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DS56-L145-061

SmartSCM Modem

Conexant Systems 

SmartSCM Modem Data Sheet

2.4 Data Mode

Data mode exists when a telephone line connection has been established between modems and all handshaking has been

completed.

Speed Buffering (Normal Mode)

Speed buffering allows a DTE to send data to, and receive data from, a modem at a speed different than the line speed. The

modem supports speed buffering at all line speeds.

Flow Control

DTE-to-Modem Flow Control. If the modem-to-line speed is less than the DTE-to-modem speed, the modem supports

XOFF/XON or RTS/CTS flow control with the DTE to ensure data integrity.

Escape Sequence Detection

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.

BREAK Detection

The modem can detect a BREAK signal from either the DTE or the remote modem. The \Kn command determines the

modem response to a received BREAK signal.

Telephone Line Monitoring

GSTN Cleardown (V.90, K56flex, V.34, V.32 bis, V.32). Upon receiving GSTN Cleardown from the remote modem in a non-

error correcting mode, the modem cleanly terminates the call.

Loss of Carrier (V.22 bis and Below). If carrier is lost for a time greater than specified by the S10 register, the modem

disconnects (except MNP 10).

Receive Space Disconnect (V.22 bis and Below). If selected by the Y1 command in non-error-correction mode, the modem

disconnects after receiving 1.6 ± 10% seconds of continuous SPACE.

Send SPACE on Disconnect (V.22 bis and Below)

If selected by the Y1 command in non-error-correction mode, the modem sends 4 ± 10% seconds of continuous SPACE

when a locally commanded hang-up is issued by the &Dn or H command.

Fall Forward/Fallback (V.90/K56flex/V.34/V.32 bis/V.32)

During initial handshake, the modem will fallback to the optimal line connection within V.90/K56flex/V.34/V.32 bis/V.32 mode

depending upon signal quality if automode is enabled by the +MS or N1 command.

When connected in V.90/K56flex/V.34/V.32 bis/V.32 mode, the modem will fall forward or fallback to the optimal line speed

within the current modulation depending upon signal quality if fall forward/fallback is enabled by the %E2 command.

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.

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.

100490C

Conexant

2-3

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