Digital communication cable with linear framework and manufacturing method thereof

Abstract

The invention provides a digital communication cable with a linear framework and a manufacturing method thereof, the digital communication cable comprises the linear framework, two sides of the linear framework are correspondingly provided with a plurality of pairs of wire pairs, the linear framework comprises an aluminum foil, and the outer side of the aluminum foil is coated with a first polyethylene layer; the linear skeleton structure with the aluminum foil is introduced, so that the mechanical strength of the cable is enhanced, and more importantly, the aluminum foil is used as an effective electromagnetic shielding material, so that an electromagnetic field between adjacent wire groups can be effectively isolated, and crosstalk is further reduced; the design not only reduces the crosstalk between the two wire groups which are correspondingly arranged, but also improves the near-end crosstalk effect of the whole cable system through the optimization of the whole structure, and provides more reliable guarantee for data transmission in a high-speed and complex electromagnetic environment.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and in particular to a digital communication cable with an I-shaped skeleton and a manufacturing method thereof. Background Art

[0002] Today, with the rapid development of modern communication technology, the rapid development of high-speed network technology has put forward more stringent requirements on the performance of communication cables, especially in ensuring the integrity of signal transmission, improving transmission rate and maintaining signal stability. With the explosive growth of data traffic and the continuous expansion of communication frequency bands, traditional communication cables are facing unprecedented challenges in complex and changing electromagnetic environments. Among them, crosstalk, especially near-end crosstalk (NEXT), has become a key factor restricting the improvement of signal quality.

[0003] Near-end crosstalk refers to the undesired electromagnetic coupling effect of a signal transmitted on one communication line pair on an adjacent line pair. This interference not only reduces the clarity of signal transmission, but also significantly slows down the data transmission rate and increases the bit error rate during data transmission, ultimately affecting the reliability and efficiency of the entire communication system. In the application scenario of high-speed data transmission, this effect is particularly significant and has become a technical problem that needs to be solved urgently. Traditional cables have the following technical problems:

[0004] The simple cross skeleton structure used in traditional Category 6 digital communication cables also exposes many deficiencies during the manufacturing process. During assembly, the wire pairs are inserted into the skeleton slots in a rotating manner, causing the skeleton to shift easily as the wire pairs rotate. Once the skeleton's ribs deviate from the predetermined position or fold, the core wire may deviate from the original slot, thereby weakening the skeleton's blocking and positioning functions, further exacerbating the crosstalk problem.

[0005] More importantly, the cable production process has extremely high requirements for equipment accuracy and process control. If the production equipment is not accurate enough or the process control is not strict, it is very easy to cause manufacturing defects such as inconsistent wire pair spacing and inaccurate twisted pair pitch. These defects will directly aggravate the mutual interference between wire pairs, further exacerbating the crosstalk problem and affecting the overall quality of communication cables. Summary of the invention

[0006] In order to solve the technical problem of crosstalk existing in existing communication cables when dealing with high-speed data transmission and complex electromagnetic environments, the present invention proposes a digital communication cable with an "I"-shaped skeleton and a manufacturing method thereof, and introduces an "I"-shaped skeleton structure with aluminum foil, which not only enhances the mechanical strength of the cable, but more importantly, the aluminum foil, as an effective electromagnetic shielding material, can effectively isolate the electromagnetic field between adjacent wire groups, further reducing crosstalk; this design not only reduces the crosstalk between two corresponding wire groups, but also improves the near-end crosstalk effect of the entire cable system through the optimization of the overall structure, providing a more reliable guarantee for data transmission in high-speed and complex electromagnetic environments.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows:

[0008] On the one hand, the present invention provides a digital communication cable with an "I"-shaped skeleton, including: an "I"-shaped skeleton, a plurality of pairs of wire groups are arranged correspondingly on both sides of the "I"-shaped skeleton, and the "I"-shaped skeleton includes: aluminum foil, and the outer side of the aluminum foil is coated with a first polyethylene layer.

[0009] The present invention provides a digital communication cable with an "I"-shaped skeleton and a manufacturing method thereof, which introduces an "I"-shaped skeleton structure with aluminum foil, which not only enhances the mechanical strength of the cable, but more importantly, the aluminum foil, as an effective electromagnetic shielding material, can effectively isolate the electromagnetic field between adjacent wire groups, further reducing crosstalk; this design not only reduces the crosstalk between two corresponding wire groups, but also improves the near-end crosstalk effect of the entire cable system through the optimization of the overall structure, providing more reliable protection for data transmission in high-speed and complex electromagnetic environments.

