Comtech EF Data CDM-625A Installation And Operation Manual page 133

CDM-625A Advanced Satellite Modem
Front Panel Operation
On the bottom line – When Reed-Solomon is selectable, use the
Off, and then press ENTER.
CONFIG: Rx  FEC  Reed-Solomon On
Reed-Solomon Decoding =IESS-310(219/201)
(Standard(126/110),IESS-310(219/201)) ()
arrow keys to select an available parameter, and then press ENTER. Depending on
Use the
▲▼
the Framing mode, possible selections are as follows:
► IESS-310, open or closed network
► IBS or D&I
► EDMAC or EDMAC2, closed network 200/180
► IDR, open network
► ESC++ or D&I++, closed network
► Unframed closed network:
Otherwise, when Diff Encoder is selectable, use the
then press ENTER.
CONFIG: Rx  FEC  Diff Encoder On
When selecting Differential Decoding as OFF, there is no way for the modem to
resolve the phase ambiguities associated with PSK modulations. For BPSK there is a 1
in 2 chance that the polarity of the data will be correct. In QPSK there is a 1 in 4
chance that the data will be correct.
Enc=None (None,Vit,Seq,TCM,TPC,LDPC,VFEC)
Diff Encoder=On (Off,On)
219/201
126/112
225/205, 219/201 or 194/178
126/112
○ Comtech standard 220/200
○ Legacy EF Data
225/205, with V.35 scrambling
arrow keys to select On or Off, and
▲▼
6–25
Revision 0
MN-CDM625A
arrow keys to select On or
▲▼
()