A read-only CwrUpdateTime, in seconds since power-up, recording when this head-end 1-second channel statistics row was last refreshed. It confirms whether the accompanying per-second codeword counts for this channel are genuinely current, similar in purpose to the subscriber-unit-side update-time objects but scoped to the head end's channel. For example, an admin polling the head end's per-channel statistics would check p2mpHe1SecUpdateTime advancing each second to confirm the channel-level counters are actively refreshing.