ifications: To fix errors and clarify unclear text, including developing inclusive names as an alternative for some terms in the standard Of course, the SDOs writing profiles now will begin to adopt the desired new features from v2.1 into the definition of their profiles. On the other hand, they will have to be somewhat cautious SO as not to cause issues with backward compatibility. As outlined in the section "IEEE PTP" in Chapter 4, there are several PARs now approved as fol- low-on work for IEEE 1588. Please see the references at the end of Chapter 4 for links to more in- formation on these projects. 7.8 Summary This chapter covered the full range of PTP technologies, both broadly and in depth. The earlier half covered the details of PTP based on the IEEE 1588 standards, whereas the latter part of the chapter (starting at "Profiles") outlined the different flavors of PTP based on the founding 1588 standard. Each of the major profiles was covered in the context of the industry segment that it is designed around along with a summary of their basic features. The chapter finished with a discussion of security aspects, the changes in the IEEE 1588-2019 edition, and the next steps for the IEEE with 1588. Now that PTP has been covered in some depth, the next task is to look at the substantial number of ITU-T recommendations used to define many aspects of using PTP as well as physical methods to support time transfer. Chapter 8 looks in detail at the ITU-T recommendations that are linked to SyncE and the telecom profiles for PTP. The goal behind providing this information is to allow the network engineer to gain an understanding of what document applies to which problem area as well as an outline of what is contained in each recommendation. Part III: Standards, Recommendations, and Deployment Considerations Chapter 8. ITU-T Timing Recommendations In this chapter, you will learn the following: Overview of the ITU: Describes the general structure of the International Telecommunication Union (ITU), and the part of the org