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CDM-600L Satellite Modem
Front Panel Operation
with certain older equipment). Select either ON or OFF, using the [↑] [↓] arrow keys, then
press ENTER.
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 new 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: RX: DESCRAMBLER
RX DESCRAMBLER = NORMAL (NORMAL,OFF)
Select either ON or OFF, using the [↑] [↓] arrow keys, then press ENTER.
The choice of descrambler is selected automatically, and will be depend on the exact
operating mode. For example, if no framing is being used, the ITU V.35 descrambler
(Intelsat variant) will be used. If IBS framing is selected, the IESS-309 descrambler will be
used. If Turbo decoding is used, a second descrambler is also available: IESS-315 V.35
instead of the normal TPC descrambler:
RX DESCRAMBLER = IESS(NORMAL,IESS,OFF)
If LDPC encoding is selected the standard ITU V.35 scrambler will be used.
CONFIG: RX: EbNo
RECEIVE EbNo ALARM POINT = 00.1 dB
Select the digit of the Alarm point to be edited using the [←] [→] arrow keys. Edit the
value of the digit using the [↑] [↓] arrow keys. Press ENTER.
The range of values is from 00.1 to 16.0 dB. The user may select a value here, and if the
Eb/No falls below this value, a receive traffic fault will be generated.
DECODER DESCRAMBLER
IESS-315 V.35 DESCRAMBLER
6–17
Revision 2
MN/CDM600L.IOM
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