Comtech EF Data MIDAS Version 4.X NMS Configuration - Manual (Page 16)

MIDAS 4.X NMS Configuration , Rev. 6
1–4
Introduction to MIDAS NMS
LinkSync™ is a unique MIDAS feature that provides:
Automatic Frequency Control (AFC)
The AFC process compensates for earth station frequency drift due to
hardware aging and/or other factors, reducing the frequency uncertainty for
control and traffic channels. This compensation allows for faster call setup and
tighter carrier placement.
Uplink Power Control (UPC) at the NMS site
The UPC process dynamically adjusts the transmit power for the outbound
control channel, thereby allowing a constant power level to be received by the
downlink from the satellite. This adjustment makes it possible for the
outbound control channel to be used as a reference.
Circuit Disruption
MIDAS supports a family of single-channel traffic nodes using combined
control channel and traffic modems, such as the SNM-1010/1010L. These
nodes communicate on the control channel when no data circuit is active, and
reprogram themselves to become a traffic modem when the circuit is activated.
In the event that the network, or the network operator, needs to terminate or
preempt a circuit between two of these nodes, the LinkSync modem is used to
generate a carrier that forces the two nodes to lose carrier lock. This circuit
disruption causes the two nodes to reprogram themselves as control channel
modems and resume communication with the NMS.