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Appendix: Maximum Distances
The maximum distance that a pair of line drivers can communicate across will
vary depending on the data rate and the thickness (gauge) of the wires. In
multipoint applications, it will also vary depending on the number of slaves
on the line. Approximate maximum distances for different combinations of
these factors are listed in the tables below. Please be aware that these numbers
are only approximations; the distances shown might not be attainable for all
applications. Also, maximum distances will always be less than those listed
when line drivers are used in noisy environments.
Table A-1. Approximate range.
Baud Rate 19-AWG 22-AWG 24-AWG 26-AWG
(kbps) (0.8 mm) (0.6 mm) (0.5 mm) (0.4 mm)
km miles km miles km miles km miles
256 3.7 2.3 2.85 1.8 2.25 1.4 1.9 1.2
192 6 3.7 4.5 2.8 3.5 2.2 2.7 1.7
144 10.6 6.6 6.75 4.2 4.5 2.8 3.4 2.1
128 12.4 7.7 7.3 4.5 5 3.1 3.6 2.2
115.2* 12.8 8 7.65 4.8 5.25 3.3 3.8 2.4
112 12.8 8 8 5 5.5 3.4 4 2.5
96 13 8.1 8.3 5.2 6 3.7 4.15 2.6
72 15 9.3 9.4 5.8 6.25 3.9 4.3 2.7
64 17.6 10.9 11 6.8 7.5 4.7 5.3 3.3
57.6* 18.8 11.7 11.75 7.3 8 5 5.6 3.5
56 18.8 11.7 11.75 7.3 8 5 5.6 3.5
48 19.4 12.1 12.2 7.6 8.25 5.1 5.8 3.6
38.4* 20 12.4 12.5 7.8 8.5 5.3 6 3.7
32 20.5 12.7 12.85 8 8.75 5.4 6.2 3.9
28.8* 20.5 12.7 12.85 8 8.75 5.4 6.2 3.9
19.2** 23 14.3 14 8.7 9.75 6.1 7 4.3
*Async baud rate
**Sync/async baud rate
APPENDIX: Maximum Distances