Yazaki Power & Data Network (PDN) Solutions
Incorporating the company's proven approaches to power and data distribution, Yazaki PDNs capitalize on today's most advanced infrastructure strategies and technologies. As a result, they offer system designers an opportunity to optimize space, save weight, extend reliability, and build in scalability. Equally important, they offer reduced costs and shorter development cycles.
All system components - including wire harnesses, power distribution components, sub-networks and gateways - are united through an adaptive system architecture, allowing each to be applied independently, or combined with others to form a completely integrated PDN.

Development Parameters
Factors contributing to the success of Yazaki PDNs include:
• Intelligent Distribution that supplies the right power and data precisely where it is needed
• Efficient networking that eliminates redundant components by allowing multiple input and output devices to communicate over a common data channel.
• Smart Gateways that enable data sharing between networks
• Optical Fiber Technology that can efficiently meet the high-bandwidth needs of multimedia applications like DVD, video, and internet connectivity
• Wireless Technologies, such as Bluetooth, that enable the vehicle to communicate seamlessly with the outside world using GPS, cell phones, and other telematics applications

The Right Partner
Yazaki has the experience needed to integrate the components and technologies that comprise today's advanced vehicle power and data networks - and the expertise required to successfully implement PDNs in cooperation with automakers worldwide.

PDNs: The Benefits
Improving vehicle performance and integrity, while controlling cost
Yazaki PDNs satisfy a number of automotive design requirements, including:

Reliability: Yazaki PDNs are designed to perform error-free under adverse conditions for the life of the vehicle.

Flexibility: To allow for content variation across models, and compatibility with aftermarket devices, Yazaki PDNs offer network scalability and upgradeability.

Cost Efficiency: Yazaki PDNs carefully balance performance and other benefits against cost and competitive impact.

Connector Optimization: The number of connectors, and connector size and functional integration, are critical variables in the design of every Yazaki PDN.

Fault Tolerance: Susceptibility to faults and the need for system redundancy are major considerations in the deployment of any Yazaki PDN.

Modularity: Where appropriate, Yazaki PDNs employ standard modules to reduce design cycles and lower costs.

Electromagnetic Compatibility (EMC): Yazaki plastic optical fiber (POF) sub-networks are designed to eliminate unwanted electromagnetic fields which can disrupt the network and nearby devices.

PDNs: The Infrastructure
A model that illustrates the opportunities inherent in advanced vehicle power and data networks
Yazaki power and data networks (PDNs) are based on a conceptual model called the four-layer network infrastructure. This model subdivides the network into segments based on broad functionality, data-transmission speed, and corresponding data protocols. A given layer may be made up of two or more sub-networks.

1. Infotainment Layer includes advanced audio and video devices, wireless phones, voice-activated systems, instrumentation sensing, and other systems requiring SAE Class D data. transfer speeds (>1Mbps). To accommodate high bandwidth applications, the infotainment layer incorporates an optical fiber network based on the MOST data protocol. MOST - which stands for Media Oriented Systems Transport - is the emerging network standard for in-vehicle multimedia and entertainment devices.

2. Body Layer provides control of lighting, HVAC, door and seat functions as well as speed control, and instrumentation. These functions are supported by low-speed, SAE Class A networks operating at under 10 kb/s, and SAE Class B networks running at 10-125 kb/s.

3. Safety and Mobility Layer incorporates airbags and engine control modules plus steering, transmission and x-by-wire systems. These systems are supported by SAE Class C and Class D networks, which provide real-time control, with operating speeds from 125 kb/s to 1 mb/s and greater.

4. Energy Layer includes power generation, storage and distribution elements (typically an alternator, battery and under hood power distribution component).

The four-layer model is conceptual. Its purpose is to illustrate the potential advantages of Yazaki PDNs over traditional electrical distribution systems, including lighter weight, enhanced reliability, reduced costs, built-in scalability, and reduced development cycles.