21–30 of 225 posts
So I built a tiny single pair Ethernet bridge (10BASE-T1L) that can transmit 10mbps over a kilometer on a single pair of twisted copper wires. Would love to get some feedback for the next iteration
> Any application requiring a simple, low cost, robust connection between physically disparate devices At $195 it's definitely not low cost.
In the US, you will be able to get these cheaper than the product on Botblox and with better performance (both products require a pair). "20/12Mbps over a long distance of 1.4km"
The author might be more competitive when he managers to go $100/pair (which he mentioned in another post he plans to by Apr 2023).
SPE (Single-Pair Ethernet) is going to be a big deal, IMHO, and I would view this as a 'development board' for learning, though perhaps it also makes economic sense as an actual solution in some situations. The other killer feature of SPE (apart from in-theory cheaper cabling) is PoDL (Power over data line). Does this board do that?
DSLs were capable of at least 8Mbit/s speeds close to 20 years ago. I worked for a small ISP and where were more than 100 meters (theoretical limit for cat5) between residential buildings, we were setting up 8 modems on a single UTP cable. With home internet speeds back then it wasn't a bottleneck.
Wait, can DSL modems talk to each other instead of a DSLAM line card?
Something like this is what this is competing with; https://www.ebay.co.uk/itm/314029740243 In the US, you will be able to get these cheaper than the product on Botblox and with better performance (both products require a pair). "20/12Mbps over a long distance of 1.4km" The author might be more competitive when he managers to go $100/pair (which he mentioned in another post he plans to by Apr 2023).
DSLs were capable of at least 8Mbit/s speeds close to 20 years ago. I worked for a small ISP and where were more than 100 meters (theoretical limit for cat5) between residential buildings, we were setting up 8 modems on a single UTP cable. With home internet speeds back then it wasn't a bottleneck.
SPE (Single-Pair Ethernet) is going to be a big deal, IMHO, and I would view this as a 'development board' for learning, though perhaps it also makes economic sense as an actual solution in some situations. The other killer feature of SPE (apart from in-theory cheaper cabling) is PoDL (Power over data line). Does this board do that?
What's the advantage of SPE compared to regular ethernet? That it's cheaper?
It seems that single mode fiber is king for long distance cable runs now, nevermind that it can push gigabits. What kind of cable would this be and is it actually much cheaper? My impression is that most cost of cabling now is the labor to run it as opposed to the medium, but I'm a neophyte for sure.
Basically just any CAT5e like twisted pair has worked for me up to 1km. 26AWG unshielded twisted pair basically, 100Ohm diff impedance. Cost of cabling is pennies IMO. Labor cost, who knows. Optical can be quite expensive though these boards aren't exactly cheap (yet).
But here's sort of an example of what I'm talking about.
https://www.amazon.com/Gigabit-Ethernet-Converter-1000Base-L...
So the cost is pretty low if you wanted to terminate with these (these things aren't too loved in networking circles, but I can vouch that they do work), then the biggest difference is the cost of bulk cable - fiber vs copper. I assume the cost of labor to run it is essentially the same.
The main tradeoffs I see are that you can run power over catX cable (though probably not 1km?) but single mode fiber seems to be indefinitely able to upgrade bandwidth; I'm told that old installations from the 90's are still used and are pushing 100's of gigabits with newer optics attached to them.
Like I said, I'm fairly new to this having started a job where I have to talk to datacenter people about this sort of thing, so I'm learning a bit as I go.
Something like this is what this is competing with; https://www.ebay.co.uk/itm/314029740243 In the US, you will be able to get these cheaper than the product on Botblox and with better performance (both products require a pair). "20/12Mbps over a long distance of 1.4km" The author might be more competitive when he managers to go $100/pair (which he mentioned in another post he plans to by Apr 2023).
$200 a pair is definitely possible. $100 a pair is probably possible in a year or so, I just can't place orders for the chips in bulk because of the chip shortage so everything is inflated.