Specifications

RS-422/485 Application Note 21
 Copyright B&B Electronics -- Revised October 1997
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
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Losses in a transmission line are a combination of AC losses (skin effect),
DC conductor loss, leakage, and AC losses in the dielectric. In high quality
cable, the conductor losses and the dielectric losses are on the same order of
magnitude. Figure 3.2 is included in this application note to point out the
significant difference in performance of different cables. This chart shows
Attenuation versus Frequency for three different Belden cables. Note that the
polyethylene cables offer much lower attenuation than PVC cables.
Figure 3.1