This AETHIS own developed TrafMon technology originates from the
time-critical stringent communications quality performances of the
worldwide Ground Segment network underlying the provision of advance
Integrity services by GALILEO, the European Satellite-based Positioning
TrafMon monitors in details all IP packets or every (directional) traffic
flow over one or several network communication links.
It is based on a number of software network probes that look a the
network traffic, and send information to a central collecting point.
At this central collector (Central Processing System) packet latency
and other Key Performance Indicators KPIs) are calculated and reported.
TrafMon measures the per-flow one-way packet latency at the millisecond
accuracy. And the tool detects every packet loss
The TrafMon tool has already been used by ThalesAleniaSpace France for
the qualification of the links between Galileo Mission Control Center
in Italy and, respectively, the Galileo Sensor Station and Galileo
Uplink Station in Kourou, French Guyana.
Thanks to the precise measurements produced by the tool, its use has
permitted to fine tune the packet priority management algorithm as well
as to pinpoint an interface problem that led to seldom but excessive
amount of packet losses
TrafMon Tool Main Characteristics
TrafMon features several important characteristics that uniquely addresses
rather specific needs not otherwise responded to by other market
- The TrafMon tool responds to the dual need of temporarily troubleshooting
under-optimal quality of critical network links as well as in continuously
reporting on quality metrics and on traffic behavioural characteristics of
- TrafMon measures the actual user traffic instead of requiring injection
of supplementary measurement traffic load.
- TrafMon collects is measurements at one or several points in the network
path and from within the site access infrastructure.
- The TrafMon probe is a lightweight software component that can be
deployed on non-necessarily dedicated Linux computers equipped with one
or more probing network interfaces.
- The TrafMon probes measurements can be centralised online, in order to
display the live performance figures within minutes.
- The protocol used for observations repatriation has been carefully
designed to have no impact on the measured traffic:
- The TrafMon own traffic counts for less than 1% of the measured
- The TrafMon own traffic can be fully controlled with a minimum
delay imposed between probe packets
- A maximum size can be imposed to the probe packets, so as to avoid
delaying a time-critical packet during WAN serialisation
- The TrafMon protocol is reliable with automatic retransmission
- This TrafMon protocol is also used as heart beat allowing to detect
a broken connectivity with a distant probe
The TrafMon unique technology and flexibility of deployment is
further described in the present
TRAFMON-III WHITE PAPER.