Fig. 1. The queuing system.

Fig. 2. The probing procedure.

Fig. 3. CDF of the probe loss ratio for a 1 Mb/s peak rate call over a 100 Mb/s link.

Fig. 4. CDF of the probe loss ratio for a 5 Mb/s peak rate call over a 100 Mb/s link.

Fig. 5. A simple one link topology network.

Fig. 6. Probe packet loss with the two different queue schemes for exponential on–off sources of 100 kb/s and 1 Mb/s peak rate.

Fig. 7. Probe losses for both queuing schemes with 3 and 4 packets as discard threshold and 100 kb/s peak rate.

Fig. 8. Probe and data-packet loss rates for 1000 s of testbed experiment.

Fig. 9. Detailed view of probe and data packet loss rates for 40 s of an experimental run.

Fig. 10. Probe packet loss probability for a double-queue system.

Fig. 11. Acceptance probability for a new flow as a function of the load on the system for 100 kb/s call peak rate, with an acceptance threshold of 10⁻².

Fig. 12. Acceptance probability for a new flow as a function of the load on the system for 1 Mb/s call peak rate, with an acceptance threshold of 10⁻².

Fig. 13. Accepted versus offered load for 1 Mb/s call peak rate, with an acceptance threshold of 10⁻².

Fig. 14. Packet loss probability for accepted sessions, for different high-priority queue buffer sizes.

Fig. 15. Sessions versus probe packet loss for 100 kb/s and 1 Mb/s call peak rates.

Link utilization for acceptance probabilities of 5% and 95%