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RH56D-PCI

Host-Controlled V.90/K56flex™ Modem device Family for Desktop Applications

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RH56D-PCI Modem Designer’s Guide

1.3 TECHNICAL OVERVIEW

1.3.1 General Description

The RH56D-PCI modem provides the processing core for a complete system design featuring data/fax modem, voice/TAM,

and speakerphone support, depending on specific model (Table 1-1).

Note: The term, “RH56D-PCI Device Set”, refers to the family of modem models listed in Table 1-1.

Modem operation, including dialing, call progress, telephone line interface, telephone handset interface, audio interface, and

host interface functions are supported and controlled through the command set.

The modem hardware connects to the host processor via a PCI Bus interface. The OEM adds a crystal circuit, EEPROM,

telephone line interface, telephone handset interface (optional), and audio interface (optional) to complete the system.

1.3.2 Host Modem Software

The host 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 control. Binary executable code controlling MDP operation is downloaded as required during

operation.

Configurations of the modem software are provided to support modem models listed in Table 1-1.

Binary executable modem software is provided for the OEM.

1.3.3 Operating Modes

Data/Fax Modes

As a V.90/K56flex data modem, the modem can receive data from a digital source using a V.90- or K56flex-compatible 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.

Both transmit and receive fax data are buffered within the modem. Data transfer to and from the DTE is flow controlled by

XON/XOFF and RTS/CTS.

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.

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