Calrec IP Primer Part 3: PTP
In this chapter of Calrec’s IP Primer we look at Precision Time Protocol (PTP) in more detail.
PTP refers to PTPv2, the 2008 revision of IEEE1588. In an IP network it removes the need for separate synchronization infrastructure, and it in fact mandated as part of AES67 and SMPTE ST2110.
We look at what is acceptable and what is unacceptable when it comes to accuracy. We will discuss the pros and cons of ordinary, transparent and boundary clocks and how they affect scalability and Quality of Service, and we talk about port states.
We will also take our first look at the Best Master Clock Algorithm (BMCA). The BMCA decides which NICs and switchports should operate as a specific PTP port state, and BMCA management is an important part of defining network characteristics – we will look at this again in the Network Design chapter.
Finally, we look at PTP messaging; how it works, message intervals and default profiles for AES67 and SMPTE2059-2 – and how they affect BCMA events.
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