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DMD50 Universal Satellite Modem
Control and status messages are conveyed between the modem and all subsidiary modems and
the host computer using packetized message blocks in accordance with a proprietary
communications specification. This communication is handled by the Radyne Link Level Protocol
(RLLP), which serves as a protocol 'wrapper' for the RM&C data. Complete information on
monitor and control software is contained in the following sections.
4.8.1 Protocol Structure
The Communications Specification (COMMSPEC) defines the interaction of computer resident
Monitor and Control Software used in satellite earth station equipment such as modems,
redundancy switches, multiplexers, and other ancillary support gear. Communication is bi-
directional, and is normally established on one or more full-duplex 9600-baud multi-drop control
buses that conform to EIA Standard RS-485.
Each piece of earth station equipment on a control bus has a unique physical address, which is
assigned during station setup/configuration or prior to shipment. Valid decimal addresses on one
control bus range from 032 through 255 supporting up to 224 devices per bus. Address 255 of
each control bus is usually reserved for the M&C computer.
4.9 Ethernet Remote Port Interface (SNMP & Web Browser)
This port is dedicated for Ethernet Communications supporting SNMP, FTP and Web Browser.
The port is configured for 10 Base-T communications protocols. The Ethernet M&C Interface
requires a standard RJ45 Male connector.
Refer to Appendix D and F for proper setup of the TCP-IP interface and Web Browser
Refer to the Remote Protocol Manual TM-117 for SNMP MIB and Web Browser Menus
TM118 – Rev. 1.1
Setup.
User Interfaces
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