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Service
Data
Group
Mode Modulation Coding (1) Data Rate (2)
Data
Source
Alt Bits
or Sym (7)
Notes:
1. Decoding performed by WSC.
2. All data rates stated assuming NRZ symbol formatting. If bi-phase symbol formatting is used, data rate
maximums must be reduced by a factor of 2. Note that bi-phase symbol formatting is not necessarily supported
for every service configuration stated in this table.
3. Applicable to SMAR only.
4. Equipment will also be capable of supporting an I channel with no data present i.e., just the “long” PN code on
the I channel.
5. DG2 maximum supported data rates based upon very full use of a 10 MHz customer allocation for SSAR service,
a 300 MHz customer allocation for KuSAR and KaSAR-225 MHz service, and an 800 MHz customer allocation
for KaSAR-650 MHz.
6. This is the total data rate when dual data source.
7. Applicable to single data source only.
8. 8PSK with rate 1/2 LDPCC service modes is under consideration for deletion. Contact the SN Project Office to
determine its status if this modulation/coding combination is deemed needed by the customer.
Table S-3. KaSAR-650 MHz Data Service Customer Signal Distortion Constraints
Parameter (Note ) Requirement (Note )
Minimum channel state symbol transition density
Consecutive I-channel or Q-channel channel state
symbols without a state transition
Channel state symbol asymmetry (peak) ≤ ± 3 percent
Channel state symbol jitter and jitter rate ≤ 0.1 percent
Phase imbalance
≥ 128 randomly distributed channel state symbol
transitions within any sequence of 512 channel state
symbols
≤ 64 channel state symbols
a. BPSK/QPSK/SQPSK ≤ ± 3 degrees
b. 8-PSK ≤ ± 2 degrees
Gain imbalance ≤ ± 0.25 dB
Phase nonlinearity (peak) ≤ 6 degrees over ± 230 MHz
Gain flatness (peak) ≤ 0.6 dB over ± 230 MHz
Gain slope ≤ 0.1 dB/MHz over ± 230 MHz
AM/PM ≤ 6 degrees/dB
Noncoherent frequency stability (peak)
(± 300 kHz customer oscillator frequency uncertainty)
1-sec observation time ≤ 3 x 10 -9
Lifetime ≤ 1.1 x 10 -5
Incidental AM (peak)
a. For open-loop pointing at frequencies ≥ 100 Hz ≤ 5 percent
b. For autotrack performance
At frequencies: 10 Hz – 10 kHz ≤ 3 percent
At frequencies: 10 Hz – 2 kHz ≤ 0.6 percent
Revision 10 S-8 450-SNUG