Comtech EF Data SDM-300A - Manual (Page 383)

SDM-300A Satellite Modem Revision 6
Specifications MN/SDM300A.IOM
19–27
19.8.2.12 Receive Doppler/Plesiochronous Buffer Size
The RX Doppler buffer size can be set by the operator from:
• Bypass.
• 32 to 262,144 bits, in 16 bit steps.
• Selectable in ms, from 2 to 98 in 2 ms steps, based on the data rate.
• Selectable Frame Format G.704 or None.
19.8.2.13 Buffer Centering
The operator can set the buffer to 50% .The modem will automatically set the buffer to 50%
after receive signal acquisition or a buffer overflow/underflow.
19.8.2.14 Switch Faults
Modulator Fault Open collector output, 15V maximum, 20 mA maximum current
sink, fault is open circuit.
Demodulator Fault Open collector output, 15V maximum, 20 mA maximum current
sink, fault is open circuit.
19.9 Terrestrial Interface Types
19.9.1 Universal
The following interface types are available through the EIA-530 25-pin data I/O connector.
• EIA-232
• V.35
• EIA-422, MIL-188-114A
Optional mechanical interfaces are also available. See Chapter 5 for pinout information.
• 37-pin D (EIA-449)
• 34-pin Block (V.35)
• 50-pin D
• G.703 with DB9 and BNC (Closed Network with ASYNC)
• Eurocomm