Comtech EF Data SDM-309B - Manual (Page 197)

Remote Control SDM-309B Satellite Modem
B-B–20 MN/U-SDM309B Rev. #
5.8 Bit Error Rate Status
5.8.1 Raw BER
Command:
Response: >add/RBER_nnnnE-4”cr””lf”] nnnn = RBER or nnnn = <1.0 (lower limit)
Example: Request Raw BER from modem 123.
Command: <123/RBER_”cr”
Response: >123/RBER_152E-4”cr””lf”] RBER = .0152 errors/bit
*Note: "No Data" is returned if no carrier is detected (decoder not locked).
5.8.2 Corrected BER
Command:
Response: >add/CBER_nE-m”cr””lf”]
Example: Request Corrected BER from modem 19.
Command: <19/CBER_”cr”
Response: >19/CBER_3E-5”cr””lf”] CBER = .00003 errors/bit
*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: >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”).
Notes:
1. The most recent sample is represented by ‘sn” while the least recent sample is
represented by ‘s1”.