Analysis of Precision Time Protocol (PTP) Locking Time on Non-PTP Networks for Generator Locking over IP
With the integration of Internet Protocol (IP)-based systems into broadcast architectures generator-locking devices need to redesigned for this new environment. Within the SMPTE 33TS Technology Committee, an IEEE (Institute of Electrical and Electronics Engineers) 1588 profile suited for the production industry is under definition. The Precision Time Protocol (PTP) has been widely adopted in other industries to synchronize nodes in asynchronous networks such as Ethernet. If PTP is used for synchronizing broadcasting equipment replacing systems like color black, locking times of 5 sec are required to facilitate frequent changes in the network topology and offer the same availability as existing analog systems. After describing ways to obtain short lock times, measurement results are presented for a 3-hop network. Different classes of PTP-unaware components were used ranging from older-generation desktop devices to current generation data center units with line rate switching capabilities. The lock time was measured using different PTP message rates as well as default and expedited forwarding for PTP traffic while applying various network load conditions.
- Print ISSN
- 1545-0279
- Electronic ISSN
- 2160-2492
- Published
- 2014-03
- Content type
- Original Research
- DOI
- 10.5594/j18383