yosheli123

That tops out at around 300meters. Ours goes beyond 1km. Still there's is awesome for camera feeds; I love the Blue Robotics hardware, SPEBlox Long is just a different application (more industrial automation focussed)

Awesome to have your input on this. I'd love to talk to you in person to learn more. Reach out at [email protected]

Yeah, I think there's other considerations like power, overall size, input voltage supply, ease of maintenance etc.

If it's purely down to cost then I don't these modules would compete

That's brilliant!

Smaller, lower power, more reliable + a somewhat open spec being developed around it (unlike things like homeplug which are kinda murky). Generally it's the same people who developed the ethernet spec that are developing single pair ethernet, so it's designed to play nicely with it.

tbh I don't think I'm really ever going to compete with the mass volume stuff on DSL. I think this is more for applications where space is the key motivator, rather than cost.

Yeah I'm really targeting directly embedded applications that will want single pair ethernet. Robot tethers and things like that.

$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.

Yeah fair. I'm aiming at new space constrained applications with this.

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).

Yeah approx $400 for a pair. Mainly chip shortage messiness, I think I can get the cost down to less than $200 a pair in April 2023.

Regarding VSDL, never used it myself; I guess it would come down to space/power considerations. I haven't seen VDSL used much in the industrial automation, single pair ethernet seems to be the preferred choice.

Yep full duplex

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

One point I completely forgot was Gigabit Home Network, (G.hn) as a alternative to 1000BASE-T1. It essentially does the same thing and can achieve long ranges. Ultimately this technology is designed to pump 1000Mbps down nasty home wiring, so using it on a single pair of wires is probably going to result in a very good range.

The encoding scheme here is OFDM, aka, break the signal down into multiple signals at different frequencies, and send it down the wire.

It's more robust than SPE, but it requires more costly and larger ICs than SPE. When you can define a connector and cable, SPE is still better in terms of cost and size I believe.

G.hn could have its uses in retrofitting older wiring systems.