# Hardware Layer Specification / Recommendations

**URL:** <https://forum.opencyphal.org/t/hardware-layer-specification-recommendations/1895>\
**Category:** Applications & Usage\
**Created:** [May 21, 2023, 5:51pm UTC](https://forum.opencyphal.org/t/hardware-layer-specification-recommendations/1895 "2023-05-21T17:51:11Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![pavel.kirienko](https://forum.opencyphal.org/user_avatar/forum.opencyphal.org/pavel.kirienko/32/9_2.png) [@pavel.kirienko](https://forum.opencyphal.org/u/pavel.kirienko)\
**Post date:** [May 21, 2023, 5:56pm UTC](https://forum.opencyphal.org/t/hardware-layer-specification-recommendations/1895/2 "2023-05-21T17:56:38Z")

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Please refer here for Cyphal/CAN:

> [@Cyphal/CAN Physical Layer Specification v1.0](https://forum.opencyphal.org/t/cyphal-can-physical-layer-specification-v1-0/1471):
>
> Today we release Cyphal/CAN Physical Layer Specification v1.0 named UCANPHY (the U is for historical reasons). The UCANPHY Specification [replaces](https://forum.opencyphal.org/t/removal-of-the-physical-layer-specification/895) the now-defunct physical layer section of the core Cyphal Specification. [UCANPHY\_Specification.pdf](https://forum.opencyphal.org/uploads/short-url/dbQwKsDMWiMVR0Q46d1yMqR6wAv.pdf) (2.6 MB) The UCANPHY standard is open to everyone, and it will always remain this way. No authorization or approval of any kind is necessary for its implementation, distribution, or use. Discussions that shaped this standard are accessible exclusively …

For the other transports, there are currently no such recommendations, but it is desirable to commence some work towards that.

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