What is the Presentation Layer? The challenge for any network system is to bring disparate systems and devices together to operate seamlessly together, and it is the OSI Presentation Layer that achieves much of the work required for that to happen in the OSI model. The major function it carries out is the translation of data between different formats on the fly, allowing each element of the network to use that data in the most effective way. In addition, the presentation layer carries out all the encryption and decryption processes too, maintaining security while also using compression techniques to reduce bandwidth use across the network for optimal performance. In practice, the presentation layer will be tailored to specific network needs, and a good example of this is found in the automotive industry. As we move to a more connected vehicle layout, the presentation layer offers a number of specific functionalities that aid vehicle operation, including: Multipurpose Internet Mail extensions (MIME) — Outside of email, this is used for data transmission in the auto industry, providing security for firmware updates and diagnosis data. Transport Layer Security (SLS) — The security element of the OSI system, ensuring that data is shared between devices without risk of compromise even if intercepted. JPEG, MPEG — We expect modern vehicles to provide a range of entertainment systems too, and the ability to translate data formats like JPEG and MPEG is essential for delivering those services. Conclusion One of the things that has changed most in the automotive industry in recent years is the reliance on connected technology. We use this to enjoy more efficient, capable vehicles, and at the heart of giving us as drivers these improvements is the OSI presentation layer. Whether its communications between devices on the vehicle, or with external systems for telematics and fleet management, the OSI presentation layer continues to grow in importance as our need for connected systems increases.
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