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llee040's profile

Mentor

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110 Messages

Wednesday, June 28th, 2017 6:23 PM

Where can I find a diagram showing components of fiber network?

I requested fiber service when I discovered it was available. I asked about it after an AT&T U-verse Field Ops tech knocked on my door a few days ago to ask for access to our yard to help install for someone else in the neighborhood (I thought our account settings limited information AT&T can share with others, but apparently it limits what AT&T can share with us instead). It seemed logical to me that the infrastructure was already functional, especially due to the fact that I found out about it the way I did.  However, our installation tech had to bring in an engineer because of deficient optical signal before performing any installation steps at all, and the engineer had to call in a dig crew (which hasn't started work yet), so I'm assuming they pretty much have to start from scratch on the infrastructure from the last stage (GPON?) at least. I'm referring to the rectangular surface mount plate on the ground in our neighbors' yard as the GPON. Is that correct, or is that the node? Is there a diagram available online that I can refer to for an explanation of the various components? Our installation tech mentioned installing a electrical appliance box called ONC (if I remember correctly) inside the home from which copper will be fed back outside to run to the gateway drop. Apparently being the guinea pig for our nearest shared optical distribution point, I'd like to learn a little more about the system. Thanks.

New Member

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7 Messages

3 years ago

Thank you very much for the explanation @my thoughts - https://forums.att.com/users/5defad9cf6e8ee15674cec97

 

Just to be clear. Is the ground enclosure photo i posted above (AT&T newbasis - T15/ 20K) is a fiber splice terminal (FST) right? and not a PFP.

So essentially there is no conversion that happens till it reaches the ONT device. Am i getting this right?

 

 

ACE - Professor

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5.6K Messages

3 years ago

Fiber to copper conversion occurs inside the home at the ONT. 

Scholar

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3.7K Messages

3 years ago

Might be a FST but it is really just a ground enclosure without looking inside. It might contain a Corning Brand Optical tap (see picture above for @my thoughts) with 4 weather proof drop connections to service nearby houses.

 

In our area the Optical tap is found in a small green box (ped) buried in the ground between every 2 houses. The gray boxes are larger and are normally found at the corners of the main road and neighboring streets.

 

It could also be a junction point where Fiber service cables from a PFP split to serve different streets. At this point it would also still be passive Fiber.

 

A PFP (Primary Flexibility Point) is typically an above ground cabinet with 2 doors where the primary fiber bundles come from the CO (Central Office). The PFP could be ground mounted or even on a pole in areas with aerial service.

 

Yes you are also correct that there is no conversion until the fiber is terminated in the ONT. That is where light signals are converted. The ONT could be on the side of your house or inside.

 

Dave

New Member

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7 Messages

3 years ago

Thank you, @my thoughts , @browndk26 and @dave006.

 

@dave006,

It looks more of Fiber service cables from a PFP split. But it could be the Corning Brand Optical tap as the enclosure size is not big enough.

 

I don't find this enclosure in front of every other home site. Rather every 6 or 8  homes. Sometimes there is a street light pole in front. Not sure of the Significance or just coincidence.

 

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