You can't define it that way for satellite because different size terminals will use different modulations. Also rain fade at >20GHz frequencies. Links will be engineered to be max modulation at 99.995 to 99.999% of the time, but modulation will vary. Both due to rain storms over the end user terminal and rain at the teleport end.
1.6 Gbps per beam is sort of a round number for marketing purposes. An o3b terminal could be 1.8 to 3.5 meters in size (antenna pair). Also bandwidth is rarely symmetric like a terrestrial FDD link. An ISP more commonly would buy a circuit like 20 Mbps down, 6Mbps up. On Feb 23, 2016 6:06 PM, "Chuck McCown" <[email protected]> wrote: > O3B > 216 MHz per beam > 1.6 Gbps per beam > 7.4 bits per hz > > *From:* Eric Kuhnke <[email protected]> > *Sent:* Tuesday, February 23, 2016 7:01 PM > *To:* [email protected] > *Subject:* Re: [AFMUG] Viasat-3 going up > > > If you Google "SCPC VSAT" you'll see the geostationary equivalent of what > o3b is competing with... 495ms latency, dedicated 1:1 ratio frequency > allocation, FDD. Usually 2.4 meter and larger sized dishes. > > o3b provides a 100/1000 Mbps Ethernet handoff from the satellite modem > that us logically the same, but much lower latency and less $/month per > dedicated Mbps. > > From a router or network equipment perspective the two can be identical, > or different... An SCPC circuit can be a layer 2 bridge between two > modems, or a /30 OSPF link net, or an IP default route (your ISP owns the > far end and gives you a /29 or 30 and default GW). > On Feb 23, 2016 4:36 PM, "Joe Novak" <[email protected]> wrote: > >> I had never heard about O3B. I have always been interested in the tech. >> >> >> https://youtu.be/wseRrx5AO1c >> >> Demonstrating LTE over O3B. >> >> On Tue, Feb 23, 2016 at 3:12 PM, Chris Wright <[email protected]> >> wrote: >> >>> They did 20mbps error-free from Earth ground station to LADEE. So yeah, >>> two way communication isn’t quite there yet. Maybe with advances in >>> atmospheric interferometry I’ll be better in both directions in a couple >>> years. >>> >>> >>> >>> Chris Wright >>> >>> Network Administrator >>> >>> Velociter Wireless >>> >>> 209-838-1221 x115 >>> >>> >>> >>> *From:* Af [mailto:[email protected]] *On Behalf Of *Eric Kuhnke >>> *Sent:* Tuesday, February 23, 2016 12:39 PM >>> >>> *To:* [email protected] >>> *Subject:* Re: [AFMUG] Viasat-3 going up >>> >>> >>> >>> that was a one way transmission while being tracked by what was >>> basically a multi million dollar optical telescope - for something that a >>> teleport operator can afford, in the price range of a large ku or ka-band >>> dish ($150,000 or less), the tech isn't quite there yet. >>> >>> it wasn't something with two way syn/ack like TCP... >>> >>> >>> >>> >>> >>> On Tue, Feb 23, 2016 at 12:37 PM, Chris Wright <[email protected]> >>> wrote: >>> >>> LADEE did 622mbps from 385,000km (lunar orbit to earth’s surface) two >>> years ago. >>> https://en.wikipedia.org/wiki/Laser_communication_in_space#Flight_tests >>> >>> >>> >>> Chris Wright >>> >>> Network Administrator >>> >>> Velociter Wireless >>> >>> 209-838-1221 x115 >>> >>> >>> >>> *From:* Af [mailto:[email protected]] *On Behalf Of *Bill Prince >>> *Sent:* Tuesday, February 23, 2016 11:28 AM >>> *To:* [email protected] >>> *Subject:* Re: [AFMUG] Viasat-3 going up >>> >>> >>> >>> I think that would be a stretch. Getting laser to penetrate even 1 km if >>> atmosphere is tough, and there is quite a bit more of that going straight >>> up. >>> >>> bp >>> >>> <part15sbs{at}gmail{dot}com> >>> >>> >>> >>> On 2/23/2016 11:26 AM, Chuck McCown wrote: >>> >>> Do any of these newer satellites use laser as uplink? >>> >>> >>> >>> *From:* Eric Kuhnke <[email protected]> >>> >>> *Sent:* Tuesday, February 23, 2016 12:25 PM >>> >>> *To:* [email protected] >>> >>> *Subject:* Re: [AFMUG] Viasat-3 going up >>> >>> >>> >>> An o3b terminal is an identical pair or motorized, tracking 1.8, 2.4 or >>> 3.0 meter sized dishes. Make-before-break connection. There are some good >>> videos online illustrating how it works. >>> >>> On Feb 23, 2016 10:22 AM, "Sean Heskett" <[email protected]> wrote: >>> >>> If the satellite isn't in geo-synchronous orbit then how do you stay >>> locked on to the signal? Do they have a constellation of satellites? >>> >>> >>> >>> -Sean >>> >>> On Tuesday, February 23, 2016, Chris Wright <[email protected]> wrote: >>> >>> O3B altitude is 8062km. At that distance, it takes light about 27ms to >>> travel. Multiply that by 4 (CPE -> Sat -> Gateway -> Sat -> CPE) and add a >>> couple ms for frame processing, and you’re at 110ms latency to the provider. >>> >>> >>> >>> Chris Wright >>> >>> Network Administrator >>> >>> Velociter Wireless >>> >>> 209-838-1221 x115 >>> >>> >>> >>> *From:* Af [mailto:[email protected] <[email protected]>] *On >>> Behalf Of *Joe Novak >>> *Sent:* Tuesday, February 23, 2016 7:15 AM >>> *To:* [email protected] >>> *Subject:* Re: [AFMUG] Viasat-3 going up >>> >>> >>> >>> What kind of latency are we talking? Very interesting stuff. >>> >>> >>> >>> On Mon, Feb 22, 2016 at 3:04 PM, Eric Kuhnke <[email protected]> >>> wrote: >>> >>> The greatest thing currently happening in satellite telecommunications >>> is not more geostationary ka-band capacity, but the market pricing in >>> wholesale that has happened due to o3b. For locations anywhere below 45 >>> degrees latitude o3b provides end to end trunking at a lot less latency, >>> and lower prices then geostationary systems. Viasat and other owners of >>> geostationary capacity have been required to drop the monthly recurring >>> prices for wholesale transponder capacity. >>> >>> The big difference being that an o3b terminal is too expensive by far >>> for an end user, it would be typically used by a medium to large sized >>> Wireless ISP using point-to-multipoint technology for the individual >>> customers. For example a WISP on a pacific island nation state that has no >>> submarine fiber access. >>> >>> On Feb 21, 2016 9:13 PM, "Rory Conaway" <[email protected]> wrote: >>> >>> >>> http://www.fastcompany.com/3056618/fast-feed/these-terabit-satellites-will-bring-internet-to-the-remotest-places-on-earth >>> >>> >>> >>> *Rory Conaway • Triad Wireless • CEO* >>> >>> *4226 S. 37th Street • Phoenix • AZ 85040* >>> >>> *602-426-0542 <602-426-0542>* >>> >>> *[email protected] <[email protected]>* >>> >>> *www.triadwireless.net <http://www.triadwireless.net>* >>> >>> >>> >>> “The ultimate measure of a man is not where he stands in moments of >>> comfort or convenience, but where he stands at times of challenge or >>> controversy” – Martin Luther King >>> >>> >>> >>> >>> >>> >>> >>> >>> >> >> >
