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vrf GPIB Lan Gateway

Question asked by rsb on Dec 2, 2003
> The telemetry system is located 47 miles away over several mountains.  The location has an OC-3 ATM microwave for communications.  The first 17 miles uses the microwave.  The rest we have on fiber to our lab.  I wanted to have the lab personnel get the SA and O'scope displays directly.  I think keeping a computer out at the TM site will add additional delay to reading the test equipment and another source of potential failure (although I will still have a backdoor to the equipment incase the gateway fails).  If the gateway can provide the display data directly to the lab then we could have the displays generated on their screens.  VEE would only need to exist at the lab and not the TM site.
>

That's a question of what the instruments can do- not the gateway. If the
instrument can send its display out over GPIB great- otherwise you
download trace data or the like and create a display.

> The data on the NI gateway says >900KBps thruput, the agilent unit says around 200KBps (I believe that this must be incorrect).  I have not checked the Tek solution yet.
>

Could easily be a moot point since it is very unlikely that your
instruments can communicate at even the 1.6Mb rate. That might be the first
place to look: what data rate does your instrument set support.

Sounds like what you really want is network-ready instruments so that you
can eliminate the GPIB alltogether


> Even yet, if I do put a computer at the site I could use the USB-GPIB solution.  That saves cost but adds additional code to put the USB data onto the network.
>
>

Not really- just set up the computer as the gateway. IO libraries
makes this very simple - no special code at all.

Stan
> -----Original Message-----
> From: Stan Bischof [mailto:rsb@soco.agilent.com]
> Sent: Tuesday, December 02, 2003 9:08
> To: VRF
> Cc: vrf@agilent.com
> Subject: [vrf] Re: GPIB Lan Gateway
>
>
> > I am evaluating the GPIB LAN Gateway products from Agilent and NI.  The project is a remote Telemetry System that needs to return spectrum analyzer and oscilloscope displays.  I have a dedicated Ethernet for this project.  Which product in anyone's experience provides the fastest throughput?  I am interested in providing the best update rates I can across a 10 meg Ethernet.  I have a P4-2.4GHz running XP Pro.  I also have some NI 8212 PCI GPIB controller with Ethernet.  Is it possible to use this product for the gateway?
>
>
> No idea about the 8212, but the question of thruput is
> the important one. Unfornutanely it can't be directly answered
> since the gateway itself is unlikely to bethe bottleneck. This
> will depend highly upon what instrument you are using
> and what sort of data.
>
> Most any SA or scope will be slower than GPIB speeds so
> quite likely measurement speed will be your slowest point.
> If you are sending lots of small chunks of data that 10 meg
> ethernet could easily be the bottleneck. Or if you have large
> chunks sent quickly the GPIB link could be slowest. Or conceivably
> the gateway- but it is about last in line.
>
>
>  I'd suggest a few simple experiments to see which is slowest
> section for your work. Like stat by hooking the SA direct
> to a plugin card (will be faster than any network solution)
> and see what performance you get.
>
> A dedicated LAN segment driving a gateway is great for most
> applications.
>
> Since you mention remot telemtry, have you considered a wireless
> link? That should be great with the gateways also.
>
> Stan
>
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