CDM-625 Advanced Satellite Modem
Revision 1
Front Panel Operation
MN-0000036 (Ref MN/CDM625.IOM)
The Decoder type dictates the FEC Rate choices:
Decoder Type
Modulation Type
FEC Rate Choice
No Encoder
BPSK
QPSK, OQPSK
Fixed at 1/1
Fixed at 1/1
Non-Turbo Encoder
BPSK
TCM 8-PSK (FAST option)
QPSK, OQPSK
16-QAM (Vit+RS only)
Fixed at Rate 1/2
Fixed at Rate 2/3
1/2, 3/4, 7/8
3/4, 7/8
TPC (with TPC/LDPC
Codec installed)
BPSK
QPSK, OQPSK
8-PSK (FAST option)
16-QAM (FAST option)
5/16, 21/44
1/2, 3/4, 7/8, 0.95
3/4, 7/8, 0.95
3/4, 7/8
LDPC (with TPC/LDPC
Codec installed)
BPSK
QPSK, OQPSK
8-PSK, 8-QAM (FAST)
16-QAM (FAST option)
1/2
1/2, 2/3, 3/4
2/3, 3/4
3/4
If the TPC/LDPC Codec is installed, the options appear as shown:
Demodulation=QPSK (B,Q OQ,8PSK,16Q,8QAM)
FEC Rate=1/2 (1/2,3/4,7/8)
(
34v
)
5.4.4.5
CONFIG: Rx
Æ
Data Rate
Rx Data Rate = 00064.000 kbps
Data Invert = Off (Off,On)
(
34v
)
The top line permits the Data Rate to be edited. Select the digit of the Data Rate using the
◄
►
arrow keys. Edit the value of the digit using the
▲
▼
arrow keys, then press
ENTER.
The maximum limits for the data-rate are 18kbps to 25Mbps. The actual minimum and maximum
data rates are dependent on Framing mode, Interface type, Demodulation type and FEC Decoder
Rate. If the user changes any of the higher-priority parameters causing the data rate to become
invalid, the
Data Rate
is adjusted automatically. The upper range of data rate will also be
dictated by the
FAST option(s)
installed.
When configured for D&I or IDR framing or for G.703 interface type, the
▲
▼
arrow keys will
scroll through only the available data rates. If in D&I framing and the data rate is edited to 1920
kbps, a comment is shown to indicate that E1 Fixed Channel Mode will be implemented.
When G.703 is used, three auxiliary rates will also be available (512, 1024 and 2048 kbps)
indicated by the word AUX appearing to the right of the decimal place (
For example
:
00512.AUX kbps
). For information on how to connect the cables for the AUX G.703 data rates,
refer to the IDI/DDO connectors section of the table in
Section 1.3.1.2 Rear Panel
(
Chapter 1.
INTRODUCTION)
.
5–19
