3. Mounting and Wiring
3-5
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.
Table 3-2 Recommended cable specifications
Item
Specifications
Maximum conductor resistance (20°C)
34.0
Ω per km
Withstand voltage
1000 VAC per minute
Minimum insulation resistance (20°C)
2500 M
Ω•km
Capacitance (1 kHz)
60 pF per m
Characteristic impedance (1 MHz)
110
Ω
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.
Содержание 510VE
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