Outline of talk

Table of Contents

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Outline of talk

What is SLAC

What is the B-Factory & BaBar?

Requirements

SLAC’s Internet connectivity

High speed data access

DiffServ

VoIP Pilot

Mechanism

VoIP Packet traces

VoIPInter Packet Delays

Performance

Scale of Measurements

Why ping

Nov-98 100 byte pings SLAC - CERN

Improvement in RTT

What about loss?

Improvement in RTT

Improvement in packet loss

Estimated max. bandwidth to selected sites from SLAC

Countries Expected to be Good

What about “jitter”?

Instantaneous inter-packet RTT

Ping “Jitter”

Effect of setting precedence on jitter

Reachability

Monitoring Conclusions 1/2

Monitoring Conclusions 2/2

Further work

More Information & extra info follows

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