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A polarential telegraph system is a direct … A polarential telegraph system is a direct-current telegraph system employing polar transmission in one direction and a form of in the other. Two types of polarential systems, known as types A and B, are in use. In half-duplex operation of a type A polarential system, the direct-current balance is independent of line resistance. In half-duplex operation of a type B polarential system, the direct current is substantially independent of the line leakage. Type A is better for cable loops where leakage is negligible but resistance varies with temperature. Type B is considered better for open wire where variable line leakage is frequent.e where variable line leakage is frequent.
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41563
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1245
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| rdfs:comment |
A polarential telegraph system is a direct … A polarential telegraph system is a direct-current telegraph system employing polar transmission in one direction and a form of in the other. Two types of polarential systems, known as types A and B, are in use. In half-duplex operation of a type A polarential system, the direct-current balance is independent of line resistance. In half-duplex operation of a type B polarential system, the direct current is substantially independent of the line leakage. Type A is better for cable loops where leakage is negligible but resistance varies with temperature. Type B is considered better for open wire where variable line leakage is frequent.e where variable line leakage is frequent.
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| rdfs:label |
Polarential telegraph system
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