Maxim Integrated Teridian V.22 bis Linux Softmodem for 73M1822/73M1922 MicroDAA - Manual (Page 11)

UG_1x22_043 V.22 bis Linux Softmodem for 73M1x22 MicroDAA User Guide
Rev. 1.5 11
K DTE-DCE Flow Control

K0 Flow control disabled
K3 RTS/CTS flow control (hardware flow control)
K4 Xon/Xoff control (software flow control)
In Asynchronous mode,
CTS is turned inactive as soon as at least 15 bytes are in the 32
byte transmit buffer. CTS is turned back active when less than 4 bytes are in the buffer.
RTS status is only acknowledged by the TSC Softmodem, thus starting or stopping data
transmission to the DTE, if data are received by the DCE. Receive Data is not buffered by
the TSC Softmodem.
L Fast Connect
 L0 Disable Fast Connect
L1 Disable 2100 Hz answer tone and billing delay
L2 2 second billing delay enabled with no 2100 Hz answer tone
L3 400 ms answer tone and billing delay enabled
N Data Set Ready (
DSR) signal Monitoring
 N0 DSR always ON
N1 DSR is OFF in the idle state and when in a test mode. DSR circuit is turned ON
at start of the handshaking process.
DSR is turned OFF when hang-up process
is started.
N2 DSR is OFF in the idle state and when in a test mode. DSR circuit is turned ON
at the end of handshake after issuing the “CONNECT” result code.
DSR is
turned OFF when hang-up process is started.