How to Activate a Modem With CenturyLink Internet (+ Phone Service Setup)

How to Activate a Modem With CenturyLink Internet

Setting up CenturyLink internet for the first time is straightforward once you understand the process. Whether you received a self-install kit in the mail or are reactivating a modem you already own, this guide walks you through every step from unboxing to getting online, plus how to set up CenturyLink phone service.

Important: CenturyLink Does Not Use Cable Modems

If you are searching for how to activate a "cable modem" with CenturyLink, here is something important to know. CenturyLink does not deliver internet over cable (coaxial) lines. CenturyLink provides internet through DSL (which uses your phone line) or fiber optic (which uses a fiber cable and an ONT device). The equipment CenturyLink provides is a DSL gateway or fiber router, not a cable modem. Standard DOCSIS cable modems from brands like Arris or Motorola will not work with CenturyLink service.

If you have a CenturyLink-provided modem or gateway, you are in the right place. Follow the steps below to get it activated.

What You Need Before You Start

Before you begin, make sure you have these items ready:

• Your CenturyLink modem or gateway (included in the self-install kit)
• The power adapter that came with the modem
• A green DSL phone cable or fiber cable (included in the kit)
• A yellow Ethernet cable (included in the kit)
• A working phone jack in your home (required for DSL service)
• Your CenturyLink order confirmation email with your service start date
• A smartphone, tablet, or computer to complete activation

Your CenturyLink service should be active by 7:00 PM on your scheduled start date. Do not attempt to set up your modem before that date. You may receive an email or text confirmation earlier in the day letting you know your line is ready.

Step 1: Place Your Modem in a Good Location

Choose a central, well-ventilated spot in your home near an active phone jack (for DSL) or your fiber ONT. Avoid closets, enclosed cabinets, or areas near microwaves, fish tanks, or other electronics. Good airflow helps the modem perform reliably and prevents overheating.

Step 2: Connect the Cables

For DSL service:

• Plug the green DSL cable into the green DSL port on the back of your modem.
• Plug the other end of the green cable into a working phone wall jack.
• Plug the black power cord into the modem and then into a wall outlet.

For fiber service:

• Connect the Ethernet cable from your fiber ONT (the box installed by the technician) to the WAN port on your CenturyLink router.
• Plug the power cord into the router and then into a wall outlet.

After plugging in the power, wait up to 15 minutes. Your modem needs this time to boot up and install firmware updates. Do not unplug or restart it during this process.

Step 3: Check Your Modem Lights

Before moving to activation, confirm your modem lights are showing the correct status:

• Front status light (solid blue): The modem has booted up and is connected to the CenturyLink network. You are ready to proceed.
• Rear DSL light (solid green): The DSL connection is active and working. This light is only present on DSL gateways, not fiber routers.
• Front status light (blinking): The modem is still booting up. Wait a few more minutes.
• Rear DSL light (red): The modem cannot connect to the CenturyLink network. See the troubleshooting section below.

Step 4: Activate Your Internet Service

Once your modem lights show that it is connected, you can complete the activation process. There are two ways to do this:

Option A: Activate Using the My CenturyLink App

1. On a smartphone connected to mobile data (not Wi-Fi), download the My CenturyLink app from the App Store or Google Play.
2. Open the app and tap "Install My New Modem."
3. Follow the on-screen prompts to verify your identity, accept the subscriber agreement, and finish setup.

Option B: Activate Using the QuickConnect Website

1. Connect a computer to your modem using the yellow Ethernet cable.
2. Open any web browser and go to http://connect.centurylink.com (use http, not https).
3. The QuickConnect setup wizard will appear. Click "Next" to begin.
4. Your identity will be verified automatically in most cases. Follow the prompts to accept the subscriber agreement.
5. When asked if you want to activate wireless, select "Yes, activate wireless" so you can connect devices over Wi-Fi.
6. You will see your default Wi-Fi network name (SSID) and password. Write these down or change them to something you will remember.
7. Click through the remaining screens to complete the process.