[0010] As a preferred technical solution, each pair of wires includes: at least two insulated single wires, and each two insulated single wires are twisted into a pair of wires at a pitch of 10 to 20 mm.

[0011] As a preferred technical solution, the thickness of the aluminum foil is 0.02-0.04 mm.

[0012] As a preferred technical solution, the density of the first polyethylene layer is ≤0.925 g / cm 3 .

[0013] As a preferred technical solution, the insulated single wire includes: a copper conductor, and a second polyethylene layer is provided on the outer side of the copper conductor.

[0014] As a preferred technical solution, the density of the second polyethylene layer is ≥0.940 g / cm 3 .

[0015] As a preferred technical solution, every 4 pairs of wires and an "I"-shaped skeleton are twisted into a cable core according to a twisting pitch of 80 to 120 mm.

[0016] As a preferred technical solution, an outer sheath is provided outside the cable core.

[0017] As a preferred technical solution, the outer sheath is a PVC sheath or a low-smoke halogen-free sheath, and a tear rope is also provided between the cable core and the outer sheath.

[0018] On the other hand, the present invention provides a method for manufacturing a digital communication cable having an I-shaped skeleton, and preparing a digital communication cable having an I-shaped skeleton as described in any one of the above items, comprising the following steps:

[0019] A first polyethylene layer is extruded on the outside of the aluminum foil to form an "I"-shaped skeleton;

[0020] A second polyethylene layer is extruded on the outside of the copper conductor to form an insulated single wire;

[0021] Every two insulated single wires are twisted into a pair of wires;

[0022] Every two pairs of wire groups are correspondingly arranged on both sides of the "I"-shaped frame, and the wire groups and the "I"-shaped frame are twisted into a cable core;

[0023] A ripcord is placed outside the cable core and an outer sheath is extruded.

[0024] The present invention provides a digital communication cable with an "I"-shaped skeleton and a manufacturing method thereof, which has the following beneficial effects:

[0025] 1) The introduction of the "I"-shaped skeleton structure with aluminum foil not only enhances the mechanical strength of the cable, but more importantly, as an effective electromagnetic shielding material, the aluminum foil can effectively isolate the electromagnetic field between adjacent wire groups and further reduce crosstalk. This design not only reduces the crosstalk between the two corresponding wire groups, but also improves the near-end crosstalk effect of the entire cable system through the optimization of the overall structure, providing a more reliable guarantee for data transmission in high-speed and complex electromagnetic environments.

[0026] 2) The "I"-shaped skeleton provides stable physical support for the cable, helps to maintain the relative position between the wire pairs, reduces the misalignment of the wire pairs caused by cable bending or movement, and thus improves the overall structural stability of the cable; compared with the traditional cross skeleton, the "I"-shaped skeleton may, through its unique structural design, more effectively reduce the electromagnetic coupling effect between the wire pairs, reduce the occurrence of near-end crosstalk (NEXT), and improve the clarity and accuracy of signal transmission; aluminum foil, as a metal shielding layer, can effectively block the intrusion of external electromagnetic interference, while preventing the internal signal of the cable from radiating outward, protecting the integrity and security of signal transmission; this shielding effect is crucial to improving the performance of the cable in a complex electromagnetic environment; the first polyethylene layer wrapped around the outside of the aluminum foil plays a role in protecting the aluminum foil; polyethylene material has good insulation and corrosion resistance, which can prevent the aluminum foil from mechanical damage, chemical corrosion or erosion by environmental factors, thereby extending the service life of the cable; the first polyethylene layer may also work together with the aluminum foil to form a tighter shielding structure, further improving the cable's anti-interference ability and signal transmission quality; at the same time, the presence of the first polyethylene layer also helps to maintain the flexibility and processability of the cable, facilitating installation and maintenance.

[0027] 3) The twisted structure not only reduces crosstalk, but also enhances the overall stability of the line pair;

[0028] By twisting two insulated single wires together at a specific pitch (10-20 mm), the electromagnetic coupling effect between them can be effectively reduced, thereby reducing the occurrence of crosstalk; this twisted structure minimizes the interference of the signal transmitted on one wire pair to the adjacent wire pair, ensuring the clarity and accuracy of signal transmission;

[0029] When the cable is subjected to external forces (such as bending, stretching, etc.), the twisted structure can better maintain the relative position between the wire pairs, reduce signal attenuation or distortion caused by misalignment or deformation of the wire pairs, and thus improve the stability of signal transmission.

