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Introduction
The CONEXANT™ RP56LD, RP336LD, and RP144LD
Modem Data Pump (MDP) families support data/fax
modem, voice coding/decoding, optional full-duplex
speakerphone, and optional AudioSpan (Table 1). Low
voltage and low power consumption support portable
applications. Downloadable architecture allows upgrading
of MDP code from the host/DTE.
In V.90/K56flex mode (RP56), the MDP can receive data
at speeds up to 56 kbps from a digitally connected V.90-
or K56flex-compatible central site modem. These MDPs
take advantage of the PSTN which is primarily digital
except for the client modem to central office local loop and
are ideal for applications such as remote access to an
Internet service provider (ISP), on-line service, or
corporate site. The MDP can send upstream data at
speeds up to V.34 rates.
In V.34 data mode (RP56 and RP336), the MDP can
connect at the highest data rate the channel can support
from 33.6 kbps to 2400 bps with auto-fallback to V.32bis.
In V.32 bis mode, the MDP can connect at the highest
data rate the channel can support from 14.4 kbps to 4800
bps with optional auto-fallback to lower rate modulations.
Internal HDLC support eliminates the need for an external
serial input/output (SIO) device in the DTE for products
incorporating error correction and T.30 protocols.
Voice mode includes an Adaptive Differential Pulse Code
Modulation (ADPCM) voice coder and decoder (codec).
The codec compresses and decompresses voice signals
for efficient digital storage of voice messages. The codec
operates at 28.8k, 21.6k, or 14.4k bps (4-bit, 3-bit, or 2-bit
quantization, respectively) with a 7.2 kHz or 8.0 kHz
sample rate.
A voice pass-through mode allows the host to transmit
and receive uncompressed voice samples in 16-bit linear
form at 7.2 kHz, 8.0 kHz, or 11.025 kHz sample rate, or in
8-bit A-Law/µ-Law PCM form at 8.0 kHz sample rate.
SP models support position-independent full-duplex
speakerphone (FDSP) operation using a dual internal
integrated analog circuit to interface with the telephone
line and the audio input/out (i.e., a headset, handset, or a
microphone with external speaker).
SP models in 144-pin TQFP also support a 4-line voice
serial interface used to transfer 16-bit linear or 8-bit A-
Law/µ-Law PCM FDSP voice samples with acoustic echo
cancellation to and from the host.
SP models also support AudioSpan (analog simultaneous
audio/voice and data) operation at a data rate of 4.8 kbps.
The MDP operates over the public switched telephone
network (PSTN) through the appropriate line termination.
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Features
•
Downloadable MDP code from the host/DTE
•
2-wire full-duplex
−
V.90 and K56flex (RP56 models)
−
V.34 (33.6 kbps) (RP56 and RP336 models)
−
V.32 bis, V.32, V.22 bis, V.22, V.23, and V.21
−
Bell 212 and 103
•
2-wire half-duplex
−
V.34 fax, V.17, V.33, V.29, V.27 ter, and V.21 ch 2
−
Bell 208
−
Short train option in V.17 and V.27 ter
•
Serial synchronous and asynchronous data
•
Parallel synchronous and asynchronous data
•
Parallel synchronous SDLC/HDLC support
•
In-band secondary channel (V.34 and V.32 bis)
•
Automatic mode selection (AMS)
•
Automatic rate adaption (ARA)
•
Digital near-end and far-end echo cancellation
•
Bulk delay for satellite transmission
•
ADPCM voice mode (7.2 kHz or 8.0 kHz)
•
Voice pass-through mode (7.2 kHz, 8.0 kHz, or 11.025 kHz)
•
Full-duplex speakerphone (SP models)
−
Acoustic and line echo cancellation
−
Programmable microphone AGC
−
Microphone volume selection and muting
−
Speaker volume control and muting; room monitor
•
Voice serial data interface (144-pin TQFP, SP models)
−
16-bit linear or 8-bit A-Law/µ-Law PCM voice
samples
−
FDSP support with acoustic echo cancellation
•
AudioSpan (SP models)
−
ITU-T V.61 modulation (4.8 kbps data plus audio)
−
Handset, headset, or half-duplex speakerphone
•
TTL and CMOS compatible DTE interface
−
ITU-T V.24 (EIA/TIA-232-E) (data/control)
−
Microprocessor bus (data/configuration/control)
•
Dynamic range: -9 dBm to -43 dBm
•
Adjustable speaker output to monitor received signal
•
DMA support interrupt lines
•
Transmit and receive (16+128)-byte FIFO data buffers
•
NRZI encoding/decoding
•
511 pattern generation/detection
•
V.8 and V.8 bis signaling
•
V.13 signaling
•
Diagnostic capability
−
V.54 inter-DCE signaling
−
V.54 local analog and remote digital loopback
•
+3.3V operation with +5V tolerant inputs
−
+5V or +3.3V analog signal interface
•
Low power consumption:
−
Normal Mode = 260 mW; Sleep Mode = 40 mW
•
Low profile, small footprint package
−
100-pin PQFP or 144-pin TQFP
−
Meets PC Card Type II envelope requirements
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CONEXANT [ CONEXANT SYSTEMS, INC ]
