RFX144V24-S23 and RFX96V24-S23 Modem Designer’s Guide
1070
4-9
No. 15
Rotation Angle
Represents instantaneous correction for phase and frequency errors.
Format:
16-bits, twos complement
Equation:
Rotation Angle (degrees) = [(Rotation Angle Word)h/10000h] x 180
No. 16
Frequency Correction
Represents component of rotation angle caused by frequency error.
Format:
16 bits, twos complement
Equation:
Frequency Correction (Hz) = [(Freq. Correction Word)h/10000h] x Baud in Hz
Range:
FC00h to 0400h representing ±37.5 Hz
No. 17
Eye Quality Monitor (EQM) Hard Decision
Equals the filtered squared magnitude of the error vector. Proportionality to bit error rate is determined by particular
application. Stabilizes in approximately 700 baud times from ~RLSD going active.
Format:
16 bits, positive, twos complement
No. 18
Eye Quality Monitor (EQM) TCM Minimum Metric (RFX144 models)
Equals the filtered squared magnitude of the path length for TCM modes. Stabilizes in approximately 1200 baud times from
~RLSD going active.
Format:
16 bits, positive, twos complement
No. 19
RLSD Turn-On Threshold
No. 20
RLSD Turn-Off Threshold
No. 21
Receiver Sensitivity (MAXG)
Three parameters can be programmed by the host to control the RLSD turn-on and turn-off thresholds: (1) Post-AGC Turn-
on Threshold, (2) Post-AGC Turn-off Threshold, and (3) Receiver Sensitivity (MAXG) - AGC Gain Word Limit.
Format:
16 bits, positive, twos complement
Equation:
RLSD Turn-on Threshold = 2185 (10 (TON + 50 - [(MAXG/64)0.098])/10)
RLSD Turn-off Threshold = 2185 (10(TOFF +50 - [(MAXG/64)0.098])/10)
Receiver Sensitivity (MAXG) = 655.36 [50 - Gain Limit (dB)]
Where:
TON is the turn-on threshold in dBm.
TOFF is the turn-off threshold in dBm.
MAXG is programmable in RAM and defaults to 0FC0h (4032).
No. 29
Minimum On-Time (DTMF)
The on-time is defined as the minimum period of time of the DTMF signal beginning when the signal is detected and ending
when the energy is below the turn-off threshold. The on-time parameter cannot be set below 29.6 ms (0000h). The default
on-time parameter is set for 40.0 ±1 ms. The on-time will vary with signal level. To increase or decrease the on-time
parameter value, convert the increase/decrease into hex and add/subtract to/from the current value. (See Section 13.3.)
Format:
16-bits, positive, twos complement
Equation:
Minimum On-Time ± [(Increase/Decrease in ms)9.6]h
Range:
0 to 7FFFh
Default Value:
007Ah (CONF = 21h); 005Fh (CONF = 90h, 92h, 94h or 98h)
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