GreenWave C4000LG CenturyLink WiFi 6 Single Line xDSL Modem Router

The renewed GreenWave C4000LG is a WiFi 6 modem router combo built for CenturyLink and Brightspeed DSL internet. One device handles both the DSL connection and your home WiFi, replacing the gateway you rent from your provider and ending the monthly equipment fee. Every unit is Grade A Certified Renewed, professionally tested, and backed by our 90-day full coverage warranty.

Key Takeaways

• WiFi 6 modem router combo with four Gigabit Ethernet ports and a single DSL line port supporting all ADSL and VDSL profiles up to 17a.
• Approved for CenturyLink and used on Brightspeed DSL service in former CenturyLink territories (confirm with your provider before ordering).
• Replaces rented gateway equipment, which can save $120 or more per year depending on your plan.
• Grade A Certified Renewed, tested and cleaned, with a 90-day full coverage warranty and USA-based support.

Is the GreenWave C4000LG Compatible with My Internet Provider?

The C4000LG is designed and approved for CenturyLink DSL internet service. It is also used on Brightspeed DSL in the 20 states where Brightspeed took over CenturyLink's copper network. Because it supports every ADSL and VDSL profile up to 17a, it works across standard CenturyLink and Brightspeed DSL speed tiers. For setup help, see our CenturyLink activation guide or Brightspeed activation guide.

The C4000LG does not work with cable internet (Xfinity, Spectrum, Cox), fiber-to-the-home service, satellite, or 5G home internet. It connects through a telephone-style DSL wall jack, not a coaxial jack. Before ordering, confirm the C4000LG is approved for your specific plan and address with your provider.

WiFi 6 Performance on DSL

The C4000LG pairs its DSL modem with a WiFi 6 (802.11ax) router, a meaningful upgrade over the WiFi 5 gateways many DSL customers are still renting. WiFi 6 handles more simultaneous devices with less congestion, which keeps 4K streaming, video calls, and gaming stable even in busy households. Four Gigabit Ethernet ports cover wired connections for desktops, consoles, and smart TVs, and a single SSID covers your whole home so devices roam without switching networks.

GreenWave C4000LG Specs at a Glance

Save on Modem Rental Fees

CenturyLink and Brightspeed both charge a monthly lease fee for the gateway they supply, typically around $15 per month. At $180 a year, this renewed C4000LG pays for itself in about six months, and everything after that is savings. Check your current bill to see exactly what you are paying for equipment. If your rented gateway is aging or dropping connections, our guide on how long modems last covers the signs it is time to replace it.

What's in the Box

• GreenWave C4000LG DSL modem router (Renewed)
• Ethernet cable
• Power supply cable
• DSL / VoIP cable
• Online installation manual

How to Set Up the GreenWave C4000LG

1. Connect the DSL cable from your telephone wall jack to the DSL port on the C4000LG.
2. Plug in the power supply and wait for the status lights to stabilize.
3. Connect a computer or phone to the default WiFi network printed on the device label, or use the included Ethernet cable.
4. Follow the web-based setup wizard to complete activation with your CenturyLink or Brightspeed account.
5. Sign in to the admin interface to customize your WiFi name, password, and parental controls.

Why Buy the GreenWave C4000LG from ModemGuides

• 90-day full coverage warranty on every modem we sell, including this renewed C4000LG.
• USA-based customer service and tech support staffed by people who actually know networking gear, not a generic call center.
• Fast shipping from US warehouses, so most orders arrive in 1 to 3 business days.
• Curated, ISP-compatible inventory: we only stock modems and routers that are approved on real plans, with clear compatibility notes on every listing.
• Setup and troubleshooting guides available across ModemGuides.com to help you get online without the runaround.
• Small US business that puts customer experience first, with real humans answering your questions.

GreenWave C4000LG Frequently Asked Questions

Is the GreenWave C4000LG compatible with CenturyLink?

Yes. The C4000LG is approved for CenturyLink DSL internet service and supports all ADSL and VDSL profiles up to 17a, covering standard CenturyLink DSL speed tiers.

Does the GreenWave C4000LG work with Brightspeed?

The C4000LG is used on Brightspeed DSL service in the former CenturyLink territories Brightspeed now operates. If you are a Brightspeed customer, confirm the C4000LG is approved for your plan and address before ordering.

What does "single line" mean on the C4000LG?

Single line means the C4000LG connects over one standard DSL line, which is how most residential CenturyLink and Brightspeed DSL service is delivered. It does not support bonded (two-line) DSL. If your plan uses bonded DSL, check with your provider for a bonded-compatible gateway before ordering.

Is the GreenWave C4000LG a modem and a router?

Yes. The C4000LG is an all-in-one gateway with a built-in WiFi 6 router, so you do not need a separate router unless you prefer to use your own.

How fast is the WiFi on the C4000LG?

The C4000LG uses 2-stream WiFi 6 with wireless speeds up to 3 Gbps. Your real-world internet speed is set by your DSL plan, but the WiFi 6 radio keeps many devices connected smoothly at once.

Will the C4000LG work with cable or fiber internet?

No. The C4000LG is a DSL gateway and connects through a telephone-style wall jack. It is not compatible with cable providers like Xfinity, Spectrum, or Cox, and it does not work with fiber-to-the-home, satellite, or 5G home internet.

How do I set up and manage the C4000LG?

Setup runs through a web-based wizard, and ongoing management (WiFi name, password, guest network, parental controls) is handled in the built-in admin interface from any browser.

Is this C4000LG new or refurbished?

This C4000LG is Grade A Certified Renewed. Every function has been professionally tested, the device has been cleaned, and it is backed by our 90-day full coverage warranty.

What happens if the modem stops working?

If anything goes wrong within the first 90 days, contact our USA-based support team and we will troubleshoot, replace, or refund. We stand behind every modem we ship.