✓ All trainings are offered as virtual sessions or in-person, on-demand or public, at Excentis or on-site. Highly interactive and with ample Q&A time! Predefined or tailored to your needs. Default language in English, but we also offer trainings in Dutch, French and German.
The Hybrid-Fibre-Coax (HFC) architecture has been adapted by many cable operators for internet, telephony and multimedia services. Understanding the performance of the individual components in an HFC network is important to estimate their impact on the communication signals in the return path (from customer to headend).
The course introduces the architecture and the basic components of the return path of an HFC network. Beside this, the attendee will get insight in modulations, multiple access techniques, analogue to digital, the different sources of interference, their influence on the communication signals, and some appropriate mitigation techniques. The audience is typical people starting in cable (engineering, network operations, management, …)
- Understand the architecture of an HFC network
- Knowledge of the performance of basic components in the return path of an HFC network
- Understanding of sources of interference and of techniques to reduce interference
PART 1: INTRODUCTION
- What is an HFC network?
PART 2: SIGNALS
- Down- and upstream · Voltage, power and frequencies · Analogue and digital modulation techniques (focus on QAM), power and spectral efficiency
PART 3: HFC NETWORK ARCHITECTURE
- HFC and backbone · Optical nodes · Coaxial distribution plant · multiple access techniques
PART 4: COMPONENTS
- Passive: coaxial cable · splitter · tap· diplex filter · optical fibre
Active: amplifier · NTU · laser · photo detector · optical node
PART 5: NOISE
- Internal interference: intermodulation · thermal noise · group delay · amplitude flatness · micro-reflections · HUM modulation · fibre-optic noise. External interference: ingress · impulse noise and the entry points · Impact · BER and SNR
PART 6: RETURN PATH NOISE MITIGATION
- Hardware techniques: optimal network installation · filtering of upstream components · equalization of attenuation ·
improved home network. Software techniques: frequency hopping · robust modulation techniques · FEC · interleaving
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