Fiber Optic Distance

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akm1156

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Sep 18, 2013
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I was wondering does anyone know what is the maximum distance a 16 pair fiber cable can carry a signal and at whats speeds?

My ISP ran a CAT5e to my house but due to the length from the node, I was unable to connect. Now they are offering to put in a fiber directly from their servers to my house and skip all the nodes. I think they are roughly about 1-1.5 km (0.65-1 mile) away.
 
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akm1156

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Sep 18, 2013
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Great... my ISP is definitely less than 2kms away...
Thanx
 
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ImPain

ImPain

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The answer to this question is not so easy, since many factors affect fiber optics for the distance and speed of transfer:

1. there are two different types of fiber optic :

- Monomode (long distances, up to like 40-80km)
- Multimode (shorter distances)

2. For each of these types of fiber, they can have different core size which also affect the max distance to transmit signals.

3. The maximum distance of a fiber optic to carry a signal is also linked to the type of connector used at the edges of the fiber (from their servers to your plug), since these connectors send/receive data differently..

4. Regarding the speed, fibers can easily send several Gb, more than 40Gb (but speed is also affected by connectors and affects the distance).

So as you can see, all these factors affect the max distance

In your case, the distance is very short so there is no problem your ISP probably knows what to put so that you receive the signal properly.. it will be a MMF (MultiMode Fiber) with standard connectors.

You should be just fine!
 
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bill001g

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Aug 9, 2012
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ImPain is mostly correct. You really can't answer this without first getting answers to other questions.

I seriously doubt they are using multimode fiber. The common distance limit for it is 550m there is some that will go 1km but that is very expensive and is limited to 1g at that distance it mostly used to carry 10g to the 550m limit.

Single mode fiber can go 10km with standard lx optics at 1g. It can go much farther using zx type optics many times up to 70km.

I am surprised they are offering that . The costs of the fiber itself is only a tiny fraction it is the costs to put in in the ground that makes is unaffordable for any but the largest companies.

 
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Kewlx25

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If you got the money, you can get 8tb/s over a single pair of fiber over 600km with no repeaters or regenerators. But like other's said, singlemode with get your about 40km with current 1gb or 10gb nics and about 2km with multi-mode for those same speeds.
 
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akm1156

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Sep 18, 2013
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I dunno what fiber they used but they did it yesterday.... they ran the fiber over building tops and pulled it... luckily one is allowed to do that here.. took them like an hour or two to do the job... dunno if its the fiber but im getting 0ms pings on speedtest.net which was not the case earlier...
 
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akm1156

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Sep 18, 2013
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As of now I am directly connected to my ISP... no repeaters and the distance is definitely lesser than 2 kms... I am yet to test the speed but I highly doubt anything over 50mbps because I know the hardware at my ISPs end is slow...

They only reason they use fiber is to cover longer distances and provide cable tv along with internet..
 
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