Maxim Integrated Teridian V.22 bis Linux Softmodem for 73M1822/73M1922 MicroDAA - Manual (Page 51)

UG_1x22_043 V.22 bis Linux Softmodem for 73M1x22 MicroDAA User Guide
Rev. 1.5 51
S61 Signal detect Register 1
 0 See following. Read only.
Bit 0 Reserved
Bit 1
Remote digital loopback detect bit. This bit will be set when a remote digital
loopback request has been detected.
Bit 2
Carrier detect bit. This bit will be set when conditions for V.24 circuit 104 (DCD)
have been met by the modulation mode being used.
Bit 3 Wait for Calling Tone before sending Answer Tone
Bit 4
Energy detect bit. This bit will be set if the receive level is above a certain
threshold.
Bit 5
S1 Detect bit. This will be set if S1 (unscrambled 110011..) is detected. This bit
is also used to detect a retrain request if connected in V.22bis or V.22
Bit 6
USB1 Detect bit. This will be set if USB1 (unscrambled binary ones) is
detected. This bit is also used to detect a remote digital loopback request if
connected in V.22bis or V.22
Bit 7 Reserved
S62 Signal detect Register 2
 0 See following. Read only.
Bit 0 Detected 1650 Hz (V.21 answer marks)
Bit 1 Detected 1300 Hz.
Bit 2 Detected 2100 Hz (ITU answer tone)
Bit 3 reserved
Bit 4 Detected 2225 Hz (Bell answer tone)
Bit 5 Detected 2250 Hz (comp. USB1).
Bit 6
Detected 1100 Hz (fax calling tone). Detect changes to 1270 Hz at the end of
answer Call Progress.
Bit 7
Detected 1300 Hz (data calling tone). Detect changes to 980 Hz at the end of
answer Call Progress.