cx20493-35/app Conexant Systems, Inc., cx20493-35/app Datasheet - Page 22

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

2.2
2.3
2.3.1
2.3.2
2.3.3
2.3.4
2.3.5
2.3.6
2-2
CX81801-7x/8x SmartV.XX Modem in 128-Pin LQFP with CX20493 in 32-Pin LQFP Data Sheet
Parallel Host Bus Interface Operation
Establishing Data Modem Connections
Dialing
Telephone Number Directory
Modem Handshaking Protocol
Call Progress Tone Detection
Answer Tone Detection
Ring Detection
Command Mode and Data Mode. The modem can operate at rates up to 230.4 kbps by
programming the Divisor Latch in the parallel interface registers if supported by
communications software and/or driver.
Fax Mode. In V.17 mode, the modem can operate at rates up to 230.4 kbps by
programming the Divisor Latch in the parallel interface registers if supported by
communications software and/or driver.
DTMF Dialing. DTMF dialing using DTMF tone pairs is supported in accordance with
ITU-T Q.23. The transmit tone level complies with Bell Publication 47001.
Pulse Dialing. Pulse dialing is supported in accordance with EIA/TIA-496-A.
Blind Dialing. The modem can blind dial in the absence of a dial tone if enabled by the
X0, X1, or X3 command.
The modem supports four telephone number entries in a directory that can be saved in a
serial EEPROM. Each telephone number can be up to 32 characters (including the
command line terminating carriage return) in length. A telephone number can be saved
using the &Zn=x command, and a saved telephone number can be dialed using the DS=n
command.
If a tone is not detected within the time specified in the S7 register after the last digit is
dialed, the modem aborts the call attempt.
Ringback, equipment busy, congested tone, warble tone, and progress tones can be
detected in accordance with the applicable standard.
Answer tone can be detected over the frequency range of 2100 ± 40 Hz in ITU-T modes
and 2225 ± 40 Hz in Bell modes.
A ring signal can be detected from a TTL-compatible 15.3 Hz to 68 Hz square wave
input.
Conexant
102247B