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CX20493 Datasheet(数据表) 25 Page - Conexant Systems, Inc

部件型号  CX20493
说明  SmartV.XX Modem
下载  94 Pages
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制造商  CONEXANT [Conexant Systems, Inc]
网页  http://www.conexant.com
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CX20493 Datasheet(HTML) 25 Page - Conexant Systems, Inc

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CX81801-7x/8x SmartV.XX Modem Data Sheet
102199B
Conexant
2-5
2.4.7
Retrain
The modem may lose synchronization with the received line signal under poor or
changing line conditions. If this occurs, retraining may be initiated to attempt recovery
depending on the type of connection.
The modem initiates a retrain if line quality becomes unacceptable if enabled by the %E
command. The modem continues to retrain until an acceptable connection is achieved, or
until 30 seconds elapse resulting in line disconnect.
2.4.8
Programmable Inactivity Timer
The modem disconnects from the line if data is not sent or received for a specified length
of time. In normal or error-correction mode, this inactivity timer is reset when data is
received from either the DTE or from the line. This timer can be set to a value between 0
and 255 seconds by using register S30. A value of 0 disables the inactivity timer.
2.4.9
DTE Signal Monitoring (Serial DTE Interface Only)
DTR#. When DTR# is asserted, the modem responds in accordance with the &Dn and
&Qn commands.
RTS#. RTS# is used for flow control if enabled by the &K command in normal or error-
correction mode.
2.5
V.92 Features
Modem-on-Hold, quick connect, and PCM upstream are only available in V.92 models
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.
2.5.1
Modem-on-Hold
The Modem-on-Hold (MOH) function enables the modem to place a data call to the
Internet 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 utilizes the Conexant
Modem-on-Hold drivers under Windows PC operating systems. Using this method,
the software can detect an incoming call, place the data connection on hold, and
switch back to a data connection.




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