Pro AV Catalog

The Internet Video Problem:

• The Internet was never designed for Video
• "Best-Effort" Transport Only
• No Prioritization
• Routers Drop Packets to Alleve Congestion
• Dynamic Load Balancing Reorders Packets

Traffic is either UDP or TCP

• UDP Transport is Real-Time, but Lossy
• No Inherent Packet Recovery
• No Guarantees on Packet Order
• TCP Uses Positive Acknowledgement Packet Recovery
• Not Real-time: Pauses for Unrecoverable Packets
• Max Bitrate Limited by Distance & Node Hops

The Internet Video Solution: ARQ – Automatic Repeat Request

• Automatic Repeat reQuest
• Feedback Requests Resending Lost Packets
• Receiver Delay to Allow Time for Recovery
• Add Receiver Buffer to Create Delay
• More Resilience ? Larger Buffer
• Lower Latency ? Smaller Buffer
• Capable of 100% Recovery
• Capable of Full Recovery with Large Loss %
• Zero Overhead on a Clean (Lossless) Network