====== Software versioning of DHD Software & Firmware ======

Every DHD software and firmware (which is basically software running in an embedded environment) is always identified by a unique software version number.

===== Version numbering pattern and meaning =====

DHD software is always versioned based on a fixed pattern.

{{ :x3:software-versioning.png?350 |}}

  * **Major:** differences in major versions contain large changes and major incompatibilities to lower major and minor version numbers.
  * **Minor:** differences in minor versions contain changes and incompatibilities to lower minor or major version numbers.
  * **Patch:** differences in patch versions contain changes and are basically compatible to other patch version numbers within the same minor version.

===== Compatibility of different software versions in DHD environments =====

Different DHD software products can have different version numbers.

To make it easy recognizing compatible software, compatible DHD Software products have the same **major** and **minor** version numbers. Only patch numbers can differ.

==== Version 10.0 and higher ====

Since version 10.0, the following DHD software and firmware is using the same major and minor versions:

  * Firmware
  * AES67 Firmware
  * Toolbox
  * Operation Manager & Operation Server
  * XC3 kernel
  * XD3 kernel

==== Version 8.0 and higher ====

Since version 8.0, the following DHD software and firmware is using the same major and minor versions:

  * Firmware
  * Toolbox
  * Operation Manager & Operation Server

==== Exceptions ====

Exceptions in version numbering:

  * DHDCS
  * AES67 firmware before version 10.0
  * XC/XD/XS kernel
  * XC2/XD2/XS2 kernel