Appendix

5.4 CAN-Bus Principles

The network topology used by the CAN bus is based on the so-called “bus or line topology”, i.e. all participants are connected via a single two-wire cable (Twisted-Pair cable, shielded or unshielded) with the cabling running from one participant on the bus to the next, allowing unlimited communication among all devices. In general, it does not matter if the bus member is a power amplifier, a N8000 or a UCC1 USB-CAN converter. Thus, the N8000 can be connected at any place of the CAN bus. In total, up to 100 devices can be connected to one CAN bus.

The CAN bus has to be terminated with a 120 Ω terminating resistor at both ends. If the termination is missing or an improper resistor value is used, network errors can occur as a signal is reflected on the bus at both bus ends. Because of the superposition of the reflection with the original signal, the original signal is blurred. This may result in the loss of data. In order to prevent or minimize reflections at the bus ends, terminators are used as they "absorb" the energy of the signal.

Since the CAN interfaces of all EVI Audio appliances are galvanically separated from the rest of the circuitry, network cabling also carries a common ground conductor (CAN_GND) ensuring that all CAN-interfaces in the network are connected to a common ground potential.

Bus Topology of the CAN bus

By using a CAN bus repeater a connection between two independent and self-contained CAN bus systems can be created. Thus, the following can be achieved:

•Increase of the max. number of members

A maximum of 100 devices can be connected to one CAN bus. This number can be increased up to 250 by connecting several CAN bus systems. This limitation of exactly 250 devices results from the addressing scheme used by the CAN bus. The addressing scheme allows the allocation of a maximum of 250 different CAN device addresses.

•Improvement of signal quality

With CAN bus systems, whose bus length exceeds 1000 meters, a CAN bus repeater should be used. The CAN bus repeater accomplishes a signal processing and a reinforcement of the

36NetMax N8000 System Controller

Owner’s manual

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Electro-Voice NetMax N8000 owner manual CAN-Bus Principles
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NetMax N8000 specifications

The Electro-Voice NetMax N8000 is a powerful digital signal processor (DSP) that has been designed to meet the demands of contemporary audio applications in both live sound and permanent installations. Offering a comprehensive suite of features, the N8000 provides high-quality audio processing, versatile routing, and a user-friendly interface, making it an ideal choice for audio professionals.

One of the standout features of the N8000 is its robust processing power. Equipped with multiple DSP cores, it can handle complex audio tasks simultaneously, ensuring that sound engineers have the flexibility they need to create intricate audio setups. The device supports up to 64 inputs and 64 outputs in configurations that can be easily customized through its flexible digital patching system. This scalability makes it suitable for a wide range of applications, from small venues to large concert halls.

Another key characteristic of the N8000 is its extensive network capabilities. The device supports Ethernet connectivity through the AVB (Audio Video Bridging) protocol, allowing for seamless integration with other AVB-enabled products. This feature allows for low-latency audio transmission and ensures high-quality signal integrity over longer distances, ideal for complex audio installations.

The N8000 also includes a comprehensive suite of advanced processing algorithms. These include delay, equalization, crossover, and dynamics processing, all of which can be easily adjusted via the intuitive software interface. The Electro-Voice NexSys software allows users to create and save presets, making it easy to recall specific settings for different events or venues.

In terms of build quality, the N8000 boasts a rugged chassis that is designed to withstand the rigors of touring and installation environments. Its rear panel features a variety of input and output options, including analog and digital connections, providing flexibility for different system designs.

Furthermore, the N8000 is designed with expansion in mind. Its modular architecture allows for additional cards to be added, enhancing the system's capability over time. This means that as audio technology evolves, users can keep their system up-to-date without the need for a complete replacement.

In summary, the Electro-Voice NetMax N8000 is a versatile and powerful DSP solution that combines advanced processing capabilities, robust connectivity, and a user-friendly interface. Its ability to adapt to various audio environments makes it an indispensable tool for sound engineers and installers looking to create the best possible audio experience.
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