The PTP
field offset (i_ptp_ts_offset, i_ptp_cf_offset, and i_ptp_csum_offset) for a 1-step operation must follow one of the
following formats:
- eCPRI type 5 message
- PTP message transported over Ethernet, UDP with IPv4 protocol, UDP with IPv6 protocol, with a VLAN, stacked VLAN, or MPLS header encapsulation.