Comtech EF Data CDM-710G - Manual (Page 45)

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.