[0030] 4) The thickness of the aluminum foil is 0.02-0.04 mm. As a metal shielding layer, the aluminum foil has good conductivity and can effectively block the interference of external electromagnetic waves, while preventing the radiation leakage of the internal signal of the cable, thereby protecting the integrity and stability of signal transmission; this shielding effect is crucial to ensure the accuracy and reliability of high-speed data transmission;

[0031] Aluminum foil with a thickness of 0.02 to 0.04 mm has good flexibility and processability; this allows the aluminum foil to easily adapt to various process requirements in the cable manufacturing process, such as winding, folding or cutting, and also facilitates cable installation and maintenance.

[0032] 5) Low-density polyethylene (LDPE) has good flexibility due to its low density. When the density of the first polyethylene layer is controlled at ≤0.925g / cm 3 It can maintain good softness and bending performance, making the cable more flexible and easy to operate during laying, installation and use;

[0033] The first polyethylene layer is tightly wrapped around the outside of the aluminum foil to protect it. Although the aluminum foil has good electromagnetic shielding properties, it is relatively fragile and susceptible to mechanical damage or chemical corrosion. The low-density polyethylene layer can provide an additional protective layer for the aluminum foil layer to prevent it from being damaged by external factors and resist attenuation.

[0034] 6) A second polyethylene layer is provided on the outside of the conductor. The second polyethylene layer serves as an insulating layer, and its core function is to ensure electrical isolation between the conductor and the external environment. The second polyethylene layer can effectively prevent current from leaking from the conductor to the external environment, and prevent external electrical signals from interfering with signals transmitted in the conductor, thereby ensuring the integrity and accuracy of signal transmission.

[0035] In addition to electrical insulation, the second polyethylene layer also provides a physical protection layer for the conductor; it can resist a certain degree of mechanical impact, abrasion and chemical corrosion, protecting the conductor from damage by the external environment, thereby extending the service life of the cable.

[0036] 7) As the density of polyethylene increases, its mechanical strength usually increases accordingly; therefore, when the density of the second polyethylene layer is ≥ 0.940 g / cm 3 It can better protect the internal conductor, resist external mechanical shock and extrusion, and ensure the stable operation of the cable in harsh environments; high-density polyethylene (HDPE) has better heat resistance and aging resistance than low-density polyethylene (LDPE); when the second polyethylene layer is made of high-density polyethylene material, it can more effectively resist thermal deformation and aging in high temperature environments, thereby extending the service life of the cable.

[0037] 8) The twisted structure can effectively reduce the electromagnetic coupling effect between each pair of wires, thereby reducing crosstalk phenomena such as near-end crosstalk (NEXT) and far-end crosstalk (FEXT); this twisting method reduces the interference of the signal during transmission and improves the clarity and accuracy of signal transmission;

[0038] By twisting multiple pairs of wires and a "one"-shaped skeleton into a cable core according to a specific twisting pitch, a more compact and stable structure can be formed. This structure can better resist the intrusion of external electromagnetic interference and protect the stable transmission of signals inside the cable;

[0039] The selection of the twist pitch (80-120 mm) is based on the balance between the mechanical and electrical properties of the cable. Therefore, the selection of this twist pitch is intended to achieve the best balance between the mechanical flexibility and electrical properties of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic structural diagram of a digital communication cable with an "I"-shaped skeleton provided by the present invention;

[0041] Among them, 1-copper conductor; 2-second polyethylene layer; 3-first polyethylene layer; 4-aluminum foil; 5-tear rope; 6-outer sheath; 7-"I"-shaped skeleton; 8-insulated single wire. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0043] like Figure 1 As shown, the present invention provides a digital communication cable with an "I"-shaped skeleton, including: an "I"-shaped skeleton 7, a plurality of pairs of wire groups are provided on both sides of the "I"-shaped skeleton 7, and the "I"-shaped skeleton 7 includes: an aluminum foil 4, and the outer side of the aluminum foil 4 is coated with a first polyethylene layer 3.

