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S100 User Guide – Rev. D – June 2005 91
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Leap Indicator (LI)
This is a two-bit code warning of an impending leap second that will be inserted or deleted in
the last minute of the current day, with bit 0 and bit 1, respectively, coded as follows:
Figure 5-42: Two-bit Leap Second Indicator Code
You are alerted to an alarm condition when the S100 is first powered on—in other words,
before time is initially acquired from the timing signal. An alarm condition will also signal when
the timing parameters are changed. This alarm condition will persist until the S100 acquires
time. It should not signal again until the unit is powered off and on.
Version Number (VN)
This is a three-bit integer indicating the NTP version number. The S100 will return the version
number from the incoming NTP message.
Table Intro-1: NTP Message Data
LI VN MODE Stratum Poll Precision
Synchronizing Distance (Root Distance) (32 bits)
Synchronizing Dispersion (Root Dispersion) (32 bits)
Reference Identifier (32 bits)
Reference Time Stamp (64 bits)
Originate Time Stamp (64 bits)
Receive Time Stamp (64 bits)
Transmit Time Stamp (64 bits)
Authenticator (Optional) (96 bits)
0 8 16 24 31