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CDM-600L Satellite Modem
Front Panel Operation
When Drop Framing or the G.703 interface type is used the [↑] [↓] arrow keys will scroll
through the available data rates. If in Drop Mode and the data rate is edited to 1920 kbps, a
comment is shown to indicate that E1 fixed channel mode will be implemented.
When G.703 is used and the Modem is Hardware Revision 2.0 or higher, three auxiliary
rates will also be available (512, 1024 and 2048 kbps) indicated by the word AUX
appearing to the right of the decimal place. (For example, 00512.AUX kbps).
Refer to Section 4.3 IDI/DDO connectors for additional information about how to connect
the cables for the AUX data rates.
The bottom line permits the user to select the data inversion feature (added for
compatibility with certain older equipment). Select either ON or OFF, using the [↑] [↓]
arrow keys, then press ENTER.
CONFIG: TX: SCRAMBLER
TX SCRAMBLER = NORMAL (NORMAL,OFF)
Select either ON or OFF, using the [↑] [↓] arrow keys, then press ENTER.
The choice of scrambler is selected automatically, and will be depend on the exact
operating mode. For example, if no framing is being used, the ITU V.35 scrambler
(Intelsat variant) will be used. If IBS framing is selected, the IESS-309 scrambler will be
used, etc. If Turbo encoding is used, a second scrambler is available: IESS-315 V.35
instead of the TPC scrambler:
TX SCRAMBLER = IESS (NORMAL, IESS, OFF)
If LDPC encoding is selected the standard ITU V.35 scrambler will be used.
6.3.1.4
CONFIG: RX
RX-IF DECODER
DATA=00064.000kbps
The sub-branches available are:
ENCODER SCRAMBLER
IESS-315 V.35 SCRAMBLER
DEMOD
DATA DESCRAM
SYMBOL=00064.000ksym
6–13
Revision 2
MN/CDM600L.IOM
EbNo
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