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ROSS
1.1
Introduction
Comtech EF Data has developed Satellite On The Move (SOTM) technology that provides a
global coverage method of satellite hopping dynamically to maintain communications and
extend the advantages of switched Single Channel Per Carrier (dSCPC) within a Vipersat
network. This method allows a mobile remote satellite station on-board a roaming oceanic vessel
to transition between satellite or hub coverage connections with minimal service interruption.
The key components to this technology are hub and remote satellite modems, a stabilized mobile
antenna system for tracking GEO satellites, a central management system maintaining the
alliance of the remote satellite network communication links, and a mobility controller with
multiple location codes of satellite service areas.
The Vipersat Roaming Oceanic Satellite Server (ROSS) fills the role of the satellite mobility
controller. In conjunction with an Antenna Control Unit (ACU), the ROSS performs satellite
antenna re-point and information gathering. When a transition requirement is identified, the
ROSS will push new pointing information to the ACU and provide the new transmission
parameters to the CDM-IP modem that are required for service area handoff.
1.2
Overview
The ROSS is one of the key components in the Comtech EF Data mobile satellite solution
system that provides the capability to automatically transfer remote sites from one satellite
connection to another as the mobile vessel moves between multiple satellite coverage areas. In
addition, the ROSS provides alternate configuration files for the modem that can be mapped to
specific regions of a satellite's coverage area or ground station equipment. This allows
communication link parameters, such as data rate and modulation, to be optimized for the
satellite reception in that region.
A typical interconnect diagram for the ROSS as deployed aboard ship in a mobile remote
satellite application is shown in figure 1. Please note that the example in figure 1 uses a generic
device name antenna control unit (ACU). All references to antenna controller unit (ACU) are
refer to vendor neutral ACU. See appendices for supported ACU types.
Comtech EF Data, Vipersat Products
MN/13070
Page 9 of 87
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