Section 2 Transmission Media and Components
Thick Cable
9ARD000015-600
23
Electrical
Environmental
Table 5. Physical Characteristics of Data Pair Specification for Thick Cables
Physical Characteristics
Specification
Conductor pair
S
ize #18 Copper (minimum); 19 strands
minimum (individually tinned)
Insulation diameter
0.150 inches (nominal)
Colors Light
Blue
White
Pair Twist/ft
3 (approximately)
Tape shield over pair
2 mil / 1 mil, Al / Mylar
Al side out w/shorting fold (pull-on
applied)
Table 6. Electrical Characteristics of Data Pair Specification for Thick Cables
Electrical Characteristics
Specification
Impedance
120 Ohms +/- 10% (at 1 MHz)
Propagation delay
1.36 nSec/ft (maximum)
Capacitance between conductors 12 pF/ ft at 1 kHz (nominal)
Capacitive unbalance
1200 pF/1000 ft at 1 kHz (nominal)
Table 4. Specifications for Thick Cable and their Corresponding Table Numbers (Continued)
Characteristics
Table Number