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APPENDIX A
NTP v 3.0 DATA FORMAT per RFC1305
A-1
NTP DATA PACKET
A-1.1
The layout of the NTP data packet information following the UDP header is shown below.
Leap
Indicator
Version
Number
Mode
Stratum
Poll
Precision
Synchronizing Distance (Root Delay Version 3)
Synchronizing Dispersion (Root Dispersion Version 3)
Reference Clock Identifier
Reference Timestamp
Originate Timestamp
Receive Timestamp
Transmit Timestamp
Authenticator
Leap Indicator
A-1.2
The leap indicator is a 2 bit code which signals an impending leap second to be added or
subtracted in the last minute of the current day. Leap year codes and their
corresponding meanings are shown in the table below.
Bit 0 Bit 1
Meaning
0
0
Normal Operation
0
1
61 second last minute
1
0
59 second last minute
1
1
Clock not synchronized
A-1.3
The unsynchronized state is indicated by the NTS-100 whenever the estimated
synchronization error is greater than the root dispersion. Such conditions typically occur
following turn-on, until synchronization with the external source has been achieved, and
whenever the external synchronization input has been removed and the extrapolated
time error has exceeded the value of the root dispersion.
Version Number
A-1.4
The version number is a three bit integer which specifies the NTP version. The NTS-100
will copy this field from the client requesting packet and return it in this field if it is equal
to either 2 or 3. NTP version 1.0 packets are not supported.
Содержание IRIG NTS-100
Страница 1: ...Network Time Server IRIG NTS 100 600 201 SERIAL NUMBER_______________ Revision A January 20 1997...
Страница 42: ...1 20 97 N NT TS S 2 20 01 1 M MA AN N 4 4 1 1 R Re ev v A A 4 SECTION IV NOT USED...
Страница 75: ...1 20 97 N NT TS S 2 20 01 1 M MA AN N C C 1 1 R Re ev v A A APPENDIX D DETAILED DRAWINGS BILL OF MATERIALS...
