CDM-710G High-Speed Satellite Modem
Revision 1
Introduction
MN-CDM710G
1–19
1.5.4
Test Functions
Description
Requirements
CW
Generates a narrow carrier at the programmed frequency at the
programmed power level. Used in testing.
SSB Carrier
Provides desired sideband, suppressed carrier and suppressed
sideband.
Loopback Modes
•
Modulator
to Demodulator
•
I/O Loopback where applicable
•
Digital Loopback where applicable
1.5.5
Monitor Functions
Description
Requirements
Status Items – available via Front Panel
Fault Log with fault type and time stamp
Receive Signal Level
Report within
±
5 dB, typical
Es/No
Report within
±
0.5 dB, typical
Eb/No
Report within
±
0.5 dB, typical
1.5.6
Remote Port Operation
Description
Requirements
Comtech EF Data Remote Port
See Appendix A. REMOTE CONTROL
Ethernet Telnet
Ethernet transport of standard Remote Control commands.
Ethernet SNMP
See
Chapter 8. SNMP
.
Ethernet HTTP
Support all control and monitor parameters.
1.5.7
Data Rate Range
Symbol Rate and Data Rate Range for DVB-S2. There is some roundoff in the data rate ranges in
the last digit.
Table 1-5
is for the Standard FEC frame, and
Table 1-6
is for the Short Frame. The
tables are based on a 188-byte transport stream packet (only 188 is available).
DVB recommends turning the Pilot
ON
for 8PSK and higher modulation orders, particularly
when phase noise is present.
The following modes may need Pilot
ON
for low C/N operation: 8PSK 1/2, 16APSK 2/3 and 3/4,
and 32APSK 3/4 to assist carrier recovery.
QPSK 1/4, 1/3, and 2/5 data is for information only.
Содержание CDM-710G
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Страница 246: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...