Does bending GPON cable affect internet speed?

Question

Computer networks

People, tell me:

A strong wind was blowing, the tree fell along with the fiber optic cable.
When I pulled the cable, I noticed a strong bend.
Now the Internet is slowing down, I can’t understand the reason, either the cable or the provider (there is a storm in the area).

The question is, can the fiber optic cable (gPON) that is connected to this thing be bent and to what limits?

UPD: I straightened the cable at the bend, the feeling that the Internet works better ...

img cable with bend

img cable straight

Answer 1

Not!
Theoretically, each bend is an extra reflection - the signal path is lengthened, therefore it arrives later.
In practice, these are very meager values, not noticeable against the background of others, and not exceeding the statistical error.
It should be remembered that there is glass inside the cable, and it tends to break when strongly bent. If you break it, the connection will be lost.

Answer 2

Yes.

The minimum allowable bending radius depends on the specific cable.
If you bend too hard, the cable will break.

Answer 3

These are too different levels to be precise. An optical fiber cable is not a pipe that, when pinched, reduces the flow rate. When bending, part of the laser radiation is lost. As a result, the signal becomes too weak to operate at the mains frequency. Only unlike radio networks or xDSL, xPON cannot dynamically change the frequency. Operation with insufficient signal strength leads to errors in receiving data, which at the TCP / IP level leads to packet loss (or transmission errors). If you try to ping say ya.ru using a packet size of 1400, you will notice an unacceptable level of loss. But if there was a light flux with at least some margin before you, then there would be no transmission errors. In particular, the provider's equipment sees the signal from your laser without errors. In any case, this cable is not yours and this is the provider's problem.

Answer 4

From personal experience, in 8 years it was only 2 times that it coincided and the fiber did not break, there was a very strong attenuation, the speed sank to 1 Mbit / s and did not come again. Mostly due to the large attenuation, it does not work at all.
In general, gpon is guaranteed to give 2.5 Gb / s to the last, for example, attenuation on modules, fiber, on the head allows you to work up to -30.9
Then already at -31 simple, it will stop working.
Full speed will be up to the last.

Answer 5

Packet loss guaranteed.

Answer 6

Bending the cable can reduce the level of the optical signal, and if it reaches a critically low level, then this can cause packet loss and, as a result, a decrease in speed, but this is not a direct relationship - usually if the signal is sufficient, then the Internet works, and if it is too low, then the connection falls off at all.