[0044] The present invention provides a digital communication cable with an I-shaped skeleton. The I-shaped skeleton structure with aluminum foil is introduced, which not only enhances the mechanical strength of the cable, but more importantly, the aluminum foil, as an effective electromagnetic shielding material, can effectively isolate the electromagnetic field between adjacent wire groups, thereby further reducing crosstalk. This design not only reduces the crosstalk between two corresponding wire groups, but also improves the near-end crosstalk effect of the entire cable system through the optimization of the overall structure, thereby providing more reliable protection for data transmission in high-speed and complex electromagnetic environments.

[0045] Preferably, the "I"-shaped skeleton 7 provides stable physical support for the cable, helps to maintain the relative position between the wire pairs, and reduces the misalignment of the wire pairs caused by cable bending or movement, thereby improving the overall structural stability of the cable; compared with the traditional cross skeleton, the "I"-shaped skeleton 7 may, through its unique structural design, more effectively reduce the electromagnetic coupling effect between the wire pairs, reduce the occurrence of near-end crosstalk (NEXT), and improve the clarity and accuracy of signal transmission; the aluminum foil 4 serves as a metal shielding layer, which can effectively block the intrusion of external electromagnetic interference, while preventing the internal signal of the cable from radiating outward, thereby protecting the integrity of the signal transmission. and safety; this shielding effect is essential for improving the performance of the cable in a complex electromagnetic environment; the first polyethylene layer 3 coated on the outside of the aluminum foil 4 protects the aluminum foil 4; the first polyethylene layer 3 has good insulation and corrosion resistance, and can prevent the aluminum foil 4 from mechanical damage, chemical corrosion or erosion by environmental factors, thereby extending the service life of the cable; the first polyethylene layer 3 also works together with the aluminum foil 4 to form a tighter shielding structure, further improving the cable's anti-interference ability and signal transmission quality; at the same time, the presence of the first polyethylene layer 3 also helps to maintain the flexibility and processability of the cable, making it easy to install and maintain.

[0046] Preferably, each pair of wires comprises: at least two insulating single wires 8, and every two insulating single wires 8 are twisted into a pair of wires at a pitch of 10 to 20 mm.

[0047] Preferably, the twisted structure not only reduces crosstalk, but also enhances the overall stability of the line pair;

[0048] Preferably, the pitch of twisting the two insulated single wires 8 together is preferably 10mm, 15mm and 120mm. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range; by twisting the two insulated single wires 8 together at a specific pitch (10-20mm), the electromagnetic coupling effect between them can be effectively reduced, thereby reducing the occurrence of crosstalk; this twisted structure minimizes the interference of the signal transmitted on one wire pair to the adjacent wire pair, thereby ensuring the clarity and accuracy of signal transmission.

[0049] Preferably, when the cable is subjected to external forces (such as bending, stretching, etc.), the twisted structure can better maintain the relative position between the wire pairs, reduce signal attenuation or distortion caused by misalignment or deformation of the wire pairs, and thus improve the stability of signal transmission.

[0050] Preferably, the thickness of the aluminum foil 4 is 0.02-0.04 mm; the thickness of the aluminum foil 4 is preferably 0.02 mm, 0.03 mm and 0.04 mm. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the range. The aluminum foil 4, as a metal shielding layer, has good electrical conductivity and can effectively block the interference of external electromagnetic waves, while preventing the radiation leakage of the internal signal of the cable, thereby protecting the integrity and stability of signal transmission; this shielding effect is crucial to ensure the accuracy and reliability of high-speed data transmission;

[0051] Preferably, the aluminum foil 4 with a thickness of preferably 0.02 to 0.04 mm has good flexibility and processability; this enables the aluminum foil 4 to easily adapt to various process requirements in the cable manufacturing process, such as winding, folding or cutting, and also facilitates the installation and maintenance of the cable.

[0052] Preferably, the density of the first polyethylene layer 3 is ≤0.925 g / cm 3 ; Low-density polyethylene (LDPE) has good flexibility due to its low density; when the density of the first polyethylene layer 3 is controlled at ≤0.925g / cm 3 It can maintain good softness and bending performance, making the cable more flexible and easy to operate during laying, installation and use;

[0053] Preferably, the first polyethylene layer 3 is tightly wrapped around the outside of the aluminum foil to protect the aluminum foil 4; although the aluminum foil 4 has good electromagnetic shielding performance, it is relatively fragile and easily susceptible to mechanical damage or chemical corrosion; the low-density first polyethylene layer 3 can provide an additional protective layer for the aluminum foil 4 to prevent it from being damaged by external factors and resist attenuation.

