Product Brief

September 2001

Agere Systems DSP1648C

Host-Based Controller V.92 Modem Chip Set

Features

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Two chip 3.3 V PCI modem solution with

5 V tolerant buffers

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Data mode capabilities:

— ITU-T V.34: 33600 bits/s—2400 bits/s

— V.32bis, and fallbacks

— V.42 and

— V.44, V.42bis and

compression

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FAX mode capabilities:

— ITU-T V.17, V.29, V.27ter, and V.21 Ch 2

— ITU-T T.31 Class 1 FAX

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Compatible with transformer-based and silicon

DAA circuits:

— High-precision sigma-delta codec (CSP1034C)

— Line-powered silicon DAA (CSP1035A)

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Enhanced voice features:

— Full-duplex speakerphone (requires CSP1027

audio codec)

— Telephone answering machine (TAM)

— Caller identification (caller-ID)

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V.80 video-ready interface

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Bit I/Os to support domestic and international

DAAs

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Low power consumption

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Flexible power management modes

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Operating system support:

—

— PC 2001 compliant

Introduction

The DSP1648C, host-accelerated modem chip is an

exciting new upgrade to Agere Systems Inc. line of

host-based controller modems. The DSP1648C

upgrades the technologies found in the DSP1648

V.90 modem solution to the new ITU-T

recommendations V.92 and V.44 communication

industry standards. V.92 and V.44 have four innova-

tive features, designed to improve modem perfor-

mance in the internet environment. The new features

are as follows:

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Modem fast connect: faster start-up times.

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incoming phone call without losing the data

connection.

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PCM upstream: send data to central site at rates

approaching 48 kbits/s.

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Data compression enhancement focused on

todays internet traffic.

The DSP1648C has an integrated PCI interface,

which eliminates the 16550 UART bottleneck found

in traditional hardware modems. The PCI interface

supports both slave and master operations while pro-

viding greater access to host PC system resources.

Host-based controller modems have the benefit of

using powerful CPUs and accessing their plentiful

RAM and disk space. Modem firmware can therefore

be updated in the field since the code simply resides

on the disk.

With this feature set, designers can create full-fea-

tured modem solutions which are characterized by

low-cost, low power consumption, and high-perfor-

mance.

* Due to FCC limitations, speeds of 53 kbits/s are the maximum

permissible transmit power levels during download transmis-

sion. Actual data speeds will vary depending on the line

conditions.

† Modem on hold functionality requires call waiting services.