GPON or XGS-PON: Symmetrical 10-Gigabit Fibre Has Arrived — Is Your Site Ready?
3 min read
For years, “fibre” meant GPON: up to 2.5 Gbit/s download and 1.25 Gbit/s upload, shared across the optical tree. Today, Italian operators — Open Fiber and FiberCop foremost among them — are switching on XGS-PON: 10 Gbit/s symmetrical, over the same fibre already laid. For a household, it is extra speed; for a business, it is a change of category — provided you understand what you are buying and have a site capable of handling it. Because here is the uncomfortable part: the bottleneck moves inside the building.
The differences that matter (without the jargon)
- Speed and symmetry. GPON: 2.5/1.25 Gbit/s, shared. XGS-PON: 10/10 Gbit/s, shared. Symmetry is the development that matters most for businesses: cloud backup, videoconferencing, replication between sites and bulk uploads all travel at the same speed as downloads.
- The same passive infrastructure. XGS-PON uses different wavelengths from GPON and can coexist on the same optical tree: the operator upgrades the equipment at both ends, while the fibre in the street stays the same. This is why coverage is expanding quickly wherever an FTTH network already exists.
- Still shared bandwidth. Like GPON, XGS-PON also divides capacity among the users on the tree. For most businesses that is perfectly fine; for those with guaranteed-bandwidth requirements and strict SLAs, the comparison should be made against a dedicated point-to-point access — that is a calculation best made on site, based on real traffic figures.
When the upgrade is really worth it
Three typical cases where symmetrical 10 Gigabit pays off immediately: cloud backup and disaster recovery (the overnight window that is never quite long enough shrinks by an order of magnitude), sites working with heavy files (CAD, video, medical imaging — healthcare is the classic case), and replication between a site and a data centre, or between plants. If, on the other hand, a site barely saturates 1 Gbit/s, a well-built GPON connection remains more than sufficient: the upgrade should be planned, not chased.
The point almost everyone discovers too late: the site
A 10 Gbit/s access delivered onto an internal network designed for Gigabit is a new engine on old wheels. The checks to make before signing off on the upgrade:
- The optical termination and the router: the delivery equipment changes (XGS-PON ONT), and the site’s firewall/router must have 10 Gbit ports — many installed business appliances top out at 1.
- The internal backbone: between the delivery point and the floor cabinets, properly sized and certified fibre runs are needed — cabling to EN 50173/50174 is exactly this kind of work. Older-category copper, over the wrong distances, brings everything back down to 1 Gbit.
- Distribution: access switches with 10 Gbit uplinks and, where needed, multigigabit connections to demanding workstations.
- Testing the whole chain: the speed stated in the contract is measured at the user’s socket, not at the operator’s termination point. Every internal run must be certified with instruments and a report, or the “10 Gigabit” remains on paper only.
The pre-upgrade checklist
- Measure your current traffic profile (peaks, upload volumes, timings): the upgrade must be justified by the numbers.
- Check the actual XGS-PON coverage at your address and the alternatives (dedicated access) with their respective SLAs.
- Take an inventory of the internal chain: ONT → router/firewall → backbone → switch → sockets. Every link below 10 Gbit is your new limit.
- Plan the cabling upgrade together with the contract change, not afterwards: one intervention, one round of testing.
- Insist on the certification report for every run that is touched.
Considering the move to 10 Gigabit, or finding that your new fibre is not performing as contracted? Talk to an engineer: a free site survey and quote, with the numbers based on your own figures.