Supports Stratum 2 stability in holdover mode Supports reference switchover with phase build-out Supports hitless reference switchover Auto/manual holdover and reference switchover 4 pairs of reference input pins with each pair configurable as a single differential input or as 2 independent single-ended inputs Input reference frequencies from 1 Hz to 750 MHz Reference validation and frequency monitoring (1 ppm) Programmable input reference switchover priority 30-bit programmable input reference divider