Comtech EF Data CDM-625 Installation And Operation Manual page 86

CDM-625 Advanced Satellite Modem
Front Panel Operation
TPC (with TPC/LDPC
Codec installed)
LDPC (with TPC/LDPC
Codec installed)
If the TPC/LDPC Codec is installed and TPC is selected from the FEC menu, the options appear
as shown:
Modulation=QPSK
FEC Rate=1/2
5.4.3.6 CONFIG: Tx
Tx Data Rate = 01544.000 kbps
Data Invert = Off (Off,On)
The top line permits the Data Rate to be edited. Select the digit of Data Rate to be edited using the
► arrow keys. Change the value of the digit using the
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, Modulation type and FEC Code 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
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 (512, 1024 and 2048 kbps) will also be available and are
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).
In QDI (Quad D&I) mode, these data rates are read-only! The data rate will be the sum of the
tributary rates for all ports, and must be edited via the QDI menu.
The bottom line permits the user to select the Data Inversion feature (added for compatibility with
certain older equipment). Select either On or Off using the
BPSK
QPSK, OQPSK
8-PSK (FAST option)
16-QAM (FAST option)
BPSK
QPSK, OQPSK
8-PSK, 8-QAM (FAST)
16-QAM (FAST option)
(B,Q OQ,8PSK,16Q,8QAM)
(1/2,3/4,7/8,0.95)
Data
5–14
MN-0000036 (Ref MN/CDM625.IOM)
5/16, 21/44
1/2 (aka 21/44), 3/4, 7/8, 0.95
3/4, 7/8, 0.95
3/4, 7/8
1/2
1/2, 2/3, 3/4
2/3, 3/4
3/4
( 34v )
(34v)
arrow keys, then press ENTER.
▲ ▼
▲ ▼
arrow keys, then press ENTER.
▲ ▼
Revision 1
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