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P300H P300 Series Modem Installation and Operating Handbook Page 153
The following table defines what happens when differing scramblers are interworked
Scrambler CCITT INTELSAT FDC Linkabit
Descrambler
CCITT OK 1x10 error rate* Hopeless Data invert and
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1x10 error rate*
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INTELSAT 1x10 error rate* OK Hopeless Data invert
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FDC Hopeless Hopeless OK Hopeless
Linkabit Data invert and Data Invert Hopeless OK
1x10 error rate*
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* Pattern Dependent
8.10 INTERWORKING DIFFERENT MANUFACTURERS EQUIPMENT
Unfortunately not all manufacturers use the same terminology, and so this complicates circuit set up. To
the best of our ability the following table shows the equivalence between manufacturers. This table will be
extended as information on other products is forthcoming.
Equipment
Scramblers in the columns below are determined to be equivalent
Paradise P300 Series Modem CCITT INTELSAT FDC Linkabit
Paradise P200 series (closed net) "Scrambler on"
BPSK requires P300 Tx Spectrum invert
Paradise P230 IBS/SMS Uses synchronous IBS scrambling, so V.35 type not an issue
FDC SM290 / SM2900 (Viterbi) "V.35" "FDC" "Link"
FDC SM290 / SM2900 (Sequential) "Link" "FDC" "V.35"
SSE SM3000/4000 (Viterbi) "V.35" "FDC" "308"
SSE SM3000/4000 (Sequential) "308" "FDC" "V.35"
EF SDM 300 / 300A (Viterbi) "IESS
308(V.35)"
EF SDM 300 / 300A (Sequential) "IESS "IESS
(Requires Tx & Rx Spectrum invert on P300
Modem)
308(V.35)" 308(V.35)"
(300/A set for data (300/A set for true
invert) data)
EF SDM 650B "V.35" "V.35"
(Requires Tx & Rx Spectrum invert on P300 (650B set for data (650B set for true
Modem) invert) data)
Comstream CM701 "Comstream" "IDR MAN" "Comstream"
Viterbi: BPSK requires P300 Tx/Rx spectrum (701 set for data (true data but poss
invert, QPSK is OK
Sequential
requires P300 Rx spectrum invert
in BPSK and both Tx & Rx spectrum invert in
QPSK. See Appendix E: FaultMode=11
invert) 10 error rate)
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A `compatibility document` which describes interworking tests between the Paradise P300/P400 Modems
and other manufacturers modems is available on request.