Specifications

|Modems
20
Applications
USB external modems
Soft Modem-Based Solutions
Conexant’s line of software modem solutions are proven, reliable
products with cumulative shipments exceeding 31 million units
to over 60 countries worldwide. Drawing on Conexant’s modem
technology development, we deliver the latest V.92 features to
enhance the end user’s Internet experience. Extensively tested
in Conexant’s TBR-21-accredited laboratories in France, our PCI,
USB and AC-Link products are backed by the company’s 20-year
history in modem innovations.
HSFi Modem Device
The Conexant CX11252 (HSFi) Host-Processed V.92/V.90 Modem
supports V.92 and V.90 analog data modem operation with V.44
data compression and supports 14.4 KBps fax modem operation.
In addition, the modem supports remote TAM, soft speakerphone
and PCI/Mini Bus interface operation. The modem operates with
PSTN telephone lines in the U.S./Japan/Canada and worldwide.
The CX11252 alone supports an analog interface to an OEM-
provided DAA. This configuration supports data/fax/TAM
and software speakerphone. Discrete input/output lines interface
to off-hook relay control and ring detection circuits. This is the
lowest-cost solution for operation in the U.S./Japan/Canada/China/
South America/CTR21 (TBR21). The countries supported are
defined by the OEM-provided DAA.
Optimized to provide the lowest-cost design in the price-sensitive
modem markets, the CX11252 is ideally suited for host-processed
PCI/Mini PCI Bus-based desktop or mobile applications such as
motherboards, system boards and plug-in cards.
The CX11252 incorporates the following circuits internally to
reduce the application board BOM cost:
• An internal voltage regulator allows operation in +5 V
PCI systems without requiring an external regulator.
• An internal power switching circuit detects and selects
operation from one of three power sources: PCI +5 V,
PCI +3.3 V, or Vaux +3.3, which may be available in
different combinations to a modem from a PC. This
allows a single modem configuration to be used with
different PCI-based PC designs.
• An internal ringwake filter eliminates the need for an
external diode/resistor/capacitor circuit.
The external EEPROM may be removed; contact the local sales
office for possibility.
The CX11252 integrates all digital and analog circuits into a single
Very Large Scale Integration (VLSI) die packaged in a 100-pin
TQFP. Internal digital circuits include PCI Bus interface logic, +5 V
voltage regulator, PCI Bus power switching, ROM, RAM, control
and status registers, general purpose input/output, internal ring-
wake filter, and CODEC interface.
The analog CODEC circuit includes a differential transmit analog
output. Modem datapump and controller functions, traditionally
implemented in dedicated hardware, are processed in a Pentium
MMX-compatible PC using host-signal processing modem software.
Features
• Data Modem
- ITU-T V.92, V.90, K56flex, V.34, V.32 bis, V.32, V.22 bis,
V.22, V.23, and V.21; Bell 212A and Bell 103
- Quick connect
- Modem-on-hold
- V.250 and V.251 commands
• Data compression
- V.44 data compression for optimal downloading
of Internet Web data
- V.42 bis/MNP 5 data compression
- V.42 LAPM/MNP 2 – 4 error correction
• Fax Modem
- V.17, V.29, V.27 ter, and V.21 ch 2
- EIA/TIA 578 Class 1 and T.31 Class 1.0 commands
• Telephony/remote TAM
- V.253 commands
- 8-bit µ-Law/A-Law coding (G.711)
- 8-bit/16-bit linear coding
- 8 KHz sample rate
- Concurrent DTMF detect, ring detect and Caller ID
• V.80 synchronous access mode with H.324
interface support
• V.8/V.8 bis and V.251 commands
• Data/Fax call discrimination
• Internal circuits eliminate external components
- EEPROM
- +5 V to +3.3 V voltage regulator
- PCI +5 V, PCI +3.3 V power switching circuit
- Ringwake eliminating external diode/resistor/
capacitor circuit
Part Number DS56-L510-001/011
Description CNH56D-USB Host-Controlled
USB V.92 Modem Device Set
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