
In a cable TV system, the trunk line cable that leads from the headend to a distribution point. Or the cable running between a central office and a distribution point. A distribution cable then leads to the individual subscribers.
| Construction | |||
| Material | Diameter (mm) | ||
| Inner Conductor | CCA-Copper clad aluminum | 3.15 | |
| Dielectric | Foam PE | 13.05 | |
| First Shield | Solid aluminum tube + flooded jelly | 13.72 | |
| Jacket | PE | 15.49 | |
| Electrical Characteristics | |||
| Impedance (Ω) | 75 ± 3 | ||
| Capacitance (pF/m) | 52 ± 2 | ||
| Velocity of Propagation (%) | 87.0 | ||
| Return Loss | |||
| 5-1000 MHz (dB) | ≥ 22 | ||
| Screening Effactiveness | |||
| 5-1000 MHz (dB) | ≥ 100 | ||
| Attenuation (@ 20oC) | |||
| Frequency (MHz) |
Max Attenuation (dB/100ft) |
Max Attenuation (dB/100m) |
|
| 5 | 0.14 | 0.46 | |
| 55 | 0.47 | 1.54 | |
| 83 | 0.58 | 1.90 | |
| 211 | 0.95 | 3.12 | |
| 250 | 1.03 | 3.38 | |
| 300 | 1.13 | 3.71 | |
| 350 | 1.23 | 4.04 | |
| 400 | 1.32 | 4.33 | |
| 500 | 1.49 | 4.89 | |
| 600 | 1.64 | 5.38 | |
| 750 | 1.85 | 6.07 | |
| 865 | 2.00 | 6.56 | |
| 1000 | 2.17 | 7.12 | |