Q-Flex Satellite Modem Installation and Operating Handbook
12-2
Audio Channels Option
Used with IBS and IDR to provide 2 x 32kbps audio
ADPCM coded channels within a 64kbps IBS carrier and 2
x 32kbps audio ADPCM coded channels plus 64kbps data
within a 128kbps IBS carrier
Inner Forward Error
Correction
DVB-S2 (LDPC/BCH) (EN 302 307):
QPSK 1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9, 9/10
8PSK 3/5, 2/3, 3/4, 5/6, 8/9, 9/10
16APSK 2/3, 3/4, 4/5, 5/6, 8/9, 9/10
Non-DVB-S2:
FastLink Low-Latency LDPC option:
BPSK 0.499
(O)QPSK 0.532, 0.639, 0.710, 0.798
8PSK/8QAM: 0.639, 0.710, 0.778
16APSK/16QAM: 0.726, 0.778, 0.828, 0.851
32APSK: 0.778, 0.828, 0.886, 0.938
64QAM: 0.828, 0.886, 0.938, 0.960
TPC option:
BPSK 5/16, 21/44, 2/3, 3/4,
Rate 7/8 (de facto)
(O)QPSK: 5/16, 21/44, 2/3, 3/4,
7/8 (de facto), 0.93 (Paradise)
8PSK: 3/4 de facto, 7/8 (de facto),
0.93 (Paradise)
16QAM: 3/4 (de facto), 7/8 (de facto),
0.93 (Paradise)
Viterbi: BPSK/(O)QPSK 1/2, 3/4, 7/8
TCM: 8PSK 2/3
Sequential:
BPSK/(O)QPSK 1/2, 3/4,7/8
Outer Forward Error
Correction
Concatenated Intelsat Reed-Solomon outer codec to
IESS308/310 to 10 Mbps, available with Viterbi, TCM and
Sequential
For DVB-S, Reed-Solomon outer codec (204, 188, T=8)
with interleaver depth of 12
Scrambling (IBS)
Synchronised to framing per IESS-309 up to 10 Mbps
Scrambling (IDR,
Closed Network)
With RS coding: synchronised to RS overhead.
Without RS coding and non-TPC FEC: V.35 self-
synchronising
No RS coding with TPC FEC: 2
12
-1 up to 10 Mbps
Scrambling (Closed
Network Plus ESC)
32kbps or above: synchronised to ESC overhead.
Less than 32kbps: as per closed network.
V.35 scrambler up to 100Mbps
IF Connector Type
BNC female
L-band connector Type
N-type female
IF Impedance
50
Ω
& 75
Ω
L-band Impedance
50
Ω
IF Return Loss
>18dB
L-band Return Loss
>15dB
Internal Frequency
Reference - Ageing
<1ppm/yr
External Reference
Clocking only: 1 to 10MHz in 1kHz steps.
Clocking and RF frequency: 10MHz, 0dBm±1dB