Encyclopedia > Polarential telegraph system

  Article Content

Polarential telegraph system

In telecommunication, a polarential telegraph system is a direct-current telegraph system employing polar transmission in one direction and a form of differential duplex transmission in the other.

Note: 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 better for open wire[?] where variable line leakage is frequent.

Source: from Federal Standard 1037C and from MIL-STD-188



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Michael Barrymore

... - Wikipedia <<Up     Contents Michael Barrymore Michael Barrymore, born 4 May 1952, is a British comedian famous for his variety ...

 
 
 
This page was created in 74.2 ms