Step 5: Connect Your Devices

After activation is complete, connect your devices to the internet:

• Wi-Fi: On your phone, tablet, or computer, go to Wi-Fi settings. Find the network name (SSID) printed on the sticker on your modem or the custom name you chose during setup. Enter the password to connect.
• Ethernet: Plug an Ethernet cable from any of the yellow LAN ports on the back of the modem into your computer or gaming console for a wired connection.

How to Activate CenturyLink Phone Service

CenturyLink offers two types of home phone service. Which one you have determines how you set it up.

Option 1: Traditional Landline Phone (DSL Customers)

If you have CenturyLink DSL internet and traditional landline phone service on the same line, you need DSL filters to prevent interference between your phone and internet signals.

1. Locate the DSL filters that were shipped separately from your modem kit. If you did not receive any, contact CenturyLink through their online chat to request them.
2. Plug a DSL filter into every phone wall jack in your home that has a telephone connected to it.
3. Plug the phone cord into the DSL filter, not directly into the wall jack.
4. For cordless phones, you only need a filter on the base station that plugs into the wall jack. Remote handsets that only plug into a power outlet do not need filters.
5. Do not put a DSL filter between your modem and the wall jack. The modem connects directly to the jack without a filter.

If you need to plug both a modem and a phone into the same wall jack, use a DSL splitter instead of a standard filter. The splitter has separate ports labeled "DSL" (for the modem) and "Phone" (for the telephone).

Option 2: Connected Voice (VoIP Phone Service)

CenturyLink Connected Voice is a VoIP (Voice over Internet Protocol) phone service that works through your internet connection instead of a traditional phone line. It requires a separate adapter device.

Setting Up Connected Voice Basic

1. Place the Connected Voice adapter (called an ATA, or Analog Telephone Adapter) near your modem in a well-ventilated area.
2. Plug an Ethernet cable from the Internet port on the back of the adapter into an available Ethernet port on the back of your modem.
3. Plug a standard telephone cord from the Phone port on the back of the adapter into your landline telephone or cordless phone base.
4. Connect the power cord to the adapter and then to a wall outlet.
5. Wait up to 15 minutes for the adapter to self-configure. Do not unplug or restart it while any lights are flashing.
6. When the POWER, INTERNET, and PHONE lights are all solid green, the setup is complete and you can start making calls.

Setting Up Connected Voice With Air-Line (No Internet Required)

CenturyLink also offers Connected Voice with Air-Line, a standalone phone service that uses a cellular LTE connection instead of your home internet. If you have an Air-Line adapter:

1. Place the adapter near a window or exterior wall for the best cellular signal.
2. Plug the power cord into the adapter and then into a wall outlet.
3. Wait about five minutes for the adapter to boot up. The indicator lights on the front will turn green when the boot-up is complete.
4. Plug a phone cord from your telephone into the TEL (green) port on the adapter.
5. Pick up the phone and check for a dial tone. If you hear one, setup is complete.

If you also have CenturyLink internet, connect an Ethernet cable from the WAN (yellow) port on the Air-Line adapter to your router or modem before powering it on. Then follow the same steps above.

Activating Your Own (Non-CenturyLink) Modem

CenturyLink allows some customers to use their own modem or router, but there are a few things to keep in mind. Standard cable modems will not work with CenturyLink. Your modem must be DSL-compatible (for DSL service) or have the correct WAN interface for fiber. Before purchasing your own equipment, check the CenturyLink compatibility page to verify it will work with your plan.

If you are reusing a CenturyLink modem from a previous account, plug it in and perform a factory reset first. This clears old credentials and allows it to connect to your new service.

If you are using a third-party modem, you will need to contact CenturyLink via chat to get the PPPoE credentials or VLAN settings required for your modem to connect. You will not be able to activate through the QuickConnect process without these credentials.

