Fiber (GPON / XGS-PON)
AT&T Fiber Speed Test
AT&T Fiber delivers symmetric speeds — uploads as fast as downloads — with tiers from 300 Mbps up to 5 Gbps in fiber-served areas. If you're on AT&T's older DSL-based 'Internet' plans or fixed-wireless Internet Air instead, expectations are very different, so knowing which product you have matters before judging a test result.
What speeds should AT&T Fiber deliver?
On AT&T Fiber, a wired test should show download and upload speeds within about 10% of your tier, both directions. Symmetric uploads are fiber's superpower — if your uploads are dramatically slower than downloads on a wired test, something is misconfigured.
The included BGW320 gateway handles gigabit fine, but its WiFi is mid-range. Multi-gig tiers (2 Gbps and 5 Gbps) need a 2.5G/10G ethernet port and modern devices to actually measure full speed — a single laptop over WiFi physically cannot show 5 Gbps.
Slow AT&T Fiber speeds? Try this first
- 1Test wired into the AT&T gateway's LAN port — on multi-gig plans, use the 5G ethernet port on the BGW320 if your device supports above 1 Gbps.
- 2If you use your own router, enable IP Passthrough on the AT&T gateway to avoid double NAT, which can add latency.
- 3AT&T's Smart Home Manager app shows per-device usage — useful for finding a device saturating your connection during a slow test.
- 4WiFi 5 devices cap around 400–600 Mbps in practice; don't judge a gigabit fiber plan by an older phone's WiFi result.