.1
12.41
3.75
26.25
pass

Comparative Example 1, Comparative Example 2, and Example each have four pair units 20, and only in the case of Comparative Example 2 of CAT6 grade, a separator for separating and spaced apart each pair unit 20 was provided. In Example 1, Comparative Example 2, and Example, the cable outer diameter satisfies the condition of 6.2 millimeters (mm) or less. Applicable to plugs.

In the case of the embodiment of the present invention, the separator is omitted, but unlike Comparative Examples 1 and 2, a conductor 11 having a larger diameter (23 AWG) is used, and the average cross pitch of the four pair units 20 is larger. .

As described above, the PoE standard can be divided into IEEE 802.3 af PoE 2003 version standard and IEEE 802.3 at PoE+ 2009 version standard for each version, and both version standards are a power receiver (PD) at a distance of 100 meters (m). It requires transmission power of about 13W (maximum transmit power based on PSE of 15.4W) and 25.5W (maximum transmit power of 30W based on PSE) as specifications.

Comparative Example 1 and Comparative Example 2 both satisfy the PD standard transmission power condition of the PoE+ IEEE 802.3 at standard of 100 meters (m), but as described in Table 1 above, 200 meters longer than the PoE+ IEEE 802.3 at standard distance In the test of the PD standard, the received power was measured as 24.4W and 24.93W, so the transmission power condition of 25.5W (the condition of supplying power based on PSE of 30W and power loss of 4.5W or less due to resistance) was not satisfied, but the implementation of the present invention In the example, it was confirmed that the received power based on the PD was measured as 26.25W, which satisfies the transmission power condition of 25.5W.

The embodiment of Table 1 according to the present invention is composed of a 23AWG conductor 11, and the average cross pitch is also longer than 12 to 15 millimeters (mm), which is the range commonly used in the prior art, and the 200-meter conductor resistance is 12.41 (Ω). .

Here, the 200-meter conductor resistance means the greatest resistance among the resistances of the plurality of conductors, and in the embodiment according to the present invention, it can be seen that the conductor resistances of the 8 conductors constituting the 4 pair units are all 12.5 Ω or less.

In addition, as described above, the 200 meter (m) standard PD standard supplied power condition is 25.5 W, the power loss due to the resistance is 4.5 W, and the 200 meter (m) reference conductor resistance 12.5 (Ω is the same standard condition) Therefore, it can be seen that the embodiment of Table 1 also satisfies the IEEE 802.3 at PoE+ standard resistance condition.

In the case of Comparative Examples 1 and 2, 24AWG conductor is applied and the pitch is long, so the resistance is 18.52 ohms (Ω and 16.76 ohms (measured in Ω), respectively, at a distance of 200 meters. At PoE+ standard resistance of 12.5 ohms (It can be seen that the Ω condition cannot be satisfied.

In addition, in the embodiment of the present invention, the 200-meter power receiving device (PD) reference transmission power is measured as 26.25W, which is greater than 25.5W, so even at a distance of 200 meters, the power loss due to the resistance is not relatively large. It can be confirmed that the 802.3 at PoE+ power transmission condition can be satisfied.

4 to 6 show test graphs of insertion loss at 200 meters in Comparative Examples 1, 2, and Examples according to the present invention.

Any signal gets weaker as it travels away from the source, and so does the Ethernet communication signal that flows along a cable. The decrease in signal strength as the distance increases is called insertion loss or attenuation rate. When the PoE cable 100 is connected longer than the design length, it is a representative case in which the insertion loss increases.

In terms of power transmission through the PoE cable 100, it is desirable to design the longest twist pitch in terms of resistance of the conductor 11. However, in consideration of insertion loss and near-end crosstalk, which will be described later, a sophisticated design of the twist pitch is required. do.

In each of the graphs shown in FIGS. 4 to 6 , the magnitude of the insertion loss for each pair of data for each frequency and the loss limit (red line) of the data for each frequency are shown together. In Comparative Example 1 (FIG. 4) and Comparative Example 2 (FIG. 5), insertion loss was measured to be larger than the standard in all frequency domains, and the Example (FIG. 6) according to the present invention is not large but has a slight margin and insertion loss standard It can be confirmed that the .

In terms of insertion loss among communication characteristics, in Comparative Examples 1 and 2, transmission data loss or attenuation was large at a distance of 200 meters, so it was confirmed that normal transmission of CCTV images was impossible. It means you can't be satisfied.

However, in the case of the embodiment according to the present invention, it was confirmed that the normal transmission of the CCTV image was possible even at a distance of 200 m, and by appropriately selecting the diameter of the conductor 11, the resistance was lowered and the insertion loss was reduced at the same time.

7 to 9 are test graphs showing the relationship between the near-end crosstalk (NEXT) and insertion loss for each pair of Comparative Examples 1, 2, and Examples of the present invention.

Near-end crosstalk (NEXT) refers to a transmitted signal excluding noise induced from any one line to an adjacent line. As a measure to check the combination of unnecessary signals that occur between adjacent pairs of communication cables, the smaller the signal combination, the better the performance, and the amount of signal power loss (loss signal power / original signal power) is expressed in dB It means that the larger the signal, the less interference occurs, and the near-end crosstalk (NEXT) dB value decreases as the parallel pitch for each pair unit 20 of the PoE cable 100 is not maintained or as the frequency band of the data signal increases. can be reduced.

