Comtech EF Data RCS10 - Manual (Page 224)

Principles of Operation RCS10 Redundant Communication System
Page 5-8 TM058 - Rev. 2.3
The TX CLK PHASE should be set to AUTO.
G.703 Interface
If the G.703 interface is selected, then the Tx clock source must be set to SCTE and the TX CLK
PHASE should be set to AUTO.
Receive
Select the Buffer clock to SCR.
5.7 Monitor & Control Subsystem
Also contained on the Baseband Card is the Monitor and Control (M&C) subsystem. The M&C
contains a high-performance Motorola 68302 microprocessor and is responsible for overall
command and control of all DMD10 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 and front panel. 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 Troubleshooting
Section of this manual).
The M&C subsystem contains the following features:
Asynchronous serial port #1: This port is dedicated to the terminal program. With this program,
all features of the modem may be controlled and monitored by any
common terminal connected to the terminal port.
Serial Port #2: This port is dedicated to the modem remote port. This port may be
configured to support a number of synchronous or asynchronous
protocols such as HDLC, and RS-485. This port is intended for
use in computer-based remote monitor and control. All functions of
the modem may be monitored and controlled from this port.
Serial Port #3: This port is 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.
Clock: The time and date is kept in order to ‘time-tag’ system events.
Watchdog Timer: The Watchdog Timer monitors the health of the M&C subsystem.
Program Flash ROM: The 512K of reprogrammable program ROM (expandable to 1MB)
is available to the M&C.
RAM: 128K RAM (expandable to 512K)
Non-Volatile RAM: 8K of non-volatile RAM (expandable to 32K) is provided in order to
hold the modems current configuration. In case of interruption of
power, the M&C will reconfigure the modem identically to the state
before power was lost.
5.8 Universal Modem
The Universal Modem (UM) card contains a complete variable-rate Modulator/Demodulator intended
for satellite communications. The UM utilizes the latest digital technology for high reliability and
versatility. The Modulator and Demodulator sections may be configured independently under
processor control. The UM includes a dual band 70/140 MHz IF, QAM Modulator/Phase Lock