Symmetricom Time Server user manual Power-Up

Power-Up Chapter 2: Installation and Start-Up

2.3Power-Up

At power-up (cold boot), the front-panel display is blank. After about 10-12 seconds, the display reads:

TimeVault

Booting...

After another 10 seconds, the display reads:

TimeVault

Loading...

System software initialization takes about 18 seconds, after which the display reads:

Software

Load Successful

Display initialization takes another 12 seconds, after which all synchronization modes – GPS, ACTS, and NTP – simultaneously attempt to acquire and lock to their respective sources. When display initialization is complete, you can enter data through TimeVault’s front panel keypad or serial/Telnet interface. Once TimeVault has synchronized itself, then it is ready to respond to time requests it receives over the network through supported protocols.

To avoid unnecessary long distance charges, TimeVault will not call out to ACTS if a higher priority synchronization source is operational.

2.3.1GPS Mode

Consider the GPS mode operational once TimeVault tracks at least four satellites and receives ephemeris, ionospheric, and leap seconds data from each. The process of satellite acquisition is described below.

Once TimeVault starts searching for GPS satellites, the display reads:

Searching for

Satellites

Satellite acquisition may take up to 20 minutes. Display messages indicate the sequence, such as:

Satellites

Tracked = 1

6000-100Ch2.fm Rev. D TimeVault™ User’s Manual 2-17