• specifies PRP and HSR as two related redundancy protocols designed to provide seamless recovery in case of single failure of an inter-bridge link or bridge in the network, which are based on the same scheme: parallel transmission of duplicated information;

• specifies the operation of the precision time protocol (PTP) in networks that implement the two redundancy protocols (Annex A);

• specifies PTP profiles with performance suitable for power utilty automation (Annex B) and industrial automation (Annex C);

• includes for better understanding a tutorial (Annex D) on the PTP features effectively used in high-availability automation networks;

• includes a management information base for PTP (Annex E);

• defines a conformance test suite for the above protocols (Annex F).