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About: 2600 hertz     Goto   Sponge   NotDistinct   Permalink

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2600 hertz (2600 Hz) is a frequency in hertz (cycles per second) that was used by AT&T as a steady signal to mark currently unused long-distance telephone lines. During the 1960s, in-band signaling was used, so the same line for both voice conversations and telephone connection management signals. Since a pause in a voice conversation would produce silence, another method was required for switches to determine whether a line was in use. The solution AT&T created was to produce a 2600 Hz tone on idle trunks.