Cable structure

A cable structure includes a tubular body, a main spacer, a first spacer, a first protector, a second protector and a plurality of twisted pairs. The tubular body is disposed in the tubular body. The first spacer is substantially perpendicularly connected to the main spacer in a central position. The first protector and the second protector are disposed at two ends of the main spacer. A first channel is formed by the main spacer, the first protector and the second protector, a second channel is formed by the main spacer, the first protector and the first spacer, and a third channel is formed by the main spacer, the second protector and the first spacer. The twisted pairs are disposed in the first channel, the second channel and the third channel.

BACKGROUND OF THE INVENTION

Field of the Invention

The invention relates to a cable, and more particularly to cable having an anti-crosstalk structure.

Description of the Related Art

In a network system, a network cable is used for signal transmission to a device connected to the network system. The more network develops, the transmission speed of signals via the network cable is also required to be faster. Therefore, the current network construction environment tends to be densely arranged, and the network cable that is laid out will also tend to have a tight structure.

Since electromagnetic waves are emitted from the core wires of each network cable when signals are transmitted in the network cable, it is needed to isolate or reduce the electromagnetic waves emitted by other core wires to improve the transmission efficiency in the network cable without affecting the signal transmitted therein.

In order to solve this problem, the prior art, such as the U.S. Pat. No. 7,772,494, discloses a structure of an isolation bracket, which is formed by combining two H-shaped brackets in a misalignment manner and forming four isolation channels. Each of the four twisted pairs in a network cable are respectively received in an isolation channel, and the spacers are used to reduce the mutual interference between the four pairs of twisted pairs. Two bumps are additionally disposed on the two spacers on the outer side of the H-shaped bracket. When the plurality of network cables are close to each other, the two adjacent network cables can be separated by the bumps. Although the bracket can effectively block four Crosstalk interference between twisted pairs, and can also effectively prevent crosstalk interference with external network cables, it also produces reduction of the complementary effect between the complementary twisted pairs due to the isolation structure. At the same time, it costs more for the cross-shaped isolation bracket which is a more conventional art.

In addition, a conventional T-shaped isolation bracket is disclosed in the prior art, such as Japan patent publication No. P2004-311120A. The T-shaped structure is divided into three core channels, and two of the four twisted pairs of network cables are received in one of the channels, and the other two twisted pairs are received in the rest two channels respectively. Similarly, a conventional technique such as U.S. Pat. No. 7,897,875 discloses a T-isolated bracket based on the contents of the aforementioned Japan patent. It is further disclosed that the twisted pair having the second longest pitch and the twisted pair having the shortest pitch are received in the same channel, and the twisted pair having the longest pitch and the twisted pair having the second shortest pitch are received in the rest two channels respectively. Although the aforementioned T-shaped bracket further has no separation for the complementary twisted pairs, so that the signals in the complementary twisted pairs can complement each other, and can also isolate the crosstalk of the remaining twisted pairs, such a structure cannot effectively avoid the crosstalk interference caused by the external network cable, which is the shortcoming of this technology.

BRIEF SUMMARY OF THE INVENTION

In view of the above-mentioned shortcomings, an object of the present invention is to provide a cable structure with an isolation bracket, which is arranged by internal spacers and protectors to prevent crosstalk interference with adjacent cable. It effectively enhances the ability of external crosstalk, and at the same time, the plurality of core wires of the twisted pairs disposed in the same channel also complement each other.

The invention provides a cable. The cable in accordance with an exemplary embodiment of the invention includes a tubular body, a main spacer, a first spacer, a first protector, a second protector and a plurality of twisted pairs. The tubular body is disposed in the tubular body. The first spacer is disposed in the tubular body and substantially perpendicularly connected to the main spacer at a central position. The first protector is disposed at an end of the main spacer and connected to the main spacer at an angle. The second protector is disposed at another end of the main spacer and connected to the main spacer at an angle, wherein a first channel is formed by the main spacer, the first protector and the second protector, a second channel is formed by the main spacer, the first protector and the first spacer, and a third channel is formed by the main spacer, the second protector and the first spacer. The twisted pairs are disposed in the first channel, the second channel and the third channel, wherein an even number of the twisted pairs are received in the first channel, one of the twisted pairs is received in the second channel and another one of the twisted pairs is received in the third channel.

The first protector and the second protector can respectively fix the twisted pairs to the first channel, the second channel and the third channel. The first protector and the second protector can respectively prevent the crosstalk caused by the adjacent cable. The main spacer and the first spacer are arranged to isolate the interference caused by the twisted pair disposed on the first channel, the second channel and the third channel respectively. The plurality of core wires disposed in the twisted pairs of the same channel have complementary effect respectively.

