Sunday, 9 November 2008

Project 1:

I have been asked to help out on a little project for a friend and as I am not really up to date on all the wireless technologies out there I thought I would do a post to see if anyone else has any ideas.

Basically what I have been asked to do is setup is an outdoor back link to a primary satellite link. There will be a router probably Cisco as I believe they do ruggedised routers (any help on models greatly appreciated) which will be connected to a satellite link. The satellite link will be the primary connection used by a control station to connect to remote sensors in the field. What I need to do is provide a backup link for when the satellite link fails. The only time there should be any problems with the satellite link is when it is absolutely pouring with rain which tends to happen quite a lot on this island. I was looking into GPRS or 3G and at the moment GPRS is my favourite as Cisco have released a new GPRS card for their ISR routers. The initial plan is to connect to the remote sensors over the satellite link and then use the IP SLA service to check that the other end of the link is up. If the satellite link fails then I would want to fail over to the GRPS or 3G connection to make sure that the control station could still connect to the remote sensors.

So I have a couple of questions to anyone who know about these technologies or has setup similar systems. Firstly can you bond GRPS together to get a higher bandwidth connection with a Cisco router? Also how do GRPS and 3G perform in poor weather conditions? Any help out ruggedised routers and outdoor routing systems would be most appreciated.

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