Angles and routing of fiber optic cables
brupala Posted messages 111957 Registration date Status Membre Last intervention -
Hello,
I asked a technician from my internet provider to come extend my fiber at home to relocate the box, in order to route the box to the wall-mounted RJ45 connections to benefit from a wired Ethernet connection in all the rooms of my home.
The technician told me that the fiber optic cable routing I had planned could not be done due to the excessive number of right-angle turns in the walls.
I researched, and indeed I discovered the bending radius to respect in order not to lose signal efficiency.
My question is the following: if I run the fiber optic cable as I had initially planned, but by extending it around the corners to respect the bending angle, would the number of angles, say ten, have an impact on the quality of the received signal? Does the quality of the signal only depend on the bending radius or also on the number of angles?
Thank you for your feedback.
3 réponses
Hello,
I'm a bit surprised that we need to have 10 right-angle bends on a fiber for just a few meters indoors, but in any case, 10 bends that are respectful of the fiber, using G657A2 fiber, the most common for indoor use, results in an attenuation of 0.03 dB with a 15mm radius over 10 turns,
on a 360 the attenuation would be 0.5 dB with a harsh radius of 5mm:
http://wirerope.fr/bend-insensitive-optical-fiber-657a2/
If we consider that 10x360 is 40x90 (to check for the fiber, not for the math), you would be safe or even transparent in attenuation with 10 bends at 90° with a 2 cm radius using G657A2 fiber.
And there you go ....
But goodness, those line spacings are really annoying!!
Hi
Overflow in the corners?? It's also a question of sturdiness, it's very fragile if it's to break quickly, I understand why he doesn't want to do it.
If you make rounded edges in concrete to lay the cable with correct radii, it will follow the new wall with its wire.
If you leave the box that radiates Wi-Fi throughout the room, but you can only connect a single RJ45 from the output of the box, this single cable linked to an (distribution box powered by 230V) can then distribute RJ45 to the rest of the house in good quality. It's a workaround with the existing setup, okay.
Thank you for your response, so in summary, even with about ten angles conforming to the fiber, there are no issues with the quality of the signal?
No, there is attenuation, but very little with G657A2 fiber, certainly less than 0.1 dB.
It's not clever to use Wi-Fi repeaters when you have Ethernet wiring in the house, or you can use them with a mesh Wi-Fi system to create an Ethernet backhaul, a formidable tool, which leaves 1 or 2 Ethernet ports on each access point of the mesh.
Afterward, you might be talking about mesh Wi-Fi when you mention a repeater.
I think that in 2024, it's wiser to set up a Wi-Fi network independent of the provider of the box, also Ethernet, but that's more straightforward.
Unless you live in less than 50m² of course, where a single box will be more than sufficient.
Hello brupala,
I don't have Ethernet wiring in the apartment... and it's indeed Wi-Fi repeaters + the TV decoder for the living room and the bedrooms.
OK,
but we're not actually discussing your case.