TYMSERVE 2000
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 Timestamp ( 64 bits )
Originate Timestamp ( 64 bits )
Receive Timestamp ( 64 bits )
Transmit Timestamp ( 64 bits )
Authenticator ( optional ) ( 160 bits )
Figure 3-1: NTP Message Data
Leap Indicator (LI): This is a two-bit code warning of an impending leap second to be
inserted/deleted in the last minute of the current day, with bit 0 and bit 1, respectively, coded as
follows:
00: no warning
01: last minute has 61 seconds
10: last minute has 59 seconds
11: alarm condition (clock not synchronized)
When the TYMSERVE 2000 is first powered on (i.e. before time is initially acquired from the
timing signal) and when the timing parameters are changed, the alarm condition will be
indicated. This condition will persist until the TYMSERVE acquires time and should not be set
again until the unit is powered off and on.
Version Number (VN): This is a three-bit integer indicating the NTP version number. The
TYMSERVE will return the version number from the incoming NTP message.
Mode: This is a three-bit integer indicating the mode. For the TYMSERVE this field is set to
four (4) indicating the server mode. The TYMSERVE always operates in server mode which
means that it will synchronize hosts but will never be synchronized by hosts.
Stratum: This is an eight-bit integer indicating the stratum level of the local clock. For the
TYMSERVE 2000 this field is set to one (1) indicating a primary reference.
Poll Interval: This is an eight-bit signed integer indicating the maximum interval between
successive messages, in seconds to the nearest power of two. The TYMSERVE will return the
poll interval from the incoming NTP message.
Precision: This is an eight-bit signed integer indicating the precision of the local clock, in
Datum Inc, Bancomm Div. TYMSERVE 2000 Manual
xvii
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General