[time-nuts] GPS for Spirent Smartbits

[edu at kender.es]

Hi Rob

Thank you. I'll take a look at it and I'll look if it is possible to use
an old Z3801 I have at least for one end.

Thank you again

Eduardo/EA2BAJ

> Eduardo,
>
> Here is the interface manual for the SmartBits, which describes the GPS
> options.
>
> Rob Kimberley
>
>
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Eduardo Jacob
> Sent: 12 February 2007 22:50
> To: time-nuts at febo.com
> Subject: [time-nuts] GPS for Spirent Smartbits
>
> Hello
>
> 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
> external source.
>
> 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
>
> Best regards
>
> Eduardo/EA2BAJ
>
> PD: I hope it's no so much OT.
>
>
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