An access network connects end users to the core network. It is also known as the "last mile" for delivering various multimedia services, which could include Internet access, telephony, and digital and analog TV services.
Beside ADSL, discussed earlier, some known options for access networks are:
Hybrid Fiber - Coax (HFC) Cable Network.Optical fibers connect the core network with Optical Network Units (ONUs) in the neighborhood, each of which typically serves a few hundred homes. All end users are then served by a shared coaxial cable.
Traditionally, analog cable TV was allocated a frequency range of 50 - 500 MHz, divided into 6 MHz channels for NTSC TV and 8 MHz channels in Europe. For HFC cable networks, the downstream is allocated a frequency range of 450 - 750 MHz, and upstream is allocated a range of 5 - 42 MHz. For the downstream, a cable modem acts as a tuner to capture the QAM modulated digital stream. The upstream uses Quadrature Phase - Shift Keying (QPSK) modulation, because it is more robust in the noisy and congested frequency spectrum.
A potential problem of HFC is the noise or interference on the shared coaxial cable. Privacy and security on the upstream channel are also a concern.
Table Speed of Common Peripheral Interfaces
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Introduction To Multimedia
Multimedia Authoring And Tools
Graphics And Image Data Representations
Colour In Image And Video
Fundamental Concepts In Video
Basics Of Digital Audio
Lossless Compression Algorithm
Lossy Compression Algorithms
Image Compression Standards
Basic Video Compression Techniques
Mpeg Video Coding I – Mpeg 1 And 2
Mpeg Video Coding Ii- Mpeg-4, 7, And Beyon
Basic Audio Compression Techniques
Mpeg Audio Compression
Computer And Multimedia Networks
Multimedia Network Communications And Applications
Content-based Retrieval In Digital Libraries
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