
SRG-4500 User Guide (v7.0)
NTP Option • 131
Keep the following mind:
• The time-code needs to be checked and updated each time the NTP Server is detected.
• However in marginal networks the “question-response” message times may be so variable the time-code update
should be suppressed until it has been valid for a number of seconds.
• Once the time-code has been set by the NTP Client, the SRG-4500 should not need to re-check the NTP time
unless a crash lock has been forced by the phase locking arrangement.
Simplified NTP Flowcharts
No frequency or phase can be accurately inferred from the NTP system.
Figure 15.2 NTP Client Flowchart
Poll Server
Set NTP Lock to Lost
YES
Is the
Poll Timer
set to 0?
NO
YES
Is the NTP
Lock set to
Locked?
NO
NO
Is the
Measured
Time Delay <
Threshold?
NO
Is the
GPS Solution
OK?
NO
Is the NTP
Lock set to
Locked?
YES
YES
YES
Lock SRG-4500 to NTP and
Set NTP Lock to Locked
NO REPLY
REPLY OK
MISSED 5
REPLIES
Set Poll Timer
Set NTP Lock to Never
Содержание 4500DR-104-07
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