[time-nuts] GPS for Spirent Smartbits
edu at kender.es
Mon Feb 12 17:49:49 EST 2007
After putting the question in TAPR list about GPS, I have been
suggested to put here.
We (at our university research group) use Spirent Smartbits
Hardware... (http://www.spirentcom.com/documents/1374.pdf) They are
network traffic generator. They have ports separate ports that can be
configured to send and receive traffic and you can develop
applications to program it to suit your needs.
If you use only a chasis, you can measure propagation delays or
jitter. If you have an Internet access you can get a time reference
with NTP and even do timed captures. If you use two chasis
(transmiting from one to a wireless system and receiving on the other
chasis far from the previous one) and you don't have Internet access
you can't get a good timing measures. An option is to use GPS
systems. Spirent does offer an solution, but the information on the
is so loose it's difficult to know how difficult is to adapt an
We would like to get 2 GPS timing systems in order to test influence
of handovers in Wimax on moving vehicles. We have already spend much
with the equipment and we would like to study if it is possible to
get a solution at a faction of the cost of "official Smartbit
solution" They use 58503 (HP?) or NanoSync hardware but I don't get
information about the interface levels (ttl or RS-232) or needed commands...
Has anybody experience with this hardware or advices? It seems that
the equipment need more that the 1PPS and NMEA string
PD: I hope it's no so much OT.
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