Fibre Optic vs. ADSL: What's the Difference?
Understanding why fibre is so much faster, and whether ADSL still makes sense today.
| ADSL | Fibre optic | |
|---|---|---|
| Transmission medium | Copper cable (phone line) | Glass fibre cable |
| Typical speed | Up to 20-30 Mbps | 100 Mbps up to several Gbps |
| Upload speed | Very limited | Similar to download (symmetric in many cases) |
| Affected by distance to exchange | Yes, notably | Practically not |
Why fibre is so much better: light travels through the fibre cable with far less signal loss than electricity through ADSL's copper cable — that's why fibre keeps high speeds regardless of distance to the exchange, something that notably limited ADSL.
Does ADSL still make sense today?
Only in areas fibre hasn't reached yet — if fibre is available in your area, there's no real reason to prefer ADSL, except in very specific cases of extremely tight cost constraints.
Tip: if your internet is slow and you have ADSL, the single most noticeable improvement possible is usually switching to fibre if it's available in your area — before spending on other minor tweaks.
Frequently asked questions
Why is ADSL slower the further I live from the phone exchange?
Because the electrical signal through copper cable loses quality over distance travelled — fibre optic uses light instead of electricity, with far less signal loss along the cable.
Is it worth switching from ADSL to fibre?
Almost always, if it's available in your area — the speed improvement (especially upload) is usually very noticeable compared to ADSL.