Symmetricom Time Server user manual Acts Mode

Power-Up		Chapter 2: Installation and Start-Up
	Table B.1: Summary of Firmware Version 8 Improvements
	Version 7 and earlier	Version 8 and after
	If the number of current satellite signals	If the number of satellite signals drops to
	drops to 1 or 2, the unit uses GPS as refer-	zero, the unit keeps GPS as the reference
	ence source for 10 minutes.	source for 5 minutes while it locks onto
		another GPS satellite signal.

2.3.2ACTS Mode

Consider the ACTS mode operational once TimeVault has successfully dialed out to the ACTS service and received time (see Appendix E for details).

TimeVault only enters ACTS mode if GPS is not operational.

2.3.3NTP 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.

TimeVault only enters NTP mode if both GPS and ACTS are not operational.

6000-100Ch2.fm Rev. D TimeVault™ User’s Manual 2-19