Comtech EF Data CDM-625 - Framing Summary

CDM-625 Advanced Satellite Modem Revision 13
Introduction MN-CDM625
1–23
1.4.6 Framing Summary
Framing Mode 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 Proprietary scrambler
EDMAC-2 1.6% All rates and formats
Remote control link
between modems’
processor plus AUPC
200/180 Proprietary scrambler
EDMAC-3
To 2 Mbps: 5%
Above 2 Mbps: 1.6%
All rates and formats
Remote control link
between modems’
processor plus AUPC
200/180 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 = 31
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
0.78% (129/128) 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)
Framed QDI
Concatenation of QDI
and EDMAC-2
n x 64 kbps, up to
n = 128 using a max of
4 balanced G.703 E1
D&I interfaces
None 200/180
Basic ITU V.35
(Intelsat)
Notes:
1. Reed-Solomon is Off.
2.
% for Rates 5/16 or 21/44 BPSK Turbo, Rate 1/2 QPSK/OQPSK Turbo, and all rates > 2 Mbps.