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Remote Control
5.8 Bit Error Rate Status
5.8.1 Raw BER
Command:
Response:
Example: Request Raw BER from modem 123.
Command:
Response:
*Note: "No Data" is returned if no carrier is detected (decoder not locked).
5.8.2 Corrected BER
Command:
Response:
Example: Request Corrected BER from modem 19.
Command:
Response:
*Note: Corrected BER limits are; lower <1E-8, upper >1E-3. "No Data" is returned if no
carrier is detected (decoder not locked).
5.8.3 Corrected BER Log
Error data (samples) are compiled at the nominal system rate indicated by the time
parameter (t.t). The samples are stored in a thirty-two-element FIFO. When the "CBEL_"
command is received the samples in the FIFO are formatted and returned as indicated.
The FIFO is then flushed. If the FIFO becomes full the oldest sample will be lost as the
current sample is written.
Command:
Response:
Notes:
1. The most recent sample is represented by 'sn" while the least recent sample is
B-B–20
<add/RBER_"cr"
>add/RBER_nnnnE-4"cr""lf"]
<123/RBER_"cr"
>123/RBER_152E-4"cr""lf"]
<add/CBER_"cr"
>add/CBER_nE-m"cr""lf"]
<19/CBER_"cr"
>19/CBER_3E-5"cr""lf"]
<add/CBEL_"cr"
>add/CBEL_t.t;s1,s2,s3 ... sn"cr""lf"]
t.t = Time between corrected BER samples in seconds ("0.1" to "9.9").
; = At least one data point has been logged.
s1 to sn = Corrected BER samples in the format of (xmmee):
x - The optional data modifier "<" or ">" (less than or greater than).
mm - The corrected BER mantissa ("01" to "99").
ee - The corrected BER negative exponent ("00" to "99").
represented by 's1".
SDM-309B Satellite Modem
nnnn = RBER or nnnn = <1.0 (lower limit)
RBER = .0152 errors/bit
CBER = .00003 errors/bit
MN/U-SDM309B Rev. #
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