As the industry transitions from SDI based production to an all-IP studio environment progresses, some of the finer points related to a smooth migration such as Time & Sync are capturing more attention from the early adopters. Phase & frequency alignment of baseband signals are a critical element in media production. In the IP world, the required functionally is delivered via the IEEE 1588 Precision Time Protocol (PTP) specification. Whilst having enabled many industries to transfer their synchronisation requirements via PTP to the IP centric environment, special care needs to be taken for each specific industry and its specific constraints. This paper draws on the extensive research the authors have carried out on the use of PTP for the media production industry. It summarises their work on areas such as how PTP aware vs. non-aware networks behave under load, IP Quality of Service for PTP messages and Grand Master redundancy models. Concluding with the impact of design con-siderations, network architecture constraints and device requirements for a successful all-IP synchronised media production facility.
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