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DMD1050 Satellite Modem Board
processes this information and generates status indications as well as alarms when necessary.
Detailed status information is available via the modems various user interfaces including the
remote and terminal ports. An external summary fault is available on the RS422 Data interface
The M&C contains a high-performance microprocessor and is responsible for overall command
and control of modem functions. The M&C is constantly monitoring all subsystems of the
modem by performing a periodic poll routine and configures the modem by responding to
commands input to the system. During each poll cycle, the status of each of the subsystems is
collected and reported to each of the external ports. Performance statistics such as Eb/No, buffer
fill %, etc. are compiled. If faults are detected, the M&C will take appropriate actions to
minimize the effect of such faults on the system (refer to the Fault Matrices in Section 6).
The DMD1050 supports the following M&C protocols: These are:
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Terminal Interface (Section 3.3.1)
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Remote Port Interface (Section 3.4)
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Web Browser (Section 3.5)
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M&C Default/Reset Plug Settings (Sections 3.6 and 4.4.4.1)
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SNMP (Simple Network Management Protocol (Refer to TM117 Remote Protocol Manual)
3.3.1 Terminal Port/ES-ES Communications (J1)
J1 functions as the Modem Remote Port, Terminal Port or ES-ES Communications. For
Terminal port application, it supports an asynchronous control protocol. It may be configured to
support either RS-232 or RS-485 signal levels. This port is intended for use in computer-based
remote M&C. All functions of the modem may be monitored and controlled from this port via a
common terminal connected to the Terminal Port. This function is front panel selectable.
This port is also dedicated for ES-ES Communications. The port may be configured for a number
of communications protocols. Overhead data to/from the UIM is routed to/from the
framer/deframer. This port may be configured to support either RS-232 or RS-485 signal levels.
The baud rate and protocol can be selected from the Web Browser.
3.3.2 Terminal Mode Control
The DMD1050 Terminal Mode Control allows the use of an external terminal or computer to
monitor and control the modem from a full screen interactive presentation operated by the modem
itself. No external software is required other than VT-100 Terminal Emulation Software (e.g.
"Procomm" for a computer when used as a terminal. The Control Port is normally used as an
RS–232 Connection to the terminal device. The RS-232 operating parameters can be set using
the modem Front Panel and stored in Non-volatile memory for future use (refer to the Remote
Protocol Manual TM117 for setup and terminal screens).
3.3.3 Modem Terminal Mode Control
The modem can be interactively monitored and controlled in the Terminal Mode, with a full
screen presentation of current settings and status. Programming is accomplished by selecting the
item to be modified and pressing the terminal key of the option number. For example, to change
the transmit data rate, enter '33' at the terminal. The modem will respond by presenting the
options available and requesting input. Two types of input may be requested. If the input is
multiple choice, the desired choice is selected by pressing the 'Space' key. When the desired
MN-DMD1050
Revision 9
Theory of Operation
3–6
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