Incidentally, speaking of RB Metal. Does anyone 'out there' do anything (or have any use for) 900MHz gear? Reason I ask is that MT have just released a 900MHz version of RB Metal (http://routerboard.com/RBMetal9HPn) and I'm wondering whether there is any demand for it in ANZ. I *think* most countries in our region follow the same regulatory guidelines, which makes 900MHz pretty useless for any bandwidth requirements of more than a few megabits, so I'm not sure whether it is something that we should keep some stock of? Anyone? :-} Cheers, Mike.
I 'think' the available bandwidth is only 915-928MHz @ 1W EIRP. So Really you would be limited to a channel in the middle using 5 or 10MHz bandwidth. That said I'd love to see how 900MHz performs for difficult line-of sight deployments @ low bandwidth. I guess the other thing to consider is appropriate antennas to source for this band which will reflect on the kind of deployment one would do on this band (Campus/ building to building ? ). Interesting dilemma anyhow whether to stock in Aus( Maybe make it a special order item ). Cheers Greg VK3JIY -------------------------- On 17/06/2014 7:20 PM, Mike Everest wrote:
Incidentally, speaking of RB Metal.
Does anyone 'out there' do anything (or have any use for) 900MHz gear?
Reason I ask is that MT have just released a 900MHz version of RB Metal (http://routerboard.com/RBMetal9HPn) and I'm wondering whether there is any demand for it in ANZ.
I *think* most countries in our region follow the same regulatory guidelines, which makes 900MHz pretty useless for any bandwidth requirements of more than a few megabits, so I'm not sure whether it is something that we should keep some stock of?
Anyone? :-}
Cheers, Mike.
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Hi,
I 'think' the available bandwidth is only 915-928MHz @ 1W EIRP. So Really you would be limited to a channel in the middle using 5 or 10MHz bandwidth.
That's right (see item 45 of http://www.comlaw.gov.au/Details/F2013C00396) I can't find any data rate tables for 802.11n using 10MHz channels, but best throughput on 20MHz with single chain and top modulation and coding rates is only 732.2M, which probably equates to about 45M of udp payload and 20M of TCP... Assuming that half the channel width will deliver up to about half of that throughput, then we come down to maximum of around 10M of tcp throughput - which is not too bad if 900M is the only band that will manage a link for difficult (i.e. trees, hills, buildings, etc) applications. Whether my calculations or assumptions are even slightly valid is a complete different question.
That said I'd love to see how 900MHz performs for difficult line-of sight deployments @ low bandwidth.
I guess the other thing to consider is appropriate antennas to source for
I've seen some motorolla canopy used in a regional WISP environment back in the early days of 'broadband' internet, and it sure is utterly amazing as far as penetration goes. It worked great for a solid link through 200m of thick forest, but they were configured for 5MHz channels, with max abot 2Mbps service ('standard' broadband service in those days was still 256K ;-) this
band which will reflect on the kind of deployment one would do on this band (Campus/ building to building ? ).
I don't think it would be worth bothering for that kind of application - There are a few MikroTik networks used for telemetry systems managing stuff like water/sewer pumping stations and valve controls or conveyer systems or farm stock control (opening gates, running water pumps, feeding station augers, etc) Those are more likely to be where this stuff might be useful - but there's not a huge demand (yet) for those kinds of automations...
Interesting dilemma anyhow whether to stock in Aus( Maybe make it a special order item ).
I guess I'll just have to buy some and try it out! :-D May take a couple of months to warrant forking out for a carton of them, but when/if I do, I will be sure to report back here with some indicative results! :) Cheers, Mike.
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