If you are building a fibre network or expanding an old one, one of the first questions is which PON technology to use: GPON or EPON. Both deliver fibre to the home using passive splitters, both work over the same kind of fibre, and both are sold widely in India. But they differ in speed, how many homes each port can serve well, equipment cost and how easily you can upgrade later. This guide compares GPON and EPON from an Indian ISP’s point of view and helps you decide which one suits your network.
Prices in this guide are approximate Indian marketplace listing prices seen in November 2026, mostly before GST. Always get current quotes from suppliers before you buy.
GPON and EPON in one minute
- GPON (Gigabit PON) is defined by the ITU-T G.984 standard. It runs at about 2.5 Gbps downstream and 1.25 Gbps upstream on each PON port, shared by all homes on that port.
- EPON (Ethernet PON) is defined by IEEE 802.3ah. It runs at 1.25 Gbps in both directions, which gives about 1 Gbps of usable capacity, shared by all homes on the port.
Both use an OLT (optical line terminal) at your network centre, splitters in the field and an ONT/ONU at each home. The outside fibre network, the cables and splitters, can be the same for both.
GPON vs EPON: side-by-side
| GPON | EPON | |
|---|---|---|
| Standard | ITU-T G.984 | IEEE 802.3ah |
| Speed per PON port | About 2.5 Gbps down / 1.25 Gbps up | 1.25 Gbps both ways (about 1 Gbps usable) |
| Usable downstream capacity | Roughly 2.3 Gbps or more | Roughly 1 Gbps |
| Typical split per port | 1:32 or 1:64 | 1:32, sometimes 1:64 |
| Typical reach | Up to about 20 km | Up to about 20 km |
| Wavelengths | 1490 nm down / 1310 nm up | 1490 nm down / 1310 nm up |
| 8-port OLT price (approx.) | About ₹55,000 to ₹1.4 lakh | About ₹47,000 to ₹63,000 |
| 4-port OLT price (approx.) | Fewer options; most ISPs start at 8 ports | About ₹23,000 to ₹34,000 |
| Basic ONU price (approx.) | From about ₹900 | From about ₹650 |
| Upgrade path | XGS-PON (10 Gbps) on the same fibre | 10G-EPON, less common in India |
| Best for | Most new ISPs selling 100 Mbps and faster plans | Small, budget networks with modest plan speeds |
What the speed difference means for your subscribers
The capacity of a PON port is shared by every home on it. A simple way to compare is to divide the port’s usable capacity by the number of homes, as if everyone downloaded at the same moment:
| Homes per port | GPON (about 2.4 Gbps) | EPON (about 1 Gbps) |
|---|---|---|
| 32 | About 75 Mbps each | About 31 Mbps each |
| 64 | About 37 Mbps each | About 16 Mbps each |
In real life, not everyone uses full speed at once, so you can sell plans well above these numbers. But the table shows the difference clearly: a GPON port has more than twice the room of an EPON port. If you plan to sell 100 Mbps, 200 Mbps or faster plans, GPON keeps speeds steady at busy evening hours with the same split.
What the cost difference really is
EPON’s main advantage is lower equipment cost, but the gap is smaller than it first looks:
- OLT: an 8-port EPON OLT can cost tens of thousands of rupees less than a GPON OLT. This is a one-time cost at your network centre.
- ONTs: basic EPON ONUs are slightly cheaper, but most homes now want a dual-band Wi-Fi ONT, and many of these are “XPON” models that work with both GPON and EPON at similar prices, often about ₹1,200 to ₹3,500.
- Fibre, splitters and labour: the same for both, and usually the largest part of the budget.
Because the OLT is one device and the fibre network costs the same, the extra cost of GPON is small when spread across a few hundred subscribers. For a full equipment list and sample budget, see FTTH business setup: equipment and cost.
