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LSD20463

SmartHCF™ Mobile Modem

Conexant Systems 

SmartHCF Mobile Modem Designer’s Guide

1. INTRODUCTION

1.1 OVERVIEW

The Conexant™ SmartHCF Host-Controlled, V.90/K56flex Modem Device Family with SmartDAA technology supports analog

data up to 56 kbps, analog fax to 14.4 kbps, telephone answering machine (TAM), voice/speakerphone (optional), and PCI

Bus/MiniPCI/CardBus host interface operation. These modem devices meet the size and power requirements of the mobile

environment. The modem operates with PSTN telephone lines in the U.S./Japan/Canada and optionally world-wide. Modem

software is provided. Table 1-1 lists the available models.

Conexant's SmartDAA technology (patent pending) eliminates the need for a costly line transformer, relays, and opto-

isolators typically used in discrete DAA (Data Access Arrangement) implementations. The SmartDAA architecture also

simplifies product implementation by eliminating the need for country-specific board configurations enabling world-wide

homologation of a single modem board design.

The SmartDAA system-powered DAA operates reliably without drawing power from the line, unlike line-powered DAAs which

operate poorly when line current is insufficient due to long lines or poor line conditions. Enhanced features, such as

monitoring of local extension status without going off-hook, are also supported.

Incorporating Conexant’s proprietary Digital Isolation Barrier (DIB) design (patent pending) and other innovative DAA

features, such as Digital PBX line protection and reporting, the SmartDAA architecture simplifies application design,

minimizes layout area, and reduces component cost.

For over a decade, Conexant has assisted customers with DAA technology and homologation. This expertise and system

level approach has been leveraged in this product.

The SmartHCF device set, consisting of a Host Side Device (HSD) in a 100-pin TQFP and a Line Side Device (LSD)

(SmartDAA device) in a 32-pin TQFP, supports data/fax/TAM operation with hardware-based digital signal processing and

DAA/telephone line interface functions (Figure 1-1 ). The optional Voice Codec (VC), in a 32-pin TQFP, supports voice/full-

duplex speakerphone (FDSP) operation with interfaces to a microphone, speaker, and telephone handset/headset. Figure 1-2

identifies the major hardware signal interfaces.

In V.90/K56flex data mode, the modem can receive data at speeds up to 56 kbps from a digitally connected V.90 or K56flex-

compatible central site modem. In this mode, the modem can transmit data at speeds up to V.34 rates.

In V.34 data mode, the modem operates at line speeds up to 33.6 kbps. When applicable, error correction (V.42/MNP 2-4)

and data compression (V.42 bis/MNP 5) maximize data transfer integrity and boost average data throughput. Non-error-

correcting mode is also supported.

Fax Group 3 send and receive rates are supported up to 14.4 kbps with T.30 protocol.

V.80 synchronous access mode supports host-controlled communication protocols, e. g., H.324 video conferencing.

Audio recording and playback over the telephone line interface using A-Law, µ-Law, or linear coding at 8 kHz sample rate

supports applications such as remote digital telephone answering machine (TAM).

This designer's guide describes the modem hardware capabilities and identifies the supporting commands. Commands and

parameters are defined in the Commands Reference Manual (Doc. No. 100498, formerly identified as Doc. No. 1118).

100475A

Conexant

1-1

Conexant Proprietary Information

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