The Approach We Chose for Subscriber Connections

As part of our GPON subscriber deployment project, we specifically purchased an Ilsintech Swift F1 fusion splicer. The network rollout plan called for 100% coverage of the residential area, with all cable lines fully pre‑terminated for subscriber connections. To achieve this, we installed splitters inside the distribution enclosures, or terminated the fibers with SC/APC connectors and mounted optical outlets. The installation crew would only need to run a drop cable from the subscriber's premises to the pole where the optical box is mounted, terminate both ends, and connect it to the network and the ONT — or simply use a pre‑made patch cord.

However, if the subscriber enclosure doesn't allow a pre‑connectorized cable to be fed in, the drop usually has to be pulled through drilled holes, along beams in attics, tucked into baseboards, and so on. During all this handling, there's a real risk of damaging the connector — which would undo all the effort. Of course, you can use factory‑made cables with protective caps and built‑in pulling loops, but these solutions are still quite expensive.

There are also field‑installable connectors available, where the fiber is mechanically spliced inside the connector body. All you need is a stripper and a cleaver. In practice, though, achieving acceptable loss levels with these connectors is tricky — you need a microscope to inspect the cleave quality, and the loss can drift over time. I've even seen cases where the fiber broke completely, taking the link down. You also have to qualify the connection from both ends — install one connector, test it, send a signal down the line, install the second connector, and check the signal level again. If the loss is too high, you have to re‑terminate one of the connectors — and if that doesn't fix it, the other one too. To do this efficiently, you need two technicians on site, each with a full termination kit. And worst of all, you lose time troubleshooting and get that nagging feeling of doing unnecessary work — which is just unpleasant.

With Ilsintech's splice‑on connectors, we're expecting better quality splices because we can actually see the splice quality during the process and check the splicer's loss estimate. There's still a chance of a bad splice or mechanical damage when plugging the connector in, but the odds are much lower.

I'll write a separate post about the connectors and the splicer itself soon — because things turned out to be not quite as rosy as the reviews and sales reps made them sound. Every time, I'm reminded that there's no substitute for hands‑on experience — though sometimes it comes at a pretty steep price, and I don't just mean money.

This article is a translation of the original Russian-language post.My journey of learning GPON 

Preparing an Optical Distribution Frame (ODF)

I'd like to share my experience with preparing a distribution frame (ODF) for installation. We try to buy pull‑out or swing‑frame ODFs, because if something goes wrong, it's much easier to replace a damaged adapter or resplice a pigtail.

The model shown in the photo isn't the best design — when you pull the frame out, it drags the cable along with it. It's much better when the cable stays fixed and only the module tray moves.

In that respect, NAG's swing‑frame ODFs are pretty good — but they have a drawback too: you can't recess the frame slightly into the enclosure, so there's a risk of damaging connectors when closing the cabinet door.

On the left side of the photo, you can see some mounting brackets taken from other wall‑mount ODFs and splice closures — these were salvaged from unused cable entry ports. You can end up with quite a collection of these over time :)

To fit these "new" brackets, we had to do a bit of modification — drill a few extra holes. They're marked with blue and red arrows in the photo.

And here's what we ended up with:

Cable ties are fine, but I prefer screws and nuts :)))

Next, we insert the adapters, label them, install the pigtails, route them, and trim them to fit the cassette. We often don't number the pigtails — instead, we use a visual fault locator during splicing to identify the right pigtail.

Here's a photo without the cassette for clarity:

And with the cassette in place:

We're planning to route the cable along the back wall of the frame from right to left, with the modules feeding directly into the cassette. I already visited the installation site beforehand to figure out the best way to bring the cable into the frame.

But really, repositioning the mounting brackets and pigtails shouldn't be a problem.

This article is a translation of the original Russian-language post.My journey of learning GPON