Cable having improved wires arrangement

1. A cable comprising:

a plurality of first wires centrally disposed;

an inner shielding layer enclosing the first wires;

a plurality of second wires disposed at an outer side of the inner shielding layer for transmitting a common power signal; and

a plurality of pairs of differential signal wires disposed at the outer side of the inner shielding layer;

wherein each pair of differential signal wires is disposed between two adjacent second wires; and

wherein each differential signal wire comprises a central conductor, an insulator enclosing the central conductor, a drain wire disposed at an outer side of the insulator, a shielding layer enclosing the drain wire and the insulator, and a tap enclosing the shielding layer.

2. The cable as recited in claim 1 , wherein the drain wire has a diameter less than a diameter of the insulator.

3. The cable as recited in claim 1 , wherein the drain wire contacts and electrically connects with the shielding layer.

4. The cable as recited in claim 1 , wherein there are four pairs of differential signal wires and four second wires.

5. The cable as recited in claim 1 , wherein the first wires comprise a pair of twist wires for transmitting USB 2.0 signal.

6. The cable as recited in claim 5 , wherein the first wires comprise a detection signal wire, a pair of power grounding wires disposed at opposite sides of the detection signal wire, a power wire disposed at a side of the twist wires, and a pair of spare wires.

7. The cable as recited in claim 1 , further comprising a tap layer enclosing the differential signal wires pairs and the second wires, an outer shielding layer enclosing the tap layer, and a jacket enclosing the outer shielding layer.

8. The cable as recited in claim 1 , wherein each of the second wires has a diameter less than a diameter of each of the pair of differential signal wires.

9. A round cable comprising:

a plurality of first wires located at a center thereof and including at least three different type wires;

a plurality of second wires and a plurality of third wire pairs alternately along a periphery of the inner shielding layer in a surrounding manner; wherein

each of the third wire pair includes two differential-pair signal wires while each of the second wires is a power wire, and each of the two differential-pair signal wires is larger than each of the second wires in a cross-sectional view; and

said plurality of first wires are commonly enclosed within an inner shielding layer.

10. The round cable as claimed in claim 9 , wherein each of said two differential-pair signal wires comprises a central conductor, an insulator enclosing the central conductor, a drain wire disposed at an outer side of the insulator, and a shielding layer enclosing the drain wire and the insulator.

11. The round cable as claimed in claim 10 , wherein in each third wire pair, the two central conductors of said two differential-pair signal wires are spaced a first distance from each other while the two drain wires thereof are spaced a second distance greater than the first distance.

12. The round cable as claimed in claim 11 , wherein the drain wire of each differential-pair signal wire is closely adjacent to the drain wire of another differential-pair signal wire of a neighboring third wire pair while the central conductor of said differential-pair signal wire is spaced from the central conductor of said another differential-pair signal wire with a corresponding second wire therebetween.

13. The round cable as claimed in claim 9 , wherein the first wires include a power wire, a grounding wire, a detection wire, and two signal wires.

14. A cable comprising:

a plurality of first wires centrally disposed;

an inner shielding layer enclosing the first wires;

a plurality of second wires disposed at an outer side of the inner shielding layer for transmitting a common power signal; and

a plurality of pairs of differential signal wires disposed at the outer side of the inner shielding layer;

wherein each pair of differential signal wires is disposed between two adjacent second wires;

wherein the first wires comprise a pair of twist wires for transmitting USB 2.0 signal; and

wherein the first wires comprise a detection signal wire, a pair of power grounding wires disposed at opposite sides of the detection signal wire, a power wire disposed at a side of the twist wires, and a pair of spare wires.

15. The cable as recited in claim 14 , wherein the drain wire has a diameter less than a diameter of the insulator.

16. The cable as recited in claim 14 , wherein the drain wire contacts and electrically connects with the shielding layer.

17. The cable as recited in claim 14 , wherein there are four pairs of differential signal wires and four second wires.

18. The cable as recited in claim 14 , further comprising a tap layer enclosing the differential signal wires pairs and the second wires, an outer shielding layer enclosing the tap layer, and a jacket enclosing the outer shielding layer.

19. The cable as recited in claim 14 , wherein each of the second wires has a diameter less than a diameter of each of the pair of differential signal wires.

20. A round cable comprising:

a plurality of first wires located at a center thereof and including at least a power wire, a grounding wire, a signal detection wire and a pair of signal wires; and

a plurality of power wires and a plurality of differential-pair wire pairs alternately along a periphery of the inner shielding layer in a surrounding manner; wherein

each pair of the differential-pair wire pairs includes two differential-pair signal wires, each of the two differential-pair signal wires is larger than each of the second wires in a cross-sectional view; wherein

the first wires are commonly enclosed within an inner shielding layer; wherein

each of said two differential-pair signal wires defines a tumbler configuration with a large bottom portion and a small top portion commonly surrounded within a shield layer in the cross-section view, and the bottom portion includes a central conductor enclosed within an inner insulator, and the top portion includes a drain wire contacting the shield layer.