Product specifications

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Front Panel Operation MN/CDMQX.IOM
5–52
5.6.2.2 TEST: BIST Æ BERT-Mon
BERT Monitor: Errs=0000253
BER=8.5E-07
If BERT monitor is turned ON, results are being displayed in bit errors and average BER. If it
displays BER=SyncLoss that means there was a loss of pattern synchronization. If it displays
BER=No Sync, that means pattern synchronization is not achieved. When the BERT monitor is
sync, the BER displays a value (e.g. BER=8.5E-07).
5.6.2.3 TEST: BIST Æ BERT-Control
BERT Control: 10E-3Err=OFF
Restart=NO SyncThres=>256
Note the following:
• The 10E-3Err control resides at the Tx. This generates an average BER=1.0E-03 once
monitored at the Rx side.
• The Restart control is to reset the BERT monitor (Rx side) for a fresh start of BER
measurement.
• The SyncThres control is the synchronization loss threshold as defined:
a. >256 = 256 bit errors counted in less than 1000 bits o data
b. low = 100 bit errors in less than 1000 bits of data
c. med = 250 bit errors in less than 1000 bits of data
d. high = 20,000 bit errors in less than 100,000 bits of data
5.6.3 TEST: Spec-Analyzer
Spectrum Analyzer:
Mode Config (◄ ►,ENT)
Select Mode or Config using the ◄ ► arrow keys, then press ENTER.
TEST: Spec-Analyzer Æ Mode
Spectrum Analyzer Mode:
Off On (◄ ►,ENT)
To control the engine of the spectrum analyzer, select Off or On using the ◄ ► arrow keys,
then press
ENTER. When the Spectrum Analyzer Mode is On, the user can view the spectrum
via Comtech EF Data’s Windows-based application software or the CDM-Qx/QxL embedded
Web browser.
TEST: Spec-Analyzer Æ Config
Config Spectrum Analyzer:
CenterFreq Span (◄ ►,ENT)
Select CenterFreq or Span using the ◄ ► arrow keys, then press ENTER.