User's Manual

56 ALFOplus 24GHz (North America) - Release 01.05.0x - MN.00395.E - 004
Internally to each SIAE equipment the SETS identify the input and output types of interfaces by the fol-
lowing codes:
• TE: This code represents an Ethernet interface (LAN) used as input CK
• T0: Output interface. This code represents the Internal Clock
The purpose of the above list is to list the different acronyms used by the SETS that may be present in the
configuration screens.
There are some features to be used for maintenance or refined tuning of the clock propagation.
Fig.22 - Synchronisation menu
Here below are listed the different configurations to be made:
• Status Control: this is a forced status for maintenance purposes of the SETS. It can be forced in:
- “Free Running”: Independently from the synchronization signal received, the clock is locked onto
the internal clock.
- “Hold Over”: The SETS is locked into the internal clock which tries to preserve the frequency
received when the SETS was locked.
- “Locked”: in this case the SETS is locked to a source of synchronization.
• “Time” Settings: these are general setting for the synchronization
- “Hold Off Time”: Time (expressed in ms) during which the system keeps the evaluated frequen-
cy of a synchronism source become invalid (not present or degraded). At the end of the Hold
Off time, the invalid source will be rejected and the first input source having a valid signal will
be used.
- “WTR Time”: i.e. Wait-To-Restore, this is a wait time to avoid oscillations. Time (expressed in
minutes) that has to pass before allowing the selected valid input source to be actually used
within the process for the selection of T0 synchronism.
• “LTI Set Time” and “LTI Reset Time”: are controls that avoid oscillations of Alarms. When one alarm
raises up, it has to be active for at least the “LTI Set Time” and when it disappears it has to be off
for at least “LTI Reset Time”.
• “Enabled”: Enables the SSM in the equipment