10 gigabit Ethernet 80 GHz point-to-point bridges • Hacker News Board

Re: 10 gigabit Ethernet 80 GHz point-to-point bridges

#91

Post by ArkyBeagle » Sat, Apr 23, 2016, 7:51 PM UTC

cmiller1 wrote: post #84

ArkyBeagle wrote: post #39

Earlier quoted context omitted.

80 GHz isn't quite optical yet. It's a couple octaves down from infrared. SFAIK, it's still very much radio.

Sorry, I work in a photonics lab so in casual conversation more of the spectrum is "optical" to me. I just meant to ask if you just increase your sampling rate doesn't that mean you have to worry more about things like dispersion happening along the path of the signal?

Optical and microwave are sort of an arbitrary distinction, so you're also right :) There's even the "millimeter wave" designation, or E(xtremely)HF.

Different frequencies scatter differently. This isn't bad: https://transition.fcc.gov/Bureaus/Engineering_Technology/Do...

Re: 10 gigabit Ethernet 80 GHz point-to-point bridges

#92

Post by walrus01 » Sun, Apr 24, 2016, 8:51 PM UTC

amazon_not wrote: post #76

ChuckMcM wrote: post #35

Crap, now I need to go buy a couple of these and lobby the nearest data center for some rooftop space. That is the short way of saying I had no idea you could get antenna this effective for wireless data transmission. I'd seen the 5mbps ones but nothing close to a gigabit much less 10 gigabits. Time to draw a 10km radius circle around my home address :-)

Metrolinq has a 1GE product using unlicensed 60 Ghz which is like $500 a pop.

Though you need to be 500-650 meters max from your source of bandwidth for it to be reliable, 60 is super short range.

Re: 10 gigabit Ethernet 80 GHz point-to-point bridges

#93

Post by walrus01 » Sun, Apr 24, 2016, 10:27 PM UTC

amazon_not wrote: post #78

walrus01 wrote: post #30

Earlier quoted context omitted.

not really, fiber is still greatly preferred (For example: it's impossible to do 40Gb by microwave/millimeter wave, but a CWDM 4-channel 4x10GbE passive mux/demux on two strands of singlemode is trivial and very very cheap), or just a pair of 40Gb QSFP 10km reach optics using a single 1550nm wavelength between two routers or metro-E switches. But wireless can reach small cells, rooftops and towers that might be a ver…

Plus there's the reliability factor. With fiber you only have to worry about backhoe fade. Wireless has all kinds of fun failure modes.

Though with small monopole and cellular rooftop sites, MW can frequently be built in a ring or redundant traffic path configuration. Fiber to many endpoint sites like a cell tower is frequently a star topology network with one cable in a linear path along a ROW either aerial or underground.

Re: 10 gigabit Ethernet 80 GHz point-to-point bridges

#94

Post by walrus01 » Mon, Apr 25, 2016, 8:49 AM UTC

amazon_not wrote: post #81

walrus01 wrote: post #50

Earlier quoted context omitted.

millimeter wave waveguide on the rear of a parabolic antenna (30, 60cm dish) is actually circular (cylindrical), supporting dual polarity operation (opposite H and V). Individual radio heads like this russian radio or other 80 GHz radios are still single polarity. In certain scenarios you can mount two radio heads on a T-shaped waveguide on the rear of one dish antenna, one in H, one in V.

Is it a Russian company? I only found Estonian and Swedish contact details on their website. Both countries are very much not Russia.

Yes elva-1 is a Russian company, most likely they're trying to obfuscate that on their English language web presence. It is sort of a shame because they are just as competent as many of the California based microwave engineering firms, and have been around for 25+ years. Their roots are in military radar systems much like some of the Israeli RF companies (Ceragon, etc).