Comtech EF Data SNM-1000 - Manual (Page 26)

SNM-1000 Node Control Modem Revision 3
Introduction MN/SNM1000.IOM
1-6
1.4 Specifications
This section includes the following specifications:
• General Specifications
• Environmental and Physical Specifications
• DAC
• Burst mode operating specifications
• Continuous mode operating specifications
• Bit Error Rate (BER) specifications
1.4.1 General Specifications
Table 1-1. General Specifications
Parameter Specification
Operating IF Range 50 to 180 MHz, in 1 Hz steps
Digital Data:
Burst Mode Transmit (Slotted Aloha)
TX Data Rate
Continuous Mode Receive
RX Data Rate
TDMA
19.2 kbps
TDM
19.2 kbps
Symbol Rate 19.2 kHz
Modulation QPSK
Forward Error Correction
Viterbi, K=7, 1/2 rate
Data Scrambling IESS-308 (V.35), IESS-309, or None
External Reference 1, 5, 10, 20 MHz
Plesiochronous Buffer 16 bits to 256 kbps, in 16 bit steps
2 to 98 ms, in 2 ms steps
Modulator
Output Power
-5 to –30 dBm, adjustable in 0.1 dB steps
Output Spurious < -55 dBc, 0 to 500 MHz (4 kHz in-band)
Output Harmonics < -55 dBc, 0 to 500 MHz (4 kHz out-of-band)
Output Spectrum Meets IESS-308/309 power spectral mask
Output Return Loss > 20 dB
Output Impedance 75
Ω (Optional: 50 Ω)
Output Frequency Stability
± 10 PPM
Data Clock Source Internal or External
External Clock:
± 100 PPM and < 5% jitter
Internal Clock:
± 10 PPM
Internal Stability
± 1 x 10 -5