Internet VoIP Performance Measurements

4/18/99


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Table of Contents

Internet VoIP Performance Measurements

Outline

Acknowledgements for monitoring

Internet Telephony Pilot

What do the links look like

Nov-98 100 byte pings SLAC - CERN

RTT is getting better all the time

Impact of STAR-TAP on KEK.jp <=> SLAC

What about loss?

It’s getting better all the time 1/2

It’s getting better all the time 2/2

Effect of managed bandwidth

Packet trace

Packet details

Jitter SLAC <=> CERN

Round trip delay distribution snapshot

Ping “Jitter” snapshot

Ping response “jitter”

Surveyor “jitter”

Effect of setting TOS precedence bits - courtesy Dave Millsom

Effect of setting precedence bits

VoIP QoS testbed between SLAC & LBNL (courtesy Becca Nitzan)

VoIP jitter LBNL<=>SLAC with load

Early VoIP/QoS testbed results

Reachability

Summary

Transatlantic Links very busy (e.g CERN)

Countries Expected to be Good

Ping response “jitter”

Instantaneous inter-packet RTT magnitude

Complexity

Author: cottrell

Email: cottrell@slac.stanford.edu

Home Page: http://www.slac.stanford.edu/grp/scs/net/talk/

Other information:
R. Les Cottrell, Assistant Director, SLAC Computer Services. Stanford University