Remote interface specification, M&c theory of operation, Remote interface configuration – Comtech EF Data SNM-1001 User Manual
Page 41: Modem defaults, 2 remote interface specification, 3 m&c theory of operation, 4 remote interface configuration, 5 modem defaults

Theory of Operation
SNM-1001 Network Control Modem
4–10
Rev. 1
4.3.2
Remote Interface Specification
Refer to Appendix A for the remote interface specification.
4.3.3
M&C Theory of Operation
The M&C module is built around the Intel 80C32 micro-controller, operating at
11.0592 MHz. The microsystem is designed to support up to 512 kbytes of read-only
code memory, and up to 32 kbytes of non-volatile random-access data memory.
4.3.4
Remote Interface Configuration
All modem functions can be remotely controlled and monitored via an EIA-232-C
communications link. The EIA-232-C interface is used to communicate with a single
modem.
For M&C jumper settings, refer to Table 4-1.
4.3.5 Modem
Defaults
The M&C has default settings that are loaded into the modem at power-up. These default
settings are also loaded each time the modem has been hard reset. The following tables
list the defaults settings for each modem configuration parameter.
Defaults for Burst Mode
Modulator Defaults
Demodulator Defaults
Data Rate
A
Data Rate
A
TX Rate A
19.2 kbit/s, QPSK
RX Rate A
19.2 kbit/s, QPSK
TX-IF Frequency
70 MHz
RX-IF Frequency
70 MHz
TX-IF Output
ON
Descrambler
ON
Mod Power Offset
0 dB
Differential Decoder
OFF
TX Power Output
-10 dBm
Demodulator Type
INTELSAT Open
Scrambler
ON
Decoder Type
Viterbi, 1/2 Rate
Differential Encoder
OFF
IF Loopback
OFF
Modulator Type
INTELSAT Open
RF Loopback
OFF
Encoder Type
Viterbi, 1/2 Rate
BER Threshold
None
CW Mode
Normal (OFF)
Interface Defaults
System Defaults
TX Clock Source
TX TERRESTRIAL
Time
12:00 AM
TX Clock Phase
NORMAL
Date
7/4/76
RX Clock Phase
NORMAL
Baud Rate
9600
Baseband Loopback
OFF
Parity
Even
Address
1
Operation Mode
Duplex