Communication cable of high capacity
In communication cable of high capacity according to present invention, conductor of diameter d is coated by insulation material to form wire of diameter D, plural number of said wire are twisted by pitch p to form pairs, plural number of said pairs are twisted by collective pitch P, and said communication cable of high capacity comprise sheath wrapping said pairs, and the diameter d of said conductor and diameter D of said wire and pitch p and collective pitch P and impedance of said wires are defined by function of compensation coefficient A (81<A<83) by dielectric constant of insulation member and magnetic permeability of conductor, compensation coefficient B (0.005<B<0.007) by pitch (p) and collective pitch (P). And, by impedance matching between impedance of wire and impedance of equipment for data transmission, return loss of cable can be minimized, so high speed data transmission can be made.
1. In communication cable of high capacity, conductor of diameter d is coated by insulation material to form wire of diameter D,
plural number of wires are twisted by pitch p to form pairs,
plural number of said pairs are twisted by collective pitch P,
wherein, said communication cable of high capacity comprise sheath wrapping said pairs,
and the relationship among diameter (d) of said conductor and diameter (D) of said wire and pitch (p) and collective pitch (P) and impedance of said wires is,
Z
=
A
×
ln
[
(
D
d
+
(
D
d
)
2
-
1
)
×
(
1
+
B
×
P
×
p
P
+
p
)
]
A: compensation coefficient by dielectric constant of insulation member and magnetic permeability of conductor (81≦A≦83).
B: compensation coefficient by pitch (p) and collective pitch (P) (0.005≦B≦0.007).
2. Communication cable of high capacity according to claim 1 , wherein, the impedance (Z) of said wire is from 90 to 110, and D/d is from 1.625 to 1.835.
3. Communication cable of high capacity according to claim 1 or 2 , wherein,
the relationship between pitch (p) of said plural pairs and diameter (D) of said wire is,
if p 1 is larger than p 2 (p 1 >p 2 ), then D 2 is larger than D 1 (D 1 <D 2 ).
4. Communication cable of high capacity according to claim 3 , wherein, pitches (p) of said plural pairs are different from one another.
5. Communication cable of high capacity according to claim 1 , wherein, diameter (d) of said conductor is from 0.53 mm to 0.65 mm.
6. Communication cable of high capacity according to claim 1 , wherein, pitches (p) of said pairs are from 8 mm to 25 mm.
7. Communication cable of high capacity according to claim 1 , wherein, said collective pitch (P) is from 40 mm to 150 mm.
8. Communication cable of high capacity according to claim 1 , wherein, diameter (D) of said wire is from 0.9 mm to 1.1 mm.
9. Communication cable of high capacity according to claim 1 , wherein, said communication cable further comprises separator for separating said plural pairs.
10. Communication cable of high capacity according to claim 9 , wherein, said separator has cross shape of cross section.