Edge computing for AI autonomy and resilient systems demands sub-nanosecond timing synchronization, surpassing traditional ITU-T G.703 10 MHz clock and standalone 1PPS interfaces for clock distribution. This talk introduces the Embedded Pulse-Per-Second (EPPS), proposed as Annex C to ITU-T G.703, embedding a 1PPS phase-synchronization marker into the 10 MHz clock using a 25% duty cycle modulation (25 ns high, 75 ns low) at the 1PPS boundary. With ±10 ns alignment, <100 ps jitter, and <500 ps transition times (40-60% amplitude) over 50 Ω interfaces with 3 m cabling, EPPS achieves “epsilon”-level precision, complying with G.703 clause 20.2 and Table 19-4 for unified phase and frequency distribution. EPPS extends to edge ecosystems via PCI-SIG CEM 7.0 (draft) and OCP NIC 3.0 standards. PCI-SIG CEM reassigned JTAG pins as FlexIO pins in prior specifications, with some allocated for USB 2.0; CEM 7.0 proposes Timing Synchronization on unallocated FlexIO pins to bi-directionally distribute 1PPS or EPPS, enabling precise timing for AI accelerators in GPU clusters. OCP NIC 3.0 repurposes FlexIO pins for a bi-directional Timing Synchronization interface (including independent frequency and phase/time distribution; important for Telecom), propagating 1PPS and 10 MHz signals to digital phase-locked loops with sub-nanosecond accuracy, supporting Telecom and OCP configurations. The talk proposes a unified timing framework, including standards synergy for precise clock distribution across ITU-T, PCI-SIG, and OCP.