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- W2092202764 abstract "Single-frequency signaling liberates dial systems from the restrictions of dc signaling methods. This freedom, as might be expected, is most important in the long distance telephone plant where trunks are frequently too long or have no conductors for dc signaling. The general plan of signal frequency (SF) signaling is based upon continuous signaling because of it's speed and reliability. In this respect it is like the usual dc trunk signaling schemes. SF uses steady current in the trunk signaling path for the normal idle trunk condition and no current in the signaling path for the other and alternate busy (talking) trunk condition. This choice of signal conditions is essential for SF signaling in-band systems, which as the name implies operate within the standard voice channel, to avoid conflict between signal and voice transmission. The same conditions are also used in SF out-of-band and separate line systems. The in-band SF system can be used with any type or length of line facility that meets normal voice transmission requirements and is therefore the preferred method used by the Bell System to meet requirements for toll dialing on a national basis, with other signaling arrangements limited to the shorter trunks. The requirements, design considerations, main features, and method of operation for the in-band system are outlined in this paper." @default.
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- W2092202764 date "1954-11-01" @default.
- W2092202764 modified "2023-09-23" @default.
- W2092202764 title "In-Band Single-Frequency Signaling" @default.
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- W2092202764 doi "https://doi.org/10.1002/j.1538-7305.1954.tb03755.x" @default.
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