- guard tone
- A tone that is sometimes sent over the phone line for echo suppression. 1800 Hertz and 550 Hertz are sometimes used.
Dictionary of telecommunications. Д.С.Иносов. 2000.
Dictionary of telecommunications. Д.С.Иносов. 2000.
Guard tone — is a feature of wireline modems.The guard tone is sent by the answering modem after it has sent the answer tone. It is a single continuous tone with a frequency of either 1800 Hz or 550 Hz, sent at a level of 6dB or 3dB, respectively, below the… … Wikipedia
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