How do I log into my Bbox administration interface?

Connect to your Bbox WiFi or Ethernet, then go to http://mabbox.bytel.fr or http://192.168.1.254. The first time you connect, you will be asked to press the physical WiFi button on the front of the box to set a password.

Why is my Bbox light red instead of white?

A solid white light means the Internet is connected. A red light indicates a loss of signal (fiber cut or unplugged cable) or an authentication failure. Check if the 'Internet' cable is securely plugged into the optical wall socket (PTO).

What speed should I get with Bbox Ultym?

The Bbox Ultym offers up to 2 Gbps download (shared) or 8 Gbps with the XGS-PON option. On WiFi 6E, realistic speeds are 1.2-1.5 Gbps if you have a compatible phone. On older devices, expect ~500-800 Mbps.

How do I fix gaming lag on Bouygues Fiber?

If you experience spikes, ensure you are not using the 'Bbox TV' decoder aggressively (4K streams) while gaming. For best results, separate the 2.4GHz and 5GHz bands in the administration panel (192.168.1.254) and connect your console to 5GHz.

Bouygues Speed Test

This tool validates Internet speeds for Bouygues Telecom subscribers. Whether you use the high-end Bbox Ultym (WiFi 6E) or the standard Bbox Must, measuring your speed helps ensure you are getting the bandwidth promised in your contract.

Bouygues Telecom is known for its excellent fiber network and "Guaranteed Internet" promise (via 4G key backup). However, optimizing settings on the Bbox administration panel is often key to unlocking full speeds.

Interpreting Bbox Results

Download Speed:
- Bbox Fit: Up to 400 Mbps.
- Bbox Must: Up to 1 Gbps.
- Bbox Ultym: Up to 2 Gbps (or 8 Gbps with XGS-PON option).
If you get <100 Mbps on Fiber, check if your Ethernet cable is Cat5e or better.

Upload Speed: Bouygues offers high upload speeds (up to 900 Mbps on Ultym). This is crucial for cloud backups and video conferencing.

Ping (Latency): Expect 3-10ms on Fiber. If you are on the "4G Box" or "5G Box", latency will be higher (25-40ms).

Bbox Administration (mabbox.bytel.fr)

You can manage your WiFi password, parental controls, and diagnose connection errors via the local Bbox interface.

Bbox Admin Details	Information
Gateway URL	https://mabbox.bytel.fr 192.168.1.254
Default Login	Admin (No password initially)
First Connection	Press the physical WiFi or OK button on the front of the box to set a password.

How to Separate 2.4GHz and 5GHz WiFi

Go to mabbox.bytel.fr.
Log in with your password.
Click on the WiFi block.
Select Advanced Configuration.
Uncheck "Unify SSIDs" (Unifier les réseaux).
Rename your 5GHz network (e.g., Bbox-5G) and save.

Troubleshooting Bbox Lights

Internet (White): Connected and working perfectly.

Internet (Red): No signal. Check the optical cable between the wall socket (PTO) and the Bbox. If persistent, call 1064.

WiFi (White): WiFi is ON.

Tel (White): VoIP service is active.

When to Contact Bouygues Support (1064)

Call 1064 (Customer Service) if:

The Internet light stays red after restarting.

You see error F3404 on your TV screen.

You need to order a WiFi Repeater included in your Ultym plan.

Bouygues Speed Test FAQs

How accurate is the Bbox Ultym WiFi 6E test? WiFi 6E devices can reach speeds over 1 Gbps wirelessly. However, you must be close to the router. Obstacles significantly reduce 6GHz signal strength compared to 2.4GHz.

Can I use my own router with Bouygues? Replacing the Bbox entirely is difficult because Bouygues does not officially support "Bridge Mode". It is easier to connect your router to the Bbox and set it as a DMZ host to avoid double NAT.

Why is my TV buffering on Bbox? If your speed test is good (>50 Mbps) but TV lags, the issue might be the CPL (Powerline Adapters) if you use them. Connect the TV decoder via Ethernet cable for a lag-free experience.