CDM-625 Advanced Satellite Modem
Revision 1
Introduction
MN-0000036 (Ref MN/CDM625.IOM)
1.7.6
Framing Summary
Overhead added
Available data
rates and format
Overhead
components
Additional Reed-
Solomon Overhead
Scrambling
(see Note 1)
Transparent
None
All rates and
formats
None 200/220
225/205
219/201
126/112
Basic ITU
V.35 (Intelsat)
EDMAC
To 2 Mbps: 5%
Above 2 Mbps: 1.6%
(see Note 2)
All rates and
formats
Remote control
link between
modems’
processor plus
AUPC
200/180
or 220/200
Proprietary
scrambler
EDMAC-2
1.6%
All rates and
formats
Remote control
link between
modems’
processor plus
AUPC
200/180
or 220/200
Proprietary
scrambler
IDR
Fixed 96 kHz
T1, E1, T2 and E2;
all formats
EIA-422 ESC
(8 kbps)
EIA-422 ESC
(64 kbps or
2 audio links)
4 BW alarms
T1 = 225/205
E1 = 219/201 and
IESS-310 mode
T2/E2 = 194/178
Basic ITU V.35
(Intelsat)
IBS
1/15 of front panel
data rate
64 to 2048 kbps
only; all formats
EIA-232 Earth
station
link at 1/480
th
of
primary data rate.
One BW alarm
126/112
219/201 for IESS-310
mode
IESS-309
scrambler
D&I
1/15 of front panel
data rate
Terrestrial is T1 or E1
Specific multiples of
64 kbps only
EIA-232 Earth
station
link at 1/480
th
of
primary data rate
One BW alarm
126/112
219/201 for IESS-310
mode
IESS-309
scrambler
D&I++
1/45 of front panel
data rate
Terrestrial is
T1 or E1
Any multiple of 64
kbps, up to n = 24
Same as EDMAC,
plus EIA-232 Earth
station link at
1/576
th
of primary
data rate
126/112
Basic ITU V.35
(Intelsat)
ESC++
Variable: between
11.76% at 64 kbps to
1.58% above 7 Mbps
All rates and
formats
EIA-232 Earth
station
link at variable
rate, plus AUPC
126/112
Basic ITU V.35
(Intelsat)
QDI
0.4% of
front panel data rate
n x 64 kbps,
up to n = 128
using a max of 4
balanced G.703 E1
D&I interfaces
None 220/200
225/205
219/201
Basic ITU V.35
(Intelsat)
Notes:
1) Reed-Solomon is Off.
2) 1.5 % for Rates 5/16 or 21/44 BPSK Turbo, Rate 1/2 QPSK/OQPSK Turbo, and all rates > 2 Mbps
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