Coaxial cables typically deliver 500 Mbps to 1 Gbps in real-world conditions, while fiber optic cables can provide 1 Gbps to 400 Gbps depending on the setup and distance.

Coaxial Cable Speeds

Coaxial cables transmit data using electrical signals over copper, which makes them more susceptible to interference and signal degradation over distance. In typical broadband configurations, coaxial cable speeds reach up to 1 Gbps, with advanced DOCSIS 3.1 standards theoretically supporting downstream speeds up to 10 Gbps and upstream speeds up to 1 Gbps. However, practical performance is often limited to 500–1000 Mbps due to shared bandwidth among multiple users, signal attenuation, and network congestion during peak hours . Factors affecting coaxial performance include:

• Cable quality: RG6 or RG11 cables perform better than older RG59 lines .
• Distance: Longer runs increase signal loss; RG6 loses less than 6 dB over 100 ft .
• Network sharing: Multiple subscribers on the same line can reduce speeds by 30–50% during peak usage .
• Environmental conditions: Weather exposure and corrosion can degrade signal quality . Coaxial bandwidth typically reaches up to 1 GHz, sufficient for multiple HD channels and internet traffic, but higher frequencies experience greater loss, limiting simultaneous high-bandwidth applications .

Fiber Optic Cable Speeds

Fiber optic cables use light to transmit data through glass or plastic strands, resulting in minimal signal loss and high reliability. Residential Fiber to the Home (FTTH) setups start at 1 Gbps, while enterprise and data center environments can achieve 100–400 Gbps. Single-mode fiber can maintain 10 Gbps over 40 km without amplification, and multimode fiber can reach 400 Gbps over short distances . Advantages of fiber over coax include:

• Higher bandwidth: Supports multiple high-definition streams and large data transfers simultaneously.
• Symmetrical speeds: Upload and download speeds are often equal, unlike coax which has lower upload rates .
• Lower latency: Fiber maintains low latency (5–10 ms for multimode), critical for gaming and real-time applications .
• Minimal signal degradation: Fiber can maintain speed over long distances without amplification, unlike coax .

Summary

While coaxial cables remain a cost-effective solution for home and small business internet, their real-world speeds are generally capped at 500–1000 Mbps, and performance can fluctuate due to shared bandwidth and signal loss. Fiber optic cables, on the other hand, offer much higher speeds, consistent performance, and lower latency, making them ideal for high-bandwidth, multi-user, and data-intensive applications . Choosing between coax and fiber depends on budget, required speed, distance, and network reliability needs, with fiber being the superior option for future-proof, high-performance networks.