Both insertion loss and near-end crosstalk (NEXT) can be assumed to be noise generated when cables or circuits are connected, which is ACR (attenuation-to-crosstalk ratio) ; attenuation-near-end crosstalk ratio). ACR refers to the difference between signal attenuation and near-end crosstalk generated by a conductor or transmission medium. It is a quantitative indicator that indicates how strong the attenuated signal at the receiving end of a communication line is compared to crosstalk. Theoretically, near-end crosstalk and insertion loss are Normal signal transmission is possible up to the intersecting frequency band.

That is, as the length of the PoE cable 100 becomes longer and the data frequency increases, the sum of the insertion loss and the loss occurring in terms of near-end crosstalk is the total channel of the data communication line of the PoE cable 100, and normal communication is not possible due to noise. It can be assumed that an impossible state can be reached.

Therefore, in the near-end crosstalk (NEXT) and insertion loss graphs for each pair of Comparative Example 1, Comparative Example 2, and Example of the present invention shown in FIGS. 7 to 9, Comparative Example 1 is about 121 MHz at 170 meters (m), Comparative Example 2 is about 135 MHz at about 180 meters, and it is confirmed that there is no problem in video signal transmission at 200 meters in the embodiment of the present invention. .

As a result, it can be confirmed that the embodiment according to the present invention does not cause a problem in communication up to frequency bands of about 121 MHz, 135 MHz, and 151 MHz at a length of 200 meters, so the embodiment according to the present invention is 200 meters PoE+ IEEE 802.3 at standard It was confirmed that it can satisfy the communication performance equivalent to or higher than that of the CAT6 class PoE cable 100 that satisfies the power transmission capability of the CAT6 and at the same time satisfies the typical 1Gbps transmission speed.

And, as shown in Table 1, Comparative Example 1 and Comparative Example 1 and comparison when driving a commercial CCTV requiring data and power transmission at a distance of 200 meters with a PoE cable 100 according to Comparative Example 1, Comparative Example 2 and an embodiment of the present invention In Example 2, it is difficult to transmit normal image data and supply driving power, but it was confirmed that the PoE cable 100 according to the embodiment of the present invention can transmit image data and supply driving power even at a distance of 200 meters or more.

In addition, referring to the experimental results of such insertion loss and near-end crosstalk and through examples of various combinations, the PoE cable 100 according to the present invention has a minimum cross-connection pitch of each of the four pair units 20 is 12mm to 15mm, , it was concluded that the maximum cross-connection pitch should be composed of more than twice the minimum cross-connection pitch.

That is, in the case of Comparative Examples 1 and 2, the average cross-winding pitch is configured to be 14 millimeters (mm) or less, but in the present invention, the average cross-connection pitch of the four pair units 20 is 17 mm to 22 mm or more, but the minimum cross-winding Communication characteristics such as insertion loss or near-end crosstalk could be satisfied while the resistance was lowered when the pitch and the maximum crosstalk were designed to have a difference of more than twice.

As such, in the case of the PoE cable according to the present invention, when the above-suggested interplay pitch condition is applied, communication characteristics (1Gbps transmission rate at 200m) are satisfied even without a separator (cross-pillar), etc. It can contribute to minimizing the outer diameter of the cable. can confirm.

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 should be considered to be included in the technical scope of the present invention.

100 : PoE cable
10: lead wire
11: conductor
12: insulating layer
20: pair unit
30: cable jacket

Claims (8)

In a PoE cable that connects a power supply device and a power receiver device and enables data communication and power transmission at the same time,
a plurality of pair units configured by twisting a pair of conductors including a conductor having a diameter of 23AWG and an insulator surrounding the conductor to have a wide pitch; and
Including; an outer jacket surrounding the plurality of pair units;
The plurality of pair units are twisted to have a set pitch,
The minimum cross-connection pitch of the plurality of pair units is 12 mm to 15 mm, and the maximum cross-connection pitch is more than twice the minimum cross-connection pitch,
PoE cable, characterized in that the cable outer diameter is 6.2mm or less. The method of claim 1,
PoE cable, characterized in that the conductor resistance of the wire is 12.5Ω or less based on the cable length of 200mm. The method of claim 1,
A PoE cable, characterized in that the plurality of pair units are in contact with adjacent pair units, respectively. The method of claim 1,
A PoE cable, characterized in that the diameter of the conductor constituting the conducting wire of the pair unit is 0.59 mm to 0.61 mm. 5. The method of claim 4,
PoE cable, characterized in that the outer diameter of the insulation of the wire of the pair unit is 1.0 mm to 1.1 mm. According to claim 1,
A PoE cable, characterized in that the average of the pitch of each of the plurality of pair units is 17 mm to 22 mm. According to claim 1,
A PoE cable, characterized in that the aggregation pitch of the plurality of pair units is 80 mm to 120 mm. The method of claim 1,
PoE cable, characterized in that the power consumption of the PoE cable is 4.5W or less when transmitting power based on the cable length of 200m.

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