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Interference in Composited CircuitsComposite equipment is so designed that normally the telegraph signals do not interfere with telephone conversations. Also, the design is such that this equipment causes very little transmission loss in the telephone circuits. The telegraph frequencies employed are not readily reproduced by a telephone receiver. The harmonics of these frequencies are in the voice range, however, and would cause interference if not suppressed by the composite arrangements. If, owing to defective or improper terminal apparatus, the telegraph currents are audible in the telephone circuit, the name telegraph, or Morse, thump is given to this interference. (See also page 318.)
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Last Update: 2011-05-30