CN213844869U

CN213844869U - High-performance communication cable with crosstalk barrier

Info

Publication number: CN213844869U
Application number: CN202021925907.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Shenyang Antong Cable Co ltd
Current assignee: Shenyang Antong Cable Co ltd
Priority date: 2020-09-07
Filing date: 2020-09-07
Publication date: 2021-07-30
Anticipated expiration: 2030-09-07

Abstract

The utility model discloses a high performance communication cable with crosstalk protective screen is to constituteing by a plurality of conductors. Each conductor pair comprises two metal conductors, each conductor being surrounded by an insulator. The intermediate polymer jacket has an inner surface and an outer surface, the entire inner surface of which surrounds the plurality of conductor pairs. The outer polymer jacket also has an inner surface and an outer surface, the entire inner surface of which surrounds the outer surface of the intermediate polymer jacket. The outer surface of the intermediate polymer jacket is adhered to the inner surface of the outer polymer jacket.

Description

High-performance communication cable with crosstalk barrier

Technical Field

The utility model relates to a communication cable field, concretely relates to high performance communication cable with crosstalk protective screen.

Background

There is a need to improve the performance of communication cables to increase the networking speed of computers and other digital electronic devices that need to communicate via fast data transmission. Metal core based communication cables, particularly of the "conductor pair" type, enable digital electronic devices to transmit/receive data via electrical signals transmitted at various transmission frequencies.

Communication cables should achieve high performance on the basis of meeting industry standard requirements (including requirements in terms of impedance, attenuation, size limitations, etc.): while maintaining a high transmission frequency and integrity of the transmitted data.

For communication cables that can meet relevant industry standards and operate at high transmission frequencies, consideration is also given to reducing factors such as the degree of crosstalk. Crosstalk is an important factor in evaluating the performance of data cables. Crosstalk is the loss or dissipation of signal energy resulting from coupling between cable conductors or components. In addition, crosstalk coupling within a cable is also related to the dielectric constant of the materials used in the cable.

Communication cables containing multiple sets of conductor pairs (also referred to as "twisted wire pairs") have crosstalk problems between different pairs of conductors. As the transmission frequency increases, the crosstalk problem is also severe. In this case, the cable available at the lower transmission frequency is no longer suitable.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high performance communication cable with crosstalk protective screen to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the utility model discloses a high-performance communication cable with crosstalk barrier, which comprises a plurality of conductor pairs, wherein each conductor pair comprises two metal conductors, and each conductor is respectively surrounded by an insulator; an intermediate polymer jacket having an inner surface and an outer surface, the entire inner surface of which surrounds the plurality of conductor pairs; an outer polymeric sheath also having an inner surface and an outer surface, the entire inner surface of the outer polymeric sheath surrounding the outer surface of the intermediate polymeric sheath; the outer surface of the intermediate polymer jacket is adhered to the inner surface of the outer polymer jacket.

The present invention reduces crosstalk between pairs of conductors, provides a crosstalk barrier and characteristic impedance for data transmission, and can therefore be used to transmit data through a conductor (e.g., copper wire) at higher frequencies (within the range of 1-500 MHz).

Drawings

Fig. 1 is a cross-section of a communication cable used in an embodiment of the present invention.

Reference numerals: a communication cable (1); an outer jacket (2), a pair of conductors (3); a component (4, 5); conductor cables (6, 7); a stripping cord (8); an intermediate sheath (9).

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

Figure 1 shows an embodiment of the present invention. As shown in fig. 1, a communication cable 1 includes an outer jacket 2 made of polyvinyl chloride (PVC), a pair of conductors 3, a member 4 made of three pairs of conductors, and a member 5 made of four pairs of conductors.

In the embodiment shown, the strapping ties bind the components 4 and 5 into a set of conductor pairs 3. The conductor pair 3 consists of a single twisted pair of

conductor cables

6 and 7. The

conductor cables

6 and 7 are each provided with a solid polyethylene insulation or other form of insulation.