[0054] Preferably, the insulated single wire 8 comprises: a copper conductor 1 , and a second polyethylene layer 2 is provided on the outer side of the copper conductor 1 .

[0055] Preferably, a second polyethylene layer 2 is provided on the outside of the copper conductor 1. The second polyethylene layer 2 serves as an insulating layer, and its core function is to ensure electrical isolation between the conductor and the external environment. The second polyethylene layer 2 can effectively prevent current from leaking from the copper conductor 1 to the external environment, and prevent external electrical signals from interfering with signals transmitted in the copper conductor 1, thereby ensuring the integrity and accuracy of signal transmission.

[0056] Preferably, in addition to electrical insulation, the second polyethylene layer 2 also provides a physical protection layer for the copper conductor 1; it can resist a certain degree of mechanical impact, wear and chemical corrosion, protect the copper conductor 1 from damage by the external environment, and thus extend the service life of the cable.

[0057] Preferably, the density of the second polyethylene layer 2 is ≥ 0.940 g / cm 3 ; As the density of polyethylene increases, its mechanical strength usually increases accordingly; therefore, when the density of the second polyethylene layer 2 is ≥ 0.940 g / cm 3 It can better protect the internal copper conductor 1, resist external mechanical impact and extrusion, and ensure the stable operation of the cable in harsh environments; high-density polyethylene (HDPE) has better heat resistance and aging resistance than low-density polyethylene (LDPE); when the second polyethylene layer 2 is made of high-density polyethylene material, it can more effectively resist thermal deformation and aging in high temperature environments, thereby extending the service life of the cable.

[0058] Preferably, every four pairs of wires and the "I"-shaped skeleton 7 are twisted into a cable core at a twisting pitch of 80 to 120 mm.

[0059] The twisted structure can effectively reduce the electromagnetic coupling effect between pairs of wires, thereby reducing crosstalk phenomena such as near-end crosstalk (NEXT) and far-end crosstalk (FEXT). This twisting method reduces interference to the signal during transmission, improving the clarity and accuracy of signal transmission.

[0060] By twisting multiple pairs of wires and the "I"-shaped skeleton 7 into a cable core according to a specific twisting pitch, a more compact and stable structure can be formed; this structure can better resist the intrusion of external electromagnetic interference and protect the stable transmission of the signal inside the cable;

[0061] The twisting pitch of each 4 pairs of wires and the "I"-shaped skeleton 7 twisted into a cable core is preferably 80㎜, 90㎜, 100㎜, 110㎜ and 120㎜. Due to space limitations and for the sake of simplicity, the present invention no longer exhaustively lists the specific point values ​​included in the said range. Therefore, the selection of this twisting pitch is intended to achieve the best balance between the mechanical flexibility and electrical performance of the cable based on the balance between the mechanical properties and electrical properties of the cable.

[0062] Preferably, an outer sheath 6 is provided outside the cable core, and the outer sheath 6 is a PVC sheath or a low-smoke halogen-free sheath.

[0063] Preferably, a tear cord 5 is provided between the cable core and the outer sheath 6, and the tear cord 5 plays many roles in the cable, such as facilitating construction and maintenance, enhancing the mechanical properties of the cable, protecting the internal structure of the cable, and improving the fire resistance and flame retardancy of the cable. These roles jointly ensure the safety, stability and reliability of the cable during use.

[0064] The present invention provides a method for manufacturing a digital communication cable with a straight-line skeleton, and the method comprises the following steps:

[0065] A first polyethylene layer 3 is extruded on the outside of the aluminum foil 4 to form an "I"-shaped skeleton 7;

[0066] A second polyethylene layer 2 is extruded outside the copper conductor 1 to form an insulated single wire 8;

[0067] Every two insulated single wires 8 are twisted into a pair of wires;

[0068] Every two pairs of wire groups are correspondingly arranged on both sides of the "I"-shaped frame 7, and the wire groups and the "I"-shaped frame 7 are twisted into a cable core;

[0069] A tear cord 5 is placed outside the cable core, and then an outer sheath 6 is extruded.

