Comtech EF Data SDM-309B - Manual (Page 22)

SDM-309B Satellite Modem Introduction
MN/U-SDM309B Rev. # 1-1–9
Configuration Retention Will Maintain Current
Configuration for 30 days
Minimum Without Power
Addressing Programmable to 1 of 256
Possibilities
Address 0 Reserved for Global
Addressing
Local Control of All Remote Functions Included Via Pushbutton Entry.
Table 1-2 BER Performance Specification
Note:
The bit energy-to-noise ratio (Eb/N0) required to achieve 10 -3 to 10 -8 bit error rates at
various data rates for different coding configurations is shown below. All values are for
operation in QPSK mode. The modem alone, without coding, provides operation within
0.5 dB of theoretical for BPSK and within 0.8 dB for QPSK, for BER’s in the range 10-1
to 10-6. Performance measurements are with Transmit and Receive IF connected back to
back through an additive white gaussian noise channel.
Viterbi K=7
1/2 Rate 3/4 rate
BER
10-3
4.2 dB 5.3 dB
10-4 4.7 dB 6.0 dB
10-6 6.1 dB 7.6 dB
10-8 7.2 dB 8.8 dB