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  2. Call-progress tone - Wikipedia

    en.wikipedia.org/wiki/Call-progress_tone

    Telecommunication equipment such as fax machines and modems are designed to recognize certain tones, such as dial tone and busy tone. The ITU-T E.180 and E.182 recommendations define the technical characteristics and intended usage of some of these tones. ToneScript is a tone description format that may be used to specify the tone.

  3. Reorder tone - Wikipedia

    en.wikipedia.org/wiki/Reorder_tone

    The reorder tone, also known as the fast busy tone, or the congestion tone, or all trunks busy (ATB) tone is an audible call progress tone in the public switched telephone network (PSTN) that is returned to a calling party to indicate that the call cannot be processed through the network.

  4. Precise tone plan - Wikipedia

    en.wikipedia.org/wiki/Precise_tone_plan

    Low tone, also busy tone, is defined as having frequency components of 480 and 620 Hz at a level of −24 dBm and a cadence of one half second ON and one half second OFF. Reorder tone, also often called fast busy tone, is the same tone, but with a cadence of 0.25 of a second ON and 0.25 of a second OFF. The original plan had two slightly ...

  5. Telex - Wikipedia

    en.wikipedia.org/wiki/Telex

    A Teletype Model 32 used for telex service. Telex is a telecommunication system that allows text-based messages to be sent and received by teleprinter over telephone lines. The term "telex" may refer to the service, the network, the devices, or a message sent using these. [1]

  6. Bell 103 - Wikipedia

    en.wikipedia.org/wiki/Bell_103_modem

    The American synth-pop band Information Society featured a track entitled "300bps N, 8, 1 (Terminal Mode or Ascii Download)" on their album Peace and Love, Inc. that could be decoded to a text message by holding a phone handset connected to a Bell 103 modem up to the speaker playing the track.

  7. Why do teens say, ‘Fax, No Printer’? - AOL

    www.aol.com/news/why-teens-fax-no-printer...

    Wright says inspiration for the slang is older than a fax machine itself. “The use of ‘fax’ as a fun phonetic play on ‘facts’ dates back to at least 1837, as documented by the Oxford ...

  8. Busy signal - Wikipedia

    en.wikipedia.org/wiki/Busy_signal

    A busy signal (or busy tone or engaged tone) in telephony is an audible call-progress tone or audible signal to the calling party that indicates failure to complete the requested connection of that particular telephone call. The busy signal has become less common in the past few decades due to the prevalence of call waiting and voicemail.

  9. T.38 - Wikipedia

    en.wikipedia.org/wiki/T.38

    As shown in the diagram below, a T.38 gateway is composed of two primary elements: the fax modems and the T.38 subsystem. The fax modems modulate and demodulate the PCM samples of the analog data, turning the sampled-data representation of the fax terminal's analog signal to its binary translation, and vice versa.