Exfo EXpert IPTV Test Tools (FTB-200v2) Instrukcja Użytkownika Pobierz pdf (Strona 71)

71



A.5 IGMPLatencyvs.Zaptime



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

.

KeyFactorsaffectingZapTime

 Encoding

 Network

 SettopBox(leaveandjoins)

1 2 ... 66 67 68 69 70 71 72 73 74 75 76 ... 81 82

Brak uwag

Exfo EXpert IPTV Test Tools (FTB-200v2) Instrukcja Użytkownika Strona 71