Which is better for your ISP?
| Your situation | Better choice | Why |
|---|---|---|
| New ISP, selling 100 Mbps and faster plans | GPON | More capacity per port and an easy path to 10 Gbps |
| Dense apartments or colonies, 1:64 split | GPON | EPON at 1:64 leaves little bandwidth per home |
| Very small area, tight budget, plans up to about 50 Mbps | EPON can work | Lower OLT cost, with 4-port models available |
| Already running EPON and it works well | Keep EPON for now | Add GPON in new areas when capacity runs short |
| Business customers or gigabit plans in future | GPON, then XGS-PON | XGS-PON can share the same fibre with GPON |
For most Indian ISPs building a new network in 2026, GPON is the safer choice. The extra cost is modest, plan speeds keep rising, and GPON lets you add XGS-PON later on the same fibre and splitters, using different wavelengths, without rebuilding the outside network.
Compatibility: check before you buy
- GPON ONTs and OLTs from different brands do not always work together fully. Basic internet usually works, but Wi-Fi settings, remote management or VoIP may not. Test a few ONTs with your OLT before ordering in bulk.
- “XPON” ONTs can work on both GPON and EPON, which helps if you run both or plan to move from one to the other.
- Use the same optics class (for example B+ or C+) on your OLT ports as your power budget needs, especially with 1:64 splits or long routes.
- Standardise on one or two ONT models so your technicians, spares and fault-finding stay simple.
Moving from EPON to GPON
If your EPON network is running short of capacity, you do not need to rebuild everything. The fibre, splitters and FAT boxes can usually stay as they are. A typical move looks like this:
- Start with the busiest PON ports, where evening speeds drop first.
- Install a GPON OLT alongside the EPON OLT and connect the selected feeder fibres to it.
- Replace ONTs on those routes with GPON or XPON ONTs, one area at a time, at a pre-announced time.
- Offer an upgrade plan with the change, so subscribers see a benefit for the visit.
- Update your records: the new ONT serial number against each subscriber, and the old ONT returned to stock.
For moving subscribers from copper or cable to fibre, see FTTH for ISPs: fiber vs copper.
What does not change: billing and operations
Whichever PON you choose, subscribers are billed and controlled the same way. Plans and speeds are applied through RADIUS and your core router, not the PON standard. What changes is the equipment you track: OLT ports, ONT models and serial numbers.
ISPMate is cloud-based ISP billing software for internet service providers in India, for GPON and EPON networks alike:
- Plans with speed profiles through RADIUS, with automatic suspension on expiry and reconnection on payment
- Inventory tracking for ONTs and routers by serial number, including which subscriber has which device
- Installation and complaint tickets assigned to field technicians, with a mobile app and GPS tracking
- GST invoices, online payments by UPI, card or net banking, and reports on renewals and dues
Frequently asked questions
Is GPON better than EPON?
For most new ISPs, yes. GPON gives about 2.5 Gbps downstream per PON port compared with about 1 Gbps usable on EPON, so each home gets more bandwidth at the same split, and GPON can be upgraded to XGS-PON on the same fibre. EPON is cheaper and can still suit small networks with modest plan speeds.
Is EPON cheaper than GPON in India?
Yes, mainly at the OLT. An 8-port EPON OLT can cost tens of thousands of rupees less than an 8-port GPON OLT, and 4-port EPON models are available. The fibre, splitters and labour cost the same, and Wi-Fi ONTs are similarly priced, so the total difference is small when spread across subscribers.
Can GPON and EPON use the same fibre network?
The fibre cables, splitters and distribution boxes can be the same for both. You need a GPON OLT and GPON-compatible ONTs to run GPON, but the outside fibre network can usually stay in place when moving from EPON to GPON.
Do GPON ONTs work with any GPON OLT?
Not always fully. Basic internet usually works across brands, but features such as Wi-Fi management or VoIP may not. Test ONTs with your OLT before bulk purchase, or use models your OLT vendor supports.
What is XGS-PON and do I need it?
XGS-PON is the 10 Gbps upgrade of GPON, with 10 Gbps in both directions per port. It can run on the same fibre as GPON using different wavelengths. Most ISPs start with GPON and add XGS-PON later for dense areas, business customers or gigabit plans.
Building or upgrading your fibre network? Book a free ISPMate demo or call +91-9310313545 to see billing, RADIUS and ONT inventory working together.
Sources: ITU-T G.984 (GPON), IEEE 802.3ah (EPON), vendor technical guides on PON technologies, and Indian marketplace listings for OLTs and ONUs. Prices are indicative only. Last reviewed: November 2026.