Symmetricom Time Server user manual Synchronization Source Operation, Operational Non-Operational

Chapter 2: Installation and Start-Up Power-Up

2.3.4Synchronization Source Operation

Summary of Synchronization Source Operating Criteria

	Operational	Non-Operational
GPS	TimeVault has tracked at least four	TimeVault has either not been able to
	satellites during the preceding 15 minutes,	track at least four satellites during the
	and has received numerically consistent	preceding 15 minutes, or has tracked at
	date/time from them for the preceding	least four satellites but has not received
	15 minutes	numerically consistent date/time for the
		preceding 15 minutes
ACTS	TimeVault’s ACTS modem has detected	TimeVault’s ACTS modem has not
	dial tone when off-hook, has successfully	detected dial tone when off-hook, has not
	reached ACTS, and has received time	been able to reach ACTS in the preceding
	update	15 minutes, or has reached ACTS but has
		not received a time update since the last
		ACTS service
NTP	TimeVault has received a response from	TimeVault has not received any NTP data
	at least one of the NTP servers on the	packet response from any of the NTP
	user-designated server list, and has	servers of the user-designated server list
	received six valid NTP packet time	for the preceding 15 minutes.
	responses from it during the preceding
	15 minutes

During this procedure, TimeVault’s front panel display alternates between an initializing message and notification of which satellites have been newly acquired. NTP stabilization usually takes place between acquisition of the 5th and 6th satellites.

During NTP stabilization, the display reads:

Initializing

TimeVault...

Satellites

Tracked = X

where:
X	=	the number of the next satellite TimeVault acquires.

2-20 TimeVault™ User’s Manual 6000-100Ch2.fm Rev. D