QoS Basics

Characteristics that QoS can effect;

  • Bandwidth
  • Delay
  • Jitter (Delay Variation)
  • Packet loss

QoS Tools that effect bandwidth;

  • Compression
  • CAC (Call Admission Control)
  • Queuing

Types of delay;

  • Serialisation (fixed)
  • Propogation (fixed)
  • Queuing (variable)
  • Forwarding/Processing (variable)
  • Shaping (variable)
  • Network (variable)
  • Codec (variable)
  • Compression (variable)

QoS tools that affect delay;

  • Queuing
  • Link Fragmentation and interleaving
  • Compression
  • Traffic Shaping

QoS tools that effects Jitter;

  • Queuing (CQ, MDRR, CBWFQ)
  • Link Fragmentation and interleaving
  • Compression
  • Traffic Shaping

QoS tools that effect loss

  • Queuing
  • RED
  • WRED
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