Quantum and Evolution Series Installation and Operating Handbook
13-2
Inner Forward Error
Correction
Viterbi BPSK/QPSK/OQPSK – Rates 1/2, 3/4, 7/8, k=7
to IESS-308/309
Option: TCM 8PSK – Rate 2/3 to IESS-310
Option: TPC BPSK/QPSK/OQPSK – Rates 5/16, 21/44,
0.493 (Paradise), 2/3, 3/4, 0.789 (Paradise), 7/8
(Paradise), Rate 7/8 de facto
Options: TPC 8PSK – Rates 3/4 de facto, 7/8 de facto,
0.93 (Paradise)
Options: TPC 16QAM – Rates 3/4 de facto, 7/8 de facto,
0.93 (Paradise)
Outer Forward Error
Correction
Concatenated Intelsat Reed-Solomon Outer Codec to
IESS308/310 with Custom Option offering variable code
rate up to 10 Mbps.
Scrambling – IBS/SMS
Option
Synchronised to framing per IESS-309 up to 10 Mbps
Scrambling – IDR
Option and 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 has CCITT, Intelsat, Fairchild and
Linkabit modes up to 55Mbps (with high Data Rate
options)
Scrambling
OM-73 Option
Up to 55Mbps (PD55 only)
IF Connector Type
BNC female
L-band connector Type
N Type female
IF Impedance
50
Ω
& 75
Ω
, electronically selectable
L-band Impedance
50
Ω
IF Return Loss
18dB typical
L-band Return Loss
14dB Minimum
Internal Frequency
Reference - Ageing
<1ppm/yr
External Reference
Clocking Only: 1-10MHz in 1kHz steps.
Clocking and RF Frequency: 10MHz, 0dBm±1dB