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FO-1850TH
(4) Modem (R144V24) block
INTRODUCTION
The Rockwell RFX144V24-S23 and RFX96V24-S23 MONOFAX
facsimile modem family provides 14400 bps and 9600 bps half-du-
plex capability with options supporting DigiTalk™ voice and ADPCM
audio codecs, DigiTalk™ full-duplex speakerphone, and V.23 full-du-
plex. The modem models are identified in Table 1-1.
These functions are supplied in a single VLSI device or two-device
set (for speakerphone). The MDP (modem data pump) is packaged in
a 100-pin PQFP. The MDP contains an internal integrated analog
codec (IIA) and is pin-compatible with the RFX144V12/RFX96V12
and RFX144V12-S/RFX96V12-S MONOFAX modems. The XIA (ex-
ternal integrated analog codec), provided with speakerphone models,
is packaged in a 28-pin PLCC.
This device family enables cost-effective development of a common
facsimile machine design with digital answering machine and/or full-
duplex speakerphone.
The modem can operate at 14400 (RFX144 models), 12000 (RFX144
models), 9600, 7200, 4800, 2400, or 300 bps, and can perform HDLC
framing per T.30 at all rates. A programmable DTMF detector, three
programmable tone detectors, and Caller ID demodulator are pro-
vided.
The DigiTalk™ V24 voice coder/decoder (codec) compresses voice at
an average rate of 2.9 kbps or at a fixed rate of 4.7 kbps with near toll
quality playback. An average rate of 2.9 kbps provides 24 minutes of
stored voice messages in 4 Mbits of memory. This voice codec allows
the host controller to efficiently store and playback digital incoming
messages (ICMs) and outgoing messages (OGMs).
The ADPCM audio codec compresses audio signals (e.g.,
music/voice) at 32 kbps or 24 kbps for highest fidelity coding and
reproduction.
Selectable error correction coding allows storage in audio grade
RAMs (ARAMs). Echo cancellation techniques employed during play-
back allow DTMF and tone detection during voice/audio codec opera-
tion to support user selectable features. The coder can record mes-
sages from either the IIA or XIA. Dual/single tone transmission is
available when the decoder is disabled.
FEATURES
•
Group 3 facsimile transmission/reception
®
–
ITU-T V.17 and V.33 (RFX144 models)
–
ITU-T V.29, V.27 ter, T.30, V.21 Channel 2, T.4
–
HDLC framing at all speeds
–
Receive dynamic range: 0 dBm to –43 dBm
–
Automatic adaptive equalization
–
Fixed and programmable digital compromise equalization
•
V.27 ter short train
•
V.21 channel 2
–
DTMF detect and tone detect
•
Caller ID reception
–
Compromise equalizer
•
DigiTalk™ voice codec
–
24 minutes of voice storage per 4 Mbit memory
–
Near toll quality voice recording and playback
–
Programmable AGCs
–
Error correction coding allows ARAM usage
–
DTMF detect, tone detect, and tone transmit
–
Pitch synchronized fast and slow playback
–
Near-end echo cancellation
•
ADPCM audio codec
–
High fidelity recording and playback of audio signals
–
32 kbps and 24 kbps
–
Programmable AGC
–
DTMF detect, tone detect, and tone transmit
–
Near-end echo cancellation
•
8-bit or 16-bit high quality audio mode transmission/reception
MODEM DESIGNER'S GUIDE
•
Programmable transmit level
•
Programmable dual tone generation
•
Programmable tone detection
•
Programmable interface memory interrupt
•
Programmable ring detector
•
Eight general purpose input (GPI) and eight general purpose out-
put (GPO) pins for host assignment
•
DTE interface: two alternate ports
–
Selectable microprocessor bus (6500 or 8085)
–
ITU-T V.24 (EIA/TIA-232-E compatible) interface
•
TTL and CMOS compatible
•
+5V operation
•
Power consumption (see Table 2-7):
–
Normal: 620 mW (typical)
–
Sleep: 10.8 mW (typical)
•
Packaging
–
MDP: 100-pin PQFP (plastic quad flat pack)
–
XIA: 28-pin PLCC (plastic leaded chip carrier)
•
Software compatible with other MONOFAX modems
5 – 6
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