Comtech EF Data SNM-1010L - Manual (Page 165)

SNM-1010L Data/Control Modem Revision 0
Theory of Operation MN/SNM1010L.OM
6.1.1 Specifications
Refer to the following listing for specifications.
Physical Size 5.3 x 7 inches (13.46 x 17.78 cm)
The DAC board fits into the SNM-1010L 1RU chassis.
Power Requirements +5 VDC
Operating Temperature 0 to +50 ° C (32 to 122° F)
6.1.2 Theory of Operation
To ensure a high level of integration and DOS compatibility with I/O peripherals, the
DAC uses the Intel 80386EX embedded microcontroller. This 16/32 bit microcontroller
performs DAMA controller functions (and other functions) under control of a real time,
multi-tasking operating system.
The DAC uses non-volatile configuration memory with unlimited read/write access to
satisfy memory reconfiguration requirements. Flash ROM is used for program storage.
NVRAM storage maintains the configuration parameters during power-down conditions.
HDLC synchronous serial ports are implemented with a Z85230 serial communications
controller device. This device supports the modem control channel satellite channel
interface and the HDLC external serial port.
The 80386EX DMA channels are used for the satellite channel interface receive
functions. Additional asynchronous ports are implemented with 16C450/16C550
compatible UART devices, to provide M&C of modems under the modem,
via either the modem microcontroller or a PC.
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