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Survivability can be addressed in many layers in a network and protection can be performed at the physical layer (SONET/SDH, Optical Transport Network), Layer 2 (Ethernet, MPLS) and Layer 3 (IP).
Headquartered in West Chester, Pennsylvania, Aviom produces distributed audio networking gear which uses a proprietary digital audio transport system called A-Net, based on the physical layer of Ethernet and carried over Category 5 cables terminated with 8P8C connectors.
VSCP is independent from the physical layer (e.g. CAN bus, Ethernet, RS-485, RS-232, MiWi) connecting the individual nodes to form the automation network bus.