ds22-l100-041 Conexant Systems, Inc., ds22-l100-041 Datasheet - Page 20

• Manufacturer Part Number: ds22-l100-041
• Description: Cx84100-41/-23 Scxv.22bis Modem V.22bis Modem With Cx20493 Smartdaa? Line Side Device
• Manufacturer: Conexant Systems, Inc.

2.3.4
2.3.5
2.3.6
2.3.7
2.3.8
2.4
2.4.1
2.4.2
2-4
Escape Sequence Detection
Telephone Line Monitoring
Retrain
Programmable Inactivity Timer
DTE Signal Monitoring (Serial DTE Interface Only)
Error Correction and Data Compression
V.42 Error Correction
MNP 2-4 Error Correction
The +++ escape sequence can be used to return control to the command mode from the
data mode. Escape sequence detection is disabled by an S2 Register value greater than
127.
Loss of Carrier. If carrier is lost for a time greater than specified by the S10 register, the
modem disconnects.
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.
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.
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.
V.42 supports two methods of error correction: LAPM and, as a fallback, MNP 4. The
modem provides a detection and negotiation technique for determining and establishing
the best method of error correction between two modems.
MNP 2-4 is a data link protocol that uses error correction algorithms to ensure data
integrity. Supporting stream mode, the modem sends data frames in varying lengths
depending on the amount of time between characters coming from the DTE.
CX84100-41/-23 SCXV.22bis Modem Data Sheet
Conexant
102339C