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ROSS
3.1.3 Modem Configuration File
This is a standard modem parameter file that is currently used by all Vipersat enabled Comtech
modems, such as the CDM-570L or SLM-5650A. It is a proprietary formatted text file. This file
contains configuration parameters that allow the modem to establish communications with a
specific satellite. In other words, each modem configuration file is created for a specific satellite
and hub ground station and contains all possible parameters values for the base modem and IP
router interface card. The Service Area database associates this modem configuration file with a
specific satellite and hub network. The file transfer uses the Comtech proprietary Streamload
protocol for ROSS to push a new configuration updates. Upon complete reception the modem
stores and processes the new changes issuing a firm reset to initialize the new changes. The new
updates are accomplished without a reboot minimizing the transitioning time.
Critical parameter categories include:
• RF properties such Tx and Rx home state frequencies, FEC rate, modulation, data rates,
and baseline transmit power.
• STDMA burst map configuration
• Route table configured for specific network topology if required
• QoS rules for setting unique priorities and bandwidth
Modem Parameters Excluded by ROSS:
• IP Address – Modem IP communication address remains static
• Network Node ID – Defines unique flow ID assigned by controlling VMS
Modem Parameters Replaced by ROSS:
• Satellite ID – derived by ROSS per service area
Exclusions and Replacements are necessary in providing seamless association between user
unknown values and possible unwanted overwrites. All the configurations for the modem are
stored in a single directory and are associated to its service area by sequential numbered file
naming convention.
Comtech EF Data, Vipersat Products
MN/13070
Page 21 of 87
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