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3.4.2 Cable specifications
The J.NET module requires two pairs of shielded twisted-pair cables.
We recommend polyethylene-insulated vinyl sheath cables that meet the specifications shown in Table 3-2.
Note: The preceding table shows a characteristic impedance of 110Ω at 1 MHz. However, the J.NET module
has 120Ω internal terminating resistors in consideration of other transmission rates.
Table 3-2 Recommended cable specifications
Item
Maximum conductor resistance (20°C)
Withstand voltage
Minimum insulation resistance (20°C)
Capacitance (1 kHz)
Characteristic impedance (1 MHz)
Specifications
34.0Ω per km
1000 VAC per minute
2500 MΩ•km
60 pF per m
110Ω
3-5
3. Mounting and Wiring
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