Comtech EF Data CDM-625A - Manual (Page 143)

CDM-625A Advanced Satellite Modem MN-CDM625A
Front Panel Operation Revision 3
6–17
6.2.1.3.4 CONFIG: Tx  FEC
Enc=Vit (Vit,Seq,TCM,TPC,LDPC,VFEC,ULL)
Reed-Solomon=On (Off, On) ()
Use the ◄ ► arrow keys to select Encoder or Reed-Solomon (or Diff Encoder – see Note 1
below). Press ENTER.
On the top line – Use the ▲▼ arrow keys to select an available Encoder option (shown in
parentheses). Press ENTER. Valid selections are:
► None (i.e., uncoded) ► Vit (Viterbi) ► Seq (Sequential)
► TCM (Trellis Coded Modulation)
8-PSK Rate 2/3 only (FAST option)
► TPC (Turbo Product Codec)
(Hardware option)
► LDPC (Low Density Parity
Check) (Hardware option)
► VFEC (VersaFEC) ► VF2L (VersaFEC-2 Long Block) ► VF2S (VersaFEC-2 Short Block)
► ULL (VersaFEC Ultra-Low Latency)
1) When you select None as the Encoder setting, the bottom line of the display changes
from Reed-Solomon to Diff Encoder (Differential Encoding).
2) The TPC (Turbo) and LDPC encoding selections display only when the TPC/LDPC
hardware option is installed.
On the bottom line – When Reed-Solomon is selectable, use the ▲▼ arrow keys to select On or
Off. Press ENTER.
CONFIG: Tx  FEC  Reed-Solomon On
Reed-Solomon Encoding =Standard(126/112)
(Standard(126/110),IESS-310(219/201)) ()
Use the ▲▼ arrow keys to select one of the listed parameters. Press ENTER.
With this display active, depending on the Framing mode, valid selections are:
► IESS-310, open or closed network 219/201
► IBS or D&I 126/112
► EDMAC or EDMAC2, closed network 200/180
► IDR, open network
225/205, 219/201 or 194/178
► ESC++ or D&I++, closed network 126/112
► Unframed closed network:
○ Comtech standard 220/200
○ Legacy EF Data 225/205, with V.35 scrambling