Configure Versafec-2 Acm - Comtech EF Data CDM-425 Installation And Operation Manual

K.7.2

Configure VersaFEC-2 ACM

Chapter 6. FRONT PANEL OPERATION.
VersaFEC-2 ACM requires the plug-in Option Card, and the appropriate FAST
code for the maximum operating symbol rate.
Do these steps to configure the VersaFEC-2 ACM operation using the front panel:
Step Task
1 (SELECT) CONFIG: MODE
Set the Tx and Rx modes as V2-ACM.
2 (SELECT) CONFIG: TX  FEC
Set the Tx FEC type as VersaFEC-2 Long, or
VersaFEC-2 Short Block
3 (SELECT) CONFIG: TX  SYMB
Enter the desired transmit symbol rate. Note that this
is a fundamental departure from the way in which the
modem is typically configured.
4 (SELECT) CONFIG: TX  POWER
If Manual mode is selected, enter the desired
transmit output level. This will also be the Nominal
Power value if AUPC is selected.
If AUPC mode is selected, two additional choices are
presented – Mode/Range and Alarm Action, as
shown here:
In all case except MEO (which is a very unusual
mode) the mode is fixed at Normal. Enter the
maximum permitted power increase, between 0.0 and
9.9 dB.
You can choose to generate an alarm when the max
power or min ModCod has been reached, or not at
all. You can also choose what happens to Tx Power
when the remote demod unlocks. The choices are
Nominal Power, Max Power, or Hold.
Appendix K
The Transmit symbol rate is limited by the FAST code installed. There are five options:
• 37 ksps to 1200 ksps
• 37 ksps to 8000 ksps
CDM-425 Advanced Satellite Modem
Front Panel VFD Mnemonic
Mode:Tx=V2-ACM:None Rx=V2-ACM:None
(422,V35,G703s,Audio,LVDS,HSSI,IP,ASI)
Tx-IF Freq Power FEC Mod Symb Scrambler
(Data 00192.000kbps, 00131.657ksps)()
Enc=VF2L(VF2L, VF2S)
Reed-Solomon=Off
Tx-IF Freq Power FEC Mod Symb Scrambler
(Data 00192.000kbps, 00131.657ksps)()
TxSymbolRate = 01000.000 ksps (ACM Mode)
Data Invert=Off Clock Invert=Off
• 37 ksps to 2000 ksps
• 37 ksps to 12500 ksps
Output Power: Mode= Manual (Manual,
AUPC)
Level= –20.0 dBm
Output Power: Mode= AUPC (Manual, AUPC)
Mode/range Alarm Action
AUPC-ACM Mode = Normal (Normal, +/-
Track)
Max Permitted Power Increase: 3.0 dB
()
Tx Alarm: None (MaxPwr, MinMCod, None)
Rem Dmod Unlock Act=Nom Pwr(Nom, Max,
Hold)
K–21
Revision 0
(Fixed in ACM) ()
()
• 37 ksps to 4100 ksps
()
()
MN-CDM-425