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I think the more important change that Tesla made is the change in the databus. Much higher performance ethernet. They changed the whole architecture of the car

I think the more important change that Tesla made is the change in the databus. Much higher performance ethernet. They changed the whole architecture of the car where there are now very few point to point connection, and its all essentially routed with a few major modules in each part of the car. If you look at current cars there are sometimes huge cable bundles, lots of individual cables for everything. Its a nightmare to build up and very hard to install. I think in their next generation assembly they will have these connection points be fixed and then just plug different sub assembly together at predetermined points. No more huge cable harness installed on completed bodies.

KaiserPro 3y ago
> Much higher performance ethernet. Depends what performance you are after. Ethernet isn't rated for safety critical stuff. It doesn't provide mechanisms for packet loss detection, and in most cases is pretty shit at flow control. Ethernet is also shit for small sensors/actuators. There are lots of low bandwidth devices that need power and comms, ethernet isn't designed for that. having to route 2 pairs of cables to everything in a star pattern is really impractical. Its probably ok for linking different zones, of non critical stuff. But running PoE? for all but specialist things, that sounds frankly stupid.
- sephamorr 3y ago
  There has been a lot of work developing standards for reliable ethernet for industrial and automotive applications, resolving most of the issues you mention which apply to 100/1000Base-T. Tesla isn't using your garden variety ethernet or abominations like ethercat. 100/1000Base-T1 is intended to be used with PoDL (802.3bg/cu) and TSN (various 802.1Q)to result in reliable links with guaranteed latency and bandwidth properties. PHY power is a few hundred mw though, and star topologies are limiting to replace CAN/LIN nodes, that's what 10Base-T1S is for though (cheaper, bussed, lower power).

KaiserPro 3y ago

> Much higher performance ethernet. Depends what performance you are after. Ethernet isn't rated for safety critical stuff. It doesn't provide mechanisms for packet loss detection, and in most cases is pretty shit at flow control. Ethernet is also shit for small sensors/actuators. There are lots of low bandwidth devices that need power and comms, ethernet isn't designed for that. having to route 2 pairs of cables to everything in a star pattern is really impractical. Its probably ok for linking different zones, of non critical stuff. But running PoE? for all but specialist things, that sounds frankly stupid.

sephamorr 3y ago
There has been a lot of work developing standards for reliable ethernet for industrial and automotive applications, resolving most of the issues you mention which apply to 100/1000Base-T. Tesla isn't using your garden variety ethernet or abominations like ethercat. 100/1000Base-T1 is intended to be used with PoDL (802.3bg/cu) and TSN (various 802.1Q)to result in reliable links with guaranteed latency and bandwidth properties. PHY power is a few hundred mw though, and star topologies are limiting to replace CAN/LIN nodes, that's what 10Base-T1S is for though (cheaper, bussed, lower power).