| Version | Release date | Axum backplane PCB info and modifications |
| Rev. A | 16-10-2008 | Dante and AES67-USB card doesn't work, which means the Backplane has to be replaced for a newer revision! |
| “ | ” | New cards probably won't work because of Firmware differences! |
| | | |
| Rev. B | 14-04-2011 | unknown if AES67-USB card works |
| | | |
| Rev. C | 22-07-2013 | Improved digital clock |
| Rev. C | 22-07-2013 | AES67-USB card supported |
| | | |
| Rev. C | 27-02-2020 | Firmware update: Slot 19 fix to support AES67-USB card |
| Rev. C | “ | Slots 18 - 19 support 32x Mono in 32x Mono out (Remote software update needed) |
| | | |
| Rev. C | 05-05-2021 | Slots 12 - 19 support 32x Mono in 32x Mono out (Backplane firmware and software update is needed) |