DETAILED DESCRIPTION OF THE INVENTION

Referring toFIG. 1, which is a cross-sectional view of the first embodiment of a cable of the present invention. As shown inFIG. 1, the cable structure of the present invention includes a tubular body1in which a main spacer2is disposed. The main spacer1is horizontally located therein, and a first spacer3is connected to the main spacer2at a central position of the main spacer1in the embodiment. The first spacer3is connected to the main spacer2in a vertical manner, and the first spacer3and the main spacer2are integrally formed. Two ends of the main spacer2are respectively connected to a first protector21and a second protector22. The first protector21and the second protector22are respectively connected to the main spacer2at an angle. The first protector21and the second protector22are parallel to each other. In the embodiment, the first protector21is disposed under the main spacer2. The first protector21has a curved outer peripheral surface which is located lower than the main spacer2, and the second protector22has an outer surface with a triangular cross section which is disposed higher the main spacer2.

Referring to theFIG. 1again, the main spacer2, the first protector21and the second protector22form a first channel23, and the main spacer2, the first protector21and the first spacer3forms a second channel24, and the main spacer2, the second protector22and the first spacer3form a third channel25. The cable structure of the present invention includes a plurality of twisted pairs4, each of the twisted pairs4includes an insulating material41and a core wire42enclosed by the insulating material41. The first channel23is provided with an even number of twisted pairs4, and the second channel24is provided with a single twisted pair4, and the third channel25is provided another single twisted pair4. The first protector21and the second protector22extend above a top of the main spacer2a first distance that is greater than a diameter of the plurality of twisted pairs4, respectively. The first protector21and the second protector22extend below a bottom of the main spacer2a second distance that is greater than the diameter of the plurality of twisted pairs4, respectively.

The first protector21and the second protector22respectively fix the twisted pairs4to the first channel23, the second channel24, and the third channel25, respectively. When a plurality of the cable structure of the present invention are juxtaposed, the first protector21and the second protector22can block crosstalk interference caused by adjacent cables, thereby effectively improving the ability of external crosstalk, and at the same time, the main spacer2and the first spacer3further isolate the interference generated by the twisted pairs4respectively disposed in the first channel23, the second channel24, and the third channel25, and signals in a plurality of core wires42of the twisted wires4disposed in the same channel respectively can complement each other.

A plurality of protrusions11are disposed on an inner surface of the tubular body and equally-spaced thereon. The protrusions11can enhance the prevention of the crosstalk between the adjacent cables.

Referring to theFIG. 2, which is a perspective view of a second embodiment of a cable structure of the present invention. As shown inFIG. 2, a first twisted pair4aand a second twisted pair4bare disposed in parallel in the first channel23, a third twisted pair4cis disposed in the second channel24and a fourth twisted pair4dis disposed in the third channel, wherein the first twisted pair4ahas the longest pitch and the second twisted pair4bhave the shortest pitch respectively. As shown inFIG. 3, the pitch of a twisted pair4ais a, and the pitch of the second twisted pair4bis b. As shown inFIG. 4, the pitch of the third twisted pair4cis c, and the pitch of the fourth twisted pair4dis d. The value of the pitches of the twisted pairs has a correlation of b>d>c>a. The twisted pair4ahaving the shortest pitch and the second twisted pair4bhaving the longest pitch are adjacent to each other in the first channel23without spacing therebetween, so that the first twisted pair4aand the second twisted pair4bare signal complementary. The third twisted pair4chaving the second shortest pitch in the second channel24is separated from the second twisted pair4bhaving the longest pitch by the main spacer2, and away from the first twisted pair4ahaving the shortest pitch, which can improve the complementary effect with the twisted pair having the longest pitch and reduce the interference with the twisted pair having the shortest pitch. Similarly, the fourth twisted pair4dhaving the second longest pitch in the third channel25can improve the complementary effect with the twisted pair having the shortest pitch and reduce the interference with the fourth twisted pair4dhaving the longest pitch.

In addition, as shown inFIG. 5, a combination of six cables surrounding one cable can simulate an environments on the site of a computer facility where several cables are joined. The central cable can prevent the electromagnetic interference caused by the externally surrounded cables through the first protector21and the second protector22. In addition, further, the first protector has a curved shape and, and the second protector22has a triangular shape. The tip portion of the first protector21and the second protector22can match the shape of the tubular body1of the cable so as to cover a part of the twisted pairs therein to provide a more complete protection. The bottom portion of the first protector21and the second protector22opposite to the tip portion increases the distance between the twisted pairs and the external cable, thereby reducing the crosstalk therebetween. Further, the inner surface of the tubular body1is provided with a plurality of protrusions11equally spaced thereon. The protrusions11can maintain the twisted pairs4and the isolation bracket at a central region of the cable, thereby increasing the distance between twisted pair4and the other cables to reduce crosstalk.

Referring toFIG. 6, in this embodiment, the first protector21has curved outer walls either higher or lower than the main spacer2.