Comtech EF Data CDD-880 - Manual (Page 81)

CDD-880 Multi Receiver Router Revision 1
Ethernet-based Remote Product Management MN-CDD880
5–21
Individual Demodulator Settings
The acceptable/valid operating ranges for items in this section are provided in parentheses.
The upper range of Data and Symbol Rate selection requires activation of the
‘RECEIVE DATA RATE’ FAST option.
The Web Server Interface polls current operations and populates this section with the
configured demodulators (i.e., Demod #1 through Demod #12). If a slot is polled as empty or
otherwise unrecognizable, a message is displayed – e.g., Demod #X is not installed – in place of
a configurable row of parameters.
During operation, some parameters are automatically controlled – either by the ACM algorithm
or by the VMS – when executing dSCPC switches. During these times, some page functionality
becomes disabled and affected features display information on a read‐only basis.
For each operating demodulator, note the following selections on a per‐column basis from left
to right:
• Demod # – This is the available "FILLED" demodulator slot (automatically assigned in pairs
per each installed dual demodulator card).
• Demod Enable – Click this option button to enable the slot. Click [Submit] to execute this
operational change.
• Rx Symbol Rate (16 ksps‐4.5 Mbps) – Enter the symbol rate, and then click [Submit] to save.
• Rx Data Rate (16 kbps‐15.350 Mbps) – Enter the data rate, and then click [Submit] to save.
When Adaptive Coding and Modulation (ACM) is set to Enable, the Data Rate
is set automatically (manual configuration of Data Rate is disabled), and the
appearances of the Rx Data Rate and Rx MODCOD columns change as follows:
• Frequency (950‐2150) – Enter the Rx frequency, in MHz.
• Rx MODCOD – Use the drop‐down menu to select the demodulation type and FEC rate
(MODCOD). Selections are as follows:
o
VersaFEC – QPSK 0.488
o
VersaFEC – 8-QAM 0.642
o
VersaFEC – 16-QAM 0.829
o
VersaFEC – QPSK 0.533
o
VersaFEC – 8-QAM 0.711
o
VersaFEC – 16-QAM 0.853
o
VersaFEC – QPSK 0.631
o
VersaFEC – 8-QAM 0.780
o
VersaFEC – QPSK 0.706
o
VersaFEC – 16-QAM 0.731
o
VersaFEC – QPSK 0.803
o
VersaFEC – 16-QAM 0.780