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Minimum carrier bandwidth (allocated)3 Noise bandwidth (and occupied bandwidth) Composite ratec Eb/N0 at BER (rate f FEC)

a. Modems back-to-back b. Through satellite channel Transmission rate Eb/N0 at BER (rate f- FEC)

a. Modems back-to-back b. Through satellite channel C/T at clear sky

Super IBS (< 10 y 8 BER) C/N in noise bandwidth at clear sky

Super IBS (10 y 3 BER) C/N in noise bandwidth at threshold BER

64 kbps to 8.448 Mbps

10% x information rate

Rate f convolutional encoding/Viterbi decoding

Synchronous scrambler/descrambler Four-phase coherent PSK Combination of differential encoding (180°) and FEC (90°)

Clock timing must be recovered from the received data stream 0.7Rb Hz or [0.933 (IR + Overhead)] 0.6R Hz or [0.8 (IR + Overhead)] 10 y 3 10 y 4 10 y 6 10 y 8 5.3 dB 6.1 dB 7.6 dB 8.8 dB

-219.4 + 10 log10(IR + OH), dBW/K -218.1 + 10 log10(IR + OH), dBW/K -215.9 + 10 log10(IR + OH), dBW/K

-222.9 + 10 log10(IR + OH), dBW/K -220.6 + 10 log10(IR + OH), dBW/K -222.9 + 10 log10(IR + OH), dBW/K

The allocated bandwidth will be equal to 0.7 times the transmission rate, rounded up to the next higher odd integer multiple of 22.5 kHz.

bR is the transmission rate in bits per second and equals (IR + OH) times 4/3 for carriers employing rate | FEC.

cComposite data rate = (information data rate + overhead ).

Note: IR = information rate in bps. OH = overhead.

Source: Table F.2, Appendix F, INTELSAT IESS-309, Rev. 4 (Ref. 2).

TABLE 7.8 Example C-Band IBS Open-Network Transmission Parameters for Rate f FEC, INTELSAT V Through VI (About 6.7% Overhead)3
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