Comtech EF Data CDM-800 Dokumentacja Pobierz pdf (Strona 81)

CDM-800 Gateway Router Revision 1

Ethernet-based Remote Product Management MN-CDM800

5–21

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• FECType–Atpresent,DVB‐S2isthesoleavailableFECtype.

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• TxFrequency(950to2150MHzforL‐Band,50to180MHzforIF)–EntertheTxfrequency

inMHz.

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• Frame – Use the drop‐down menu to select the Frame type as Normal or Sh

rt.This field

willbeforcedtoNormalifanyMODCODenabledinGroupQoS(seeSect.5.4.4.3.5.1)hasa

coderateof9/10.

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• Pilots(read‐on

y)–ThisfeatureisalwaysON.

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• Gold Code (000000 to 262141) – The Gold‐n Index indicates the Physical Layer spreading

sequencenumber.Thedefaultsettingisall0s.

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• Roll Off – The Tx Alpha Rolloff  (α) dictates how fast the spectral edges of th

e carrier

 are

attenuated beyond the 3 dB bandwidth. With 20% rolloff  the edge falls  off more quickly

thanwith25%and35%.

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Usethedrop‐downmenutosettheexpectedfilterTxAlphaRolloff(α)ofthecarrieras20%,

25%,or35%.Thedefaults

lectionis20%.

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• SpectrumInvert–Usethedrop‐downmenutoselecttheTxSpectrumInvertasNormalor

TxSpectrumInverted.

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• Power Level (‐40 to‐5 dBm for L‐Band,‐25 to‐5.0 for 70/140 MHz

) – En

ter the Tx power

level,indBm.

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• CarrierState–Usethedrop‐downmenutoselecttheTxCarrierStateaseitherOfforOn.

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SelectorenterthedesiredTxFrequen cy,TxSymbolRate,Frame,GoldCode,RollOff,Spectrum

Invert,andCarrierStates

ttings.Click[Submit]tosave.

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