Coax Cable Speeds
Coax Cable Speeds

Coaxial cables, commonly referred to as “coax” cables, have been a staple in the world of telecommunications and television for many decades. Although they might seem a bit old-fashioned when compared to modern fiber-optic solutions, these cables still hold significant relevance in today’s tech landscape. One common query about coax cables pertains to their speed capabilities. Let’s delve into the topic.

Understanding Coaxial Cables

At its core, a coaxial cable comprises a central conductor surrounded by an insulating layer, a metal shield, and finally, an outer insulating layer. This design enables the transmission of data over long distances with minimal interference.

Different Coax Cable Types & Their Speeds

Coax cables come in various types, and each has its own speed capability:

  1. RG-59: Historically used for cable TV, it’s not ideal for high-speed data transmission. Speeds can vary, but it’s generally only used for sub-10 Mbps connections.
  2. RG-6: The more modern version for cable TV and broadband internet. Depending on the modulation technique used, this cable can support speeds up to 1 Gbps (1000 Mbps) or more.
  3. RG-11: Used for longer distances, it can also support speeds up to 1 Gbps or even slightly more, depending on the distance and modulation.

Factors Influencing Speed

  1. Distance: The longer the cable, the more potential there is for signal loss (attenuation), which can reduce speeds.
  2. Interference: Coax cables are shielded, but strong interference sources can still impact performance.
  3. Modulation Techniques: Different data modulation techniques can push more data through the same cable, affecting the speed.
  4. Quality of the Cable: Higher quality cables will typically have better shielding and lower signal loss.

Coax in the Broadband Era

Many broadband providers use a technology called DOCSIS (Data Over Cable Service Interface Specification) to push internet data over coax cables:

  • DOCSIS 3.0: Supports speeds up to 1 Gbps downstream and 100 Mbps upstream.
  • DOCSIS 3.1: A more recent standard that can, in theory, support downstream speeds up to 10 Gbps and upstream speeds of 1-2 Gbps.

Keep in mind, the actual speeds you’ll experience in real-world scenarios can vary based on multiple factors, including your service provider’s infrastructure and the plan you’re on.


While coaxial cables might seem like relics of a bygone era, they’re very much alive and kicking in many broadband infrastructures worldwide. With the introduction of standards like DOCSIS 3.1, coax cables can comfortably support most modern internet activities, from streaming 4K videos to engaging in online gaming. Even as fiber-optic solutions continue to spread, the resilient coax cable remains an integral part of our digital landscape.

Eric Chan

Hi! I’m Eric and I work on the knowledge base at  You can see some of my writings about technology, cellphone repair, and computer repair here.

When I’m not writing about tech I’m playing with my dog or hanging out with my girlfriend.

Shoot me a message at if you want to see a topic discussed or have a correction on something I’ve written.

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