RS56-PCI

General

The RS56-PCI Device Sets provide the processing core for a complete system design featuring data/fax modem, voice/TAM, and speakerphone depending on specific model (Table 1).

Note: The term, "SoftK56", refers to the family of modem models listed in Table 1.

The modem is the full-featured, self-contained data modem, fax modem, voice/TAM, and speakerphone (optional) solution. These functions, as well as dialing, call progress, telephone line interface and host interface functions are supported and controlled through the command set.

The modem hardware connects to the host PC via a PCI bus interface. The OEM adds a crystal circuit, telephone line interface, telephone interface (optional), and audio interface (optional) to complete the system. Host-Processed Modem Software

The host-processed modem software performs two distinct tasks:

1. General modem control, which includes command sets, fax Class 1, voice/TAM, speakerphone, error correction, data compression, and operating system interface functions.

2. Modem data pump signal processing, which includes data and facsimile modulation and demodulation, as well as voice sample formatting.

Configurations of the modem software are provided to support modem models listed in Table 1. Binary executable modem software is provided for the OEM.

Data/Fax Modes

As a V.90/K56flex data modem, the modem can receive data from a digital source using a V.90- or K56flexcompatible central site modem over the digital telephone network portion of the PSTN at line speeds up to 56 kbps. Asymmetrical data transmission supports sending data up to V.34 rates. This mode can fallback to full-duplex V.34 mode, and to slower rates as dictated by line conditions.

As a V.34 data modem, the modem can operate in 2-wire, full-duplex, asynchronous modes at line rates up to 33.6 kbps. Data modem modes perform complete handshake and data rate negotiations. Using V.34 modulation to optimize modem configuration for line conditions, the modem can connect at the highest data rate that the channel can support from 33600 bps down to 2400 bps with automatic fallback. Automode operation in V.34 is provided in accordance with PN3320 and in V.32 bis in accordance with PN2330. All tone and pattern detection functions required by the applicable ITU or Bell standard are supported.

In fax modem mode, the modem can operate in 2-wire, half-duplex, synchronous modes and can support Group 3 facsimile send and receive speeds of 14400, 12000, 9600, 7200, 4800, or 2400 bps. Fax data transmission and reception performed by the modem are controlled and monitored through the fax EIA/IA-578 Class 1 and T.31 Class 1.0 command interface. Full HDLC formatting, zero insertion/deletion, and CRC generation/checking are provided.

Synchronous Access Mode (SAM) - Video Conferencing

V.80 synchronous access mode between the modem and the host/DTE is provided for host-controlled communication protocols, e.g., H.324 video conferencing applications.

Voice-call-first (VCF) before switching to a videophone call is also supported.

Voice/TAM Mode

Voice/TAM Mode features include 8-bit m-Law, A-Law, and linear coding at 8000 Hz and 7200 Hz sample rates. Tone detection/generation, call discrimination, and concurrent DTMF detection are also supported. ADPCM coding is also supported to meet Microsoft WHQL logo requirements.

Voice/TAM Mode is supported by three submodes:

1. Online Voice Command Mode supports connection to the telephone line or, for SP models, a handset.

2. Voice Receive Mode supports recording voice or audio data input at the RIN pin, typically from the telephone line or, for SP models, a microphone/handset.

3. Voice Transmit Mode supports playback of voice or audio data to the TXA1/TXA2 output, typically to the telephone line or, for SP models, a speaker/handset.

Speakerphone Mode (SP Models)

The SP model includes an additional telephone handset, external microphone, and external speaker interface which supports voice and full-duplex speakerphone (FDSP) operation. The Speakerphone Mode features an advanced proprietary speakerphone algorithm which supports full-duplex voice conversation with acoustic, line, and handset echo cancellation. Parameters are constantly adjusted to maintain stability with automatic fallback from full-duplex to pseudo-duplex operation. The speakerphone algorithm allows position independent placement of microphone and speaker.

The speakerphone mode provides hands-free full-duplex telephone operation under host control. The host can separately control volume, muting, and AGC in microphone and speaker channels.

The speakerphone mode also supports Voice/TAM Mode connection to a handset.