Black Box IC470A - Appendix A: Cable Guidelines

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Appendix A: Cable Guidelines
The Converter operates at frequencies of 20 kHz or less
and has been performance-tested for RS-422/530 using
twisted-pair cable with the following characteristics:
Wire Gauge Capacitance Resistance
19 AWG 83 nF/mi or 15.7 pF/ft. 16.3 mΩ/ft. (53.5 mΩ/m)
(51.6 nF/km or 49.9 pF/m)
22 AWG 83 nF/mi or 15.7 pF/ft. 32.6 mΩ/ft. (107 mΩ/m)
(51.6 nF/km or 49.9 pF/m)
24 AWG 83 nF/mi or 15.7 pF/ft. 51.7 mΩ/ft. (169.5 mΩ/m)
(51.6 nF/km or 49.9 pF/m)
To get optimum performance from the Converter, keep
these guidelines in mind:
• Always use twisted-pair wire—this is not an option.
• Use twisted-pair wire with a capacitance of
20 pF/ft. or less.
• Avoid twisted-pair wire thinner than 26 AWG (that
is, avoid higher AWG numbers than 26).
APPENDIX A: Cable Guidelines