DOCSIS (Data Over Cable Service Interface Specification) is an international specification that allows high-speed data transmission (such as broadband Internet) through coaxial cable TV networks.
It was initially developed by CableLabs in the United States and is widely used by cable operators worldwide.
Main Versions of DOCSIS
| Version | Download | Upload | Notes |
|---|---|---|---|
| DOCSIS 1.0 | 40 Mbps | 10 Mbps | First commercial version |
| DOCSIS 2.0 | 40 Mbps | 30 Mbps | Improved upload |
| DOCSIS 3.0 | Up to 1 Gbps | Up to 200 Mbps | Channel bonding |
| DOCSIS 3.1 | Up to 10 Gbps | Up to 1–2 Gbps | OFDM, better spectral efficiency |
| DOCSIS 4.0 | Up to 10 Gbps | Up to 6 Gbps | Full Duplex (FDX), improved upstream |
How It Works
The DOCSIS modem connects to the coaxial network and communicates with an operator’s equipment called CMTS (Cable Modem Termination System).
It uses RF frequency bands to transmit and receive data simultaneously with TV signals.
It is a widely used solution in urban areas as it leverages existing TV infrastructure.
Applications in Testing and Measurement
In the context of DOCSIS modem production testing, tests such as:
- Channel synchronization and acquisition
- RF signal level measurements
- Throughput tests (actual speed)
- BER (Bit Error Rate) verification
Main Countries Using DOCSIS
DOCSIS (Data Over Cable Service Interface Specification) is widely deployed in countries with well-developed cable TV infrastructure as it uses the same coaxial cable used for television transmission.
Brazil
- DOCSIS is mainly used by operators like Claro, especially in urban areas.
Canada
- Strong presence, with operators like Rogers, Videotron, and Shaw.
United States
- Largest DOCSIS deployment in the world.
- Operators like Comcast (Xfinity), Charter (Spectrum), and Cox.
Europe
- Germany: Vodafone (Kabel Deutschland)
- Belgium: Telenet
- Netherlands: Ziggo (Liberty Global)
- United Kingdom: Virgin Media
🤝 How AJOLLY Testing Supports Your DOCSIS Project
AJOLLY Testing offers comprehensive support for DOCSIS-based projects, focusing on production testing, development, and validation. Our services include:
- 📐 Test architecture definition (hardware, software, and instrumentation)
- 🧪 Development of customized test benches
- ⚙️ Test automation with LabVIEW, TestStand, and C#
- 📡 RF measurements for DOCSIS 3.0, 3.1, and 4.0
- 🔄 Synchronization tests, channel acquisition, BER, throughput
- 📊 Integration with instruments like LitePoint, Keysight, R&S, Anritsu
- ✅ Compliance validation with DOCSIS standards
- 🔧 Support in calibration and troubleshooting in production
Our differential is the combination of electronic engineering, software, and metrology, ensuring efficiency, repeatability, and robustness in DOCSIS modem