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Chapter 16. VESA > VESA ARCHITECTURE AND TECHNOLOGIES

VESA ARCHITECTURE AND TECHNOLOGIES

The VHN architecture is based on a digital baseband home network common to all intelligent devices in the home. An external network is terminated at an access device that demodulates, decodes, and decrypts according to the external network specification on the outside and interfaces to the common home network on the inside. User devices also on the baseband network in the home may access the external services or data through the access device. Thus the external services are shared and equipment replication is unnecessary. As well as physical layers, standardized information and control protocols are essential factors to ensure interoperability of home network devices. No one physical layer technology is perceived to satisfy all cost, bandwidth, and mobility requirements, so a network layer approach is used to allow seamless operation across different physical layers and, by using IP, also the Internet. IEEE 1394 is used for the main backbone of the home network because of its high bandwidth and inherent quality-of-service for multimedia delivery. Devices capable of accessing MPEG video streams attach directly to the IEEE 1394 network, while other devices may use technologies such as Ethernet, powerline, and RF. In the future, wireless 1394 may provide a no-new-wires option for the backbone. The VESA Home Network Committee has developed network, device, control, and network management models with interoperating standards based on existing specifications where possible. Work is progressing to make a complete IP-network-layer-based interoperability specification. The VESA home network will:

  • Allow complete interoperability for all devices in the home independent of the component network on which they reside

  • Provide an open, transparent interface for all access providers and for connecting multiple networks together

  • Accommodate all proposed residential gateway architectures

  • Simplify implementation of the residential gateway for all devices on the home network by providing a single-protocol interface on the IEEE 1394 home network backbone


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