The communication cable 1 is equipped with a ripcord 8, thereby facilitating installation. The outer jacket 2 is made of a flame retardant material or a low smoke PVC material. Furthermore, an additional sheath (not shown) arranged around the outer sheath 2 is suitable for outdoor or indoor use without reducing or changing the electrical parameters of the cable 1. The additional sheath is made of low density polyethylene, termite resistant nylon, PVC, etc.

The communication cable 1 is provided with an intermediate sheath 9. A band-shaped intermediate sheath 9 is helically wound around the components 4 and 5.

The outer sheath 2 is extruded onto the intermediate sheath 9, causing the intermediate sheath 9 to partially melt. When the cable 1 cools, the intermediate sheath 9 will adhere firmly to the outer sheath 2.

Thus, the melt temperature of the material forming the outer sheath 2 should be high enough to cause partial melting of the intermediate sheath 9. It is not preferable in view of the fact that the intermediate sheath 9 is completely melted. Giving the cable 1 mechanical protection.

The conditions of the extrusion zone are therefore selected to create the desired environment to produce the desired intermediate sheath-outer sheath interface. The temperature is important throughout the extrusion process, but most critical is the melt temperature corresponding to the extruder die, i.e., where the melt contacts the intermediate sheath.

In a suitable temperature range, the intermediate sheath 9 will partially melt and adhere firmly to the outer sheath 2. Thereby forming a mechanical contact between the intermediate sheath 9 and the outer sheath 2, reducing crosstalk between the conductor pairs. The interface layer between the intermediate sheath 9 and the outer sheath 2 is referred to herein as the intermediate layer interface.

The bond between the intermediate jacket 9 and the outer jacket 2 provides a crosstalk barrier and characteristic impedance stabilization for data transmitted along the

conductor cables

6 and 7 in the cable 1. The cable can therefore be used as a communications cable for data that must be transmitted at higher frequencies (in the range of 1-500 MHz) using conductors such as copper wire.

The adhesion of the intermediate sheath 9 to the outer sheath 2 can reduce capacitive coupling between certain portions of the cable 1, for example, between the conductor pair 3 and the outer sheath 2, between the conductor pair members 4 or 5, or between the conductor pair members 4 or 5 and the outer sheath 2. It should be noted that placing the intermediate jacket material at various locations within the cable 1 can reduce crosstalk.

The intermediate sheath 9 is made of a foam material. From a mechanical point of view, the foam does not change the insulation dimensions of the cable 1 during installation of the cable or during rewinding of the cable.

The temperature profile during extrusion is critical to the interface of the intermediate layer required for successful fabrication of a high speed network. When the interlayer interface is successfully formed, it helps to achieve a higher crosstalk ratio between the paired conductors, and a stable input impedance and return loss over a particular cable operating frequency range.

The temperature of the extruded area of the cable 1 should vary within 4 c, preferably within 2 c, to ensure that the intermediate sheath 9 does not melt completely, forming a suitable intermediate layer interface.

The foamed polypropylene tape has a more suitable dielectric constant than a general polypropylene tape or a polyethylene tape, and thus is a preferred material for the intermediate sheath 9.

Claims

1. A high performance communication cable with crosstalk barriers, comprising: the cable comprises a plurality of conductor pairs (3), each conductor pair comprising two metallic conductors and each conductor being surrounded by an insulator; an intermediate polymer jacket (9) having an inner surface and an outer surface, the entire inner surface of which surrounds the plurality of conductor pairs; an outer polymer jacket (2) also having an inner surface and an outer surface, the entire inner surface of which surrounds the outer surface of the intermediate polymer jacket; the outer surface of the intermediate polymer jacket is adhered to the inner surface of the outer polymer jacket.

2. The high performance communication cable with crosstalk barrier of claim 1, wherein: the intermediate polymer jacket (9) is a polymer tape wrapped over the plurality of conductor pairs, the intermediate polymer jacket (9) being thermally adhered to the outer polymer jacket (2).

3. The high performance communication cable with crosstalk barrier of claim 1, wherein: the outer polymer jacket (2) is made of a flame retardant material or a low smoke PVC material.