> On Feb 8, 2017, at 8:38 PM, Brett A Mansfield <li...@silverlakeinternet.com> > wrote: > > Hi, > > I've never yet done a licensed link and there is plenty of these two > frequencies available in my area. I need to be able to get 500Mbps at about > 15 miles. Is that possible with either of these?
Possible in either frequency. 11Ghz will do it reliably with smaller antennas than 18Ghz. > > What kind of real world speeds can I expect out of these and what channel > size do I need to license to get those speeds? 55Mhz at 2048QAM will get you ~526Mbps each direction, 80Mhz @ 2048QAM will get you just under 600Mhz. All of the traditional packet microwave gear does exactly what it says. If you choose to go with some of the newer ‘wifi’ based gear you will want to do a bit more research on performance. Traditional gear generally funs full packet rate with 56byte packets with no packet loss or latency variation. Check how much of the channel that you license actually gets used. 11Ghz usually has a max channel size of 40Mhz, but you can combine 2 to get 80Mhz. Some equipment uses all 80Mhz, some uses 55Mhz of the 80Mhz path. Some vendors have different part numbers for the 55Mhz and 80Mhz radios. > > Is there something else I should consider? What brand/model radios and > dishes, what other frequencies for easier licensing, etc? Probably not. Cambium, Dragonwave, SAF, Trango, Mimosa, CTI, LigoWave, Ubiquiti, and others make equipment in this space. > > It would be great to be able to get a gig that distance, but I'm trying to be > realistic and get just what I really need to start with. You can get Gig but you will need to license both polarities and purchase appropriate equipment - probably going to be close to 18k though some vendors may be lower. > > No legal advice please, just your experience with it and any knowledge you'd > be able/willing to share with the licensing of these frequencies. The major differences in the licensed gear is the feature sets - hitless modulation changes, hitless power adjustments with modulation change, does the radio ramp up power as modulation drops or are you limited to the power level of the highest modulation, is out of band management available, is the management port VLAN aware, is the data path transparent, what is the max MTU of the data path, does the data path have a switch in it that interferes with STP/MSTP/RSTP/OAM/MetroE type packets, how is QOS and/or DSCP handled, how is VLAN and/or QinQ handled. Different vendors have different answers to those questions. > > Thank you, > Brett A Mansfield >
