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10mbps over 1km on a single pair of wires

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Re: 10mbps over 1km on a single pair of wires

#71

Post by nousermane »

Youden wrote: post #55
vicek22 wrote: post #43

- 1km of fiber optic cable - https://www.amazon.com/Jeirdus-Launch-Singlemode-Measuring-O... - 1Gb modem - https://www.amazon.com/TP-Link-Ethernet-Converter-Multi-Mode... The price for two modems and the cable is just under $120

You linked unterminated single-mode fiber and a dual-fiber multi-mode media converter, you can't actually use these together. You need something more like this: - Terminated single-mode fiber: https://www.fs.com/products/74355.html?attribute=255&id=3029... - 2x SFP transceivers: https://www.fs.com/products/75335.html - 2x media converters (or NICs): https://www.fs.com/products/96396.html The price is over $200.

Wouldn't cost of burying that cable be like 50x of that anyway?

Re: 10mbps over 1km on a single pair of wires

#72

Post by jacknews »

ginko wrote: post #24
jacknews wrote: post #19

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?

Cheaper cabling, at least in theory, but I'm not sure ethernet (for data) is the right comparison.

IMHO, in the near future, data-intensive connections will move to wifi 6/7/etc, or to fiber. Copper will be for providing data and power. IMHO, it makes more sense to compare SPE to current PoE networks/devices, powered wifi devices, CAN bus, rs485/modbus, and other wired IoT and industrial networks.

Re: 10mbps over 1km on a single pair of wires

#73

Post by MrBuddyCasino »

RicoElectrico wrote: post #8
hericium wrote: post #5

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?

It used to be possible many years ago, when I had a DSL modem as PCI card. There was a windows software that would put it in "server mode", and then you could connect another DSL modem to it and "dial in". Not sure if this is possible anymore, but there are Ethernet repeaters that are based on DSL tech which should work in a similar way.

Re: 10mbps over 1km on a single pair of wires

#75

Post by transistor-man »

Awesome project!

This would be fairly great fit for underwater UAV's, or like security camera way out on the edge of property. May be a good idea to post on ardu-sub related discussion forums. I'm not aware of an off the shelf module that's point to point ADSL, almost every modem is intended to yell at a ADSL / ADSL2+ host.

Did you run into any issues with consumer-grade gigabit switches negotiating 10Mbit?

Re: 10mbps over 1km on a single pair of wires

#77

Post by 0xfaded »

transistor-man wrote: post #75

Awesome project! This would be fairly great fit for underwater UAV's, or like security camera way out on the edge of property. May be a good idea to post on ardu-sub related discussion forums. I'm not aware of an off the shelf module that's point to point ADSL, almost every modem is intended to yell at a ADSL / ADSL2+ host. Did you run into any issues with consumer-grade gigabit switches negotiating 10Mbit?

Blue Robotics sells the fathomX exactly for this purpose. I wouldn't be surprised if it uses the same chip set.

https://bluerobotics.com/store/comm-control-power/tether-int...

Re: 10mbps over 1km on a single pair of wires

#79

Post by rkangel »

silviot wrote: post #21
yetihehe wrote: post #7

Earlier quoted context omitted.

> Any application requiring a simple, low cost, robust connection between physically disparate devices At $195 it's definitely not low cost.

What's the difference in price between 1km of fiber vs 1km or single pair wire? It might play a role in this solution being cheaper than immediately apparent.

It comes down to whether the cable is there already. If you were laying it, you'd probably go for fibre. But if you've got 1km of some poor quality cable there already, then spending $200 to get usable bandwidth might be a lot cheaper than laying something new.

Re: 10mbps over 1km on a single pair of wires

#80

Post by transistor-man »

transistor-man wrote: post #75

Awesome project! This would be fairly great fit for underwater UAV's, or like security camera way out on the edge of property. May be a good idea to post on ardu-sub related discussion forums. I'm not aware of an off the shelf module that's point to point ADSL, almost every modem is intended to yell at a ADSL / ADSL2+ host. Did you run into any issues with consumer-grade gigabit switches negotiating 10Mbit?

Any chance you're going to release schematics / open source the design?
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