Maxim Integrated 73M2901CE AT Command - Manual (Page 49)

UG_2901CE_027 73M2901CE AT Command User Guide
Rev. 2.0 49
Bit 4 Enables HiZ TXAN/TXAP while looking for CID (only for 2901; no effect for 2909).
Bit 5 Enables RxGain (20 dB) while looking for CID (only for 2901; no effect for 2909).
Bit 6 Enables using USER10 output to signal DAA to activate on-hook LIU-V sensing.
Bit 7 Enables “long space disconnect” option. When enabled, the 73M2901CE sends 3.5 seconds of
space bits (zeros) before disconnecting after receiving an on-hook command from the DTE. When
enabled the 73M2901CE disconnects and goes on-hook upon receiving NULL characters from the
remote modem for 1.5 seconds.
States Idle mode or
AT Command
Processing
other than
ATD ATD
Command
Processing “Wait for Dial
Tone” or “Wait
for Blind Dial”
Delays Pulse
Dialing Tone
Dialing Call
Progress
Phase Connected
Phase
Polling of
Line-in-Use
Signal No Yes Yes No Yes Yes Yes
Action If
LIU Is
Active N/A No seizing
of the phone
line Release of the
line N/A Release of
the line Release
of the line Release of
the line
Returned
Code to
DTE N/A “Line-in-use” “Line-in-use” N/A “Line-in-
use” “Line-in-
use” “Line-in-
use”
4.4.109 S111 – Line-In-Use Settle Time
(Default = 20)
Sets the settling time to wait, after the LIU sensing circuit is enabled, before sampling LIU signal. This is
used for both on-hook(Voltage sensing LIU) and off-hook(PPU) detection. Range is 0 – 254 (X10ms
units).
4.4.110 S112 – Line-In-Use Energy Detection Wait
(Default = 20)
Sets the qualify time that Energy must remain below threshold. Range is 0 – 254 (X100ms units).
4.4.111 S113 – Line-In-Use Energy Detection Threshold
(Default = 15)
Sets the Threshold for the voice Energy. Lower number means Stronger signal strength. The value of 0
would effectively never detect and higher than 95 would always detect. This register is also used by (J7)
test mode as a minimum carrier detect threshold. Range is 0 – 95.
4.4.112 S114(Hi)-S115(Lo) – Maximum Carrier Detect Threshold (J7)
(Defaults: HI = 0, LOW = 50h)
Sets the maximum carrier detect threshold used by (J7) test mode. Higher value may indicate open circuit
in either TXAP or TXAN signals to RXA.