2.4.10
2.4.11
2.5
2.5.1
2.5.2
2.5.3
102287F
CX86500 SCXV.xx Modem Data Sheet
Call Progress Speaker Interface
A digital speaker output (DSPKOUT) is supported. DSPKOUT is a square wave output
in Data mode used for call progress or carrier monitoring. This output can be optionally
connected to a low-cost on-board speaker, e.g., a sounducer, or to an analog speaker
circuit.
Serial EEPROM Interface
The 38-pin TSSOP supports a 2-line serial interface to an optional serial EEPROM.
The EEPROM can hold information such as firmware customization, and country code
parameters. Data stored in EEPROM takes precedence over the factory default settings.
A serial EEPROM is required only if additional storage is required for more country
profiles or customized firmware code.
The EEPROM size can range from 2 Kb (256 x 8) to 256 Kb (32K x 8). A 2 Kb
EEPROM must be 100 kHz or 400 kHz; higher capacity EEPROMs must be 400 kHz.
V.92 Features
Modem-on-Hold, quick connect, and PCM upstream are only available when connecting
in V.92 data mode. V.92 features are only available when the server called is a V.92
server that supports that particular feature.
Modem-on-Hold
The Modem-on-Hold (MOH) function (V.92 models only) enables the modem to place
an Internet data connection on hold while using the same line to accept an incoming or
place an outgoing voice call. This feature is available only with a connection to a server
supporting MOH. MOH can be executed through either of two methods:
• One method is to enable MOH through the +PMH command. With Call Waiting
Detection (+PCW command) enabled, an incoming call can be detected while on-
line. Using a string of commands, the modem negotiates with the server to place the
data connection on hold while the line is released so that it can be used to conduct a
voice call. Once the voice call is completed, the modem can quickly renegotiate with
the server back to the original data call.
• An alternative method is to use communications software that makes use of the
Conexant Modem-on-Hold drivers. Using this method, the software can detect an
incoming call, place the data connection on hold, and switch back to a data
connection.
Quick Connect
The quick connect function (V.92 models only) enables the modem to shorten the
connect time of subsequent calls to a server supporting quick connect. The quick connect
feature is supported by the +PQC command.
PCM Upstream
PCM upstream boosts the upstream data rates between the user and ISP to reduce upload
times for large files and email attachments. A maximum of 48 kbps upstream rate is
Conexant
2-5