Failed to detect a DSL signal NAD-3305D | AT&T Community Forums (2024)

FAQs

How to fix failed to detect a DSL signal NAD 3305D? ›

Power-cycle the DSL modem

Turning the modem off and back on causes it to re-synchronize the DSL signal and the network connection to your computer. Often, this by itself is enough to fix a DSL connection problem. To do this, unplug the power cord from the DSL modem, wait about 30 seconds, then plug it back in.

This indicates that your modem router can't detect DSL service from your Internet service provider (ISP). If you are experiencing a No DSL Cable is Plugged into the Router ADSL Port error, try the following: Check your cable connections.

Check the Wiring

Check for damage along the cables and loose connections at the end of the cable. Replace any damaged cables. Ensure the phone cable that runs from the modem to the wall does not go through a filter, cheap splitter, surge protector, or extension cable. The shorter the cable the better.

• Power-cycle the DSL modem

modem, wait about 30 seconds, then plug it back in. If you are using an external router, power-cycle it as well.

Unplug the power cord from the WiFi router. Wait at least one minute, then reinsert any batteries and reconnect power to the modem. Wait at least two minutes to allow the modem to power up. The modem's lights should gradually turn on to confirm the device has power and is connected to the internet.

Reduced Speeds and Reduced Connection Quality

If you feel that your internet speeds have decreased or you are seeing issues with increased buffering and lagging or breaking in the connection, it could be time for a new modem. You can easily test your internet speed with online tools like Speedtest.net.

There are tons of different options, including fixed wireless, 4G and 5G home internet, mobile hotspots, and satellite. Each one has its pros and cons, so we're here to walk you through them so you can find the solution that works for you.

To check the ADSL network connectivity, look for the DSL/ADSL/WAN light (the name of this light may vary depending on the model). This light should also be solid. The LAN/Activity light shows the Internet activity level. This light could be solid or flashing, depending on the activity level.

You usually need a modem and a router to connect to the ISP and provides internet to other devices. A DSL modem router has both built into one box. DSL is an initialism for "Digital Subscriber Line", which is a technology that enables high-speed data transmission on ordinary twisted-pair telephone lines.

Should the DSL light be on my modem? ›

A solid DSL light means the internet should be working. If the no connection persists, try using another ethernet cable for wired connections or check to see if WiFi is enabled. The WiFi should blink frequently with activity. A flashing DSL light means there is no sync on the line.

The bottom line. Most customers should opt for cable internet over DSL. Cable internet is much faster, highly reliable, and widely available. DSL is nearing the end of its life cycle as a mainstream internet type, as many DSL services aren't up to the task of modern internet usage.

Both RF (Radio Frequency) and EMI (Electro Magnetic Interference) can cause issues with DSL.

To optimize your wiring for better performance, use the shortest and most direct phone cable from the phone jack to the DSL modem. Additionally, use twisted pair or shielded cables to reduce electromagnetic interference from other sources such as power cords.

DSL is being phased out as technology advances with options like fiber optic and 5G. The decline of DSL accentuates the existing digital divide. While major providers are transitioning from DSL to fiber, there's a disparity in coverage.

Turn your DSL modem and computer off (reboot) and wait for at least 2 minutes. While the modem is off, remove the phone line from the modem and plug it back in. Turn the modem and computer back on. Once the computer and modem is on, wait several minutes and check to see if you have restored connection.

To reset the device: unplug the device from the USB port then plug the device back in. The device will take a moment to power on.