Comtech EF Data SDM-2020, Installation And Operation Manual

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Operation SDM-2020 Satellite Demodulator
3–20 Rev. 3
3.3.2 Monitor
Refer to Figure 3-8.
When the Monitor level is entered, press [
←
] or [
→
] to select the desired monitor
function. Each monitor function is displayed in real time as long as it is selected.
RAW_BER Displays the current BER or No Data (if carrier is not locked).
Range: <m.m E-e to >m.m E-e.
Note: Low limit based on performance. High limit based on data/code rate.
CORRECTED BER Displays the current corrected BER estimated or No Data (if carrier is not
locked).
Range: <m.m E-e to >m.m E-e.
Note:
Low limit based on performance. High limit is 1.0 E-12.
Eb/N0 Displays the current Eb/N0 estimated or No Data (if carrier is not locked).
Range: <mm.m to >mm.m.
Note:
Low limit based on data rate. High limit is 16.0 dB.
E
B
/N
0
MARGIN Displays the current E
b
/N
0
margin by calculating:
E
b
/N
0
Margin = [ E
b
/N
0
- E
b
/N
0
Threshold]
RECEIVE SIGNAL Displays the signal level (See Figure 1-3).
For 1-input connector: Current RX level: -35.0 to –70.0 dBm.
For 4-input connector: Current RX level: -9.26 to –63.2 dBm.
SWEEP FREQUENCY Displays the current sweep frequency.
Range: 0 to 1,000,000 Hz (-500,000 to +500,000 Hz).
DEMOD SPECTRUM Displays the current sense of the RX Demodulator Spectrum as NORMAL
or INVERT.
LNB CURRENT Displays the LNB current (in mA) as CURRENT or LNB POWER OFF.
2047 PATTERN Displays “LOCKED” upon detection of a valid 2047 pseudorandom data
pattern. Displays “NO DATA” when the demodulator cannot detect a valid
2047 pseudorandom data pattern. Displays:
“NOT ENABLED” if “RX 2047 PATTERN” is selected OFF in the
<CONFIGURATION><INTERFACE> menu.
BUFFER FILL Displays the current plesiochronous buffer fill status percent.
Range: 1 to 99%
Note: Available only with G.703 Interface installed.
2047 ERRORS Receives 2047 BER. This is a monitor point that displays the current
RX2047 BER. If no data is available, “NO DATA” is displayed.
Notes:
1. SAMPLING is displayed when gathering data. This process can
take several minutes to calculate a BER based on a 2047 test
pattern.
2. Available only with G.703 interface installed.