Exfo EXpert IPTV Test Tools (FTB-200v2) Manual do Utilizador descarregar pdf (Página 71)

71

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A.5 IGMPLatencyvs.Zaptime

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Thezaptimeisthetotaldurationfromthetimeviewerpres sesthechannelchange

button,tothepointthepictureofthenewchannelisdisplaye d,alongwithcorresponding

audio.Thesekindofdelaysexistinalltelevision

systems,buttheyaregreaterindigital

televisionandsystemsthatusetheInternetlikeIPTV.Humaninteractionwiththesystemis

completelyignoredinthesemeasurements,sozaptimeisnotthesameaschannelsurfing

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KeyFactorsaffectingZapTime

 Encoding

 Network

 SettopBox(leaveandjoins)

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Exfo EXpert IPTV Test Tools (FTB-200v2) Manual do Utilizador Página 71