Troubleshooting Common CenturyLink Activation Problems

DSL Light Is Red or Off

A red or unlit DSL light means your modem is not connecting to the CenturyLink network. Try the following:

1. Confirm your service start date has passed. Wait until 7:00 PM on your start date before troubleshooting further.
2. Make sure the green DSL cable is firmly plugged into both the modem's DSL port and the wall jack.
3. Try a different phone jack in your home if one is available.
4. Unplug both the power cord and the DSL cable from the modem. Wait two to three minutes, then plug everything back in and wait 15 minutes for it to reboot.
5. If the DSL light is still red after all of these steps, contact CenturyLink support for further troubleshooting.

Internet Light Is Amber or Orange

An amber or orange internet light usually means the activation process is not yet complete. Connect a device to the modem and visit http://connect.centurylink.com to finish the QuickConnect setup and accept your subscriber agreement.

Internet Light Is Red

A red internet light indicates a connection failure. Disconnect both the DSL and power cords from the modem, wait a few minutes, reconnect everything, and repeat the activation steps. If the light stays red, contact CenturyLink support.

QuickConnect Page Will Not Load

Make sure you are connected to the modem with an Ethernet cable, not over Wi-Fi. Type http://connect.centurylink.com in your browser address bar. Make sure you are using "http" and not "https." If the page still does not load, try clearing your browser cache or using a different browser.

Connected Voice Adapter Lights Are Not Turning Green

If the PHONE light on your Connected Voice adapter does not turn solid green after 15 minutes, first make sure your internet service is active and working. The adapter requires a working internet connection to self-configure. Try unplugging the adapter, waiting 30 seconds, and plugging it back in. If the issue persists, contact CenturyLink support.

Static or Noise on Landline Phone

If you hear static or buzzing on your CenturyLink landline phone, the most likely cause is missing or incorrectly installed DSL filters. Make sure every phone in your home has a filter installed between the phone cord and the wall jack. Also confirm that no filter is installed between your modem and the wall jack, as this will interfere with your internet connection.

CenturyLink Modem Activation FAQ

Can I use a cable modem with CenturyLink?

No. CenturyLink delivers internet over DSL or fiber optic lines, not cable. Standard DOCSIS cable modems are not compatible with CenturyLink service. You need a DSL-compatible gateway or a fiber router, depending on your plan type.

How long does CenturyLink modem activation take?

The initial modem boot-up takes up to 15 minutes. After that, the QuickConnect activation process usually takes less than 10 minutes. In total, most people are online within 30 minutes of plugging in their modem, assuming their service start date has arrived.

Do I need a phone line for CenturyLink internet?

For CenturyLink DSL service, yes. Your modem connects to the internet through an active phone wall jack. For CenturyLink fiber service, you do not need a phone line. Fiber uses a separate ONT (Optical Network Terminal) that a technician installs at your home.

Can I activate my CenturyLink modem over the phone?

CenturyLink modems cannot be activated by calling customer service. You must activate your modem online using either the My CenturyLink mobile app or the QuickConnect website at connect.centurylink.com.

What is the difference between CenturyLink landline phone and Connected Voice?

Traditional CenturyLink landline service runs over copper phone lines and uses DSL filters to coexist with internet service. Connected Voice is a newer VoIP service that transmits calls over your internet connection using a separate adapter. Connected Voice includes features like voicemail-to-email and unlimited long distance, but it will not work during a power outage unless you have a battery backup.

Why is my CenturyLink DSL light red after setup?

A red DSL light means the modem cannot detect an active signal from the CenturyLink network. The most common causes are that your service has not been activated yet (check your start date), the phone jack is faulty or inactive, or the green DSL cable is not properly connected. Try a different phone jack and reboot the modem before contacting support.

Do I need DSL filters if I have CenturyLink internet and phone?

Yes, if you have both CenturyLink DSL internet and traditional landline phone service on the same line. DSL filters must be installed on every phone jack with a telephone connected to it. Without filters, you may experience static on your phone and slower internet speeds. Do not install a filter on the jack connected to your modem.