Evolution of fibre networking with V-SOL XGS-PON

Evolution of fibre networking with V-SOL

November 4, 2025
Gerhard Janse van Rensburg - Product Manager
Technical Tips & Guides
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Upgrade to XGS-PON without replacing your existing GPON or EPON equipment

As subscriber demand for high-speed, symmetrical broadband continues to grow, ISPs are exploring ways to deliver 10 Gbps services. But with existing GPON or EPON networks already supporting thousands of ONUs, splitters, and OLTs, rebuilding from scratch simply is not viable.

The V-SOL V1600XG02-W OLT makes it possible to introduce XGS-PON cost-effectively, without replacing a single ONU or changing your fibre infrastructure.

Built-in coexistence for a smooth migration

At the heart of the V1600XG02-W is WDMr1 (Wavelength Division Multiplexing Range 1) technology. It lets multiple PON standards share the same Optical Distribution Network (ODN) by separating their wavelengths:

GPON: 1490 nm downstream / 1310 nm upstream
XGS-PON: 1577 nm downstream / 1270 nm upstream

Because these bands do not overlap, both systems can operate simultaneously on the same fibre and splitter network, with no external filters or additional rack hardware required.

Result: a cleaner, cheaper, and faster way to deliver multi-gigabit services using the network you already have.

How it works and why it protects your investment

Connect to your live ODN - The V1600XG02-W plugs into your existing ODN and manages wavelength multiplexing internally, so no splitters or fibre runs need to be replaced.
Add XGS-PON ONUs for high-speed users - Subscribers who need faster speeds get XGS-PON ONUs running on the 1577/1270 nm wavelengths, while everyone else stays on GPON
Keep your current OLTs - Coexistence happens at the optical layer, so the V-SOL OLT can operate alongside any vendor’s GPON or EPON hardware. You retain full use of your legacy OLTs and extend their lifespan.
Upgrade at your own pace - Introduce XGS-PON only where demand justifies it. As older equipment reaches end of life, expand gradually without network disruption.

This coexistence model offers a zero-rebuild upgrade path that maximises return on your existing infrastructure.

Coexistence vs combo OLTs: which makes sense for you?

If you are building a new network, a combo OLT that supports both GPON and XGS-PON from day one may be ideal.

But if you are operating a live GPON or EPON network, the V1600XG02-W’s coexistence design delivers a far more cost-effective upgrade path:

No replacement of working ONUs or OLTs
No duplication of the ODN
Minimal power and rack space increase
Works with any vendor’s PON infrastructure

By reusing your current optical layer, you protect your investment while enabling high-speed symmetrical services where they are needed most.

Incremental migration in action - Example

Nova ISP runs a large third-party GPON network serving homes and businesses. As demand for symmetrical gigabit speeds grows, they deploy a V-SOL V1600XG02-W in the same Point-of-Presence as their existing GPON OLTs.

Thanks to the built-in WDMr1 module, XGS-PON services are delivered over the same fibre and splitter network. Premium customers are upgraded to 1 Gbps symmetrical plans, while the rest continue using GPON, all without downtime or re-splicing.

Within months, Nova expands its service offering, increases ARPU, and future-proofs its network without a rebuild.

Why V-SOL?

V-SOL has built a reputation for delivering reliable, interoperable, and cost-efficient fibre access solutions trusted by ISPs worldwide. The V1600XG02-W continues that tradition, giving operators the flexibility to scale smartly while protecting past investments.

Upgrade without disruption

Migrating to XGS-PON does not have to mean replacing your network. With the V-SOL V1600XG02-W, you can:

Deliver symmetrical multi-gigabit speeds.
Keep existing ONUs and OLTs in service.
Extend the value of your current ODN.

One network. Multiple PON generations. No disruption. Maximum return.

Want to learn more?

Chat to our sales team on sales@miro.co.za about your network setup and we will help you build a migration plan that fits your business. Whether you are running legacy GPON, planning a 10G rollout, or exploring coexistence, we will show you how to grow your capacity without growing your costs.