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Home Telephone Toll Service and Systems Attenuation Equalizers
 
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Attenuation Equalizers

Communication circuits usually offer greater attenuation at certain frequencies than at others.23,24 This is well illustrated by Fig. 15, which shows the losses offered by a cable circuit.25 Since this circuit was for radio program networks, the distortion would be excessive.

Figure 15. Attenuation-frequency characteristics of line equalizer and 50 miles of 16-gauge, B-22 cable circuit, (Reference 25.)

To compensate for this distortion, an attenuation equalizer1 was inserted in the line. This equalizer had characteristics which are complementary to those of the line, and thus, when the loss in the line and that in the attenuation equalizer are combined, the overall loss is almost the same at all frequencies, as is illustrated by Fig. 15. The total attenuation is greater than that due to the line alone, but this can easily be compensated for by repeaters.


Home Telephone Toll Service and Systems Attenuation Equalizers

Last Update: 2011-05-30