Atec JDSU-SC-ADSL - Manual (Page 3)

COMMUNICATIONS TEST & MEASUREMENT SOLUTIONS
3
With its improved downstream rates, ADSL2+ is the preferred technology to
deliver IPTV. IPTV requires the installation of a set top box (STB) to decode the
compressed video stream for both broadcast and video-on-demand (VoD)
services. But transmitting IPTV streams through the network is far more
challenging than other broadband services. Broadband applications other than
IPTV (such as web browsing and file sharing) mainly use IP/TCP (Internet
protocol/transmission control protocol) with acknowledgment that sent packets
have been received and a retransmission, in case of lost packets. Unlike IP data
services, IPTV is a highly compressed, real-time application, and lost video packets
caused by intermittent problems with the transport or video stream can directly
be visible to the user in the form of pixelization, blurring, and frame freezes. In
addition, poor transaction quality (to receive program channels) and poor overall
content quality may also occur, further impacting the customer experience.
Picture: Blurring, Edge Distortion, Visual Noise
Audio: Lip Sync, Drop Outs
Content Quality
Video Stream Quality
Transport Quality
Transaction Quality
Video QoS
Video Quality Layers
Video QoE Indicators
Error Indicator Count
Pixelation, Tiling, Frame Freezes, Blue Screen
Continuity Error
PCR Jitter
RTP Packet Jitter
RTSP Latency (VOD)
IGMP Latency (BC-TV)
PSI Table Data (Error)
RTP Packet Loss
Service Accessibility, Channel Change Latency,
Pause, Play Latency, Service Latency