Comtech EF Data DMD1050TS, Installation And Operation Manual

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DMD1050TS Satellite Modem Board
Revision 1
Theory of Operation 3–9 MN-DMD1050TS
3.3 Monitor & Control (M&C)
The modem’s M&C system is connected to most of the circuitry on any board in the modem.
These connections give status on the operating condition of the circuitry, as well as giving the
data required for the various measurements the modem provides. The M&C processes this
information, and generates status indications, as well as alarms, when necessary. Detailed status
information is available via the modem’s 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. It is responsible for overall command and
control of modem functions. The M&C is monitoring all subsystems of the modem constantly, by
completing a periodic poll routine. It 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 acts to minimize the effect of such faults on the system.
The DMD1050TS supports these M&C protocols:
•
Terminal Interface (Section 3.3.1)
•
Remote Port Interface (Section 3.4)
•
Web Browser (Section 3.5)
•
M&C Default/Reset Plug Settings (Sections 3.6)
•
SNMP (Simple Network Management Protocol) (See the MN-DMDREMOTEOP Remote
Protocol Manual)
3.3.1 Terminal Port/ES-ES Communications (J3)
J3 functions as the Modem Remote Port, Terminal Port or ES-ES Communications. For Terminal
port application, it supports an asynchronous control protocol. It can 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 can be monitored and controlled from this port via a common
terminal connected to the Terminal Port. This function is selected from the Web browser.
This port is also dedicated for ES-ES Communications. The port can be configured for a number
of communications protocols. Overhead data to/from the UIM is routed to/from the
framer/deframer. This port can 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 DMD1050TS 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 typically used as an
RS–232 connection to the terminal device. The RS-232 operating parameters can be set using
the modem’s Web browser, and stored in Non-volatile memory for future use. See the Remote
Protocol Manual TM117.
3.3.3 Modem Terminal Mode Control
The modem can be monitored and controlled interactively in the Terminal Mode, with a full screen
presentation of current settings and status. Programming is done 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 responds by presenting the options available and
requesting input. Two types of input can be requested. If the input is multiple choice, select the
desired choice by pressing the Space bar. When the desired option is shown, press the Enter key
to select that option. The other possible input type requires a numerical input, such as entering a
frequency or data rate.