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T-Mobile 5G Gateway User Guide
Troubleshooting
No Signal
This LCD alert indicates there is no network signal, which could mean local cellular equipment is down for any number of reas ons, or
the gateway may need to be re- positioned.
If the connection does not improve in a reasonable amount of time, you can contact T- Mobile customer service or refer to the section
"Manual Setup: Identify an Ideal Location".
Prevent Overheating
Make sure that obstacles never obstruct airflow vents on the top or bottom of the gateway's enclosure. Allow at least 100mm/4in
clearance on all sides of the enclosure. Ensure the gateway is at least 3 feet from baseboard heaters.
T-Mobile 5G Gateway Does Not Start
If the gateway does not start up, verify the provided power cord is connected to an outlet. If the gateway is connected to an outlet and
power still does not start, contact T-Mobile technical support.
Poor Internet Experience
If you feel your overall internet experience is poor, try repositioning the gateway; refer to the section
"Manual Setup: Identify an Ideal Location".
Forget Your Admin Password?
If you configure a custom admin password and forget it, use the password reset function found within the T-Mobile Internet mobile app
to reset the password to factory default.
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Need help? Visit
https://www.t-mobile.com/internethelp
or call T-Mobile customer service at
1-844-275-9310
or call Metro support service at
1-888-8Metro8
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Need help?
Do you have a question about the FAST 5688W and is the answer not in the manual?
Questions and answers
I want to power this router from a UPS. Do I have to go into the C-port at 15V, or can I use the POE (ethernet ports) ?
The SAGEMCOM FAST 5688W router requires a 15V connection to the USB Type-C port and cannot be powered using Power over Ethernet (PoE) through the Ethernet ports.
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I just want to leave a comment and don't see anywhere else to leave it. Thank you so much for having this information here. T-moble's site did not have instructions to hard reset this model and I was so frustrated becausenothing else would work. I was finally able to get the internet reconnected and able to sleep knowing my son's medical devices were connected properly and would not drop every few minutes.
How do I reset the wi-fi password
To reset the Wi-Fi password on a SAGEMCOM FAST 5688W, follow these steps:
1. Access the gateway settings by using a script and entering the admin password from the sticker on the device (not the Wi-Fi password).
2. If you changed the admin password, use the updated one.
3. Once logged in, you will see a menu with several options.
4. Navigate through the menu to find the option to change or disable Wi-Fi settings.
5. Make the desired changes, including updating the Wi-Fi password.
If you cannot access the settings due to a forgotten admin password, perform a hard reset:
1. Make sure the device has power.
2. Press and hold the reset button on the gateway until the device resets.
3. After reset, use the default admin credentials on the device sticker to log in and update the Wi-Fi password.
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