RFX144V24-S23 and RFX96V24-S23 Modem Designer’s Guide
4-12
1070
No. 40
Transmitter Rate Sequence Pattern (RFX144 models only)
No. 41
Receiver Rate Sequence Pattern (RFX144 models only)
The following rate sequence patterns can be sent and detected by the modem as enabled by the ASPEED bit (see ASPEED
description in Table 3-1):
Encoding:
ASPEED
Data Rate
Rate Sequence Pattern
0
V.17, all rates
0111h*
1
14400 bps
0171h*
1
12000 bps
01B1h*
1
9600 bps
01F1h*
1
7200 bps
0331h*
1. * The most significant bit of the rate sequence pattern
corresponds to bit 0 in the V.17 rate sequence pattern.
Format:
16-bits, unsigned
No. 42
FR1 Tone Detector Coefficients
See Section 6 for scaling information.
No. 43
FR2 Tone Detector Coefficients
See Section 6 for scaling information.
No. 44
FR3 Tone Detector Coefficients
See Section 6 for scaling information.
No. 47
Tone Detector Threshold
This parameter represents the threshold value (1/8 by default) to compare with the output of the energy averager in the tone
detector. This parameter is used for all 3 filters .
Format:
16 bits, twos complement, positive value
Equation:
215 (1 - Threshold desired) h
Default Value:
7000h
No. 48
Maximum Samples per Ring Frequency Period (RDMAXP)
This parameter determines the maximum period on RINGD (GPI7) that will be indicated on RI. The default value of 71.4 ms
corresponds to the minimum ring frequency of 14 Hz. This allows proper detection of frequencies as low as 15 Hz.
Format:
16 bits, twos complement, positive value
Equation:
Maximum period samples = Sampling frequency (samples/sec)/minimum ring frequency (Hz)
Convert to hex and store in RAM.
Default Value:
023Bh (71.4 ms) for 8000 Hz sample rate
No. 49
Minimum Samples per Ring Frequency Period (RDMINP)
This parameter determines the minimum period on RINGD (GPI7) that will be indicated on RI. The default value of 13.9 ms
corresponds to the maximum ring frequency of 72 Hz. This allows proper detection of frequencies as high as 68 Hz.
Format:
16 bits, twos complement, positive value
Equation:
Minimum period samples = Sampling frequency (samples/sec)/maximum ring frequency (Hz)
Convert to hex and store in RAM.
Default Value:
006Fh (13.9 ms) for 8000 Hz sample rate
Summary of Contents for RFX144V24-S23
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