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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

#111

Post by madaxe_again »

midasuni wrote: post #89
cm2187 wrote: post #87

Earlier quoted context omitted.

Fiber doesn’t conduct electricity, a wire does. I remember reading somewhere to be careful with running a wire over any long distance between two houses that are not connected to the grid with the same meter. Something to do with phase or different potential, can’t remember, but the point was it could fry your equipment. Fiber sounds a lot safer to me.

The biggest problem is lightning strikes hitting the cable. The phase wouldn’t matter - and even different earthing wouldn’t matter as long as you only connect any shield at one end. But fibre is so much more versatile if you’re running new cables (unless you want to run power)

Then you just install a lightning arrestor on your comms circuit - I have a mast way up the hill to provide our connectivity here, and use one on the Ethernet line down to prevent issues (like a house fire) from a strike.

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

#112

Post by Zenst »

inetknght wrote: post #60
Zenst wrote: post #51

Earlier quoted context omitted.

1KM of fiber cable for $60 seems crazy cheap when you contrast it with 3D printer filement. More so as I'd of thought the former be more expensive to manufacture.

Fiber is generally laid just once. But the filament is a recurring cost to consumers so it provides more value to businesses ... and therefore more opportunity for a higher demand and higher price.

Does seem very much that the whole 3D filement market just needs one disruptive supplier. Which often happens when you have high-margin consumables markets. Which with the ink printer market saw makes of the printers introduce DRM into the consumables - something I don't see happing with 3D filement though, so could be interesting.

That all said, I see that there are products that can convert your plastic bottles into 3D printer filement - https://3devo.wpmudev.host/filament-makers/

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

#113

Post by dboreham »

madaxe_again wrote: post #111
midasuni wrote: post #89

Earlier quoted context omitted.

The biggest problem is lightning strikes hitting the cable. The phase wouldn’t matter - and even different earthing wouldn’t matter as long as you only connect any shield at one end. But fibre is so much more versatile if you’re running new cables (unless you want to run power)

Then you just install a lightning arrestor on your comms circuit - I have a mast way up the hill to provide our connectivity here, and use one on the Ethernet line down to prevent issues (like a house fire) from a strike.

There's really no "just" concerning lightning protection. You can just add some protection, to code or above, but it may not work. Nature can be unforgiving.

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

#114

Post by terom »

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

A 1km reel of unsheathed 9/125um single fiber strand would last maybe about one minute during installation before it snapped.

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

#115

Post by NegativeLatency »

hervature wrote: post #104
kombre wrote: post #101

Earlier quoted context omitted.

>oh, fiber materials may be sand what does sand means in this context please ?

Fiber optics cables are made of glass whose primary constituent is silicon dioxide and/or quartz which are the primary constituents of sand.

And therefore should be cheap in a naive estimate

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

#116

Post by NegativeLatency »

quickthrower2 wrote: post #28
ginko wrote: post #24

Earlier quoted context omitted.

What's the advantage of SPE compared to regular ethernet? That it's cheaper?

Well my house has electricity sockets but no ethernet sockets, so it would be less expensive than getting those installed. If I could stomach sub-wifi speeds.

You can do your own Ethernet, it’s especially easy if you’re just running a wire or two for an extra AP or something with premade cables

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

#117

Post by chriscjcj »

yosheli123 wrote: post #2

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

Definitely cheaper than StarTech's offering. That's appealing.

https://www.startech.com/en-us/networking-io/110vdslext

However, with StarTech's product, you have a shot at faster speeds if you're going a shorter distance. It can do 75 Mb/s at 300 meters and up to 100 Mb/s at shorter distances.

I would really like to find a similar box that can bond multiple pairs for faster speeds but I haven't found such a device yet.

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

#118

Post by tyingq »

chriscjcj wrote: post #117
yosheli123 wrote: post #2

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

Definitely cheaper than StarTech's offering. That's appealing. https://www.startech.com/en-us/networking-io/110vdslext However, with StarTech's product, you have a shot at faster speeds if you're going a shorter distance. It can do 75 Mb/s at 300 meters and up to 100 Mb/s at shorter distances. I would really like to find a similar box that can bond multiple pairs for faster speeds but I haven't found such a device ye…

>Definitely cheaper than StarTech's offering

There are other brands of VDSL extenders. This board seems to be $300 for a pair.

This product, for example, is ~$271 a pair if you buy them at the same time: https://www.netsys-direct.com/products/vdsl2-ethernet-bridge...

And they come with an enclosure and power supply. And a better sort of "step up / step down" bandwidth based on distance...see the chart at the bottom.

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

#119

Post by snickmy »

xhrpost wrote: post #61
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

Nitpick, I don't think you're going to just run bare fiber outdoors, not even indoors. You would need to first run your own ducting/conduit and then have the equipment to pressure force the raw line through the shielding. So, much more expensive. But you can get outdoor rated cable with moisture absorbing gel for not too much I believe (struggling to find a price). Some even come with wire-mesh already attached in th…

what does 'pressure force the raw line through the shielding' means ?

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

#120

Post by iforgotpassword »

crazyjncsu wrote: post #16
RicoElectrico wrote: post #8

Earlier quoted context omitted.

Wait, can DSL modems talk to each other instead of a DSLAM line card?

Not a traditional dsl modem, but these work well using dsl technology: https://www.amazon.com/Tupavco-Ethernet-Extender-Kit-Repeate...

According to the description this adds at least 660ms of latency, so might be useless for certain applications. Wonder how much the TFA solution adds.
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