Comtech EF Data MIDAS Version 4.X Basic Configuration - Manual (Page 18)

MIDAS 4.2 Basic Configuration, Rev. 1
1–4 Getting
Started
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 Controller Server 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. 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 controller server.
Optional Circuit Power Management
Site-level call blocking ensures that a node does not transmit at a power level
beyond the capacity of the RF Amplifier. The system blocks circuit setup if
the total utilized power exceeds the power (less backoff) of the power
amplifier at that site, resulting in improved system stability.
For detailed information on the SNM-1002 LinkSync™ Modem, refer to the
SNM-1002 LinkSync™ Modem Operation and Maintenance Manual.