 and the telecom profiles in some depth; how- ever, there are other profiles specifically designed to address additional use cases or unique industry specifications. This section covers these profiles at a high level to help you understand the differ- ences compared to what has already been covered. There is ample material available on the Internet for each of these profiles, and given the understanding of profiles that you have gained up to this point, understanding them should be straightforward. Table 7-8 gives a summary of the major profiles, the supporting SDO, their adoption status, and the basic characteristics of each. Table 7-8 Characteristics of Major Profiles Industry Status Profile Transport/Type Clocks Undefined Annex I.3 Delay Request-Response Default PTP 1588* profile Undefined 1588* Annex I.4 Peer-to-Peer Default PTP profile Telecom ITU-T G.8265.1 telecom profile for frequency IPv4, IPv6 synchronization Ethernet Telecom ITU-T G.8275.1 telecom profile for phase/time (full support) G.8275.2 telecom profile for phase/time (partial IPv4, IPv6 Telecom ITU-T support) Enter- IPv4, IPv6 Draft prise TICTOC enterprise PTP profile IEC 62439-3 PTP Industry Profile (Annex C) layer Industrial 3 E2E Industrial IEC 62439-3 PTP Industry Profile (Annex C) layer Ethernet 2 P2P IEC 62439-3 PTP Industry Profile (Annex B) with Ethernet Industrial HSR and PRP IEC 61850-9-3 Power Utility Automation (optional Ethernet Power HSR and PRP) C37.238-2017 "Power profile" Revision of Ethernet Power C37.238-2011 Audi- Ethernet oVideo 802.1AS TSN generalized PTP Profile (gPTP) Audio AES67 Media Profile E2E/(P2P) IPv4/IPv6 Video SMPTE ST-2059-2 Broadcast Profile E2E/(P2P) Undefined Timing White Rabbit v2.0 *Note that Annexes J.3 and J.4 have moved to I.3 and I.4 in the 2019 edition of IEEE 1588. Here is a list of the major PTP profiles and their background: IEEE 802.1AS-2020: Timing and Synchronization for Time-Sensitive Applications. General- ized PTP (gPTP) is a profile covered by the Time-Sensitive Networking (TSN) Task Group fr