CDM-625A Advanced Satellite Modem
MN-CDM625A
Front Panel Operation
Revision 4
6–22
The modem automatically selects the actual scrambler used for
Normal
, depending on the exact
operating mode:
•
If framing = IBS/D&I, the IESS-309 scrambler is used.
•
If Reed-Solomon is on but IBS/D&I is off, its frame synchronous scrambler is used per
IESS-310, App. H. An exception to this is legacy EF Data Reed-Solomon, which uses a
proprietary modified V.35 scrambler instead.
•
If framing = EDMAC/2/3 and Reed-Solomon is
OFF
, its frame synchronous scrambler is used.
•
If configured for TPC (Turbo) encoding and all of the above settings are off, the TPC frame
scrambler is used except for 8-QAM. For CDM-570 compatibility, TPC with 8-QAM uses the
V.35 scrambler.
•
ITU V.35 scrambler (Intelsat variant) is the default scrambler when all of the above settings
are
OFF
.
When you select
IESS
, the default ITU V.35 scrambler specified in IESS-315 takes priority over all
“normal” scramblers and is used instead. Therefore, for many operating modes, the two
scrambler selections are redundant.
When using TPC and Carrier-in-Carrier simultaneously, the IESS-315 (V.35) scrambler is the only
permitted choice.
Содержание CDM-625A
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Страница 42: ...CDM 625A Advanced Satellite Modem MN CDM625A Preface Revision 4 xxxvi Notes...
Страница 82: ...CDM 625A Advanced Satellite Modem MN CDM625A Installation Revision 4 2 6 Notes...
Страница 118: ...CDM 625A Advanced Satellite Modem MN CDM625A Updating Firmware Revision 4 4 14 Notes...
Страница 124: ...CDM 625A Advanced Satellite Modem MN CDM625A FAST Activation Procedure Revision 4 5 6 Notes...
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Страница 230: ...CDM 625A Advanced Satellite Modem MN CDM625A Front Panel Operation Revision 4 6 106 Notes...
Страница 314: ...CDM 625A Advanced Satellite Modem MN CDM625A Ethernet based Remote Product Management Revision 4 7 84 Notes...
Страница 579: ...CDM 625A Advanced Satellite Modem MN CDM625A Appendix B Revision 4 B 43 Figure B 25 VersaFEC 2 Short Block...
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Страница 756: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...