... Consequently, it becomes the best choice for xDSL, IPTV, VOIP service confirmation testing, maintenance and troubleshooting.2. Key Features ... viewing-Powerful DSL test functions-Makes determining IPTV and VoIP quality fast 3.Main FunctionsDSL TestxDSL testPhysical layer ... during the process of IPTV initialization. Include:Line fault, Modem fault, STB fault, PPPoE dial fault, IPTV operation ...