4 ms·

10BASE-T1L allows Ethernet over a single pair of cables at 1000m: * https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair#Single-pair https://en.wikipedia.o

10BASE-T1L allows Ethernet over a single pair of cables at 1000m: * https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair#Single-pair https://en.wikipedia.org/wiki/Ethernet_over_twisted_pair#Sin...

samwillis 5y ago
Even more incredible, ADSL works over wet string: https://www.revk.uk/2017/12/its-official-adsl-works-over-wet-string.html?m=1 https://www.revk.uk/2017/12/its-official-adsl-works-over-wet...
- gruez 5y ago
  Is it really surprising that ADSL2, which was apparently designed to work "up to 5000 meters" of copper, can work over 2 meters of wet string? Wet salty string being 1/2500th as conductive as copper wire doesn't seem too far fetched.
  - rubatuga 5y ago
    You need to consider reflections attenuation and imepdance
    - deleted 5y ago
      [deleted]
- Nextgrid 5y ago
  A large chunk of the UK wouldn't have broadband if it didn't.
voakbasda 5y ago
This is exactly what I have been looking to find for connecting a camera at my front gate to my house, which are over 1/4 mile away from each other.
- simonjgreen 5y ago
  If you've got power out there then fibre is a much better solution
  - mellavora 5y ago
    <weak attempt at humor> Yes, fiber has many advantages over barbed wire <sorry, leaving now>
  - throw0101a 5y ago
    Single-pair wire can deliver power in addition to 10Mbps: * https://en.wikipedia.org/wiki/Power_over_Ethernet#PoDL https://en.wikipedia.org/wiki/Power_over_Ethernet#PoDL * https://blog.siemon.com/standards/ieee-p802-3cg-10-mbs-single-twisted-pair-ethernet-task-force https://blog.siemon.com/standards/ieee-p802-3cg-10-mbs-singl... Not sure what kind of distance-dropoff trade-off there is.
toast0 5y ago
Anything commercially available?
- throw0101a 5y ago
  Generally focused in the industrial space: * https://e2e.ti.com/blogs_/b/analogwire/posts/how-10base-t1lsingle-pair-ethernet-phys-help-bring-more-data-farther-in-long-distance-applications https://e2e.ti.com/blogs_/b/analogwire/posts/how-10base-t1ls... * https://www.altronix.com/products/Pace1KL https://www.altronix.com/products/Pace1KL
  - toast0 5y ago
    On the first one, yeah, TI's got chips (so do a few other vendors), but I'm not competent at designing (or building) ethernet circuits, so I need someone else to put a 10Base-T1L PHY back to back with a 10Base-T PHY, and do those other things. Pace1KL looks interesting, but the price (seems to be $129 each) is too high for me, especially since I'd need to supply PoE on both sides. In an ideal world, I'd get one unit which was powered and was a PSE (power sourcing equipment), and the other unit was a PD (powered device), so I didn't need to find a safe place to tap power where my line ends. Of course, in an even more ideal world, I'd have two pairs so I could run standard ethernet :)
    - throw0101a 5y ago
      Single-pair wire can deliver power in addition to 10Mbps: * https://en.wikipedia.org/wiki/Power_over_Ethernet#PoDL https://en.wikipedia.org/wiki/Power_over_Ethernet#PoDL * https://blog.siemon.com/standards/ieee-p802-3cg-10-mbs-single-twisted-pair-ethernet-task-force https://blog.siemon.com/standards/ieee-p802-3cg-10-mbs-singl... Not sure what kind of distance-dropoff trade-off there is: > For example, at 55V and 1000m, 7.7W can be delivered to the endpoint. At shorter distances, 55V and 150m, 52W can be delivered to the endpoint. * https://ethernetalliance.org/wp-content/uploads/2021/07/EA_TechBrief-SPE-SPoE_FINAL.pdf https://ethernetalliance.org/wp-content/uploads/2021/07/EA_T... Eval board here: * https://www.analog.com/en/products/adin1100.html#product-evaluationkit https://www.analog.com/en/products/adin1100.html#product-eva... All of this is meant for bulk purchases in the industrial/embedded/automation/SCADA space, so small-batch hobbyist purchases may be expensive.

