RFX144V24-S23 and RFX96V24-S23 Modem Designer’s Guide
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Table 3-1. Interface Memory Bit Definitions (Cont’d)
Mnemonic
Location
Default
Name/Description
Configuration Definitions: (Cont'd)
V.17. The modem operates as specified in ITU-T Recommendation V.17.
V.33. The modem operates as specified in ITU-T Recommendation V.33.
V.29. The modem operates as specified in ITU-T Recommendation V.29.
V.27 ter. The modem operates as specified in ITU-T Recommendation V.27 ter.
V.23. The modem operates as specified in ITU-T Recommendation V.23. Sample rate is 9600.
V.23 Receive. The modem operates as specified in ITU-T Recommendation V.23.
V.21 Channel 2. The modem operates as specified in ITU-T Recommendation V.21 Channel 2.
V.21 Channel 2 and DTMF Receiver. The modem operates as specified in ITU-T Recommendation
V.21 Channel 2 and detects DTMF transmissions.
Tone Transmit. The modem transmits single or dual frequency tones in response to the RTS input pin
or RTSP bit. Tone frequencies and amplitudes are programmable in the DSP RAM.
Tone Detect. When the Tone Detect configuration is selected and 12TH is a 1, the three 4th order tone
detect filters are combined into a single 12th order tone detect filter (FR3). If 12TH is not set to a 1, the
three tone detect filters are placed in parallel and are independent (FR1, FR2, and FR3). All tone detect
filters are programmable.
High Speed Modes. The 2400 bps through 14400 bps modes.
Voice Codec Mode with Room Monitor. Voice coder and decoder with optional error correction coding
(CDEN, DCDEN, HDLC). DTMF detect and three tone detectors with a local echo canceller during
decoder operation. Dual/single tone transmission when decoder disabled (RTSP). Continuously
selectable pitch synchronized decoder playback speeds of 50% faster, 33% faster, or 50% slower than
normal speed (FAST50, FAST33, SLOW, NORM). Selectable XIA and IIA recording source and
playback destination (CODECS). Room monitor routes the IIA Mic input signal to the IIA Line output, or
routes the XIA Mic input signal to the IIA Line output (RMM).
Audio Codec Mode with Room Monitor. 24 kbps or 32 kbps audio coder and decoder (CDEN,
DCDEN). DTMF detect and three tone detectors are available. Dual/single tone transmission is
available when the decoder is disabled. During the decoder operation, a local echo canceller is used to
improve DTMF and tone detector operation. Selectable XIA and IIA recording source and playback
destination (CODECS). Room Monitor routes the IIA ADC input signal to the IIA DAC output, or routes
the XIA ADC input signal to the IIA DAC output (RMM).
Audio Mode. Three tone detectors are available. During audio playback, DTMF detection is available. A
local echo canceller is used to improve DTMF and tone detector operation. Selectable XIA and IIA
recording source and playback destination (CODECS).
Full-duplex Speakerphone Mode. Two DTMF generators and one tone detector are available. Control
bits at register locations 0E and 0F can be configured at anytime to select speakerphone functions such
as AGC enable/disable, muting, tone transmit, volume control, and speakerphone/handset switch.
Summary of Contents for RFX144V24-S23
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