Televes OLT 769401, User Manual

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Descripción del producto
74
Reversibility Time
Time, measured in seconds, after which, the fault condition disappears. After this time, the invalid
source will be reconsidered for synchronization. This time is considered after the Wait-To-Restore time
has elapsed
Holdover Message
Delay
Time, in milliseconds, considered in the case where the equipment is in Holdover mode. This state is due
to a fault condition in the selected synchronization source and when there is no other available source.
QL (Quality Level) will be in QL_SEC when the delay is between 300ms and 2000ms (corresponding to
the range of values for this parameter);
Switching Message
Delay
Delay, in milliseconds, applicable in the case where changing to another synchronization source is
carried out with a different Quality Level value. This delay sets the elapsed time between the trigger of
the new synchronization source and a change in the output Quality Level. The range of values for the
Switching Message Delay is between 180ms and 500ms
Minimum Quality
Before Squelch
Minimum quality value; The equipment will squelch the synchronization source if there is no other
source with a quality level equal to or better than the selected source;
Send Value after
Quality Unknown
Value to be sent if Quality Unknown; The equipment will make the SSM output with the respective
Quality Level configured if there is no synchronization source with a Quality Level other than Quality
Unknown. The quality level SSM is selected from a combo box, Error: No se encuentra la fuente de
referencia. The meaning of each selectable message is described in table Table 5-.
Free-run Source
Free-run Source; With this option selected, the system always synchronizes with its internal clock (array
unit PLL).
Table 5-12: Synchronism Configuration parameters table
Figure 5-27: Synchronism Status Message Combo Box
SSM Description
PRC-G.811
The synchronization source is a PRC clock, according to G.811 recommendation
SSU-A
The synchronization source is an SSU clock (Synchronization Supply Unit), type I or
IV, according to G.812 recommendation.
SSU-B
The synchronization source is an SSU clock (Synchronization Supply Unit), type VI,
according to G.812 recommendation
SEC
The synchronization source is a SEC clock, according to G.813, Option I
recommendation.
DNU
The source should not be used for synchronization.
Table 5-13: Synchronization Status Message from the synchronization sources