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ROSS
If the check returns a difference and new service area is available the ROSS will initiate a
handoff sending configuration files to modem and ACU for processing of the next operational
location.
Note both modem and ACU must have valid status polls or ROSS will not initiate any service
area configurations.
Normal
This state is the "all systems are go" operating mode where connectivity to the hub is expected
because the vessel location matches a service area in the service boundary. Satellite Location
Identification Protocol (SLIP) messages and other management data is exchanged with hub
VMS, such as ROSS registration commands, modem status, and command messages. Tracking
Log entries are recorded in normal mode, and all other modes.
The transmission can be inhibited in Normal mode by:
a. ACU block signal is sent to the modem due to hazardous threshold (blockage limits).
b. Coordinated Area designates as no transmit zone
c. Vessel is inside a uncoordinated baseline (200km or set value, 0 = none, shoreline hit)
d. Carrier Inhibit, loss of hub carrier transmission, (receive data lock)
e. Modem or ACU no poll response timeout failure (~15sec) – TEK message initiated
f. Additionally the modem will mute transmit in the absences of TEK messages
Comtech EF Data, Vipersat Products
MN/13070
Page 19 of 87
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