Comtech EF Data MIDAS Version 4.X Basic Configuration - Manual (Page 43)

MIDAS 4.2 Basic Configuration, Rev. 1
Setup and Operation 2–9
AFC Setup
Click the AFC Setup button to display the AFC Settings window.
The AFC Settings window allows the
operator to configure the following
Automatic Frequency Control settings:
AFC Start Delay – this is the amount of
time that the Automatic Frequency Control
function will be delayed before starting
periodic frequency measurement and
adjustment functions. This delay is
designed to allow the oscillator crystals to
achieve operating temperature and
stabilize, therefore providing better
frequency accuracy. It also allows time for
nodes to execute their startup procedures.
NMS (Controller) Freq. Check Interval
– this setting determines how often the
NMS (Controller) will take readings of
and perform adjustments to the Inbound
Control Channel frequency.
Node Alignment
Start Time of day– this is the time of day the operator wants the Node
Alignment function to occur. The best time to perform this function is during
periods of low system traffic, to minimize slowing of the network.
Nodes per day – this is the number of nodes to be aligned per day. The system
will perform node alignment in sequential order, continuing each day from
wherever it stopped the previous day. The actual number of nodes aligned is
Nodes per day, or the total number of enabled nodes, whichever is less.
Time between – this setting determines the amount of time in between node
alignments, according to the specific needs of the operator.
Alarm threshold – this is the threshold frequency level at which an event or
alarm (as specified in the events control panel) will occur as a result of
excessive transmit frequency offset at the node, as measured by the NMS
during a periodic alignment.
Acquisition Timeout – this is the maximum amount of time that the NMS will
wait for a response from a node during node alignment, before bypassing
frequency alignment of that node.