[0070] The present invention provides a method for manufacturing a digital communication cable with an "I"-shaped skeleton. The "I"-shaped skeleton structure with aluminum foil is introduced, which not only enhances the mechanical strength of the cable, but more importantly, the aluminum foil, as an effective electromagnetic shielding material, can effectively isolate the electromagnetic field between adjacent wire groups, thereby further reducing crosstalk. This design not only reduces the crosstalk between two corresponding wire groups, but also improves the near-end crosstalk effect of the entire cable system through the optimization of the overall structure, thereby providing a more reliable guarantee for data transmission in high-speed and complex electromagnetic environments.

[0071] The present invention provides a method for manufacturing a digital communication cable with an I-shaped skeleton. Eight copper conductors 1 are respectively extruded with a layer of high-density polyethylene to form a second polyethylene layer 2 of eight colors, namely, blue, white-blue, orange, white-orange, green, white-green, brown, and white-brown, to form an insulating single wire 8; every two insulating single wires 8 (blue and white-blue; orange and white-orange; green and white-green; brown and white-brown) are twisted into a pair of wires at a pitch of 10 to 20 mm; the I-shaped skeleton 7 is composed of a layer of aluminum foil 4 and a first polyethylene layer 3; the pair of wires are correspondingly arranged on both sides of the I-shaped skeleton 7, and every four pairs of pair of wires and the I-shaped skeleton 7 are twisted into a cable core at a twisting pitch of 80 to 120 mm; the I-shaped skeleton 7 evenly separates two pairs of pair of wires; a tear rope 5 is placed outside the cable core, and then an outer sheath 6 is extruded.

[0072] By twisting at different pitches, crosstalk can be effectively reduced, and the "I"-shaped skeleton 7 can effectively isolate the two line groups, reducing the crosstalk between the corresponding line groups, thereby increasing the overall near-end crosstalk effect.

[0073] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all various changes or equivalent substitutions falling within the scope of the claims of the present application are included. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope protected by the present invention.

Claims

1. A digital communication cable with a "I"-shaped skeleton, characterized in that: include: An "I"-shaped frame, wherein a plurality of pairs of wire groups are arranged correspondingly on both sides of the "I"-shaped frame, and the "I"-shaped frame comprises: an aluminum foil, and a first polyethylene layer is coated on the outer side of the aluminum foil.

2. The digital communication cable with a "I"-shaped skeleton according to claim 1 is characterized in that: Each pair of wires includes: at least two insulated single wires, and each two insulated single wires are twisted into a pair of wires at a pitch of 10 to 20 mm.

3. The digital communication cable with a "I"-shaped skeleton according to claim 1 is characterized in that: The thickness of the aluminum foil is 0.02-0.04 mm.

4. The digital communication cable with a straight-line skeleton according to claim 1, characterized in that: The density of the first polyethylene layer is ≤0.925 g / cm 3 .

5. The digital communication cable with a "I"-shaped skeleton according to claim 2 is characterized in that: The insulated single wire comprises: a copper conductor, and a second polyethylene layer is arranged on the outer side of the copper conductor.

6. The digital communication cable with a straight-line skeleton according to claim 5, characterized in that: The density of the second polyethylene layer is ≥0.940 g / cm 3 .

7. The digital communication cable with a straight-line skeleton according to claim 1 or 2, characterized in that: Every 4 pairs of wires and the "I"-shaped skeleton are twisted into a cable core with a twisting pitch of 80 to 120 mm.

8. The digital communication cable with a straight-line skeleton according to claim 7, characterized in that: An outer protective layer is arranged outside the cable core.

9. The digital communication cable with a straight-line skeleton according to claim 8, characterized in that: The outer sheath is a PVC sheath or a low-smoke halogen-free sheath, and a tear rope is provided between the cable core and the outer sheath.

10. A method for manufacturing a digital communication cable having a "I"-shaped skeleton, characterized in that: The digital communication cable having a straight-line skeleton as claimed in any one of claims 1 to 9 is prepared, comprising the following steps: A first polyethylene layer is extruded on the outside of the aluminum foil to form an "I"-shaped skeleton; A second polyethylene layer is extruded on the outside of the copper conductor to form an insulated single wire; Every two insulated single wires are twisted into a pair of wires; Every two pairs of wire groups are correspondingly arranged on both sides of the "I"-shaped frame, and the wire groups and the "I"-shaped frame are twisted into a cable core; A ripcord is placed outside the cable core and an outer sheath is extruded.

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