Comtech EF Data SNM-1002 - Manual (Page 95)

4–1
Chapter 4. THEORY OF
OPERATION
4.1 LinkSync™
LinkSync™ is a unique MIDAS feature providing:
• Automatic Frequency Control (AFC)
• Uplink Power Control (UPC) at the MIDAS Controller
• Circuit Power Management (Option)
! Site level call blocking based on HPA power
4.1.1 Automatic Frequency Control
MIDAS provides automatic frequency control (AFC) to reduce the traffic modem
acquisition time for continuous mode operation and to improve the burst acquisition
performance of the SNM-1000/1001 Network Control Modem and the Node Control
Modems
1
, by keeping the frequency drift to within
± 500 Hz.
The outbound control channel is used as the system-wide reference, which is
continuously monitored by the LinkSync™ Modem at the MIDAS Controller site and all
the Node Control Modems
2 . The AFC process does not depend on the absolute accuracy
in any part of the system.
1
Includes SNM-1000 and the integrated traffic/control modems (SNM-1010 and SNM-1010L).
2
The integrated traffic/control modems and the network terminals in a standard configuration
monitor the outbound control channel in the “control mode”.