CDM-Qx Satellite Modem Revision 5
Front Panel Operation MN/CDMQx.IOM
5–63
If BIST is selected, the display will show:
The Built-In System Test (BIST) specifically refers to the built-in BERT (BER Tester). If
BERT-Config is selected:
If the selected slot is Tx, the Rx parameters are not selectable, and vice-versa. Note the
BERT generator resides at the Tx side while the BERT monitor resides at the Rx side.
This menu allows to turn ON/OFF either the BERT generator or monitor and selects the
BERT pattern as the user may desire. The BERT pattern supported are Space, Mark, 1:1,
1:3, 63, 511, 2047, 2047R (or 2047 alternate), MIL-188, 2^15-1, 2^20-1, and 2^23-1.
If BERT-Mon is selected:
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).
If BERT-Control is selected:
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
BIST: BERT-Config BERT
Mon
BERT-Control (◄ ►, ENT)
BERT Config: Tx=ON Rx=ON
Tx-Pat=2047 Rx-Pat=2047
BERT Monitor: Errs=0000253
BER=8.5E-07
BERT Control: 10E
Err=OFF
Restart=NO SyncThres=>256
