Symmetricom Time Server - Manual (Page 33)

6000-100Ch2.fm Rev. D TimeVault™ User’s Manual 2-19
Power-Up Chapter 2: Installation and Start-Up
2.3.2 ACTS Mode
Consider the ACTS mode operational once TimeVault has successfully dialed out to the
ACTS service and received time (see Appendix E for details).
2.3.3 NTP Mode
TimeVault’s NTP subsystem can be either a server to downstream clocks in the system, or
a client to another NTP server. After display initialization, TimeVault begins requesting
time through NTP from a user-defined server list. TimeVault polls each server in turn
until it receives a valid NTP response. Consider the NTP client mode operational once
TimeVault receives six valid NTP responses from at least one NTP server from the list.
This may take 8-10 minutes.
If the number of current satellite signals
drops to 1 or 2, the unit uses GPS as refer-
ence source for 10 minutes. If the number of satellite signals drops to
zero, the unit keeps GPS as the reference
source for 5 minutes while it locks onto
another GPS satellite signal.
Table B.1: Summary of Firmware Version 8 Improvements
Version 7 and earlier Version 8 and after
TimeVault only enters ACTS mode if GPS is not operational.
TimeVault only enters NTP mode if both GPS and ACTS are not operational.