AVB Switch for ARM
The AVB Switch Stack is a versatile implementation of the IEEE 801.1BA bridge supporting a number of operating systems, from bare-metal using popular RTOSs to Linux. The number of ports is only limited by the selected switch fabric. Depending on the fabric support, multiple instances can run on the same fabric, emulating multiple disjoint switches, for example, for a primary/secondary network configuration.
The gPTP timing module retains information about the relationship between the current GM and the fabric’s local clock. An optional interface allows the stack to calculate the relationship to a system clock such as the CPU system timer or any other timer in the system.
An application interface allows for runtime configuration and monitoring, as well as access to an advanced logging system and clock relationships.
Software architecture diagram of the AVB Bridge Stack
Features
  • Complete AVB .1BA bridge stack
    • VLAN-aware Bridge component (IEEE 802.1Q)
    • IEEE 802.1AS - gPTP
    • IEEE 802.1Q - MVRP, MSRP, RSTP
    • IEEE 802.1 BA - Avnu .1BA bridge
  • Software platform independent using simple adaptation layer:
    • Linux implementation using pthreads and sockets
    • Bare-metal GNU/ARM using FreeRTOS, UCOS etc.
    • Vendor developed
  • Switch fabric independent using adaptation layer:
    • Marvell 88E6352, Marvell 88E632c, Marvell 88E6190(X)
    • Vendor developed
  • Efficient implementation optimized for memory/speed.
    Configurable dynamic or static memory allocation, protection of CPU from traffic storms.
  • Avnu Certification-ready
  • Application interface
    • Configuration, logging, and status
    • Clock relationship – system clock, fabric clock, and GM clock
Use cases
Flat design icon of several sizes and ports bridge stations (AVB switches)

AVB Switches

Flat design icon of a multiport endpoint device

Redundant Endstations

Flat design icon of a multiport endpoint device

Daisy Chain Endstations

Technical documents
Product Brief
AVB Switch Reference Design
Render of JOYNED's 10-port AVB Switch reference design
  • 10-port AVB Switch
    • 8 ports feature RJ45 connectors
      • 100Mbit and 1Gbit speed
      • PoE
    • 2 ports feature SFP caches
  • Form-factor
    • Designed to fit into 9.5” / 1RU enclosures
  • Debugging and monitoring
    • A USB interface is provided on the back for basic status monitoring.
    • Internally, a 1PPS-Signal is made accessible for assessing time synchronisation across a network.
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