samwillis 5y ago

Even more incredible, ADSL works over wet string: https://www.revk.uk/2017/12/its-official-adsl-works-over-wet-string.html?m=1 https://www.revk.uk/2017/12/its-official-adsl-works-over-wet...

gruez 5y ago
Is it really surprising that ADSL2, which was apparently designed to work "up to 5000 meters" of copper, can work over 2 meters of wet string? Wet salty string being 1/2500th as conductive as copper wire doesn't seem too far fetched.
- rubatuga 5y ago
  You need to consider reflections attenuation and imepdance
  - deleted 5y ago
    [deleted]
Nextgrid 5y ago
A large chunk of the UK wouldn't have broadband if it didn't.

voakbasda 5y ago

This is exactly what I have been looking to find for connecting a camera at my front gate to my house, which are over 1/4 mile away from each other.

simonjgreen 5y ago
If you've got power out there then fibre is a much better solution
- mellavora 5y ago
  <weak attempt at humor> Yes, fiber has many advantages over barbed wire <sorry, leaving now>
- throw0101a 5y ago
  Single-pair wire can deliver power in addition to 10Mbps: * https://en.wikipedia.org/wiki/Power_over_Ethernet#PoDL https://en.wikipedia.org/wiki/Power_over_Ethernet#PoDL * https://blog.siemon.com/standards/ieee-p802-3cg-10-mbs-single-twisted-pair-ethernet-task-force https://blog.siemon.com/standards/ieee-p802-3cg-10-mbs-singl... Not sure what kind of distance-dropoff trade-off there is.

toast0 5y ago

Anything commercially available?

throw0101a 5y ago
Generally focused in the industrial space: * https://e2e.ti.com/blogs_/b/analogwire/posts/how-10base-t1lsingle-pair-ethernet-phys-help-bring-more-data-farther-in-long-distance-applications https://e2e.ti.com/blogs_/b/analogwire/posts/how-10base-t1ls... * https://www.altronix.com/products/Pace1KL https://www.altronix.com/products/Pace1KL
- toast0 5y ago
  On the first one, yeah, TI's got chips (so do a few other vendors), but I'm not competent at designing (or building) ethernet circuits, so I need someone else to put a 10Base-T1L PHY back to back with a 10Base-T PHY, and do those other things. Pace1KL looks interesting, but the price (seems to be $129 each) is too high for me, especially since I'd need to supply PoE on both sides. In an ideal world, I'd get one unit which was powered and was a PSE (power sourcing equipment), and the other unit was a PD (powered device), so I didn't need to find a safe place to tap power where my line ends. Of course, in an even more ideal world, I'd have two pairs so I could run standard ethernet :)
  - throw0101a 5y ago
    Single-pair wire can deliver power in addition to 10Mbps: * https://en.wikipedia.org/wiki/Power_over_Ethernet#PoDL https://en.wikipedia.org/wiki/Power_over_Ethernet#PoDL * https://blog.siemon.com/standards/ieee-p802-3cg-10-mbs-single-twisted-pair-ethernet-task-force https://blog.siemon.com/standards/ieee-p802-3cg-10-mbs-singl... Not sure what kind of distance-dropoff trade-off there is: > For example, at 55V and 1000m, 7.7W can be delivered to the endpoint. At shorter distances, 55V and 150m, 52W can be delivered to the endpoint. * https://ethernetalliance.org/wp-content/uploads/2021/07/EA_TechBrief-SPE-SPoE_FINAL.pdf https://ethernetalliance.org/wp-content/uploads/2021/07/EA_T... Eval board here: * https://www.analog.com/en/products/adin1100.html#product-evaluationkit https://www.analog.com/en/products/adin1100.html#product-eva... All of this is meant for bulk purchases in the industrial/embedded/automation/SCADA space, so small-batch hobbyist purchases may be expensive.