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VoIP Testbed Packet / Speech Based

  • 18 PCs (Linux + Windows 2000)
  • Netgear WAG511 Dual Band WLAN cards (Atheros chip set)
  • Cisco 1200 AP (firmware upgraded to IOS 12.3(7)JA2 ) on Channel 6
    • Capable of 802.11e EDCA operation
  • Traffic generators
    • RTP Tools (Columbia University) to simulate VoIP calls
    • 4 state Markov model (follows ITU-T P.59 recommendation)
    • Selection of audio codecs: G.711, G.729, G.723.1
    • MGEN Traffic Generator (Naval Research Lab) to simulate background traffic
  • NTP for timing synchronisation
  • Paxson’s algorithm to remove clock-skew
  • Simulators for de-jitter buffering
  • Extended E-model for call quality assessment
  • WLAN Resource Monitor application
  • Linux Cron daemon used to control experiments
Hamilton Institute - National University of Ireland Maynooth - Co. Kildare - Ireland Tel. + 353 (0) 17086100 - Fax. +353 (0) 17086269 - email hamilton@nuim.ie