Exfo EXpert IPTV Test Tools (FTB-200v2) Uživatelský manuál stáhnout pdf (Strana 72)

72



Examples:

Inthissectionsometypicalvaluesofzaptimeareshown.Actually,inIPTVtelevisionthese

delaysaregreaterthaninothertechnologies:

 Analog(Cable

)~1s

 Analog(off‐air

)~1–3s

 MPEG2overQAM

~1.2–3s

 MPEG2overQPSK

~2–4s

 MPEG2overIPTVMulticast~1.5–3.5s

 H.264overIPTVMulticast~1.7–4s

IGMPisthesignalingprotocolusedtoaccessbroadcastvideoservicesthatuseamulticast

networkdesigntoefficientlymanagenetworkbandwidth.Inthisimplementation,ajoin

messageissentfromtheSTBtothenet

work.

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 81 82

Žádné komentáře

Exfo EXpert IPTV Test Tools (FTB-200v2) Uživatelský manuál Strana 72