Maxim Integrated 73M2901CE AT Command - Manual (Page 37)

UG_2901CE_027 73M2901CE AT Command User Guide
Rev. 2.0 37
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.22 bis or V.22.
Bit 7 Causes S63 to be sent out USER PORT 2 (available in a special test package only).
4.4.63 S62 – Signal Detect Register 2
(Default = 0)
This is a read only register, and it is only valid in Call Progress.
Bit 0 Detected 1650Hz (V.21 answer marks).
Bit 1 Detected 1300Hz.
Bit 2 Detected 2100Hz (ITU answer tone).
Bit 3 Reserved
Bit 4 Detected 2225Hz (Bell answer tone).
Bit 5 Detected 2250Hz (component of USB1).
Bit 6 Detected 1100Hz (fax calling tone). Detect changes to 1270Hz at the end of answer Call Progress.
Bit 7 Detected 1300Hz (data calling tone). Detect changes to 980Hz at the end of answer Call Progress.
4.4.64 S63 – Precise Call Progress Detect
(Default = 0)
This is a read only register, and it is only valid in Call Progress.
Bit 0 Detected f0 (350Hz).
Bit 1 Detected f1 (440Hz).
Bit 2 Detected f2 (480Hz).
Bit 3 Detected f3 (620Hz).
Bit 4 Detected 2130Hz – CAS Tone component.
Bit 5 Detected 2750Hz – CAS Tone component.
Bit 6 Busy tone detection enabled.
Bit 7 Call Progress filter #1 detect bit.
4.4.65 S64 – Signal Quality
(Default = 0)
This is a read only register that contains the Signal Mean Square Error (MSE) value calculated during
demodulation. Not valid in FSK.