Mocomtech CDM-QX operation manual Bist BERT-Config BERT-Mon BERT-Control ENT

CDM-Qx Satellite Modem	Revision 5
Front Panel Operation	MN/CDMQx.IOM

If BIST is selected, the display will show:

BIST: BERT-Config	BERT-Mon
BERT-Control	(◄ ►, ENT)

The Built-In System Test (BIST) specifically refers to the built-in BERT (BER Tester). If BERT-Configis selected:

BERT Config: Tx=ON Rx=ON

Tx-Pat=2047 Rx-Pat=2047

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-Monis selected:

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).

If BERT-Controlis selected:

BERT Control: 10E-3Err=OFF

Restart=NO SyncThres=>256

The 10E-3Errcontrol 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

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