Symmetricom Time Server Manual Do Utilizador

Appendix A: NTP Version 3, NTPQ, and NTPDC

When TimeVault replies to requests from SNTP clients, the packet format is the same as 
the NTP packet format described above, with the following differences:

• Leap Indicator

TimeVault sets these 2 bits to either 0 (normal) or 3 (unsynchronized) only

• Version Number

TimeVault copies this field from the client request packet and returns it in this field.

• Reference Timestamp

This field is set to the time that the reply left TimeVault’s server host.

• Receive Timestamp

This field is set to the time that the reply left TimeVault’s server host.

• Transmit Timestamp

This field is set to the time that the reply left TimeVault’s server host.

• Authenticator

This field is not used in SNTP.