Radyne OM20 User Manual download pdf (Page 32)

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3.3.2. READable Values

The modem displays different state as well as performance parameters. These values can be

seen interactively on the front panel (except “E

Status”) and can also be retrieved by

SNMP.

These accessible values are described below (in parenthesis the related OID), whereas the

hints on the data representation refer to [RAD-a]:

• E

(radDmd20RxEbno)

Displays the estimated E

value as seen by the demodulator (in dBm)

• E

Status (radDmd20RxBerEbnoStatus)

Displays the status of the modem estimator, the value is stored as a bit field. On

startup, the agent initializes this to the value bx00000000. If the status is not equal to

digit “7”

then the estimated respectively displayed E

value is not valid.

Internal binary data representation:

Bit 0 = Raw BER and corrected BER status. 1 = Valid

Bit 1 = Test BER status. 1 = Valid

Bit 2, 3 = Eb/No status

0 = Eb/No invalid

1 = Eb/No valid

2 = Eb/No is smaller than indicated value

3 = Eb/No is greater than indicated value

Bit 4…7 = Reserved

• Input Level (radDmd20RxCarrierLeveldBmX100)

Displays the estimated receive signal level as seen by the demodulator (in dBm)

• Symbol Rate (radDmd20RxSymbolRateHz)

Displays the effective symbol rate (in sps)

• Bit Errors (radDmd20RxBitErrorCount)

Displays the current error count from the Viterbi decoder (in counts)

• Raw BER (radDmd20RxRawBerStatus)

Displays the estimated channel error rate (before decoding) measured by the modem

• Corrected BER (radDmd20RxCorrectedBerStatus)

The Corrected BER display shows an estimated corrected bit error rate of the modem.

Depending on the symbol rate the modem is running, the high-end performance scale

of this display will vary (E-09, E-10 or E-11). At some symbol rates, a better than

scale reading will appear as 0.00E-00. At other symbol rates, it will appear as E**. In

either case, they both mean performance is better than the scale upper limit.

See Table 3.3

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