41–50 of 94 posts
Earlier quoted context omitted.
>higher sample rate ADCs and DACs becoming more viable Question, on optical networks doesn't this make dispersion more of a problem?
80 GHz isn't quite optical yet. It's a couple octaves down from infrared. SFAIK, it's still very much radio.
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.
a great deal lower, the optical ITU DWDM grid is around 191.7 THz to 196.1 THz
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 :-)
This Ubiquiti setup is $999 per side: https://www.ubnt.com/airfiber/airfiber5/
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 :-)
There are solutions that are lower end than this one, but still gigabit, at relatively affordable prices. This Ubiquiti setup is $999 per side: https://www.ubnt.com/airfiber/airfiber5/
Earlier quoted context omitted.
a great deal lower, the optical ITU DWDM grid is around 191.7 THz to 196.1 THz
The more general dividing line between microwave and infrared ( outside comms ) is 300 GHz, which was what I meant.
It's so incredibly tiny and narrow compared to a 11 or 18 GHz microwave waveguide. Then imagine continuing to make it narrower while increasing the frequency, follow that to its logical conclusion and you have imagined a 9/125 fiber.
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 :-)
Earlier quoted context omitted.
There are solutions that are lower end than this one, but still gigabit, at relatively affordable prices. This Ubiquiti setup is $999 per side: https://www.ubnt.com/airfiber/airfiber5/
An AF5 or AF5X PTP link isn't a transparent 1Gb full duplex bridge, realistically you'll achieve 250-400 Mbps max. They're great radios but physics is still physics, 40 or 80 MHz wide dual polarity channel at 256QAM 5/6 code rate is not 1GbE.
Also curious...they show 5470-5950 MHz...from my layperson standpoint, that seems to allow for more than 80MHz wide. What's the actual story? The UBNT forums seems to indicate 2 separate 50Mhz channels, one for TX...one for RX.
Earlier quoted context omitted.
a great deal lower, the optical ITU DWDM grid is around 191.7 THz to 196.1 THz
The more general dividing line between microwave and infrared ( outside comms ) is 300 GHz, which was what I meant.
Interesting that mmWavguide is still rectangular. Wonder if one could do a mmWave fiber? Don't see why not.
Earlier quoted context omitted.
An AF5 or AF5X PTP link isn't a transparent 1Gb full duplex bridge, realistically you'll achieve 250-400 Mbps max. They're great radios but physics is still physics, 40 or 80 MHz wide dual polarity channel at 256QAM 5/6 code rate is not 1GbE.
Given the context that the parent was saying "I'd seen the 5mbps ones but nothing close to a gigabit" , and was talking about a non-commercial setup, it still seems relevant. Also curious...they show 5470-5950 MHz...from my layperson standpoint, that seems to allow for more than 80MHz wide. What's the actual story? The UBNT forums seems to indicate 2 separate 50Mhz channels, one for TX...one for RX.
But the size of the channels it can operate in are 5, 10, 15, 20, 30, 40, 60 or 80 MHz wide. Software configurable on the radio.
Earlier quoted context omitted.
The more general dividing line between microwave and infrared ( outside comms ) is 300 GHz, which was what I meant.
Back in 60's AT&T make lots and lots of circular waveguide, intending to bury it across the country. One of the circular modes is dispersionless; then fiber was invented; lot's of money lost on circular waveguide. Interesting that mmWavguide is still rectangular. Wonder if one could do a mmWave fiber? Don't see why not.