cx20493-35/app Conexant Systems, Inc., cx20493-35/app Datasheet - Page 15

• Manufacturer Part Number: cx20493-35/app
• Description: With Cx20493 Smartdaa?
• Manufacturer: Conexant Systems, Inc.

1.4.3.2
1.4.3.3
102247B
CX81801-7x/8x SmartV.XX Modem in 128-Pin LQFP with CX20493 in 32-Pin LQFP Data Sheet
speeds up to 48 kbps. When PCM upstream is disabled, data transmission supports
sending data at line speeds up to V.34 rates. This mode can fallback to V.34 mode and to
lower rates as dictated by line conditions.
The following modes are supported in V.92 models when connected to a V.92-
compatible server supporting the feature listed.
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•
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In V.34 data modem mode (V.92 and V.34 models), the modem can operate in full-
duplex, asynchronous modes at line rates up to 33.6 kbps. 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 standards are
supported.
In V.32 bis data modem mode, the modem can operate at line speeds up to 14.4 kbps.
In fax modem mode, the modem can operate in half-duplex, synchronous modes and can
support Group 3 facsimile send and receive speeds of 14400, 12000, 9600, 7200, 4800,
and 2400 bps. Fax data transmission and reception performed by the modem are
controlled and monitored through the EIA/TIA-578 Fax Class 1, or T.31 Fax Class 1.0
command interface. Full HDLC formatting, zero insertion/deletion, and CRC
generation/checking are provided.
V.44 Data Compression
V.44 provides efficient data compression that minimizes the download time for the types
of files associated with Internet use. This improvement is most noticeable when browsing
and searching the web since HTML text files are highly compressible. (The improved
performance amount varies both with the actual format and with the content of individual
pages and files.)
Worldwide Operation
SmartDAA technology allows a single PCB design and single BOM to be homologated
worldwide. Advanced features such as extension pickup detection, remote hang-up
detection, line-in-use detection, and digital PBX detection are supported.
Country-dependent modem parameters for functions such as dialing, carrier transmit
level, calling tone, call progress tone detection, answer tone detection, blacklisting, caller
ID, and relay control are programmable.
Country code IDs are defined by ITU-T T.35.
Embedded ROM code includes default profiles for 29 countries. Additional country
profiles can be stored in internal SRAM or external serial EEPROM (request additional
country profiles from a Conexant Sales Office). Duplicate country profiles stored in
internal SRAM or external serial EEPROM will override the profiles in embedded ROM
code. The default countries supported are listed in Table 1-2. Country profiles for
CTR-21 countries are TBR-21 compliant.
Quick connect: Allows quicker subsequent connections to a server by using stored
line parameters obtained during the initial connection.
Modem-on-Hold: Allows detection and reporting of incoming phone calls on the
PSTN with enabled Call Waiting. If the incoming call is accepted by the user, the
user has a pre-defined amount of time of holding the data connection for a brief
conversation. The data connection resumes upon incoming call termination.
PCM upstream: Boosts the upstream data rates. A maximum of 48 kbps is supported
when connected to a V.92 server that supports PCM upstream.
Conexant
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