21-02-2011, 04:15 PM
presented by:
Yuanbin Shen
IPTV.ppt (Size: 1.33 MB / Downloads: 82)
Case Study: Resilient Backbone Design for IPTV Services
Introduction
Nation-wide TV broadcast
Satellite-based
Terrestrial-based (typically over IP networks → IPTV)
IPTV architectural design
Integrate IPTV services with existing IP backbone
Construct a dedicated overlay network on top of IP
Construct a direct interconnected flat IP network
Integrate with an existing switched optical network
What is the best architecture for supporting IPTV?
Overview of IPTV Architecture
IPTV Traffic
Type
Broadcast TV: realtime
VoD download: non-realtime download to VHOs
Realtime VoD: realtime
Characteristics
Uni-directional and high-bandwidth
VoD traffic: highly variable
Multicast for broadcast TV / unicast for VoD
Design Options
Technology:
layer1 (optical) v.s. layer3 (IP/MPLS)
Topology:
hub-and-spoke v.s. meshed
Model 1: Integrate With Existing IP Backbone
Backbone links are shared and access links are dedicated
Rapid deployment: using existing infrastructure
High resource utilization: share bandwidth between applications
Drawback: IPTV quality easily impacted by Internet traffic
Model 2: Dedicated Overlay
Use common backbone routers to construct dedicated IPTV overlay
Easy for performance management: links are dedicated
Overhead to construct the overlay