Live data from Hacker News

10 gigabit Ethernet 80 GHz point-to-point bridges

elva-1.com

11–20 of 94 posts

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

#11
post #6

I have line of sight to the building where I work, I would love something like this so I could get gigabit internet at home w/o paying through the nose :)

Check out Mimosa's offerings.. For a few hundred dollars you can get ~750mbps via unlicensed spectrum up to ~5km distance.

https://www.mimosa.co/Products/Backhaul/backhaul-specs/B5-Li...

I know Ubiquti has similar products as well but I'm more familiar with Mimosa's.

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

#12

The word "Ethernet" in the title is misleading. That word does not appear in TFA, which appears to discuss a radio transceiver. [EDIT:] I stand corrected; thanks!

It has a 10GbE SFP+ optical interface and functions as a layer 2 ethernet bridge. From an ethernet port perspective same as 99% of the other PTP microwave and millimeter wave radios on the market. What's new is the 10Gb (vs existing radios with 1Gb SFP).

Read the datasheet linked at the bottom of the page.

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

#13
post #6

I have line of sight to the building where I work, I would love something like this so I could get gigabit internet at home w/o paying through the nose :)

Most employers would never let you hook that up - too much risk for zero gain (for them).

Hell mine won't even let me bring my own screen to work. (It lacks some enterprise cert apparently).

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

#14
post #3

Ooh, I really want two of these. I'm stuck on an island with poor last mile service providers. But, I have line of sight to a number of spots with good quality fiber.

If you've got line of sight then current (cheap) tech should do just fine. Sure not 10x gigabit but you can def get some decent internet...

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

#15
It's interesting to see the huge channel bandwidths they're using to attain this. Advances like this are largely driven by higher sample rate ADCs and DACs becoming more viable in recent years.

Edit for clarity: channel bandwidths in the datasheet are up to 2 GHz. Need to close the link at 32 QAM to hit 10 gb before error correction overhead at that bandwidth, which is certainly doable. Also, it's interesting to note that they quote 7 gbps throughput @ 1 GHz bandwidth, and 10 gbps at 2 GHz. It implies that they can run at 256 QAM at 1 GHz, but only 32 QAM at 2 GHz, which also makes sense.

Having worked in the satellite communications industry, where channel sizes used to be limited to 72 MHz (because of hardware limitations of the spacecraft), getting modems designed to operate on larger channels is no small task. I would love to learn more about the internal architecture of these radios to understand exactly what's going on - are they using interleaved ADCs? Is the modulation/demodulation being done in an FPGA, or an ASIC?

If there are terrestrial microwave engineers on here, I'd love to hear your thoughts on this!

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

#16
post #14
post #3

Ooh, I really want two of these. I'm stuck on an island with poor last mile service providers. But, I have line of sight to a number of spots with good quality fiber.

If you've got line of sight then current (cheap) tech should do just fine. Sure not 10x gigabit but you can def get some decent internet...

Do you have any recommendations for current products for line of sight?

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

#17
post #15

It's interesting to see the huge channel bandwidths they're using to attain this. Advances like this are largely driven by higher sample rate ADCs and DACs becoming more viable in recent years. Edit for clarity: channel bandwidths in the datasheet are up to 2 GHz. Need to close the link at 32 QAM to hit 10 gb before error correction overhead at that bandwidth, which is certainly doable. Also, it's interesting to note…

terrestrial microwave engineer here: "80 GHz" is actually 71-86 GHz FDD. The original FCC band plan allowed for 5000 MHz wide channels each direction and basically OOK or BPSK level modulation. Newer radios use 250, 500 or 1000 MHZ wide FDD channels and QPSK or better. Incredibly wide channels can be used because it falls off in the atmosphere so rapidly after a few km, and the antennas are all very narrow parabolic reflectors with less than 1 degre beamwidth.

Basically no colocation interference issues are possible unless two companies try to shoot from the same rooftop, to also the same rooftop, using the same channel AND the same linear polarity.

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

#18
post #15

It's interesting to see the huge channel bandwidths they're using to attain this. Advances like this are largely driven by higher sample rate ADCs and DACs becoming more viable in recent years. Edit for clarity: channel bandwidths in the datasheet are up to 2 GHz. Need to close the link at 32 QAM to hit 10 gb before error correction overhead at that bandwidth, which is certainly doable. Also, it's interesting to note…

You can pack many bits into a constellation point. Think 1024 QAM.

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

#19
post #14

Earlier quoted context omitted.

If you've got line of sight then current (cheap) tech should do just fine. Sure not 10x gigabit but you can def get some decent internet...

Do you have any recommendations for current products for line of sight?

for what dollar figure, distance and speeds? anywhere from $300/link (a pair of ubiquiti powerbeam AC 5 GHz) up to $20,000 for 1 to 10GbE licensed.

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

#20
post #18
post #15

It's interesting to see the huge channel bandwidths they're using to attain this. Advances like this are largely driven by higher sample rate ADCs and DACs becoming more viable in recent years. Edit for clarity: channel bandwidths in the datasheet are up to 2 GHz. Need to close the link at 32 QAM to hit 10 gb before error correction overhead at that bandwidth, which is certainly doable. Also, it's interesting to note…

You can pack many bits into a constellation point. Think 1024 QAM.

Most new licensed band 6, 11, 18, 23 GHz radios these days are 1024QAM capable. For 80 GHz the hot new thing is radios capable of 16/64/256QAM at varying code rates.
Post reply on HN