Bandwidth Efficiency Factors

• IP/RTP field changes

  • RTP Time Stamp
    • Voice applications with VAD
    • Not a big factor
  • IPID
    • IPID may change randomly
    • Larger factor in bandwidth efficiency

• Layer 2 encapsulation

  • Multiplexing gains large for IP/AAL-5
    • ATM cell tax
  • Multiplexing gains less for variable length packet encaps
    • HDLC, Frame Relay

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