RP336LD, RP336LD (R6785-18), RP336LD R6764-28

The CONEXAN^TM 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/-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 ALaw/ -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.