9 LTOS7 Management and Monitoring
How do I configure the correct Trusttime in my application environment?
As an example, we now assume that our receiver has a built-in TCXO oscillator. The Trusttime should run out
from an offset of 1ms. The graphic shows that this offset is reached after 10 hours of holdover time. Therefore
a Trusttime of 10 hours should be configured.
Procedure: First you should find out which oscillator is used. Go to the web interface menu "Monitoring
and Management
→
Clock
→
??
→
Oscillator Type". Then you can define an offset, from which the NTP
should lose its stratum or the trust time.
A list of oscillators available for Meinberg reference clocks:
https://www.meinbergglobal.com/english/specs/gpsopt.htm
Local Trusted Keys
In this field, you can enter the IDs of the symmetric keys which shall be used for the authentication. If you
have more than one key, the IDs need to be entered with a space to separate them from one another. You can
configure the symmetric keys in the submenu "NTP Symmetric Keys" on the NTP page. See "NTP Symmetric
Keys" sub chapter for more information.
LANTIME CPU Expansion Shelf
Date: 2nd July 2020
75
Summary of Contents for LCES
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