Comtech EF Data SNM-1010L - Manual (Page 166)

SNM-1010L Data/Control Modem Revision 0
Theory of Operation MN/SNM1010L.OM
6.1.2.1 User Port
The User port serial interface is a 9-pin mini-DIN female connector (DCE) on the rear
panel of the modem. The interface operates at 19.2 kbit/s, 8 data bits, no parity,1 stop bit.
The interface levels are EIA-232. The interface allows the user to configure the modem
and to request the establishment and termination of data circuits.
Note: Refer to Appendix A for a description of the software communications parameters
and detailed message format information.
6.1.2.2 Terrestrial Data Interface
The Terrestrial Data Interface is only used when the modem is operating in traffic mode.
The interface is provided via the motherboard’s 96-pin personality module interconnect,
and is part of the interface specific personality module connected to the appropriate type
of
connector (DCE) on the rear panel of the MIDAS modem. The interface levels are
software selectable between V.35, EIA-530, and EIA-449. The signal interface is
described in Chapter 2.
Refer to the Comtech EF Data Specification SP/5747 DAMA Control Channel
Messaging for a description of the software communications parameters and for detailed
message format information.
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