AboutLuis Emiliani Expertise Strengths
- Satellite link design and analysis
- Vsat network design and analysis
- Propagation aspects for terrestrial and satellite links
- ITU-R P recommendations
Can not help with:
- Questions related to TV receivers, TV kits, or specific networks such as DirecTV or DISH
- Antenna pattern synthesis, RF MoM analysis, S-parameters.
Experience My experience is in satellite communication networks and terrestrial microwave links.
Expert: Luis Emiliani Date: 6/6/2008 Subject: SATELLITE DATA NETWORK
Question Sir I am working for an engineering solution provider in Pakistan. I have been given a task to suggest best method for establishing a data network between Laptops on vehicles. vehicles may be stationed anywhere across Pakistan. Data from them is used for real time simulation so minimal delay is required, data rate around 9.6kbps is feasible but it should be reliable.
I would be very grateful if you suggest some solution. Thanking you in aticipation
Regards,
Kashif Masud
Answer hi
well, 9.6Kbps is really nothing, so you have lots of options available
the first one that comes to mind is either CDPD or GPRS. Those two refer to data transmissions over a cellular network (GSM or TDMA as per the US standard) and it all depends on whether you have coverage.
fopr this, you would have to equip the laptops with appropriate cards or modems.
the second option is to use iridium or globalstar and transmit data inband as if it were a fax, or using any modems over those networks as if they were phone lines.
delay is around 150ms i would guess. it would be a bit expensive and you need to check with providers in your country to understand their rates. you might be charged by volume of data passed though...
third option, inmarsat GAN or BGAN. they are able to give you more than 9.6Kbps and also i believe would be very very expensive. they do charge per time or per data volume. check with local providers. this solution require you to be stationary, while the previous two allowed you to communicate while moving.
fourth option, go to transportable vsats. very expensive, but also able to give you the highest throughput. since you do not need this, i assume you can forget about them for the time being.
as i said, focus your search of local providers in the first two categories. mobile providers and iridium/globalstar service resellers.
