[SOLVED] Trying to wrap my head around ONUs (fiber optic internet hardware)

fireaza

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May 9, 2011
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I live in Japan and I have fiber optic internet. I'm thinking I'd like to replace the hardware my ISP gave me, however unlike ASDL, you can't just jump on Amazon to order a modem/router of your choice if you don't like the one your ISP provides, since there's no where to plug the fiber cable in! So this is what my setup looks like at the moment. The fiber cable coming from the wall is plugged into my ISP's box-thing (they call it an "ONU") like this'
9her42f.jpg

From there, I have a ethernet cable going from my ONU to my router.

However this setup still requires me to use my ISP's hardware, and I also suspect that this might be hampering my internet speed. My ISP says I have a 2 gigabit connection, but from what I can see, my ONU only has a 1 gigabit ethernet connection. When I run an online speedtest, it always seems to consistently max out at 947mbps, I think it's really odd I'm always getting that exact number, so I'm thinking that the issue isn't my ISP, but my hardware. That's why I think if I were to replace my ISP's ONU with one that supports 10gigabit or 2.5gigabit, I might see an improvement in speed.

The issue is, I really don't know a lot about fiber optic network hardware. I've had a look around on Amazon, it seems like what I might need is a "optical line media converter". These seem to be for converting from a fiber connection to RJ45 ethernet. From what I can see, the majority of them have a double connector ("single mode" and "multi mode" I think they're called..?) but my ONU only has one plug, so do I just use one of the plugs and ignore the other..? From what I've been able to work out, I'm using an "SC" connector, it looks like this:
TMRwJOA.jpg


The other issue is all the optical media converters I've seen only support 10/100/1000 ethernet speeds, do they not make anything faster than gigabit?

So, is there anyone who can help me untangle this?
 
Solution
There are many different ways to deliver internet on fiber so it is impossible to say without the model number of the ONU and even then you may need to know the model of a optical adapter. In most cases they are using something called GPON and not simple ethernet fiber optic devices. Although your connection might have 2 fiber stands in it the more common method is to use a single fiber and run multiple color lasers for different channels. That photo looks like a single fiber strand which makes it even more unlikely it is simple ethernet fiber optics.

Unless the ISP gives you a ethernet port that can run above 1gbit they really should not call the connection more than 1gbit. Then again it depends on what you mean. On...
There are many different ways to deliver internet on fiber so it is impossible to say without the model number of the ONU and even then you may need to know the model of a optical adapter. In most cases they are using something called GPON and not simple ethernet fiber optic devices. Although your connection might have 2 fiber stands in it the more common method is to use a single fiber and run multiple color lasers for different channels. That photo looks like a single fiber strand which makes it even more unlikely it is simple ethernet fiber optics.

Unless the ISP gives you a ethernet port that can run above 1gbit they really should not call the connection more than 1gbit. Then again it depends on what you mean. On wifi for example they add transmit and receive speed together. On a ethernet cable that means it runs at 2gbit but a ethernet cable can actually run 1gbit up and 1gbit down at the same time. If a gpon system can do that depends on how they implemented. it.

In any case how much effort do you really want to spend on something that is just a number. It really only matters for very large file downloads. Even then it make very little difference to say go from 500mbps to 1gbit. Things like steam may go from downloading in 5 minutes rather than 10 minutes but it will still then take another 20 minutes do installing and all the other crap it does that takes much longer than the download itself.

You should never be able to even come close to using 1gbit. You would need 50 people watching 4k movies on netflix at the same time in your house to use 1gbit.
 
Solution