The Advanced Telecommunications Computing Architecture (ATCA), as defined in the PICMG 3.0 specification, is gaining wide acceptance as a platform for next-generation communications networks. ATCA is a
highly adaptable, modular and open architecture standard that reduces the development time and cost of
high-performance, high-density systems by allowing the use of standard hardware and software components
from multiple vendors.

This article addresses the fundamentals of the Synchronization Clock interface of the ATCA standard (Section 6.7 of PICMG 3.0), and discuss some of the major obstacles to overcome in order to properly distribute network synchronization in an ATCA system.