Symmetricom Time Server Manual de usuario descargar pdf (Pagina 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.

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Symmetricom Time Server Manual de usuario Pagina 33