RFX144V24-S23 and RFX96V24-S23 Modem Designer’s Guide
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Voice Codec Mode (V24 Option)
In this mode, the modem can compress a voice message at an average rate of 2.9 kbps or at a fixed rate of 4.7 kbps and
decompress a voice message at various pitch synchronized playback speeds. Optional error correction coding is available
for use with ARAMs.
DTMF detect, tone detect, tone transmit and room monitor functions are also supported.
Audio Codec Mode (V24 Option)
This mode enables the host to record and playback audio (e.g., music/voice) with highest fidelity. The modem can compress
an audio signal to 32 kbps or 24 kbps.
DTMF detect, tone detect, tone transmit and room monitor functions are also supported.
Audio Mode
The Audio Mode enables the host to transmit and receive 8-bit or 16-bit audio signals. In this mode, the host can access the
analog-to-digital (A/D) converter (ADC) and the digital-to-analog (D/A) converter (DAC). Incoming analog audio signals can
then be converted to digital format and digital signals can be converted to analog audio output.
DTMF detect during transmit, and tone detect during transmit and receive, are supported.
Room Monitor Mode
Room Monitor Mode allows the remote-end user to monitor the local room activity by listening to audio captured by the
microphone connected to the XIA input or, in the absence of the XIA, to the IIA input. Room monitor operation is also
available in Voice Codec Mode and Audio Codec Mode.
Speakerphone Mode (-S Option)
The speakerphone Mode provides hands-free full-duplex telephone operation under host control. The host can separately
control volume, muting, AGC, and tone generation in microphone and speaker channels. The speakerphone automatically
recalculates loop control parameters to maintain duplexity and stability.
V.23 Full-Duplex Features (-23 Option)
The modem can transmit and detect Break signals (continuous Space).
The Mark and Space frequencies are 1300 and 2100 Hz, respectively, for 1200 bps, and 390 and 450 Hz, respectively, for
75 bps.
The modem transmitter output can be forced to zero.
The modem includes an optional host programmable Receive Compromise Equalizer for V.23 1200 bps reception and Caller
ID Mode.
Default transmitter turn-on sequence time is shown in Table 1-5. See Section 4 for programming information.
Table 1-5. V.23 Default Turn-On and Turn-Off Sequences
Configuration
RTS On to CTS On
RTS Off to CTS Off
V.23 FDX
10.5 ms
2.2 ms
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