Symmetricom S100 manual Mode, Stratum Poll Precision, Leap Indicator LI, Version Number VN

Table Intro-1:NTP Message Data

0		8			16	24	31
	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)

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.

S100 User Guide – Rev. D – June 2005 91