What Is DOCSIS 4.0? The Future of Multi-Gig Cable Internet Explained

You might’ve come across the term ‘DOCSIS 4.0’ while researching the router or equipment your internet provider uses. At first, it might sound like another selling gimmick or a marketing buzzword. In reality, DOCSIS 4.0 is the future of cable internet, and if a provider is ‘truly’ offering it, then it’s a jackpot. This guide breaks down what DOCSIS 4.0 is, how it compares to its previous versions, and the benefits it brings. So, let’s get started:

Key Takeaways:

• DOCSIS 4.0 is the latest cable internet standard, ensuring download speeds up to 10 Gbps with 6 Gbps upload speeds.
• Major ISPs, including Xfinity, Spectrum, etc., are rolling out the technology in select markets.
• Widespread availability is expected by 2030.
• DOCSIS 4.0 brings fiber-like performance using existing cable infrastructure.

What Is DOCSIS 4.0?

DOCSIS, or Data Over Cable Service Interface Specification, is a technology standard used by cable companies to deliver broadband services. These companies use coaxial cables, the same ones used for cable TV services.

It started with DOCSIS 2.0, which was used for basic broadband services. With upgrades, DOCSIS 3.0 was introduced, followed by DOCSIS 3.1, the standard most widely used, which is powered by OFDM technology. DOCSIS 4.0 was introduced in 2017; however, it’s still in its early release stages.

What Happens with DOCSIS 4.0?

DOCSIS 4.0 incorporates two technologies:

• Full Duplex DOCSIS
• Extended Spectrum DOCSIS

The Full Duplex DOCSIS (FDX) allows this technology to achieve symmetrical or near-symmetrical speeds. However, its complete implementation requires an entirely new cable infrastructure.

The Extended Spectrum DOCSIS (ESD) is a cheaper alternative as it works with the existing cable infrastructure. However, instead of increasing the speed, it only expands the usable frequency to 1.8 GHz. It’s one of the reasons why most ISPs are deploying ESD instead of FDX.

What are the Benefits of DOCSIS 4.0?

Being the latest standard, DOCSIS 4.0 carries the best attributes for coax-cable internet solutions. A DOCSIS 4.0 connection with a compatible gateway can provide:

• Fast download speeds, up to 10 Gbps.
• Fast upload speeds up to 6 Gbps.
• Near symmetrical speed for most connections.
• Lower latency for smooth online sailing.

Unlike previous generations, which were more focused on improving download speeds, DOCSIS 4.0 focused on ensuring symmetrical or near symmetrical speeds, a real game changer.

DOCSIS 3.1 vs DOCSIS 4.0: Key Differences

Even though DOCSIS 4.0 has better performance, DOCSIS 3.1 is still the most widely used standard by cable internet providers. Let’s check out the comparison between DOCSIS 3.1 and DOCSIS 4.0 to see how each differs:

What Does it Mean for the Users?

As highlighted earlier, the main development with DOCSIS 4.0 is the improvement in the upload speeds. With this, the users can:

• Enjoy seamless remote work.
• Upload large files across servers easily.
• Live stream without lags.
• Instantly communicate with connected smart home devices.

Once you have successfully upgraded to a DOCSIS 4.0 connection, you can enjoy:

• Faster upload speeds across various destinations.
• Improved connection reliability with low latency.
• Access to plans with symmetrical speeds.
• Access to easy infrastructural upgrades, as existing cables can easily be tuned for fiber networks.

However, to access the benefits, you need a compatible modem and router as well. In most cases, your internet provider will provide you with one, or you can buy a DOCSIS 4.0-compatible gateway from the market.

Which Internet Provider Is Offering DOCSIS 4.0?

As of now, Comcast Xfinity has announced that it’ll be rolling out DOCSIS 4.0 technology for its ‘X-Class Internet products’. These are regarded as next-gen services, offering symmetrical speeds with ultra-low latency for removing cable internet bottlenecks.

Charter Spectrum is currently upgrading its hybrid fiber-coaxial HFC network to embed DOCSIS 4.0 technology through vendor hardware. Apart from these, providers, including Cox, Mediacom, etc., are currently in testing phases of implementation.

DOCSIS 4.0 vs Fiber Internet: Is Cable Still Worth It?

Another question that pops into the minds of users is whether DOCSIS 4.0 is a better option than fiber internet. Here’s what clears this up:

• Fiber isn’t available everywhere, but cable is. Upgrading the existing cable network can easily help implement DOCSIS 4.0 technology, improving overall connectivity.
• With DOCSIS 4.0 implementation, cable internet providers can offer symmetrical speeds with low latency, competing with fiber internet connections easily.
• DOCSIS 4.0 also implements multi-gig speeds. Users don’t need to buy expensive fiber plans when they can attain high symmetrical speeds with cable providers.

In other words, the DOCSIS 4.0 implementation with FDX and ESD can significantly improve internet performance for cable and HFC providers. It can be implemented on a wide scale due to the existing cable infrastructure, easily. It’s not better but equal to fiber internet; however, users can enjoy wide availability.

To Sum Up

The DOCSIS 4.0 technology is a giant leap for cable internet. Its full-scale implementation can bridge the performance gap for cable internet providers by ensuring symmetrical speeds, ultra-low latency, and seamless connectivity, transforming the experience for cable internet users.

Frequently Asked Questions

Will my current modem work with DOCSIS 4.0?

Most existing gateways are compatible with DOCSIS 3.1. Therefore, you need to upgrade to a new gateway with DOCSIS 4.0 compatibility.

Is DOCSIS 4.0 better than fiber?

Not exactly, since DOCSIS 4.0 offers similar performance and brings fiber-like connectivity to more areas due to cable availability.

Is DOCSIS 4.0 available now?

Yes, DOCSIS 4.0 technology is available in selected markets by selected providers, including Xfinity, Spectrum, etc.