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- Guard_tone abstract "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 level of the transmitted data signal power.It is used with V.22 and V.22bis modulation modes to prevent the high-band data signal from interfering with the operation of billing apparatus in certain countries where in-band signalling was commonplace in the 20th century.1800 Hz is used in the UK and some Commonwealth countries, while 550 Hz is used in some Scandinavian countries. Guard tones are not used in North America.The guard tone is controlled by the &G AT command of the Hayes command set.North American Bell 103-style modems (300 bit/s) were incompatible with UK in-band signalling (the modem tones would disconnect the call) unless a guard tone is provided. Most of these (now-obsolete) modems did not support any command set and were unusable for international calls.".
- Guard_tone wikiPageID "698468".
- Guard_tone wikiPageRevisionID "569454917".
- Guard_tone hasPhotoCollection Guard_tone.
- Guard_tone subject Category:Modems.
- Guard_tone subject Category:Telephony_signals.
- Guard_tone type Artifact100021939.
- Guard_tone type ElectronicEquipment103278248.
- Guard_tone type Equipment103294048.
- Guard_tone type Instrumentality103575240.
- Guard_tone type Modem103777754.
- Guard_tone type Modems.
- Guard_tone type Object100002684.
- Guard_tone type PhysicalEntity100001930.
- Guard_tone type Whole100003553.
- Guard_tone comment "Guard tone is a feature of wireline modems.The guard tone is sent by the answering modem after it has sent the answer tone.".
- Guard_tone label "Guard tone".
- Guard_tone sameAs m.033qvn.
- Guard_tone sameAs Q5613984.
- Guard_tone sameAs Q5613984.
- Guard_tone sameAs Guard_tone.
- Guard_tone wasDerivedFrom Guard_tone?oldid=569454917.
- Guard_tone isPrimaryTopicOf Guard_tone.