With vulnerabilities ever more present potentially affecting systems using GNSS as the principal source of accurate time, secondary backup sources have become increasingly critical. Addressing this issue, the ATIS SYNC group has recently completed work on a new technical report “Resilient Timing Architecture for 5G Communications Networks”.  This document considers new tools, particularly those under development at the ITU, in constructing architectural recommendations.  This paper provides details on the topics covered in this important new technical report.