IEEE PC37.238a
$28.00
IEEE Approved Draft Standard Profile for Use of IEEE 1588 Precision Time Protocol in Power System Applications Amendment 1: Adding a Type-Length-Value (TLV) to indicate the latest International Earth Rotation Service (IERS)-specified Universal Time Coordinated (UTC) Leap Second Event
This amendment adds another TLV to the Announce messages, containing details of the latest Leap-second event specified by the International Earth Rotation and Reference Systems Service (IERS). The fields comprise the date of the latest event, plus the total accumulated seconds offset after the event. The TLV will also indicate for how long the latest event information may be considered valid (so clocks in holdover may continue to provide UTC time for more than 12 hours after loss of a time source).
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