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Navigating IP Service Quality: QoS, Latency, and Class of Service Explained

This detailed overview explores the complexities of IP service quality, focusing on Quality of Service (QoS), latency, and various classes of service (CoS) in telecommunications. It outlines the characteristics of VoIP, VPNs, and best-effort services, discussing their performance in terms of latency and error rates. The material highlights the importance of proper infrastructure, from traditional transports to modern IP networks, showcasing the differences between UDP and TCP protocols. Understand how shaping services and internet applications can optimize both voice and video traffic for efficient data transmission.

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Navigating IP Service Quality: QoS, Latency, and Class of Service Explained

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Presentation Transcript

  1. Trouble in IP Heaven

  2. Telco Talk • IP Destination • QOS • Class of service • Latency • “Shaped” service

  3. Carriers Infrastructure MegaRoute PSTN Frame Relay ATM Datapac IP ISDN

  4. Carrier’s Future Voice Video VPNs Managed IP Internet App. Services MPLS/IP SONET SONET GE Fibre

  5. Class of Service - Examples • Class 1 - VoIP - Low latency • Class 2 - VPN - Moderate Latency • Class 3 - Best effort - DSL

  6. Voice over IP Low data rate Can Miss info Low latency Video over IP High data rate Needs 10 –10 BER Latency depends on application VoIP and VOIP

  7. Qos Output Buffer Input Buffer Dropped

  8. CRC Errors • Failed Checksum • Traditional transport • Errored info is transferred • IP transport • Bad data… • Tossed out

  9. ITU Y.1541 • Bit Error Rate • Bit Loss Rate

  10. Jumbo Frames • 1500 bits no more • Not WAN material • Can Be over 65,000 bits MTU

  11. UDP vs. TCP • TCP • Confirmed data • Wait until ACKed • UDP • No “Stop lights” • Broadcast Mode • Inherent Higher Priority

  12. Video Data Mb/s Time

  13. “Shaped” Service Meter Marker Shaper Input Dropped

  14. Qos Priority 1 2 3

  15. Video Stream UDP 1 2 3 6 4 7 5 8

  16. File Transfers

  17. Tools etc…

  18. Thanks

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